July 2012 (PDF, 9.9 MB)

Stantec Consulting Services Inc.3017 Kilgore RoadRancho Cordova CA 95670-6150Tel: (916) 861-0400Fax: (916) 861-0430

July 30, 2012

Mr. Jeff Gymer

Department of Toxic Substances Control

Clovis Field Office

1515 Tollhouse Road

Clovis, California 93611-0522

Reference: Errata Letter

Final Human Health Risk Assessment / Feasibility Study / Removal Action Workplan

Former Lodi Manufactured Gas Plant

712 South Sacramento Street, Lodi, California

Dear Mr. Gymer:

Stantec Consulting Services Inc. (Stantec) has prepared this errata letter to rectify two errors in the Final

Human Health Risk Assessment / Feasibility Study / Removal Action Workplan (July 11, 2012) prepared for

the Pacific Gas and Electric Company Former Lodi Manufactured Gas Plant located at 712 South

Sacramento Street in Lodi, California.

The Department of Toxic Substances Control (DTSC) Responsiveness Summary (presented as

Appendix F) erroneously listed ‘May 20 through June 21, 2011’ as the public comment period for the

draft document and the California Environmental Quality Act (CEQA) Notice of Exemption. The

correct range of dates is May 20 through June 21, 2012. These erroneous dates were subsequently

referenced in the text of the document.

Section 4.1.1 of the document described previous investigations pertaining to the former oil tank, and

referenced Section 2.6 for discussion of soil vapor extraction (SVE) pilot testing. Discussion of the

SVE pilot test is in Section 2.4.

At the request of Mr. Rudy Milan, PG&E project manager, Stantec has included replacement pages with this

errata letter. Please affix the following replacement pages to the appropriate pages in the document, and

place this errata letter before the title page.

• Page E-1 of the executive summary (correction of public comment period).

• Page 4-1 (Section 4.1.1 - corrected reference to SVE pilot test discussion).

• Page 7-1 (Section 7.1 – correction of public comment period).

• Appendix F (first two pages of the DTSC responsiveness summary – correction of public comment

period).

If you have any questions regarding this transmittal, please contact the undersigned at (916) 384-0722.

Sincerely,

STANTEC CONSULTING SERVICES INC.

Neil Doran, P.G.

Senior Geologist

Attachments: Replacement Pages (5)

cc: Rudy Millan, PG&E

Tracy Craig, Craig Communications

Max Reyhani, Tierra Pacific Group Incorporated

Final Human Health Risk Assessment / Feasibility Study / Removal Action Workplan Former Lodi Manufactured Gas Plant

712 South Sacramento Street Lodi, California Stantec PN: 185702232.200.0005

July 11, 2012

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTIONWORKPLANFORMER LODI MANUFACTURED GAS PLANTExecutive Summary

July 11, 2012

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Executive Summary

This Human Health Risk Assessment/Feasibility Study/Removal Action Workplan (HHRA/FS/RAW) has

been prepared for the Pacific Gas and Electric Company (PG&E) site located at 712 South Sacramento

Street in Lodi, California (the site). The objectives of the HHRA/FS/RAW are to establish appropriate

remedial objectives, evaluate remedial alternatives to meet the objectives, and recommend an alternative

for implementation. Site investigation and remediation activities at the site are overseen by the California

Department of Toxic Substance Control (DTSC) under a voluntary cleanup agreement between DTSC

and PG&E executed in October of 2007 (Hazardous Substances Site Cleanup Agreement, Docket No.

HSA-VCA 06/07-182). The public comment period for the draft HHRA/FS/RAW was held from May 20

through June 21, 2012, and the DTSC responsiveness summary is attached.

The 0.73 acre site is a former crude oil manufactured gas plant (MGP) constructed in 1913 by the

Sacramento Natural Gas Company. PG&E assumed possession and operation of the site in 1926, and

gas production operations ceased in 1928. PG&E sold the site in 1958, and re-purchased the site in

2006 for the purpose of environmental investigation and remediation. The site is currently vacant with no

remaining structures associated with historical MGP operations. Surrounding land use is commercial and

residential.

Previous investigations date to the mid-1980s and have documented the presence of MGP-related

chemicals in shallow soils, primarily polycyclic aromatic hydrocarbons (PAHs), petroleum hydrocarbons,

and lead. The majority of impacts are present between the ground surface and 6 feet below ground

surface (ft-bgs). Impacts to shallow soil have been identified beyond the southern property boundary on

property owned by the Lodi Iron Works (LIW), and within South Sacramento Street to the west, primarily

in areas that previously were part of the MGP property prior to the sale to the City of Lodi for street

widening. The vertical and lateral extents of these impacts have been defined. Chemical constituents

detected in groundwater are unrelated to historical MGP operations.

Risk Assessment and Cleanup Goals

The remedial objective is to reduce the concentrations of MGP-related chemicals in site areas (the site,

LIW, and South Sacramento Street), as practicable and feasible, to a point suitable for unrestricted site

use. On behalf of PG&E, a health risk assessment (HRA) was prepared for the site by Iris Environmental.

The HRA determined that none of the chemicals detected in exposed surface soils and soil gas at the site

pose a significant health threat to current off-site residential and commercial populations. Concentrations

of several chemicals in soil require remediation or other forms of risk management in the event that the

site was to be developed in the future for residential use. In the interest of conservative risk-based

decision making, the ‘potential future residential land use’ assumption was extended to the LIW property

and to South Sacramento Street.

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT Executive Summary July 11, 2012

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The HRA derived risk-based and ambient-based screening levels that are protective of human health under site-specific exposure scenarios assuming unrestricted future use. These screening levels were adopted as risk-based cleanup goals. Risk-based and ambient-based cleanup goals are summarized in the following table:

Chemical Cleanup Goal (mg/kg)

Polycyclic Aromatic Hydrocarbons 2-Methylnaphthalene 203 Acenaphthylene 3,270 Benzo (g,h,i) perylene 1,635 Fluoranthene 2,180 Naphthalene 2.1 Pyrene 1,635 Benzo(a)Pyrene Equivalent 0.9

Volatile Organic Compounds Benzene 0.51 Ethylbenzene 5.8

Metals Antimony 30 Cobalt 23 Lead 80 Nickel 1,484 Thallium 5.0

Evaluation and Selection of Remedial Technologies

Stantec evaluated three remedial alternatives: 1) no further action, 2) containment and capping in-place, and 3) excavation of impacted soils with off-site landfill disposal. Each alternative was evaluated with respect to effectiveness, implementability, and cost. Excavation was chosen as the preferred remedial alternative due to that method’s effectiveness in achieving the remedial objective of unrestricted site use.

Proposed Remedial Areas

Three general remedial areas are proposed: 1) the site, 2) the LIW property, and 3) South Sacramento Street. Excavation will be completed to the extent practicable and feasible to achieve numerical cleanup objectives. Excavation within South Sacramento Street, in particular, may be affected by the presence of subsurface utilities.

The Site – Proposed remediation of the site includes site-wide excavation to 3 ft-bgs, and focused excavation in several areas to a maximum depth of 14 ft-bgs.

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT Executive Summary July 11, 2012

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Lodi Iron Works – Proposed remediation of the LIW site consists of excavating an area approximately 15 feet wide, running the length of the property boundary, to 3 ft-bgs, and focused excavation in two areas to 4.5 ft-bgs.

South Sacramento Street – Proposed remediation of South Sacramento Street consists of excavating to the approximate centerline of the street, running the length of the site, to 2 ft-bgs, and focused excavation of four areas to a maximum depth of 8 ft-bgs.

Post-Remediation Data Collection and Risk Assessment

Confirmation soil samples will be collected during excavation to confirm achievement of proposed cleanup goals, and will be used to calculate post-remediation cumulative human health risk. Stantec anticipates collecting post-remediation soil gas data to confirm the absence of potential risk from vapor intrusion. To the extent that practical constraints limit the ability to fully remove impacted soils, as might occur on South Sacramento Street, the post-remediation risk assessment will provide the technical basis for defining the types of risk management measures that should be put in place to ensure long-term protection of human health and the environment.

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT Table of Contents July 11, 2012

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Table of Contents

1.0 INTRODUCTION, SITE BACKGROUND, HISTORY, AND DESCRIPTION ..................... 1-1 1.1 DOCUMENT OBJECTIVES ............................................................................................. 1-1 1.2 DOCUMENT ORGANIZATION ........................................................................................ 1-1 1.3 SITE DESCRIPTION, BACKGROUND AND HISTORY ................................................... 1-2 1.4 PHYSICAL CHARACTERISTICS ..................................................................................... 1-3

1.4.1 Surface Features ............................................................................................... 1-3 1.4.2 Surface Water ................................................................................................... 1-3 1.4.3 Regional Geology and Hydrogeology ................................................................ 1-3 1.4.4 Site Geology and Hydrogeology ........................................................................ 1-4 1.4.5 Ecologic and Biologic Resources ...................................................................... 1-4 1.4.6 Cultural Resources ............................................................................................ 1-5

2.0 SUMMARY OF PREVIOUS INVESTIGATIONS .............................................................. 2-1 2.1 EARLY INVESTIGATIONS .............................................................................................. 2-1 2.2 REMEDIAL INVESTIGATION ACTIVITIES – 2008 TO 2009 ............................................ 2-1 2.3 POST-REMEDIAL INVESTIGATION SITE CHARACTERIZATION .................................. 2-2 2.4 SOIL VAPOR EXTRACTION PILOT TESTING ................................................................ 2-3

3.0 REMEDIAL OBJECTIVES AND CLEANUP GOALS ....................................................... 3-1 3.1 REMEDIAL OBJECTIVES ................................................................................................ 3-1 3.2 REGULATORY REQUIREMENTS ................................................................................... 3-1 3.3 HUMAN HEALTH RISK ASSESSMENT .......................................................................... 3-1

3.3.1 Identification of Chemicals of Potential Concern ................................................ 3-1 3.3.2 Exposure Assessment ....................................................................................... 3-2 3.3.3 Risk Characterization Results ............................................................................ 3-2

3.4 PROPOSED SOIL CLEANUP GOALS ............................................................................. 3-3 3.4.1 PAHs ................................................................................................................. 3-3 3.4.2 VOCs ................................................................................................................ 3-4 3.4.3 Metals ............................................................................................................... 3-4

4.0 NATURE AND EXTENT OF CONTAMINATION ............................................................. 4-1 4.1 SOIL .......................................................................................................................... 4-1

4.1.1 Former Oil Tank ................................................................................................ 4-1 4.1.2 Former Oil Supply Line ...................................................................................... 4-2 4.1.3 Former Lampblack Separators .......................................................................... 4-2 4.1.4 Former Storage Holder #3 ................................................................................. 4-2

4.2 SOIL GAS ........................................................................................................................ 4-2 4.3 LIW SITE ......................................................................................................................... 4-3 4.4 SOUTH SACRAMENTO STREET ................................................................................... 4-3


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Table of Contents - continued

5.0 EVALUATION AND SELECTION OF REMEDIAL TECHNOLOGIES ............................. 5-1 5.1 POTENTIAL REMEDIAL ACTIONS ................................................................................. 5-1 5.2 REMEDY EVALUATION AND SELECTION ..................................................................... 5-2

5.2.1 Effectiveness ..................................................................................................... 5-2 5.2.2 Implementability ................................................................................................ 5-2 5.2.3 Cost ................................................................................................................... 5-3

5.3 SELECTION OF REMEDIAL ALTERNATIVE ................................................................... 5-4

6.0 PROPOSED REMEDIAL AREAS .................................................................................... 6-1 6.1 ON-SITE REMEDIATION ................................................................................................. 6-1 6.2 OFF-SITE REMEDIATION – SOUTH SACRAMENTO STREET ...................................... 6-2 6.3 OFF-SITE REMEDIATION – LIW ..................................................................................... 6-2

7.0 REMOVAL ACTION IMPLEMENTATION ........................................................................ 7-1 7.1 PUBLIC PARTICIPATION ................................................................................................ 7-1 7.2 SITE MANAGEMENT ...................................................................................................... 7-1

7.2.1 Site Access ....................................................................................................... 7-1 7.2.2 Site Security ...................................................................................................... 7-2 7.2.3 Traffic Control .................................................................................................... 7-2

7.3 REMEDIATION IMPLEMENTATION ................................................................................ 7-2 7.3.1 Pre-construction ................................................................................................ 7-2 7.3.2 Site Preparation................................................................................................. 7-3 7.3.3 Site Demolition .................................................................................................. 7-4 7.3.4 Excavation ......................................................................................................... 7-4 7.3.5 Backfill and Compaction .................................................................................... 7-5 7.3.6 Site Restoration ................................................................................................. 7-5

7.4 MONITORING AND CONTROL ....................................................................................... 7-6 7.4.1 Noise ................................................................................................................. 7-6 7.4.2 Air ..................................................................................................................... 7-6 7.4.3 Odor .................................................................................................................. 7-7

7.5 STORMWATER MANAGEMENT ..................................................................................... 7-7 7.6 WASTE TRANSPORTATION AND DISPOSAL ............................................................... 7-8

7.6.1 Characteristics and Destination of Soils ............................................................ 7-8 7.6.2 Truck Transportation ......................................................................................... 7-8 7.6.3 Site Traffic Control ............................................................................................. 7-9 7.6.4 Record Keeping............................................................................................... 7-10

7.7 POST-REMEDIATION SITE EVALUATION AND RISK ASSESSMENT ........................ 7-11 7.8 SCHEDULE ................................................................................................................... 7-11


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Table of Contents - continued

8.0 SAMPLING AND ANALYSIS PLAN ................................................................................ 8-1 8.1 CONFIRMATION SAMPLING LOCATIONS ..................................................................... 8-1

8.1.1 On-site Remedial Areas .................................................................................... 8-1 8.1.2 Off-site Remedial Areas – South Sacramento Street ......................................... 8-2 8.1.3 Off-site Remedial Areas – LIW .......................................................................... 8-2

8.2 SAMPLE COLLECTION AND ANALYSIS ........................................................................ 8-3 8.2.1 Sampling Equipment ......................................................................................... 8-3 8.2.2 Equipment Decontamination ............................................................................. 8-3 8.2.3 Sample Handling ............................................................................................... 8-3 8.2.4 Analytical Parameters ....................................................................................... 8-3 8.2.5 Data Evaluation ................................................................................................. 8-4

8.3 WASTE DISPOSAL CLASSIFICATION SAMPLING ........................................................ 8-4

9.0 QUALITY ASSURANCE PLAN ....................................................................................... 9-1 9.1 PROJECT ORGANIZATION AND RESPONSIBILITIES .................................................. 9-1

9.1.1 Project Manager ................................................................................................ 9-1 9.1.2 QA Director ....................................................................................................... 9-1 9.1.3 Health and Safety Officer .................................................................................. 9-1 9.1.4 Field Geologist/Field Supervisor ........................................................................ 9-2

9.2 CALIBRATION OF FIELD EQUIPMENT .......................................................................... 9-2 9.3 SAMPLE HANDLING AND FIELD DOCUMENTATION ................................................... 9-2

9.3.1 Sample Containers ............................................................................................ 9-3 9.3.2 Field Documentation ......................................................................................... 9-3 9.3.3 Sample Chain-of-Custody Record ..................................................................... 9-3 9.3.4 Sample Labels .................................................................................................. 9-4 9.3.5 Sample Collection Log....................................................................................... 9-4

9.4 FIELD QUALITY CONTROL SAMPLES ........................................................................... 9-4 9.4.1 Blind Duplicate Samples .................................................................................... 9-4 9.4.2 Equipment Blanks ............................................................................................. 9-5

9.5 LABORATORY QUALITY CONTROL SAMPLES............................................................. 9-5 9.5.1 Matrix Spike/Matrix Spike Duplicates ................................................................. 9-5 9.5.2 Surrogate Spiking .............................................................................................. 9-5

9.6 DATA REDUCTION, VALIDATION AND REPORTING .................................................... 9-5 9.6.1 Corrective Action ............................................................................................... 9-5 9.6.2 Quality Assurance Reports ................................................................................ 9-6

10.0 HEALTH AND SAFETY PLAN ...................................................................................... 10-1

11.0 REFERENCES .............................................................................................................. 11-1

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT List of Attachments July 11, 2012

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List of Attachments

LIST OF FIGURES

Figure 1 – Site Location Map Figure 2 – Site Plan Figure 3 – Proposed Remedial Excavation – On-site Areas Figure 4 – Proposed Remedial Excavation – South Sacramento Street Figure 5 – Proposed Remedial Excavation – Lodi Iron Works Figure 6 – Proposed Truck Route from Site to HWY 99 Note: Figures appear at end of report.

LIST OF APPENDICES

Appendix A – Historical Soil, Groundwater, and Soil Gas Chemical Data Appendix B – Applicable or Relevant and Appropriate Requirements Appendix C – Administrative Record List Appendix D – Human Health Risk Assessment (Iris Environmental) – submitted electronically (refer to CD) Appendix E – Extent of Soil Chemical Impacts Above Cleanup Goals Appendix F – DTSC Responsiveness Summary and CEQA Notice of Exemption

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT List of Acronyms July 11, 2012

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List of Acronyms

ABSL ambient-based screening levels amsl above mean sea level ASTM American Society for Testing and Materials BaPe Benzo(a)Pyrene Equivalent BTEX benzene, toluene, ethylbenzene and xylenes Cal-EPA California Environmental Protection Agency CCTC Central California Traction Company CEQA California Environmental Quality Act COPC chemical of potential concern COC chemical of concern CPAH carcinogenic polycyclic aromatic hydrocarbon DTSC Department of Toxic Substances Control ECR excess cancer risk ESL Environmental Screening Level FS Feasibility Study ft-bgs feet below ground surface GANDA Garcia and Associates HASP health and safety plan HERD Human and Ecological Risk Division HI hazard index HRA health risk assessment HHRA Human Health Risk Assessment LIW Lodi Iron Works mg/kg milligrams per kilogram MGP manufactured gas plant mph miles per hour MS/MSDs matrix spike/matrix spike duplicates MTBE methyl tertiary-butyl ether NFA No Further Action NPDES National Pollutant Discharge Elimination System OSHA Occupational Safety and Health Administration PAHs polycyclic aromatic hydrocarbons PCB polychlorinated biphenyl PCE tetrachloroethene PID photoionization detector PPE personal protective equipment PVC polyvinyl chloride QA/QC quality assurance/quality control

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT List of Acronyms July 11, 2012

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List of Acronyms

QAP Quality Assurance Plan RAW Removal Action Workplan RBSL risk-based screening level RCRA Resource Conservation and Recovery Act RWQCB Regional Water Quality Control Board SVE soil vapor extraction SWRCB State Water Resources Control Board TCE trichloroethene US EPA United States Environmental Protection Agency VOC volatile organic compound

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT Introduction, Site Background, History, and Description July 11, 2012

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1.0 Introduction, Site Background, History, and Description

Stantec Consulting Corporation (Stantec) has prepared this Human Health Risk Assessment/Feasibility Study/Removal Action Workplan (HHRA/FS/RAW) on behalf of Pacific Gas and Electric Company (PG&E) for the former Lodi Manufactured Gas Plant located at 712 South Sacramento Street in Lodi, California (the site). Investigation and remediation activities at the site are overseen by the California Department of Toxic Substances Control (DTSC) under a voluntary cleanup agreement between DTSC and PG&E executed in October of 2007 (Hazardous Substances Site Cleanup Agreement, Docket No. HSA-VCA 06/07-182).

1.1 DOCUMENT OBJECTIVES

The primary purposes of the HHRA/FS/RAW are to establish appropriate remedial objectives, evaluate remedial alternatives to meet the objectives, and recommend an alternative for implementation. A brief description of the recommended alternative is included herein.

1.2 DOCUMENT ORGANIZATION

This document is organized as follows:

Section 1.0 – Introduction, Site Background, History, and Description – Presents an introduction to the HHRA/FS/RAW, describes the site, and summarizes the site history.

Section 2.0 – Summary of Previous Investigations – Summarizes environmental investigations at the site completed to date.

Section 3.0 – Remedial Objectives and Cleanup Goals – Presents remedial action objectives, findings of the human health risk assessment, and proposed soil cleanup goals.

Section 4.0 - Nature and Extent of Contamination – Describes the nature and extent of contamination to environmental media (soil, groundwater, and soil vapor) from chemicals of concern;

Section 5.0 – Evaluation and Selection of Remedial Technologies – Describes potential remedial actions, provides comparative analysis for each alternative in consideration of three criteria (effectiveness, implementability, and cost), and identifies the selected remedial technology.

Section 6.0 – Proposed Remedial Areas – Summarizes remedial areas associated with the site.

Section 7.0 – Removal Action Implementation – Describes implementation of the selected remedial alternative.



Section 8.0 – Sampling and Analysis Plan – Presents the sampling and analysis plan to ensure that the chosen remedial alternative achieves cleanup goals.

Section 9.0 – Quality Assurance Plan – Describes measures for achieving data quality objectives.

Section 10.0 – Health and Safety Plan – Summarizes elements of the site-specific health and safety plan (HASP) to be used during implementation of the chosen remedial alternative.

Section 11.0 – References – Summarizes technical documents referenced in the HHRA/FS/RAW.

1.3 SITE DESCRIPTION, BACKGROUND AND HISTORY

The site, consisting of approximately 0.73 acre, was formerly a crude oil manufactured gas plant (MGP). The site was constructed in 1913 by the Sacramento Natural Gas Company, located along the west side of the Southern Pacific Railroad line and in the southeast corner of the intersection of South Sacramento Street and Spruce Street in Lodi, California (see Figure 1; Site Location Map). Site activities and transfers of ownership are summarized by the following timeline:

1926: PG&E took over operation of the gas plant and possession of the property, consisting of historical Parcels A and B (see Figure 2). Parcel A was a 25-foot wide strip along the west side of the current property which was later used by the City of Lodi for widening and improvement of South Sacramento Street. The historical dimensions of Parcel B correspond with the current Site dimensions.

1928: PG&E completed the construction of a high pressure gas pipeline into Lodi, and the gas

plant was shut down.

1931 to 1956: The generator and boiler buildings were demolished in 1931, and the gas storage holders were removed in 1934 and 1956.

1958: PG&E sold Parcel A to the City of Lodi and Parcel B to the Central California Traction

Company.

1970s: The site, in its current configuration consisting only of historical Parcel B, was used for warehousing by the California Fruit Exchange.

1988: The Central California Traction Company (CCTC) sold the Site to the Reynolds Packing

Company.

1992: The Reynolds Packing Company sold the Site back to CCTC.



2006: PG&E purchased the Site from CCTC for the purpose of environmental investigation and remediation.

1.4 PHYSICAL CHARACTERISTICS

The site is a vacant lot located at approximately 47 feet above mean sea level (amsl). The general topographic grade in the vicinity of the site is to the west-southwest, and surface topography at the site is flat. The site is bounded on the west by South Sacramento Street and on the east by Union Pacific Railroad tracks. The property immediately north of the site is occupied by Jorge’s Auto Body, an automobile repair facility, and the property immediately south of the site is a vacant lot owned by Lodi Iron Works (LIW), a metalworking concern. Immediately across Sacramento Street to the west is residential housing. The site is surrounded by a chain-link fence topped with barbed wire, and access to the site is through two gates facing South Sacramento Street. The site and adjacent areas to the north, east, and south are zoned as heavy industrial. The site is currently classified by the City of Lodi as vacant industrial land, developed. The properties west of the site, across South Sacramento Street, are zoned as single-family residential, high-density residential and garden apartments.

1.4.1 Surface Features

Approximately 25 percent of the site is surfaced with degraded asphalt or concrete pads associated with historical site features, and the remainder of the site consists of a dirt surface. The concrete footing corresponding to the former general shop and storeroom (MGP meter house), and partial concrete footings corresponding to the former relief holder #1 and automobile garage are still in place. Historical site features are illustrated on Figure 2. Two trees of unknown variety exist at the site and vegetation exists along sections of the northern and eastern site boundaries.

1.4.2 Surface Water

No surface water bodies exist at the site or in the immediate vicinity of the site. The closest surface water body is an irrigation canal located approximately 1.4 miles west of the Site. The canal originates from the Lodi Lake section of the Mokelumne River, located approximately 1.6 miles north of the site.

1.4.3 Regional Geology and Hydrogeology

The City of Lodi is part of the Eastern San Joaquin Groundwater Basin, within the Central Valley geomorphic province. Lodi is underlain by alluvial soils of the Modesto Formation (Quaternary) eroded from surrounding mountain ranges. The alluvial layers are part of the major aquifer system that runs the length of the valley. The aquifer is recharged by the Mokelumne River which borders the City of Lodi to the north. Groundwater in the City of Lodi ranges from 20 feet below ground surface (ft-bgs) in the



northwest to 60 ft-bgs in the south (City of Lodi, 2006). Groundwater in the vicinity generally flows towards the south (City of Lodi Water Pollution Control Facility, 2006). Investigations at the site (see Section 1.4.4) identified first-groundwater at approximately 65 ft-bgs. The site is located within the Lodi groundwater investigation area. An investigation of tetrachloroethene (PCE) and trichloroethene (TCE) impacted soil and groundwater has been ongoing throughout northeast and central Lodi since 1989, when the contaminants were first detected in city water supply wells. These contaminants were released primarily from dry cleaning operations, including facilities approximately 3,000 feet north-northwest of the site. The site is located within the southern distal end of the groundwater PCE plume, approximately 600 feet southwest of Lodi well MW-24A and approximately 1,000 feet north-northwest of Lodi well MW-21A. Hydrogeologic information for the area and the site is based on the document entitled, “Report of Third Quarter 2007 Groundwater Monitoring, Central Plume Area, Lodi, California,” (Third Quarter 2007 Report) provided by the California Regional Water Quality Control Board (RWQCB) for the Lodi Central Plume Area (Treadwell and Rollo, 2008). Based on the data provided in the report, the upper groundwater zone in the general area of the site is approximately 60 ft-bgs with groundwater flow to the south with a gradient of approximately 0.003 feet per feet.

1.4.4 Site Geology and Hydrogeology

Investigations performed to date have included soil borings advanced to first-encountered groundwater at approximately 65 ft-bgs. Encountered soils consist primarily of dark yellow to dark brown sand and silty sand, grading to sandy silt, and clay at various depths and locations. Sand is typically fine-grained with localized occurrences of coarser sand- to gravel-sized material. Significant deposits of sandy clay (greater than 5 feet thick) were encountered at various locations.

1.4.5 Ecologic and Biologic Resources

The site is located in an industrialized area of Lodi, is surrounded by a chain-link fence, and bordered on one side by an active rail line. Therefore, the site is not expected to offer significant habitat for terrestrial biota, such as foraging, grazing, or nesting opportunities. The site is located in an active urban area with commercial and industrial operations on adjoining properties, including the active rail line. Due to the nature of this environmental setting, there is minimal open vegetated space; the site is surrounded by developed properties and paved roads. There are no viable terrestrial habitats present to attract wildlife in which the wildlife might forage or reside at the site or in the immediate vicinity.



1.4.6 Cultural Resources

No significant cultural resources are known to be associated with the site. A cultural resource evaluation conducted in 2007 concluded that the site’s general shop and store room (the former MGP meter house) was not historically significant as assessed under the California Environmental Quality Act (CEQA) guidelines. The former meter house was subsequently demolished in April 2008.

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT Summary of Previous Investigations July 11, 2012


2.0 Summary of Previous Investigations

The following sections summarize historical investigation activities at the site. The investigations, including methods and findings, are detailed in the Remedial Investigation Completion Report (Stantec, 2010a).

2.1 EARLY INVESTIGATIONS

Ten surface soil samples were collected during two phases of investigation in the mid-1980s and 2006. Elevated concentrations of PAHs, metals, and petroleum hydrocarbons were reported; and benzene, toluene, ethylbenzene and xylenes (BTEX), volatile organic compounds (VOCs), organochlorides, polychlorinated biphenyls (PCBs), or herbicides were not detected above laboratory reporting limits. In September 2007, Garcia and Associates (GANDA) prepared a cultural resources report entitled, “Historical Resources Evaluation Report for the Pacific Gas and Electric Lodi Former Manufactured Gas Plant General Shop and Storeroom/Meter House Building,” (GANDA, 2007). The report concluded that the site’s general shop and store room (the former MGP meter house) was not historically significant as assessed under the CEQA guidelines. The former meter house was demolished in April 2008.

2.2 REMEDIAL INVESTIGATION ACTIVITIES – 2008 TO 2009

Several phases of remedial investigation activities were conducted in 2008 and 2009, and presented in the document entitled, “Remedial Investigation Completion Report,” dated June 8, 2010. Historical sample locations are illustrated on Figure 2. Investigation activities consisted of geophysical investigation, direct-push soil borings for collection of soil samples, passive and active soil gas sampling, and collection of four grab groundwater samples. In addition, two former MGP-era water supply wells were abandoned. Key findings of the remedial investigation are summarized below:

Chemical impacts from PAHs, petroleum hydrocarbons, and lead were widespread in soils between the ground surface and approximately 5 ft-bgs, and a small area of benzene-impacted soils was identified between the ground surface and approximately 12 ft-bgs within a former redwood oil tank that had been buried in-place.

MGP waste residue (lampblack) was observed in soils within the former redwood oil tank, beneath and in the immediate vicinity of the lampblack separators, and beneath the former gas storage holder #3. The occurrence of lampblack was generally limited in vertical and lateral extent.



Concentrations of volatile constituents in soil gas are unlikely to pose a vapor intrusion risk under the current site conditions, because the site is currently vacant undeveloped land, no detected compounds exceeded residential screening levels, and the nearest resident is located across South Sacramento Street to the west. Elevated reporting limits for naphthalene in four samples warranted additional risk evaluation.

The former redwood oil storage tank was abandoned in-place, and impacted soils have been

observed within the fill material inside the former tank and beneath the tank to a depth of approximately 21 ft-bgs in the immediate vicinity of the former tank. Evidence of chemical impact was not observed in soils beneath the tank between 21 ft-bgs and first-encountered groundwater at 65 ft-bgs, indicating no potential threat to groundwater.

Investigation of a former oil conveyance pipeline indicated the pipeline may still be in-place, and

chemical impacts to soils were identified to 12 ft-bgs at several locations along the pipeline.

Low concentrations of petroleum hydrocarbons consistent with a weathered fuel product were detected in groundwater beneath the site. Based on the chemical composition of constituents in groundwater, the significant vertical separation between impacted soils and first-encountered groundwater (greater than 40 feet), and the low migration potential of MGP-related constituents, these detections appear to be unrelated to historical site operations and warrant no further investigation. Groundwater sampling in the vicinity of the former MGP water supply wells confirms the wells did not act as pathways for migration of contaminants to groundwater.

Off-site investigations suggest chemical impacts attributable to the site extend a short distance

into the adjacent South Sacramento Street to the west, a portion of which was part of the historic MGP property, and across the southern property boundary on to the LIW property.

2.3 POST-REMEDIAL INVESTIGATION SITE CHARACTERIZATION

Following completion of the remedial investigation, PG&E elected to perform additional remedial refinement investigations at the site in July and September 2010. July 2010 investigation activities were described in the document entitled, “Revised Remedial Refinement Work Plan,” dated June 11, 2010 (Stantec, 2010b), and approved by the DTSC in electronic correspondence dated June 22, 2010. The work consisted of additional on-site soil characterization using test pits and soil borings, and additional investigation of soil conditions beneath South Sacramento Street, including investigation of historical gas distribution lines entering South Sacramento Street from the northwest corner of the site. Based on the findings of the July 2010 remedial refinement sampling, additional investigation activities were completed in September 2010, and consisted of soil boring advanced on-site and within South Sacramento Street. Soil chemical data collected in July and September 2010 are presented with historical data in Appendix A.



Key findings of the remedial refinement investigations are summarized below:

Soil sampling along the northern property boundary revealed the presence of lampblack at one location, and elevated concentrations of PAHs and petroleum hydrocarbons in shallow soils, consistent with conditions elsewhere across the site. Concentrations of PAHs attenuate to below residential screening levels in soil samples collected within approximately 5 feet of the northern property line.

Soil borings advanced in the vicinity of the former oil tank encountered elevated concentrations of petroleum hydrocarbons in sandy soils at approximately 20 ft-bgs, suggesting contamination originating at the former oil tank has migrated laterally within permeable soils. However, concentrations of BTEX and PAHs were below screening levels in these samples.

The former oil supply pipeline, historically used to deliver fuel stock between rail cars and the oil tank, was found to be in-place and intact for a length of approximately 40 feet extending from the eastern fence line. The conduit was observed to be approximately 4-inch-diameter cast iron, located at a depth of approximately 1 ft-bgs. Visual evidence of chemical impact was not observed in soils immediately beneath the pipe, and samples were collected from beneath the line at locations approximately 27 and 40 feet from the fence line. Soil chemical data from these samples do not contain chemical constituents at concentrations above screening levels.

Two historical gas distribution lines entering South Sacramento Street from the former meter house were investigated using an air knife. The lines, consisting of approximately 10-inch-diameter steel, extend approximately 12 feet into South Sacramento Street, and the top of the pipes are located at approximately 2 ft-bgs. Soil samples collected from multiple depths below the pipes did not contain chemical constituents at concentrations above screening levels.

2.4 SOIL VAPOR EXTRACTION PILOT TESTING

Stantec conducted a soil vapor extraction (SVE) pilot test at the site in September and October 2010. The objective of the SVE test was to evaluate the feasibility of using SVE to reduce concentrations of VOCs in soil prior to excavation of the former oil tank and surrounding soils. The pilot test consisted of installing one 6-inch-diameter polyvinyl chloride (PVC) SVE test well within the former oil tank (at the approximate location of SB-6) and six ¾-inch-diameter PVC observation wells at locations surrounding the former tank. Results of the SVE pilot test were presented to the DTSC in the document entitled, “Results of Soil Vapor Extraction Pilot Testing,” dated October 29, 2010 (Stantec, 2010c).

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3.0 Remedial Objectives and Cleanup Goals

The following sections discuss remedial objectives and derivation of cleanup goals.

3.1 REMEDIAL OBJECTIVES

The remedial objective is to reduce the concentrations of MGP-related chemicals in soil and soil vapor in all areas (the site, LIW, and South Sacramento Street) to a point suitable for unrestricted use. This objective will be achieved in all areas to the extent practicable and feasible given the physical and/or logistical constraints associated with remediation such as buried utilities in public rights of way.

3.2 REGULATORY REQUIREMENTS

Applicable or potentially applicable chemical-, action-, and location-specific requirements are summarized in Appendix B. An Administrative Record List identifying documents that were relied upon or considered when selecting the remedial action for the site is included as Appendix C.

3.3 HUMAN HEALTH RISK ASSESSMENT

On behalf of PG&E, a health risk assessment (HRA) was prepared for the site by Iris Environmental (Iris). The results of the HRA have been used to identify areas of the site where remediation, or other forms of risk management, may be appropriate, with the overall goal of long-term protection of human health and the environment. The document entitled, “Draft Final Human Health Risk Assessment, Former Lodi Manufactured Gas Plant, 712 South Sacramento Street, Lodi, California,” (Iris Environmental, 2011) is provided as Appendix D. The HRA was conducted in accordance with applicable United States Environmental Protection Agency (US EPA) and California Environmental Protection Agency (Cal-EPA) risk assessment guidance. The following sections summarize the findings and conclusions from the HRA conducted for the site.

3.3.1 Identification of Chemicals of Potential Concern

Previous site investigation data collected between mid-1980s and 2010 (see Section 2.0) were evaluated for use in the quantitative HRA. Chemicals that were detected above background/ambient levels in soil and all chemicals detected in soil gas were included as chemicals of potential concern (COPCs) in the quantitative analysis. Chemicals detected in soils that are included as COPCs in the quantitative HRA are as follows: various VOCs (including BTEX); various PAHs; and various inorganics. As discussed in the HRA, human health risk associated with petroleum hydrocarbons is assessed by evaluating the risk posed by specific



components in TPH (i.e., PAHs and BTEX). A complete list of chemicals included in the HRA is presented in Tables 1 and 2 of Appendix D. Chemicals detected in soil gas that are included as COPCs in the quantitative HRA are as follows:

1,1-difluoroethane 1,2,4-trimethylbenzene 1,3,5-trimethylbenzene 2-butanone (MEK) 2-hexanone 4-ethyltoluene Acetone Benzene Carbon disulfide Isopropylbenzene (cumene) Ethanol Dichlorodifluoromethane (Freon 12)

Ethylbenzene Heptane Methyl tertiary-butyl ether (MTBE) Naphthalene Propylbenzene Styrene Tetrachloroethene (PCE) Toluene Trichlorofluoromethane (Freon 11) Trichloroethene (TCE) Total xylenes

These chemicals are summarized in Table 3 of Appendix D.

3.3.2 Exposure Assessment

Under current conditions, the majority of the surface of the site is unpaved, and the primary pathway through which current off-site residents and off-site commercial workers could potentially be exposed to COPCs in soil or soil gas includes the inhalation of volatile constituents that have migrated up through the soil column into the ambient air and through the inhalation of fugitive dusts from the exposed soils at the site. In the future, it is possible that the site could be redeveloped for residential purposes and direct exposure to the COPCs in the surface and subsurface soils could occur. Thus, future on-site residents are assumed to be exposed to COPC in soil across the site through direct contact (i.e., soil ingestion, dermal contact with soil), as well as through the inhalation of particulates/vapors that could be present in the indoor/ambient air.

3.3.3 Risk Characterization Results

With respect to current exposures, the HRA concludes that none of the chemicals detected in exposed surface soils and soil gas at the site pose a significant health risk to current off-site residential and commercial populations. With respect to future site use, the HRA concludes that levels of carcinogenic polycyclic aromatic hydrocarbon (CPAHs), naphthalene, pyrene, cobalt, benzene, fluoranthene, and lead present in soils on the site would require some remediation or other form of risk management (e.g.,



institutional controls) in the event that the site were to be developed in the future for residential purposes. This conclusion extends to site-related impacts observed at LIW and within South Sacramento Street. Results of the HRA indicate that the estimated health risks associated with COPCs in soil gas via vapor intrusion for future on-site residential populations are at or below acceptable levels (i.e., incremental cancer risks are equivalent to or below the lower end of the acceptable risk range of 1 x 10-6 to 1 x 10-4 and the noncancer HIs are below 1). Estimated health risks are based on existing soil gas data collected during the RI. Soil sampling results have indicated areas of elevated benzene and/or naphthalene concentrations in soils (i.e., at SB-6 and SB-49) where no soil gas data was collected, and these areas are addressed in the in the FS/RAW sections of this document.

3.4 PROPOSED SOIL CLEANUP GOALS

The HRA included as Appendix D derives risk-based screening levels (RBSLs) and ambient-based screening levels (ABSLs) that are protective of human health under site-specific exposure scenarios given unrestricted future residential site use. These screening levels will be used as proposed cleanup goals for soil. The following sections summarize compounds which currently exceed cleanup goals, and the corresponding cleanup goal for that compound. The complete list of RBSLs and ABSLs for all compounds historically detected at the site is included as Table 24 in Appendix D.

3.4.1 PAHs

The proposed soil cleanup goal for Benzo(a)Pyrene Equivalent (BaPe) corresponds to the 95th percentile of in the ambient data set for northern California. Risk-based cleanup goals have been established for the non-carcinogenic PAHs and for naphthalene, as summarized in the following table:

Chemical Cleanup Goal (mg/kg) 2-Methylnaphthalene 203 Acenaphthylene 3,270 Benzo (g,h,i) perylene 1,635 Fluoranthene 2,180 Naphthalene 2.1 Pyrene 1,635 Benzo(a)Pyrene Equivalent 1 0.9 1

_____________ mg/kg = milligrams per kilogram Note: 1 – Ambient-based cleanup goal for carcinogenic PAHs calculated as BaPe.



3.4.2 VOCs

Risk-based cleanup goals for VOCs are summarized below:

Chemical Risk-Based Cleanup Goal (mg/kg) Benzene 0.51 Ethylbenzene 5.8

3.4.3 Metals

Risk-based cleanup goals for metals are summarized below:

Chemical Risk-Based Cleanup Goal (mg/kg) Antimony 30 Cobalt 23 Lead 80 Nickel 1,484 Thallium 5.0

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4.0 Nature and Extent of Contamination

The following sections describe the extent of chemical impacts to soil originating from historical MGP

operations. Areas of impact are divided into three regions: 1) on-site, 2) LIW property to the south, and 3)

South Sacramento Street to the west. Chemical impacts to soil gas are also summarized in the following

sections, and historical soil and soil gas chemical data are included as Appendix A. As documented in

the RI Completion Report, impacts to groundwater beneath the site appear to be unrelated to historical

MGP operations.

4.1 SOIL

Concentrations of BaPe, naphthalene, petroleum hydrocarbons, and to a lesser extent lead, are

widespread in shallow soils across at the site above cleanup goals (approximately the upper 5 to 6 feet).

Chemical concentrations generally attenuate rapidly with depth. Specific features at the site associated

with elevated chemical impacts, and areas where chemical impacts have been identified at depth, are

summarized below. Chemical concentrations in soil above cleanup goals are illustrated on Figure E-1 in

Appendix E.

4.1.1 Former Oil Tank

A below-ground vessel used to store fuel product was historically located in the north-central portion of

the site (see Figure 2). As depicted on historical documents, the tank was a cylindrical vessel

approximately 15 feet in diameter, and received fuel product from rail cars via a 4-inch-diameter pipeline.

Investigation of this area indicates the tank was buried in-place. Soils within and in the immediate vicinity

of the tank are impacted by elevated concentrations of PAHs, petroleum hydrocarbons, and aromatic

hydrocarbons to a depth of approximately 12 ft-bgs. This area was the subject of the SVE pilot test

described in Section 2.4. Additional chemical impacts have been identified in a zone between

approximately 20 and 22 ft-bgs beneath and in the immediate vicinity of the former oil tank. Two

detections of naphthalene and one detection of ethylbenzene from this deep soil interval (20 to 22 feet

bgs) slightly exceed their respective risk-based cleanup goals.

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4.1.2 Former Oil Supply Line

As described in Section 2.5.4, previous investigations have identified the presence of a 4-inch-diameter steel conduit buried approximately 1.5 ft-bgs (see Figure 2). The pipeline conveyed fuel product between rail tank cars and the former oil tank. Approximately 40 feet of conduit remains in-place, and no evidence of chemical impact from the pipe were reported during investigation activities. Soil borings advanced at several locations along the pipeline have identified elevated concentrations of PAHs, petroleum hydrocarbons, and lead at depths ranging from 5 to 12 ft-bgs.

4.1.3 Former Lampblack Separators

Two above-ground former MPG waste receptacles (identified on drawings as ‘former lampblack separators’) were historically located in the southeast quadrant of the site. Investigation of this area has revealed the presence of a 1.5-foot-thick layer of concrete overlain by 1 to 6 inches of surface soils. Lampblack was identified between 5 and 5.5 ft-bgs in one of three soil borings (SB-8) advanced beneath the former separator, and elevated concentrations of petroleum hydrocarbons and PAHs have been identified to 6.5 ft-bgs. Investigation of soils immediately west of the lampblack separators identified elevated concentrations of PAHs to 9 ft-bgs. Data from additional soil borings advanced in this area suggest these impacts are limited in extent.

4.1.4 Former Storage Holder #3

Former gas storage holder #3 was historically located in the southwest quadrant of the site. The footprint of the holder extended beyond the current property boundary into South Sacramento Street, across the parcel of land sold to the City of Lodi in 1958. Soil borings advanced beneath the former gas holder encountered approximately 1 to 6 inches of surface soils underlain by concrete ranging in thickness from 1 to 3 feet. This concrete is likely the footing for the former gas holder. Soils beneath the former gas holder are impacted by lampblack and elevated PAHs to depths of 4 ft-bgs.

4.2 SOIL GAS

Soil gas conditions beneath the site have been characterized during the remedial investigations using passive and active soil gas sampling methods, and estimated health risks associated with COPCs in soil gas via vapor intrusion for future on-site residential populations are at or below acceptable levels as concluded in the HHRA based on soil gas data collected during the RI. As described in Section 3.3.3, soil gas samples were not collected from areas with the highest concentrations of VOCs and CPAHs in soil (i.e., at SB-6 and SB-49). Soil gas conditions will be evaluated following remediation.

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4.3 LIW SITE

Chemical impacts consistent with those observed at the site have been identified in shallow soils on the LIW property to the south. In general, these concentrations are present in surface soils, attenuate to below screening levels between the ground surface and 3 ft-bgs, and are present within 15 feet of the fence line.

4.4 SOUTH SACRAMENTO STREET

Investigation of soils beneath South Sacramento Street has identified chemical impacts to soils consistent with historical MGP operations. In general, shallow soils within the area of the street historically part of the site (roughly to the current centerline of South Sacramento Street) contain shallow chemical impacts from elevated PAHs, petroleum hydrocarbons, and lead. The impacts are consistent with shallow soil conditions elsewhere on the site. Deeper impacts (to 6 ft-bgs) have been identified at locations in the center of the street, adjacent to the historical gas holders. Investigation beneath the sidewalk along the western side of South Sacramento Street identified one concentration of BaPe (1.86 mg/kg in the sample from 0.5 ft-bgs at SB-27) above the ambient-based cleanup goal of 0.9 mg/kg; however, this concentration is within the range of concentrations in the ambient data set for northern California. Further, no visual or olfactory evidence of MGP impacts were observed at SB-27 and investigation data indicates attenuation of MGP-related chemicals with distance from the site Previous investigations identified two historical gas distribution pipelines extending from the former general shop and store room on the site (see Figure 2). Remedial investigations determined that these pipelines were historically severed approximately 15 feet laterally into the Street from the site. Underlying soils have not been impacted.

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5.0 Evaluation and Selection of Remedial Technologies

The purpose of this section of the HRA/FS/RAW is to identify and compare possible removal action alternatives that may best achieve the remedial objectives discussed in Section 5.1. The removal action alternatives were screened and evaluated on the basis of effectiveness, implementability, and cost criteria.

5.1 POTENTIAL REMEDIAL ACTIONS

Possible response actions to address COPCs in soil include excavation and off-site disposal, capping in-place, and institutional controls. These response actions have been assembled into candidate removal alternatives for the site. Screening of several technology types with respect to effectiveness, implementability, and cost was conducted to select removal actions for further evaluation. The three possible removal actions are described below.

Alternative 1 – No further action. As required by the DTSC, the ‘No Further Action’ (NFA) alternative has been included to provide a baseline for comparisons among other remedial alternatives. The NFA alternative would not require implementing any measures at the site and no costs would be incurred.

Alternative 2 – Containment/capping in-place. This alternative consists of capping the surface of the impacted areas with asphalt, concrete, or similar permeable/semi-permeable material. The cap would minimize the potential for site users to come into contact with the contaminated soil. If capping is selected, the entire site and LIW, representing approximately 0.86 acre of affected soil, would be covered. This method would require a land use restriction to be executed between DTSC and pertinent property owners to ensure that the cap is operated and maintained and that future uses of the affected properties are consistent with the operation and maintenance of the cap. An operation and maintenance plan would be submitted and approved by DTSC which specifies the operation and maintenance requirements and provides financial assurance for future operation and maintenance of the cap.

Alternative 3 – Excavation and off-site disposal of soils. The excavation/off-site disposal alternative consists of removing and transporting impacted soil to an appropriate, permitted off-site facility for disposal. Excavation includes using loaders, backhoes and/or other appropriate equipment. Excavation operations will generate dust emissions. Suppressant, water spray, and other forms of dust control may be required during excavation, and workers may be required to use personal protective equipment (PPE) to reduce exposure to COPCs. Sloping excavation sidewalls may result in increased volume of soil requiring excavation.



Confirmation soil sampling and analysis would be conducted to verify that cleanup criteria were met.

5.2 REMEDY EVALUATION AND SELECTION

5.2.1 Effectiveness

Evaluation of effectiveness refers to the potential for a remedy to achieve the remedial objectives for the site:

Remedial Alternative #1 – No further action. Because current site conditions preclude unrestricted site use, the ‘no further action’ alternative does not effectively achieve the remedial objectives.

Remedial Alternative #2 – Containment/capping in-place. Under this alternative, significant technical controls and features would be required to allow residential use; therefore, such use would not be considered ‘unrestricted’.

Remedial Alternative #3 – Excavation and disposal of soils. The proposed excavation would remove soils impacted above risk-based and ambient-based screening goals protective of unrestricted site use. Therefore, the excavation alternative achieves the remedial objectives for the site.

5.2.2 Implementability

Implementability refers to the technical feasibility for a remedy to be implemented.

Remedial Alternative #1 – No further action. This remedy can be readily implemented.

Remedial Alternative #2 – Containment/capping in-place. This remedy can be readily implemented. Minor grading and site preparation would be required in advance of paving.

Remedial Alternative #3 – Excavation and disposal of soils. This remedy can be readily implemented.



5.2.3 Cost

The estimated cost to implement each of the three remedial alternatives is summarized in the following table.

Remedial Alternative Associated Tasks Estimated Cost #1 – No Further Action - No Associated Tasks - $0 Total Estimated Cost of Remedial Alternative #1 $0 #2 – Containment/Capping In-Place

Installation of Passive Vapor Abatement System and Vapor Barrier

$80,000

Paving the Site $30,000 Draft/Record Land Use Restriction $10,000 Annual Inspection and Maintenance of Cap (30 years)

$120,000

Total Estimated Cost of Remedial Alternative #2 $240,000 #3 – Excavation and Disposal of Soils – Site and LIW

Excavation, Removal and Disposal of Soils

$925,000

Dust and Odor Controls $90,000 Import Clean Fill, Backfill and Compaction

$175,000

Excavation and Disposal of Soils – South Sacramento Street

Excavation, Removal and Disposal of Soils

$200,000

Dust and Odor Controls $25,000 Import Clean Fill, Backfill and Compaction

$45,000

Street Paving and Infrastructure Restoration

$75,000

Shoring $50,000 Oversight, Monitoring and

Confirmation Sampling and Testing $250,000

Post-Remediation Soil Gas Workplan, Sampling, Health Risk Assessment and Closure Report

$150,000

Total Estimated Cost of Remedial Alternative #3 $1,985,000



5.3 SELECTION OF REMEDIAL ALTERNATIVE

Stantec reviewed the possible remedial alternatives by independently evaluating each method in terms of effectiveness, implementability, and cost. The most important comparison criterion was effectiveness, measured as the ability for a particular remedy to achieve the remedial objectives for the site. As presented in Section 5.1, the primary remedial objective for the site is to reduce the concentrations of MGP-related chemicals to numerical cleanup goals for unrestricted site use to the extent practicable and feasible in consideration of logistical constraints such as buried utilities in public rights of way. Although each of the three remedial alternatives is technically feasible, obtaining unrestricted designation cannot be accomplished by the NFA or the capping in-place alternatives. Therefore, the proposed remedial method for the site is excavation and disposal of impacted soils. In addition to being effective in likely achieving the unrestricted land use designation, excavation and disposal is deemed to be relatively cost-effective for a site of this size (0.73 acre), where the majority of the chemical impact contributing to excess risk under a future unrestricted use scenario is present in shallow soils.

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6.0 Proposed Remedial Areas

The following sections describe the three remedial areas: 1) the site, 2) the off-site area to the west (South Sacramento Street), and 3) the off-site area to the south (LIW). The extent and depth of proposed excavation areas are illustrated on Figure 3 through 5. The remedial activities described below are expected to remove the majority of COPCs present in soils at concentrations above numerical cleanup goals. The proposed excavation will also remove the majority of TPH-impacted soils present in shallow soils beneath the three remedial areas.

6.1 ON-SITE REMEDIATION

The on-site remedial area consists of the entire 0.73-acre site, which will be excavated to 3 ft-bgs. Several proposed focused excavations are illustrated on Figure 3 and summarized below:

Remedial Area Designation Depth/Description Entire Site SITE Excavate entire site to 3 ft-bgs, with additional limited

excavation to approximately 4 ft-bgs at select locations (see Figure 3)

Former Oil Tank OT Excavate former oil tank to 14 ft-bgs Oil Supply Line OSL1 Remaining oil supply line (approximately 40 linear feet)

will be removed when entire site is excavated to 3 ft-bgs OSL2 Excavate area of historical soil boring SB-23 to 13 ft-bgs OSL3 Excavate area along eastern property line to 7 ft-bgs

Lampblack Separators LBS Excavate lampblack separators and adjacent area to the south to 7 ft-bgs

Storage Holder #3 – On-site Area SH3A Excavate beneath former storage holder #3 to 5 ft-bgs Test Pit #2 TP2 Excavate area of investigation test pit #2 to 10 ft-bgs Test Pit #11 TP11 Excavate area of investigation test pit #11 to 10 ft-bgs

As discussed in Section 4.1.1, during previous investigations chemical impacts have been identified in a zone between approximately 20 and 22 ft-bgs beneath and in the immediate vicinity of the former oil tank (remedial area OT). The impacts are primarily TPH with naphthalene and ethylbenzene in a few samples at concentrations slightly above cleanup goals. Considering the depth of the contaminants and the absence of groundwater impacts, these impacted soils will remain in place. Leaving these soils in place does not adversely affect the remedial objective of unrestricted Site use. Post-remediation soil vapor samples will be collected following remediation to confirm that the remedial objectives have been achieved.

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6.2 OFF-SITE REMEDIATION – SOUTH SACRAMENTO STREET

Proposed remediation within South Sacramento Street consists of removing shallow soils to 2 ft-bgs and completing additional focused excavations. Remedial areas are summarized below, and illustrated on Figure 4. The proposed excavation will be completed to the extent practicable and feasible given site constraints such as locations of utilities and placement of shoring. As described in Section 4.4, the concentration of BaPe exceeded the ambient-based cleanup goal in one sample collected from beneath the sidewalk west of South Sacramento Street (0.5 ft-bgs at SB-27). Due to the relatively low concentration of 1.86 mg/kg compared to the ambient-based cleanup goal of 0.9 mg/kg, the lack of visual or olfactory evidence of MGP impacts, the demonstrated attenuation of MGP-related chemicals with distance from the site, and the absence of MGP-related chemicals from additional samples collected beneath the western sidewalk, Stantec proposes excluding SB-27 from the South Sacramento Street remedial area.

Remedial Area Designation Depth/Description South Sacramento Street SSS1 Excavate adjacent section of street to 2 ft-bgs

Historical Gas Transmission Pipes SSS2 Removal of historical gas transmission pipes extending into South Sacramento Street

Storage Holder #2 SSS3 Excavate adjacent to former storage holder #2 to 8 ft-bgs

Storage Holder #3 – Off-site Area SH3B Excavate beneath former storage holder #3 to 5 ft-bgs

SSS4 Excavate adjacent to former storage holder #3 to 7 ft-bgs

6.3 OFF-SITE REMEDIATION – LIW

Proposed remediation at LIW consists of excavating soils within 25 feet of the shared property line to 3 ft-bgs, with focused excavations to 4.5 ft-bgs. Remedial areas are summarized below, and illustrated on Figure 5.

Remedial Area Designation Depth/Description LIW – Shallow Soil LIW1 Excavate adjacent to property line to 3 ft-bgs

LIW2A/2B Excavate to 4.5 ft-bgs.

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7.0 Removal Action Implementation

The following sections describe work tasks associated with remedial excavation of the site, LIW, and

within South Sacramento Street. Detailed procedures relating to remedial excavation, including health

and safety procedures, will be presented in a forthcoming remediation work plan.

7.1 PUBLIC PARTICIPATION

In accordance with the requirements of the VCA, a draft Notice of Exemption was prepared by the DTSC

for the implementation of the RAW in order to satisfy California Environmental Quality Act (CEQA)

requirements. A public comment period for the draft HHRA/FS/RAW and CEQA Notice of Exemption was

held between May 20 and June 21, 2012. The purpose of the public comment period was to provide the

public with an opportunity to review information regarding the project and to solicit public comments on

the adequacy of the draft HHRA/FS/RAW and appropriateness of the notice of exemption. DTSC

received one comment, which was addressed. The DTSC responsiveness summary and final Notice of

Exemption are attached as Appendix F.

A Public Participation Plan (PPP) was prepared in 2008 as a means to assist the DTSC in assessing the

potential level of community interest in the investigation and mitigation process. The PPP provided a

thumbnail sketch of the Site and the community in which it is located, identified community interest and

concern in investigation and cleanup activities, and recommended future public participation activities to

facilitate community input into DTSC's decision-making process for the Site.

Throughout the project, interested parties will be able to review project documents at the designated

repository; the Lodi Public Library located at 201 West Locust Street, Lodi, California 95240.

7.2 SITE MANAGEMENT

During remediation, site management activities will be implemented as described in the following

sections.

7.2.1 Site Access

Site access will be limited to authorized personnel, including DTSC staff. A sign-in log will be maintained

at the site entrance for documentation of all on-site personnel. Times and locations for site access shall

be authorized by PG&E or its representative.

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT Removal Action Implementation July 11, 2012


7.2.2 Site Security

The site is currently surrounded by a chain-link fence topped with barbed wire with two locking gates facing South Sacramento Street. During excavation activities, efforts will be made to preserve the existing fence. If the fence must be removed during site work, temporary fencing will be installed for the duration of the project, and replaced with a permanent enclosure following excavation and backfill activities. During loading operations, each open gate will be monitored by project personnel. During excavation at LIW, the fence between the site and the adjacent property will be removed, and the work area will be surrounded with temporary fencing to create an exclusion zone. Similar measures will be implemented during work within South Sacramento Street.

7.2.3 Traffic Control

Traffic control measures will be implemented during soil removal and site restoration activities. A flagman will be posted at the site entrance and exit to ensure safe and uninterrupted flow of traffic in and out of the site. Appropriate signage will be installed along South Sacramento Street and at key intersections, and maintained for the duration of the project. Trucks and equipment can access the site and the LIW property from South Sacramento Street. Trucks will be loaded on-site to the extent feasible, and additional staging and/or loading will be conducted on the LIW property under agreement with the property owner. During excavation of South Sacramento Street, trucks and equipment will be staged on-site and loading will be completed on-site to the extent possible. The proposed trucking route to and from California Highway 99 is illustrated on Figure 6, but may be revised during the project planning stage based on input from the City of Lodi and the selected transportation contractor. Prior to the start of work, a traffic control plan will be prepared in accordance with the Work Area and Traffic Control Handbook (WATCH; California Joint Utility Traffic Control Committee 1996) and/or local regulatory guidelines, as required.

7.3 REMEDIATION IMPLEMENTATION

Site remediation is expected to be performed during the summer months, when rainfall in the area is typically rare to non-existent. Stantec estimates that site preparation, excavation, confirmation sampling, and backfill/compaction of the three remedial areas can be completed in approximately 12 to 16 weeks. The general sequence of work from pre-construction to removal of impacted soil, site restoration, and site cleanup is described below.

7.3.1 Pre-construction

The following pre-construction activities will be performed:



PG&E will complete public notification tasks as required by DTSC;

All applicable and necessary permits will be obtained, including grading and encroachment permits;

Soils scheduled for excavation will be profiled for disposal at appropriate disposal facilities;

A survey of the existing site features and location will be conducted to satisfy the City of Lodi and San Joaquin County grading permit requirements and to ensure proper restoration after excavation activities are completed;

Existing utility lines that will be encountered during the work will be identified and confirmed. Any requirements, specifications and/or permits pertaining to the affected utilities will be obtained from the utility owners;

Soil quality records of import fill sources will be reviewed to determine suitability. If the existing records are insufficient, additional soil testing will be performed in general accordance with DTSC advisory criteria for evaluating imported fill materials (DTSC, 2001a);

A traffic control plan will be prepared in accordance with the WATCH (American Public Works Association, 2006) and/or local regulatory requirements, as appropriate; and,

Existing soil vapor monitoring and extraction wells will be abandoned in accordance with San Joaquin County Department of Environmental Health requirements.

7.3.2 Site Preparation

The following site preparation activities will be conducted prior to the removal action:

A pre-excavation video of the area will be recorded to document existing site and vicinity conditions;

Remaining brush and trees will be removed from the perimeter of the site, and from the LIW property adjacent to the common property line;

The Exclusion, Decontamination, and Support Zones will be identified and clearly marked. The Exclusion Zones will include all areas of excavation, contaminated soil staging, and truck loading. The Decontamination Zones will be located immediately adjacent to the Exclusion Zones for purposes of decontaminating personnel, equipment, and vehicles exiting the Exclusion Zones. The Support Zones will be located within the designated work areas, but outside the Exclusion and Decontamination Zones. The Support Zones will be used to temporarily store equipment, vehicles, and personnel; and,



Temporary facilities and utilities (i.e., sanitation facilities, power, lighting, telephones, etc.) will be installed as necessary for use by the on-site personnel.

7.3.3 Site Demolition

Concrete and asphalt will be removed and disposed of at a recycler. The south-central portion of the site is partially covered by degraded asphalt, and concrete footings, foundations, or supports have been identified at the following locations:

The former general shop and meter house in the northwest corner of the site (foundation); The former relief holder #1 (partial footing); The former garage building north of the relief holder (partial footing); The former lampblack separators (footing); and, The former storage holder #3 (footing).

If additional concrete is discovered during excavation activities, it will be segregated for recycling as practical.

7.3.4 Excavation

Excavation areas at the site, South Sacramento Street, and LIW are illustrated on Figures 3 through 5, respectively. Prior to the start of the excavation, all health and safety, noise, and dust control equipment and materials will be prepared and positioned for immediate use, as necessary. Dust and noise monitoring will be conducted during work activities and controls will be used as appropriate to minimize any impacts to existing facilities, on-site workers, and the public. It is anticipated that the majority of materials will be direct-loaded into trucks. In the event that stockpiling of soil is necessary, 10-mil plastic sheeting or plywood will be placed beneath stockpiles. All stockpiled soil will also be covered with 10-mil plastic sheeting and secured with sandbags and/or other anchoring devices. The following sections describe proposed remediation activities and one potential sequence of events. However, the actual approach and sequence of events may be modified during the design, planning, and permitting stages of the project.



Excavation of South Sacramento Street

Remediation of South Sacramento Street will be completed first to allow the site to be used for staging of equipment and loading of soils. Following installation of necessary traffic controls and access restrictions, remedial areas SSS1, SSS2, and SH3B will be excavated. Areas SSS3 and SSS4 will then be excavated and shoring installed during excavation to protect the integrity of South Sacramento Street to the west. Utilities encountered during excavation will be protected and left in-place. The South Sacramento Street excavations will be immediately sampled, backfilled and compacted, and resurfaced to return the street to unimpeded use and to allow access for on-site remediation. Excavation of the Site and LIW

Excavation of the site and LIW will generally be completed simultaneously, as both remedial areas will initially be excavated to a depth of 3 ft-bgs. Based on the shallow depth of excavation, shoring is not anticipated. Loading and/or stockpiling operations will be conducted on the site, with material left in-place at the two driveways entering the site from South Sacramento Street to allow entrance and egress. Following removal of shallow soils, the deeper excavations will be completed. Sidewalls of excavations extending deeper than 5 feet from the excavated site grade will be benched or sloped back to allow safe working conditions. Remediation areas in the southern portion of the site (SH3A, TP11, LBS, SB64 and SB9) will be completed and backfilled first, to allow room on the southern half of the site during the deeper excavations in the northern half. Backfill and compaction of the LIW excavation will also be completed during this time.

7.3.5 Backfill and Compaction

Following receipt of confirmation sample results which confirm that the cleanup goals have been met, the site will be backfilled to pre-existing grade with imported engineered fill materials and compacted to 90 percent relative compaction per Modified Proctor (American Society for Testing and Materials or ASTM standard D 1557 [2007]), unless otherwise specified in the City of Lodi or San Joaquin County grading permit. Prior to bringing fill material on-site, Stantec will review the soil quality data of the source material. All imported fill will be free of contamination and debris. Organic compound concentrations will be below detectable limits, and metal concentrations will be at typical background levels. Backfill soil sampling will be conducted according to the “Simple Random Sampling” procedure described in Test Methods for Evaluating Solid Waste, Physical/Chemical Methods (SW-846; USEPA, 2000).

7.3.6 Site Restoration

Following backfilling and compaction of the remedial excavations, the upper 4 inches of the site and the LIW excavation will be finished with aggregate base rock to minimize wind disturbance of underlying soils. South Sacramento Street will be resurfaced in accordance with encroachment and grading permit requirements.



7.4 MONITORING AND CONTROL

Control measures presented in this section will be implemented to identify, monitor, and mitigate noise, dust, vapors, and odors. Appropriate mitigation measures for each type of nuisance will be available at all times during excavation activities. The purpose of the control measures is to protect the health and safety of on-site workers and the general public and to prevent nuisance conditions.

7.4.1 Noise

Any noise above 85 decibels will be considered a noise source. Activities such as heavy vehicle and equipment operation, concrete or asphalt saw-cutting, generator operation, and excavation equipment operation may be noise sources. Manufacturer equipment specifications will be reviewed for noise levels produced by any on-site equipment. If necessary, alternative equipment may be selected to reduce noise levels. Potential noise receptors could include on-site workers, nearby homeowners and business operations, pedestrians near the site, and vehicle drivers passing the site. Noise monitoring will occur within the Exclusion Zone and at the perimeter of the site, and will be conducted using a sound level meter. The monitoring frequency will be determined according to the type and location of operations. Appropriate worker hearing protection will be required for any anticipated noise level above 85 decibels for eight hours of exposure (time-weighted average). Also, workers will be required to have appropriate hearing protection at all times within the Exclusion Zone. Workers shall have completed a hearing conservation program that meets the requirements of California Code of Regulations, Title 8, Section 5097. Noise mitigation measures will be specified based on the results of the noise monitoring. If the noise level exceeds 85 decibels outside the Exclusion Zone, mitigation measures may include one or more of the following:

The work area will be expanded such that the noise level is below 85 decibels at the perimeter; Mufflers will be used on selected equipment to mitigate noise; Sound barriers will be placed around the work area; Alternate equipment will be specified; and, Operation times will be modified.

7.4.2 Air

Land use in the vicinity of the site is commercial and residential. Perimeter air monitoring will be performed during the excavation activities to confirm that chemical of concern (COC) in dust and/or organic vapors do not migrate off-site at unacceptable levels. The perimeter air data will be used in



conjunction with real-time particulate data to make operational decisions including measures for dust control, PPE, and work stoppage. Air monitoring will be conducted throughout the excavation and loading activities and will consist of real-time data collection for particulates (MiniRAM) and organic vapors (photoionization detector [PID]), and laboratory analysis of data collected from the perimeter high volume air sampling stations and/or other appropriate equipment for the sampling media. The remediation work plan will provide acceptable levels for the field activities based on site-specific data and exposure calculations. The MiniRAM and PID data will be used to determine when engineering controls are required to prevent unacceptable dust and/or organic vapor levels. If engineering controls are not capable of sustaining acceptable levels in worker areas and/or at the site perimeter, the field data will be used to justify work stoppage until site conditions improve.

7.4.3 Odor

Engineering controls will be applied during excavation to minimize objectionable odors. Should odor mitigation be deemed necessary during excavation, an odor suppressant will be applied directly to soils during excavation and loading. Every effort will be made to not stockpile odorous soils on-site, but rather to load such soils directly to expedite removal from the site.

7.5 STORMWATER MANAGEMENT

All storm-water management systems shall comply with the procedures outlined in US EPA guideline manual Processes, Procedures and Methods to Control Pollution Resulting from All Construction Activity (US EPA, 1973). Because this project will result in a disturbance of less than one acre, the project does not require a State Water Resources Control Board (SWRCB) National Pollutant Discharge Elimination System (NPDES) General Permit for Storm Water Discharges Associated with Construction Activity (General Permit). As defined by SWRCB Order No. 99-08-DWQ, a General Permit is not required for “construction projects that result in disturbance of less than one acre of total land area.” The purpose of implementing storm water management measures is to prevent surface water from entering or exiting the work area. Prior to the start of excavation activities, the storm water receptacles (e.g., sumps, storm drains) at and near the site will be located and protected to prevent an unauthorized release. Temporary controls will include placing waterproof covers over receptacles or berms around receptacles. These temporary controls will be inspected daily to ensure proper placement and integrity. During excavation activities, berms (e.g., sandbags) will be placed or constructed around the excavation area to prevent water run-on or run-off. All soil piles (if any) shall be covered with plastic and surrounded by berms. If dust control is applied (e.g., water), precautions will be taken to prevent ponding and/or off-site migration of the dust control agent.



7.6 WASTE TRANSPORTATION AND DISPOSAL

The objective of the waste transportation and disposal program is to handle, transport, and dispose of all materials according to the pertinent regulations and in an environmentally sound and safe manner. The procedures have been developed in accordance with the Guidance for Developing Transportation Plans for Removal or Remedial Actions (DTSC, 2001b).

7.6.1 Characteristics and Destination of Soils

The majority of site soils are expected to receive a Class II waste designation. Approximately 15 percent of soils will qualify as Class I non-Resource Conservation and Recovery Act (RCRA) hazardous waste due to elevated concentrations of lead and/or benzene. Soils to be excavated will be profiled for disposal before excavation. As a hazardous waste generator, PG&E will secure a temporary EPA Identification Number from the USEPA for proper management of the hazardous waste. Compliance with the DTSC requirements of hazardous waste generation, temporary on-site storage, transportation, and disposal is required. Any container used for on-site storage will be properly labeled with a hazardous waste label, and transported off-site for disposal within 90 days. Any shipment of hazardous wastes in California will be transported by a registered hazardous waste hauler under a uniform hazardous waste manifest. ‘Land ban’ requirements will also be followed, as necessary. Any shipment of non-hazardous waste in California will be transported under a non-hazardous waste manifest or bill-of-lading. Soils classified as Class II (non-hazardous) will be transported to Allied Waste’s Forward Landfill in Manteca, California, or to Waste Management’s Altamont Landfill in Livermore, California, for disposal. Soils classified as Class I (California hazardous) waste will be transported to Waste Management’s Kettleman Hills, California facility, or to Clean Harbors’ Buttonwillow, California facility for disposal.

7.6.2 Truck Transportation

Approximately 5,800 cubic yards (8,800 tons) of soil will be removed from the site, South Sacramento Street, and LIW. Assuming each truck carries 18 tons, approximately 490 truck trips will be required to off-haul impacted soils. Stantec estimates that an average of 24 trucks can be loaded each day. All permitted disposal facilities operate a certified weight station at their facility. As such, each truck will be weighed before off-loading its payload. Weight tickets or bills of lading will be provided to the removal action subcontractor after all the soil has been shipped off-site. Below is a summary of the truck route from the site to each of the two proposed disposal facilities. The truck route to and from Highway 99 is illustrated on Figure 6.

AW Forward Landfill –The landfill facility is located in Manteca, approximately 26 miles south of the site. Trucks will proceed south on Highway 99.



WM Altamont Landfill – The landfill facility is located in Livermore, California, approximately 48 miles southwest of the site. Trucks will proceed south on Highway 99; west on Highway 4; south on Interstate 5; and west on Highway 205/580.

CWM Kettleman Hills –The landfill facility is located in Kettleman Hills, approximately 200 miles south of the site. Trucks will proceed south on Highway 99; f west on Highway 4; and south on Interstate 5..

CH Buttonwillow Landfill – The landfill facility is located in Buttonwillow, California, approximately 230 miles south of the site. Trucks will proceed south on Highway 99; west on Highway 4; and south on Interstate 5

The truck routes described above may be modified during project planning based on input from the City of Lodi and the selected transportation contractor. Transportation of soils is expected to occur during the week (Monday through Friday) during typical business hours (7 AM to 5 PM). Before leaving the site, each truck driver will be instructed to notify the site manager. Each truck driver will be provided with a Uniform Hazardous Waste Manifest, Non-Hazardous Waste Manifest, or bill-of-lading and the cellular phone number for the site manager. It will be the responsibility of the site manager to notify DTSC of any unforeseen incidents. Each truck driver will be instructed to use the freeway Call Box System (if available), a cellular telephone and/or their radio dispatch system to call for roadside assistance and report roadside emergencies.

7.6.3 Site Traffic Control

As described in Section 8.2.4, trucks will be loaded on the PG&E site, which is accessed via two gates located on South Sacramento Street. A flag person will be located at the site to assist the truck drivers to safely drive onto the site. Transportation will be coordinated in such a manner that at any given time, on-site trucks will be in communication with the site trucking coordinator. In addition, all vehicles will be required to maintain slow speeds (i.e., less than 5 miles per hour or mph) for safety and for dust control purposes. Prior to exiting the site, the vehicle will be swept to remove any extra soil from areas not covered or protected. This cleanup/decontamination area will be set up as close to the loading area as possible so as to minimize spreading the impacted soil. Prior to the off-site transport, the site manager will be responsible for inspecting each truck to ensure that the payloads are adequately covered, the trucks are cleaned of excess soil and properly placarded, and that the truck’s manifest has been completed and signed by the generator (or its agent) and the transporter. As the trucks leave the site, the flag person will assist the truck drivers so that they can safely merge with traffic on South Sacramento Street.



7.6.4 Record Keeping

The removal action contractor will be responsible for maintaining a field logbook, which will serve to document observations, personnel on-site, equipment arrival and departure times, and other important project information. Logbook entries will be complete and accurate enough to permit reconstruction of field activities. Logbooks will be bound with consecutively numbered pages and each page will indicate the date and time of the entry. All entries will be legible, written in black or blue ink, and signed by the author. Language will be factual and objective. If an error is made, corrections will be made by crossing a line through the error and entering the correct information. Corrections will be dated and initialed. Because some portion of the excavated soil likely will be profiled as hazardous waste under California or EPA regulations, the Uniform Hazardous Waste Manifest (hazardous waste manifest) form will be used to track the movement of soil from the point of generation to the point of ultimate disposition. The hazardous waste manifests will include the following information:

Name and address of the generator, transporter, and the destination facility;

United States Department of Transportation description of the waste being transported and any associated hazards;

Waste quantity;

Name and phone number of a contact in case of an emergency;

EPA Hazardous Waste Generator Number; and,

Other information required either by the EPA and/or the DTSC.

Any soil that is profiled as non-hazardous and sent off-site for disposal will be documented using a Non-Hazardous Waste Manifest or bill-of-lading form. At a minimum, this form will include the following information:

Generator name and address; Transportation company; Accepting facility name and address; Waste shipping name and description; and, Quantity shipped.

Prior to transporting the excavated soil off-site, an authorized representative of PG&E will sign each hazardous and/or non-hazardous waste manifest. The removal action site manager will maintain one copy of all hazardous and/or non-hazardous waste manifests on-site.



7.7 POST-REMEDIATION SITE EVALUATION AND RISK ASSESSMENT

Following remedial activities, confirmation soil sample data will be used to calculate post-remediation risk to potential site receptors under a future unrestricted residential land use. This evaluation will include soil gas data collected following remediation to confirm that vapor intrusion risks are below the acceptable threshold. Post-remediation soil gas sampling procedures will be described in a work plan submitted to the DTSC following completion of remediation and site restoration. The post-remediation risk assessment will be presented with the removal action completion report. To the extent that practical constraints limit the ability to fully remove impacted soils, as might occur within South Sacramento Street, the post-remediation risk assessment will provide the technical basis for defining the types of risk management measures that should be put in place to ensure long-term protection of human health and the environment.

7.8 SCHEDULE

Site remediation and related activities are scheduled for spring/summer 2013, the post-remediation soil gas sampling will be completed approximately six months following soil remediation, and the removal action completion report will be submitted in 2014.

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT Sampling and Analysis Plan July 11, 2012


8.0 Sampling and Analysis Plan

The proposed removal action will require the collection and analysis of samples to confirm the removal of impacted media to levels protective of the RAOs. Sidewall samples, where stipulated, will be collected from the mid-point of the sidewall, or from material that appears to be chemically impacted, if present. All sampling will be conducted in general accordance with the quality assurance/quality control (QA/QC) plan presented in Section 10.

8.1 CONFIRMATION SAMPLING LOCATIONS

8.1.1 On-site Remedial Areas

Proposed on-site remedial areas are illustrated on Figure 3.

SITE. This remedial area corresponds to excavation of the entire site to 3 ft-bgs, resulting in removal of approximately 3,700 cubic yards of material. Confirmation samples will be collected at the nodes of a 30-foot by 30-foot grid, except from locations where deeper excavation will be completed. Approximately 27 discrete samples will be collected from the floor of the 3-foot excavation.

OT. Excavation of the oil tank to 14 feet below original grade will generate approximately 128 cubic yards. Three confirmation samples will be collected from the floor of the excavation, and four from the sidewalls, for a total of seven discrete samples.

OSL1. The former oil supply line will be removed during site-wide excavation. Three discrete samples will be collected beneath the former trace of the 75-foot pipeline.

OSL2. Excavation of OSL2 to 13 feet below original grade will generate approximately 67 cubic yards. Two confirmation samples will be collected from the floor of the excavation, and four from the sidewalls, for a total of six discrete samples.

OSL3. Excavation of OSL3 to 7 feet below original grade will generate approximately 67 cubic yards. Two confirmation samples will be collected from the floor of the excavation, and four from the sidewalls, for a total of six discrete samples.

LBS. Excavation of the lampblack separators to 7 feet below original grade will generate approximately 612 cubic yards. Seven confirmation samples will be collected from the floor of the excavation, and 14 from the sidewalls, for a total of 21 discrete samples.



SH3A. Excavation of the on-site portion of the former storage holder to 5 feet below original grade will generate approximately 210 cubic yards. Three confirmation samples will be collected from the floor of the excavation, and four from the sidewalls, for a total of seven discrete samples.

TP2. Excavation of TP2 to 10 feet below original grade will generate approximately 15 cubic yards. One confirmation sample will be collected from the floor of the excavation, and four from the sidewalls, for a total of five discrete samples.

TP11. Excavation of TP11 to 10 feet below original grade will generate approximately 15 cubic yards. One confirmation sample will be collected from the floor of the excavation, and four from the sidewalls, for a total of five discrete samples.

8.1.2 Off-site Remedial Areas – South Sacramento Street

Proposed remedial areas within South Sacramento Street are illustrated on Figure 4.

SSS1. This remedial area corresponds to the length of the street adjacent to the site, excavation of which to 2 ft-bgs will generate approximately 342 cubic yards. Twelve confirmation samples will be collected from the floor of the excavation.

SSS2. Excavation of SSS2 to 3 feet below original grade will generate approximately 15 cubic yards. Two confirmation samples will be collected from the floor of the excavation.

SSS3. Excavation of SSS3 to 8 feet below original grade will generate approximately 64 cubic yards. Two confirmation samples will be collected from the floor of the excavation, and four from the sidewalls, for a total of six discrete samples.

SSS4. Excavation of SSS4 to 7 feet below original grade will generate approximately 125 cubic yards. Two confirmation samples will be collected from the floor of the excavation, and four from the sidewalls, for a total of six discrete samples.

SH3B. Excavation of the off-site portion of the former storage holder to 5 feet below original grade will generate approximately 52 cubic yards. Two confirmation samples will be collected from the floor of the excavation, and two from the sidewalls, for a total of four discrete samples.

8.1.3 Off-site Remedial Areas – LIW

Proposed remedial areas at the LIW property are illustrated on Figure 5.

LIW1. This remedial area corresponds to the length of the site, extending approximately 25 feet onto the LIW property. Excavation of this area to 3 ft-bgs will generate approximately 460 cubic



yards. Twelve confirmation samples will be collected from the floor of the excavation, and six from the southern sidewall, for a total of 18 discrete samples.

LIW2A. Excavation of LIW2A to 4.5 feet below original grade will generate approximately 6 cubic yards. One confirmation sample will be collected from the floor of the excavation, and one from the southern sidewall, for a total of two discrete samples.

LIW2B. Excavation of LIW2B to 4.5 feet below original grade will generate approximately 6 cubic yards. One confirmation sample will be collected from the floor of the excavation, and one from the southern sidewall, for a total of two discrete samples.

8.2 SAMPLE COLLECTION AND ANALYSIS

8.2.1 Sampling Equipment

Samples will be collected from the bottom of the excavation using stainless steel or Teflon®-coated trowels, or a stainless steel slide hammer equipped with sample sleeves. Field personnel will use new, disposable Nitrile gloves at each sample location, and collect soil samples in laboratory-supplied sample containers. Soils from excavations extending deeper than 3 feet below existing grade will be sampled from the bucket of a backhoe.

8.2.2 Equipment Decontamination

All reusable field equipment used to collect and handle samples or collect field measurements will be decontaminated before coming into contact with any sample. Equipment will be decontaminated between sampling locations using a non-phosphate detergent, a potable water rinse, and a deionized water final rinse. Decontamination fluids will be containerized and disposed of following completion of the work.

8.2.3 Sample Handling

Soil samples will be labeled and placed in an insulated cooler with ice pending delivery to a state-certified analytical laboratory for analysis. A completed chain-of-custody record will accompany each shipment of samples.

8.2.4 Analytical Parameters

Confirmation soil samples will be analyzed for the following constituents, corresponding to the COPCs which contribute to excess cancer and non-cancer risk under current site conditions (Section 5.3):

PAHs using EPA Method 8270; BTEX using EPA Method 8260B; and



Antimony, cobalt, lead, nickel and thallium using EPA Method 6010.

8.2.5 Data Evaluation

Soil samples will be analyzed to confirm that the cleanup goals for the site have been met. If sampling indicates that additional excavation is required, the area will be over-excavated to an appropriate depth if feasible and accessible, and confirmation soil samples will be collected from the excavation bottom and each of the four sidewalls. Secondary confirmation soil samples will be analyzed for appropriate constituents.

8.3 WASTE DISPOSAL CLASSIFICATION SAMPLING

PG&E intends to use existing data to profile excavated soils for disposal to the extent possible. All soils removed from the site will be disposed of at the Allied Waste Forward Landfill in Manteca, California; Waste Management’s Altamont Landfill in Livermore, California; Clean Harbors’ Buttonwillow Landfill in Buttonwillow, California; or the Chemical Waste Management solid waste facility in Kettleman Hills, California. The majority of soil will be classified as Class II; a small amount of soil (estimated at approximately 15 percent) will likely be classified as Class I California hazardous waste due to elevated concentrations of lead and/or benzene. Some degree of pre-excavation soil sampling may be performed to facilitate the landfill’s classification of the material.

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT Quality Assurance Plan July 11, 2012


9.0 Quality Assurance Plan

The purpose of the Quality Assurance Plan (QAP) is to describe procedures to be followed in managing the project tasks and resultant data, and measures to ensure the validity and accuracy of each project task and the generated data. The objective of adhering to procedures presented in the QAP is to ensure the collection of representative data that can be used to meet the objectives of the project (i.e., that data can be relied upon to accurately represent post-remedial soil chemical conditions). In general, data quality and representativeness are assured by adherence to the formalized and standardized field and laboratory procedures outlined herein. All field and laboratory procedures will be performed by trained, qualified personnel.

9.1 PROJECT ORGANIZATION AND RESPONSIBILITIES

Soil samples will be collected under the direction of the Project Manager and a California Professional Geologist or Professional Engineer. All personnel involved with this project are aware of their individual responsibilities, as described in the following subsections, and understand that QA must be applied throughout the entire duration of the project.

9.1.1 Project Manager

The Project Manager will be responsible for adherence to project schedules, project coordination, maintaining project documentation, and management of technical, financial, and administrative aspects of the project. The Project Manager is the primary contact between the client, the DTSC, and the project team.

9.1.2 QA Director

The QA Director for the project is responsible for implementing the QA/QC Plan to ensure that sampling and analysis procedures are properly followed. The QA Director coordinates the necessary report preparation, reviews, and also provides QA audits. For this project, the QA Director and Project Manager roles are combined.

9.1.3 Health and Safety Officer

The responsibilities of the Health and Safety Officer include implementing the health and safety plan (HASP), documenting all health and safety-related activities, and ensuring that health and safety equipment is calibrated and maintained. A HASP will be generated and present at all times on the site.



9.1.4 Field Geologist/Field Supervisor

The Field Geologist/Field Supervisor ensures that field activities are properly executed in accordance with the site-specific Work Plan and QA procedures. The Field Geologist/Field Supervisor has the authority to:

Stop any activity or procedure that is not following acceptable protocols;

Discard any sample that is not correctly collected, preserved, or transported;

Invalidate any data obtained from an improperly collected sample; and,

Invalidate any data if the proper sample handling and documentation procedures have not been followed.

9.2 CALIBRATION OF FIELD EQUIPMENT

All equipment and instruments used in the investigation will be maintained and calibrated to operate within the manufacturer's specifications so that the required sensitivity and QA/QC parameters are maintained. Analytical laboratory equipment will be maintained and calibrated in accordance with the laboratory's specific quality assurance plan and is a significant part of the laboratory accreditation evaluation. Operational procedures for all field equipment will be followed to ensure that the equipment is operating properly and that data are valid and traceable to a particular instrument. These procedures may include:

Operation theory; Functional operational checks; Routine maintenance; Calibration procedures; Simplified operational instructions; Special environmental conditions or interferences; and, Deactivation and storage procedures.

Calibration and maintenance requirements of the field equipment will follow the manufacturer's specifications.

9.3 SAMPLE HANDLING AND FIELD DOCUMENTATION

All confirmation soil samples will be collected in accordance with the protocols described in the sampling and analysis plan (Section 9.0). The following sections describe procedures for sample handling and documentation. Each sample is tracked from the time of collection by documentation which is completed



during sampling and includes the following, as appropriate: 1) field log; 2) sampling field data sheet; 3) chain-of-custody record; and 4) sample labels.

9.3.1 Sample Containers

Soil samples will be collected one of two ways. Soil samples submitted for non-volatile constituents will be collected in glass jars or in stainless steel sample sleeves. Soil samples submitted for volatile constituents will be collected into hermetically-sealed containers consistent with SW-846 Method 5035. After sample collection, soil and water sample containers will be placed in an ice chest with ice and maintained at a temperature of approximately 4°C until delivery to the analytical laboratory, where samples will be stored under refrigeration.

9.3.2 Field Documentation

The field data recorded at the time of sample collection provides an unambiguous identification of each sample. These field data include the following, as appropriate:

Date of entry; Sample matrix; Description of sampling point (location and depth); Date and time of sample collection; Field sample identification number(s); References, such as maps or photographs, of the sampling site; and, Associated field observations or measurements taken at the time of collection.

Due to the variability of sampling situations, field notes will be as descriptive and inclusive as possible, allowing subsequent parties to be able to reconstruct the sampling event from the recorded information. Language within field notes will be objective, factual, and free of inappropriate or ambiguous terminology. All field personnel are to date and sign any data entries. All field documentation will be retained.

9.3.3 Sample Chain-of-Custody Record

Chain-of-custody records are designed to create an accurate written record which can be used to trace the possession and handling of the sample from the time of collection to the time of analysis. The chain-of-custody includes the following information:

Site name Sample identification number (assigned by the scientist in the field) Sample date



Sample location, and, Type of analysis required.

Whenever the sample is transferred from one party to another, both parties sign the chain-of-custody and record the date and time of the transfer. If sample coolers are shipped to the laboratory via commercial freight (USPS, Federal Express, etc.) rather than by a laboratory courier, the coolers will be secured with custody seals.

9.3.4 Sample Labels

Sample labels will be completed and affixed to appropriate containers immediately prior to or immediately following sample collection. The label will be filled out in indelible ink and includes the following information:

Sample ID number; Date; Time; Preservatives, and, Sampler's initials.

9.3.5 Sample Collection Log

Each day in the field, the samples collected will be listed on a sample collection log. The log includes the date and time the sample was collected, name of the individual(s) who collected the sample, the sample ID, sampling location, depth, matrix, sample collection method, number of sample containers per sample, corresponding field screening results (such as PID readings), and any other notable comments.

9.4 FIELD QUALITY CONTROL SAMPLES

The level of quality control effort will be consistent with that required by standard US EPA or DTSC protocols. The data quality elements that will be checked and documented include blind (field replicate) duplicate samples, trip blanks, equipment blanks, matrix spike/matrix spike duplicates, and surrogate spiking, as described in the following sections.

9.4.1 Blind Duplicate Samples

Blind duplicate (field replicate) samples will be collected to evaluate precision associated with the reproducibility of sampling techniques and the homogeneity of sample matrices. Replicate samples will be collected at a frequency of 10 percent. Since the replicate will be “blind” to the laboratory, it will have a coded identity on its label and on the chain-of-custody record form. The actual sampling location and identification will be recorded in the sample collection log.



9.4.2 Equipment Blanks

Equipment blanks will be prepared and submitted for laboratory analysis to verify that equipment decontamination procedures are effective. Equipment blanks are submitted for analysis of the same analytes that are required for the associated field samples. The blanks are prepared by pouring water being used for decontamination (i.e., distilled or deionized water) through the field sampling device(s) and into the appropriate set of sample bottles. Equipment blanks will be preserved and handled in the same manner as the associated samples.

9.5 LABORATORY QUALITY CONTROL SAMPLES

9.5.1 Matrix Spike/Matrix Spike Duplicates

Matrix spike/matrix spike duplicates (MS/MSDs) will be prepared and analyzed by the laboratory at a frequency of one per every 20 investigative samples received. MS/MSDs are samples in which compounds are added before extraction and analyses. The recoveries for spiked compounds can be used to assess how well the method for analysis recovers target compounds.

9.5.2 Surrogate Spiking

Surrogate compounds are added before sample preparation for organics to all samples prior to extraction and analysis. The review for surrogate compounds can be used to assess method accuracy for each sample matrix.

9.6 DATA REDUCTION, VALIDATION AND REPORTING

Data from the analytical laboratory will be reviewed by internal laboratory management before being submitted to the Project Manager/QA Director. Analytical data from the laboratory must include the data report, and all related QA/QC data. The Project Manager/QA Director will be responsible for evaluation of the data, including tabulating all laboratory data and completing a QA/QC review.

9.6.1 Corrective Action

During the course of the project it will be the responsibility of the Project Manager to ensure that all of the specified sampling procedures are followed and that data meet prescribed acceptance criteria. The field and analytical procedures will be reviewed if QA/QC problems or deficiencies requiring corrective action occur. If a problem is discovered, prompt and prescribed action will be taken to correct the problem. Corrective action may be initiated based upon QC data or audit results.



9.6.2 Quality Assurance Reports

The Project Manager/QA Director will rely on written reports and memoranda documenting data assessment, audits, nonconformance, and corrective actions to verify that QA requirements are being met. QA/QC will be documented. All information received from an outside source or developed during the project will be stored in project files. The Project Manager will identify which field documents will be designated as QA records for the project file. The Project Manager will also ensure that QA records are properly stored and retrievable upon completion of the project.

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT Health and Safety Plan July 11, 2012


10.0 Health and Safety Plan

All contractors will be responsible for operating in accordance with the most current requirements of state and federal Standards for Hazardous Waste Operations and Emergency Response (Cal. Code Regs., tit. 8, section 5192; 29 CFR 1910.120). On-site personnel are responsible for operating in accordance with all applicable regulations of the Occupational Safety and Health Administration (OSHA) outlined in the State General Industry and Construction Safety Orders (Cal. Code Regs., tit. 8) and Federal Construction Industry Standards (29 CFR 1910 and 29 CFR 1926), as well as other applicable federal, state, and local laws and regulations. All personnel shall operate in compliance with all California OSHA requirements. A site-specific HASP will be developed and presented in the implementation work plan. The HASP will consider potential adverse effects on nearby receptors during excavation, and will present air monitoring protocols to mitigate these potential adverse effects. The HASP will identify COPCs and air monitoring action levels. The HASP will be kept on-site during all phases of the work and reviewed twice daily by project staff during tailgate health and safety meetings. The provisions of the HASP are mandatory for all project personnel. PG&E’s contractor and its subcontractors doing fieldwork in association with this RAW will either adopt and abide by the HASP or shall develop their own safety plans which, at a minimum, meet the requirements of the HASP. All on-site personnel shall read the HASP and sign the “Plan Acceptance Form.”

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT References July 11, 2012


11.0 References

American Society for Testing and Materials or ASTM standard D 1557. 2007. City of Lodi, 2006. Reynolds Ranch Draft Environmental Impact Report. City of Lodi Water Pollution Control Facility, 2006. Groundwater Investigation Existing Conditions Report.

October. Craig Communications, 2008. Public Participation Plan, Former Lodi Manufactured Gas Plant, 712 South

Sacramento Street, Lodi, California. October. Department of Toxic Substances Control (DTSC), 2001a. Guidance for Developing Transportation Plans

for Removal or Remedial Actions (Interim Final). December 5.

Department of Toxic Substances Control (DTSC), 2001b. Information Advisory – Clean Imported Fill Material. October.

Garcia and Associates (GANDA). Final Historical Resources Evaluation Report for the Pacific Gas and Electric Lodi Former Manufactured Gas Plant General Shop and Store Room/Meter House Building, Lodi, San Joaquin County, California. September 2007.

Iris Environmental, 2011. Draft Human Health Risk Assessment, PG&E Former Lodi Manufactured Gas

Plant, Lodi, California. March. Regional Water Quality Control Board, 2008. Screening for Environmental Concerns at Sites with

Contaminated Soil and Groundwater. Interim Final, May. Stantec Consulting Services Inc. (Stantec), 2009a. Well Destruction Report. August 13. Stantec, 2010a. Remedial Investigation Completion Report. June 8. Stantec, 2010b. Revised Remedial Refinement Work Plan. June 11. Stantec, 2010c. Results of Soil Vapor Extraction Pilot Testing. October 29. Stantec, 2010d. Notice of Action – Soil Vapor Extraction Pilot Testing. June 16. Treadwell & Rolo. Report of Third Quarter 2007 Groundwater Monitoring. January 8, 2008.

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT References July 11, 2012


United States Environmental Protection Agency (USEPA), 1973. Processes, Procedures and Methods to Control Pollution Resulting From All Construction Activity. 430/9-73-007.

United States Environmental Protection Agency (USEPA), 2000. Test Methods for Evaluating Solid Waste, Physical/Chemical Methods (SW 846). November.

United States Environmental Protection Agency (USEPA), 2009. Regional Screening Levels. December.

WATCH Manual; California Joint Utility Traffic Control Committee 1996.

FINAL HUMAN HEALTH RISK ASSESSMENT / FEASIBILITY STUDY / REMOVAL ACTION WORKPLAN FORMER LODI MANUFACTURED GAS PLANT

FIGURES Human Health Risk Assessment / Feasibility Study / Removal Action

Workplan Former Lodi Manufactured Gas Plant

PN: 185702232 July 11, 2012


APPENDIX A Historical Soil, Groundwater, and Soil Gas Chemical

Data Human Health Risk Assessment / Feasibility Study / Removal Action


PN: 185702232 July 11, 2012

EPA Method 7471A

Sb As Ba Be Cd Cr Co Cu Pb Mo Ni Se Ag Tl V Zn Hgmg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg

SS-1 0 2/24/2006 <0.5 2 93.7 <0.2 <0.5 8.7 5.3 14.5 23.9 0.64 5.4 <0.5 0.58 <2 30.2 136 0.21SS-2 0 2/24/2006 0.97 1.3 55.2 <0.2 <0.5 6.7 2.1 26.4 24,800 <0.5 6.8 <0.5 0.38 <2 12.1 70.4 <0.1SS-3 0 2/24/2006 1.4 4.7 57.8 <0.2 0.50 4.6 1.8 24.1 451 <0.5 3.0 <0.5 0.24 7.8 7.8 47.1 0.23SS-4 0 2/24/2006 0.54 3.7 191 <0.2 <0.5 29.8 7.4 21.8 691 <0.5 16.7 <0.5 0.32 <2 45.2 289 <0.1SS-5 0 2/24/2006 <0.5 2.8 114 <0.2 <0.5 12.3 7 15.3 147 1.1 9.5 <0.5 0.39 <2 39.2 135 <0.1SS-6 0 2/24/2006 <0.5 2.5 59.8 <0.2 <0.5 17.3 6.5 12.4 3.2 0.77 16.6 <0.5 0.23 <2 37.5 21.6 <0.1SS-7 0 2/24/2006 49.6 9.2 132 <0.2 <0.5 12.5 7.9 48.4 1,400 1.4 103 <0.5 0.46 <2 154 145 <0.1SS-8 0 2/24/2006 26.7 7.5 104 <0.2 <0.5 14.2 6.9 180 2,320 1.6 76.4 <0.5 0.17 <2 58.7 140 0.11SS-9 0 2/24/2006 <0.5 3.2 106 0.21 <0.5 16.1 6.4 19.9 165 1.1 14.0 <0.5 0.23 <2 40.7 63.7 <0.1

SB-1-0' 0 10/15/2008 <0.75 2.18 84.5 <0.25 <0.50 10.5 4.49 9.18 39.3 <0.25 4.58 <0.75 <0.25 <0.75 22.2 384 <0.0835SB-1-3' 3 10/15/2008 <0.75 <0.75 75.4 0.268 <0.50 6.26 5.12 6.49 5.55 <0.25 4.19 <0.75 <0.25 <0.75 23.1 24.6 <0.0835SB-1-6' 6 10/15/2008 <0.75 <0.75 57.1 <0.25 <0.50 4.86 4.51 4.81 1.93 <0.25 3.48 <0.75 <0.25 <0.75 20.7 19.9 <0.0835SB-1-9' 9 10/15/2008 <0.75 6.03 96.3 0.424 <0.50 8.33 9.19 9.49 3.56 <0.25 7.38 <0.75 <0.25 <0.75 48.3 36.8 <0.0835SB-2-0' 0 10/15/2008 <0.75 <0.75 103 0.267 <0.50 6.16 5.53 7.07 2.64 <0.25 4.60 <0.75 <0.25 <0.75 23.6 25.9 <0.0835

SB-2-0' (DUP-6) 0 10/15/2008 <0.75 0.807 109 0.268 <0.50 6.01 5.85 7.63 2.76 <0.25 4.57 <0.75 <0.25 <0.75 22.9 27.4 <0.0835SB-2-3' 3 10/15/2008 <0.75 1.19 85.3 0.300 <0.50 7.11 5.16 7.15 2.22 <0.25 5.17 <0.75 <0.25 <0.75 26.5 29.9 <0.0835SB-2-6' 6 10/15/2008 <0.75 0.904 55.6 <0.25 <0.50 5.87 4.18 6.50 1.82 <0.25 3.72 <0.75 <0.25 <0.75 22.7 24.6 <0.0835SB-2-9' 9 10/15/2008 <0.75 1.97 76.2 0.263 <0.50 6.58 4.93 6.97 1.79 <0.25 7.05 <0.75 <0.25 <0.75 26.8 23.8 <0.0835SB-3-0' 0 10/14/2008 <0.75 <0.75 23.0 <0.25 <0.50 2.66 2.13 5.47 1.96 <0.25 2.99 <0.75 <0.25 <0.75 12.6 112 0.127SB-3-3' 3 10/14/2008 <0.75 1.48 97.0 <0.25 <0.50 6.32 4.86 12.9 53.1 <0.25 7.37 <0.75 <0.25 <0.75 22.1 63.9 0.111SB-3-6' 6 10/14/2008 <0.75 1.27 71.0 <0.25 <0.50 5.52 4.84 9.34 22.1 <0.25 5.66 <0.75 <0.25 <0.75 21.2 44.9 <0.0835SB-3-9' 9 10/14/2008 <0.75 <0.75 30.9 <0.25 <0.50 3.60 3.72 5.63 2.0 <0.25 3.48 <0.75 <0.25 <0.75 14.7 109 <0.0835

SB-3-9' (DUP-3) 9 10/14/2008 <0.75 2.08 82.7 <0.25 <0.50 7.07 4.91 10.5 13.4 <0.25 6.05 <0.75 <0.25 <0.75 25.9 34.8 <0.0835SB-4-0' 0 10/14/2008 <0.75 1.17 63.3 <0.25 <0.50 5.97 4.44 7.39 14.9 <0.25 4.90 <0.75 <0.25 <0.75 19.5 34.9 <0.0835SB-4-3' 3 10/14/2008 <0.75 1.29 83.7 0.251 <0.50 9.60 5.02 11.7 64.9 <0.25 15 <0.75 <0.25 <0.75 22.8 66.1 <0.0835SB-4-6' 6 10/14/2008 <0.75 1.23 81.6 0.274 <0.50 6.85 6.68 9.86 24.8 <0.25 11.1 <0.75 <0.25 <0.75 24.4 56.3 <0.0835SB-4-7' 7 10/14/2008 <0.75 2.19 119 0.282 <0.50 6.64 4.12 40.5 783 <0.25 14 <0.75 <0.25 <0.75 35.9 56.8 <0.0835SB-4-9' 9 10/14/2008 <0.75 <0.75 40.0 <0.25 <0.50 4.29 6.96 3.79 1.8 0.33 4.02 <0.75 <0.25 <0.75 17.9 26.6 <0.0835SB-5-0' 0 10/15/2008 14.7 5.36 126 0.504 0.738 10.2 6.71 20.2 1,100 <0.25 51.1 <0.75 <0.25 <0.75 54.9 191 0.140SB-5-6' 6 10/15/2008 <0.75 1.83 69.2 0.321 <0.5 7.11 5.38 6.99 2.24 <0.25 5.61 <0.75 <0.25 <0.75 32.0 33.9 <0.0835SB-5-9' 9 10/15/2008 <0.75 1.39 96.7 0.287 <0.5 7.19 6.25 8.06 2.72 <0.25 4.96 <0.75 <0.25 <0.75 28.2 44.0 <0.0835

SB-6-7.5' 7.5 10/14/2008 <0.75 0.858 49.9 0.41 0.602 5.02 6.62 30.3 12.2 0.625 194 <0.75 <0.25 <0.75 103 54.6 <0.0835SB-6-9.5' 9.5 10/14/2008 <0.75 <0.75 38.4 <0.25 <0.50 1.54 0.618 2.22 26.6 <0.25 18.6 <0.75 <0.25 <0.75 16.3 20.8 <0.0835SB-6-12.5' 12.5 10/14/2008 <0.75 1.18 57.6 <0.25 <0.50 6.43 1.74 3.65 93.2 <0.25 9.31 <0.75 <0.25 <0.75 9.07 29.2 0.0930

SB-7-0' 0 10/15/2008 0.765 2.37 119 <0.25 <0.50 7.08 3.57 25.9 988 <0.25 14.3 <0.75 <0.25 <0.75 28.3 121 0.146SB-7-3' 3 10/15/2008 <0.75 1.91 92.40 0.361 <0.50 8.47 6.26 8.32 31.9 <0.25 6.62 <0.75 <0.25 <0.75 32.0 43.5 <0.0835SB-7-6' 6 10/15/2008 <0.75 1.99 116.0 0.309 <0.50 13.1 7.36 13.5 227 <0.25 9.52 <0.75 <0.25 <0.75 34.4 72.9 <0.0835

SB-7-6' (DUP-4) 6 10/15/2008 <0.75 2.33 93.7 0.394 <0.50 8.92 15.8 8.87 26.5 <0.25 8.39 <0.75 <0.25 <0.75 33.6 54.8 <0.0835SB-7-9' 9 10/15/2008 <0.75 6.79 148 0.412 <0.50 7.77 10.6 11.6 4.14 <0.25 9.09 <0.75 <0.25 <0.75 51.5 45.4 <0.0835SB-8-0' 0 10/15/2008 <0.75 <0.75 67.2 <0.25 <0.50 5.47 3.39 5.44 3.30 <0.25 3.94 <0.75 <0.25 <0.75 18.1 24.0 <0.0835SB-8-3' 3 10/15/2008 <0.75 <0.75 82.9 <0.25 <0.50 5.92 8.30 10.5 3.99 <0.25 4.62 <0.75 0.396 <0.75 19.4 22.7 <0.0835

SB-8-5.5' 5.5 10/15/2008 4.81 5.66 84.9 <0.25 2.23 8.00 6.60 53.0 97.3 1.06 58.3 <0.75 <0.25 <0.75 24.8 574 <0.0835SB-8-6' 6 10/15/2008 <0.75 <0.75 97.7 <0.25 <0.50 7.30 5.12 4.40 2.54 <0.25 5.07 <0.75 <0.25 <0.75 37.4 72.6 <0.0835SB-8-9' 9 10/15/2008 <0.75 5.43 119 0.665 <0.50 17.60 7.94 11.0 5.60 <0.25 11.5 <0.75 <0.25 <0.75 50.3 38.4 <0.0835SB-9-0' 0 10/13/2008 2.00 3.49 107 0.317 0.542 11.20 6.43 20.3 153 <0.25 14.4 <0.75 <0.25 <0.75 33.7 119 <0.0835

Historical Soil Chemical Data - MetalsTABLE A-1

Pacific Gas and Electric Company Former Lodi Manufactured Gas Plant Site712 S. Sacramento Street, Lodi, California

EPA Method 6010BSample ID Depth

(feet) Date

app a_Historical Data_Lodi MGP.xlsx/A1 1 of 7 4/19/2011

EPA Method 7471A





(feet) Date

SB-9-3' 3 10/13/2008 <0.75 1.97 116 0.343 <0.50 7.25 6.48 8.64 13.1 <0.25 5.67 <0.75 <0.25 <0.75 30.6 39.1 <0.0835SB-9-3' (DUP-1) 3 10/13/2008 <0.75 1.80 106 0.376 <0.50 7.53 7.18 8.66 4.26 <0.25 5.64 <0.75 <0.25 <0.75 32.7 33.6 <0.0835

SB-9-6' 6 10/13/2008 <0.75 1.93 107 0.330 <0.50 7.41 6.51 8.87 6.93 <0.25 5.61 <0.75 <0.25 <0.75 32.8 37.0 <0.0835SB-9-9' 9 10/13/2008 <0.75 1.23 55.8 <0.25 <0.50 3.91 4.07 5.67 2.36 <0.25 2.95 <0.75 <0.25 <0.75 20.7 20.2 <0.0835

SB-9-9' (DUP-2) 9 10/13/2008 <0.75 2.29 135 0.394 3.35 9.32 7.46 10.6 3.79 <0.25 16.8 <0.75 <0.25 <0.75 38.4 49.4 <0.0835SB-10-1.5' 1.5 10/15/2008 <0.75 1.21 88.3 <0.25 <0.50 3.71 139 123 56.6 <0.25 12.3 <0.75 3.57 <0.75 13.7 46.4 <0.0835SB-10-3' 3 10/15/2008 <0.75 1.03 87.0 0.309 <0.50 6.56 16.7 17.0 9.40 <0.25 5.28 <0.75 <0.25 <0.75 27.6 27.2 <0.0835

SB-10-3' (DUP-5) 3 10/15/2008 <0.75 0.816 91.4 0.30 <0.50 6.45 7.30 9.06 4.57 <0.25 4.90 <0.75 <0.25 <0.75 28.4 27.5 <0.0835SB-10-6' 6 10/15/2008 <0.75 1.15 87.0 0.282 <0.50 6.67 7.29 7.26 2.79 <0.25 4.48 <0.75 <0.25 <0.75 30.8 25.2 <0.0835SB-10-9' 9 10/15/2008 <0.75 4.92 109 0.372 <0.50 8.43 8.56 11.6 3.42 <0.25 6.53 <0.75 <0.25 <0.75 44.4 41.0 <0.0835SB-11-0' 0 10/14/2008 <0.75 1.29 109 0.271 <0.50 11.7 4.29 11.2 101 <0.25 8.15 <0.75 <0.25 <0.75 24.0 56.2 <0.0835SB-11-3' 3 10/14/2008 <0.75 1.90 101 0.409 <0.50 8.06 4.82 13.5 4.70 <0.25 8.15 <0.75 <0.25 <0.75 63.5 39.2 <0.0835SB-11-6' 6 10/14/2008 <0.75 2.04 94.4 0.320 <0.50 8.42 4.82 9.92 3.62 <0.25 8.84 <0.75 <0.25 <0.75 36.9 31.2 <0.0835SB-11-9' 9 10/14/2008 <0.75 0.893 45.1 <0.25 <0.50 7.43 4.28 6.60 2.42 <0.25 48.9 <0.75 <0.25 <0.75 20.3 23.6 <0.0835SB-11-15' 15 10/14/2008 <0.75 1.86 65.6 <0.25 <0.50 5.06 3.77 4.06 1.47 <0.25 2.87 <0.75 <0.25 <0.75 21.5 19.8 <0.0835SB-12-0' 0 10/14/2008 <0.75 1.38 110 0.265 <0.50 8.54 5.29 13.9 99.2 <0.25 8.71 <0.75 <0.25 <0.75 22.8 83.5 <0.0835

SB-12-1.5' 1.5 10/14/2008 <0.75 1.94 81.8 0.254 <0.50 6.06 6.11 4.97 2.48 <0.25 5.46 <0.75 <0.25 <0.75 24.8 28.1 <0.0835SB-12-3' 3 10/14/2008 2.03 2.82 123 0.306 <0.50 6.37 4.86 25.6 383 0.262 28.4 <0.75 <0.25 <0.75 46.8 86.7 <0.0835SB-12-6' 6 10/14/2008 <0.75 1.75 101 0.379 <0.50 8.43 4.77 24.1 54 <0.25 52.4 <0.75 <0.25 <0.75 47.5 82.0 0.128SB-12-9' 9 10/14/2008 <0.75 1.50 96.7 0.291 <0.50 8.28 5.09 9.33 7.67 <0.25 14.2 <0.75 <0.25 <0.75 38.7 40.4 <0.0835SB-12-12' 12 10/14/2008 <0.75 1.60 60.3 0.323 <0.50 10.5 7.03 8.96 3.54 <0.25 9.3 <0.75 <0.25 <0.75 28.4 24.6 <0.0835SB-12-15' 15 10/14/2008 <0.75 4.11 73.2 0.413 <0.50 10.0 6.01 6.51 4.43 <0.25 7.40 <0.75 <0.25 <0.75 46.3 32.4 <0.0835SB-13-0' 0 10/13/2008 2.40 3.61 146 <0.25 <0.50 6.37 3.22 16.5 386 <0.25 9.31 <0.75 <0.25 <0.75 25.4 102 0.389SB-13-3' 3 10/13/2008 <0.75 1.75 109 <0.25 <0.50 7.04 4.45 9.84 116 <0.25 5.31 <0.75 <0.25 <0.75 25.6 51.7 <0.0835SB-13-6' 6 10/13/2008 <0.75 1.55 87.4 <0.25 <0.50 5.86 3.25 10.1 46.6 <0.25 10.4 <0.75 <0.25 <0.75 31.7 41.4 <0.0835SB-13-9' 9 10/13/2008 <0.75 2.42 95.8 0.302 <0.50 9.47 9.04 9.61 3.36 <0.25 7.09 <0.75 <0.25 <0.75 29.4 30.1 <0.0835SB-14-0' 0 10/13/2008 <0.75 3.07 137 0.324 0.713 10.9 7.02 27.0 145 <0.25 15.7 <0.75 <0.25 <0.75 27.9 122 <0.0835SB-14-2' 2 10/13/2008 <0.75 2.30 96.2 <0.25 <0.50 7.64 3.95 23.2 143 <0.25 12.3 <0.75 <0.25 <0.75 23.8 61.3 <0.0835SB-14-3' 3 10/13/2008 <0.75 2.26 123 0.379 <0.50 8.39 7.32 11.9 37.9 <0.25 9.01 <0.75 <0.25 <0.75 32.6 51.1 <0.0835SB-14-6' 6 10/13/2008 <0.75 2.26 104 0.318 <0.50 6.90 7.06 8.13 10.1 <0.25 5.79 <0.75 <0.25 <0.75 32.0 31.7 <0.0835SB-14-9' 9 10/13/2008 <0.75 2.21 45.6 0.261 <0.50 8.59 4.54 8.40 2.58 <0.25 7.51 <0.75 <0.25 <0.75 24.8 21.5 <0.0835SB-15-0' 0 10/13/2008 <0.75 2.31 106 0.266 <0.50 8.86 5.49 20.0 261 <0.25 14.2 <0.75 <0.25 <0.75 25.3 106 <0.0835SB-15-3' 3 10/13/2008 <0.75 2.07 104 0.297 <0.50 8.24 5.49 13.0 55.3 <0.25 8.14 <0.75 <0.25 <0.75 26.5 50.1 <0.0835SB-15-6' 6 10/13/2008 <0.75 2.63 124 0.445 <0.50 8.60 7.98 10.7 27.3 <0.25 8.08 <0.75 <0.25 <0.75 37.7 45.3 <0.0835SB-15-9' 9 10/13/2008 <0.75 0.935 35.2 <0.25 <0.50 2.43 2.53 3.29 1.09 <0.25 2.06 <0.75 <0.25 <0.75 11.5 12.7 <0.0835SB-16-1' 1 10/13/2008 <0.75 2.31 267 0.261 <0.50 9.27 4.26 49.9 371 <0.25 8.64 <0.75 <0.25 <0.75 26.6 73.0 <0.0835SB-16-3' 3 10/13/2008 <0.75 0.923 61.8 <0.25 <0.50 4.57 3.63 6.60 32.0 <0.25 3.62 <0.75 <0.25 <0.75 16.1 21.4 <0.0835SB-16-6' 6 10/13/2008 <0.75 2.63 131 0.369 <0.50 8.23 6.94 8.67 4.87 <0.25 6.56 <0.75 <0.25 <0.75 36.9 35.0 <0.0835SB-16-9' 9 10/13/2008 <0.75 4.10 95.8 0.306 <0.50 6.03 7.76 8.49 3.14 <0.25 5.09 <0.75 <0.25 <0.75 37.0 39.6 <0.0835SB-17-1' 1 11/5/2009 <0.750 5.04 91.1 <0.250 <0.500 10.5 4.62 19.0 863 <0.250 16.4 <0.750 <0.250 <0.750 38.8 62.1 <0.0835SB-17-18' 18 11/6/2009 <0.750 5.18 81.5 <0.250 <0.500 13.0 6.89 6.50 10.1 <0.250 6.93 <0.750 <0.250 <0.750 33.4 28.1 <0.0835

SB-17-20.5' 20.5 11/6/2009 <0.750 1.70 81.0 <0.250 <0.500 11.4 5.62 8.16 2.00 <0.250 8.16 <0.750 <0.250 <0.750 28.4 17.8 <0.0835SB-17-25.5' 25.5 11/6/2009 <0.750 1.61 112 <0.250 <0.500 5.88 5.49 5.54 1.45 <0.250 5.07 <0.750 <0.250 <0.750 22.3 33.3 <0.0835

SB-18-0' 0 11/4/2009 <0.750 2.80 91.0 <0.250 <0.500 2.74 1.53 55.6 268 0.988 8.70 <0.750 0.473 <0.750 8.44 30.4 0.144SB-18-8' 8 11/4/2009 <0.750 3.54 153 0.271 <0.500 11.0 9.19 8.86 3.42 <0.250 9.52 <0.750 <0.250 <0.750 40.7 47.8 0.0133 J


EPA Method 7471A





(feet) Date

SB-18-16' 16 11/4/2009 <0.750 8.67 96.5 0.305 <0.500 19.2 10.0 12.9 4.25 <0.250 14.9 <0.750 <0.250 <0.750 38.8 24.6 0.0242 JSB-18-26' 26 11/4/2009 <0.750 3.12 212 0.427 <0.500 16.3 11.3 14.8 5.62 <0.250 11.8 <0.750 <0.250 <0.750 49.3 72.5 0.0230 J

SB-18-26' (DUP-1) 26 11/4/2009 <0.750 5.54 148 0.209 J <0.500 7.44 8.50 10.3 3.03 0.328 6.23 <0.750 <0.250 <0.750 47.8 48.2 0.0134 JSB-18-65' 65 11/4/2009 <0.750 3.08 82.9 0.320 <0.500 14.8 7.33 9.24 3.63 <0.250 14.9 <0.750 <0.250 <0.750 33.1 25.5 <0.0835SB-19-5' 5 11/5/2009 <0.750 2.68 96.5 <0.250 <0.500 7.10 9.37 5.50 1.99 <0.250 6.78 <0.750 <0.250 <0.750 32.3 41.4 <0.0835

SB-19-15.5 15.5 11/5/2009 <0.750 8.47 144 <0.250 <0.500 8.79 11.8 7.88 3.14 <0.250 11.3 <0.750 <0.250 <0.750 41.8 46.5 <0.0835SB-19-21' 21 11/5/2009 <0.750 2.34 60.1 <0.250 <0.500 10.3 5.24 4.19 2.23 <0.250 5.38 <0.750 <0.250 <0.750 22.4 17.7 <0.0835SB-19-28' 28 11/5/2009 <0.750 2.19 137 0.336 <0.500 12.3 9.90 9.97 3.79 <0.250 8.95 <0.750 <0.250 <0.750 38.4 44.2 <0.0835SB-20-0' 0 11/4/2009 <0.750 2.90 131 <0.250 <0.500 8.78 5.91 19.9 90.6 <0.250 10.6 <0.750 <0.250 <0.750 32.3 66.1 0.107SB-20-14' 14 11/5/2009 <0.750 6.42 67.6 0.361 <0.500 20.2 6.27 12.5 4.12 <0.250 12.1 <0.750 <0.250 <0.750 49.7 23.4 <0.0835SB-20-20' 20 11/5/2009 <0.750 2.46 83.1 <0.250 <0.500 11.8 6.19 6.46 2.25 <0.250 7.12 <0.750 <0.250 <0.750 30.1 18.1 <0.0835

SB-20-66.5' 66.5 11/5/2009 <0.750 1.49 36.3 <0.250 <0.500 3.52 2.72 2.28 0.908 <0.250 3.31 <0.750 <0.250 <0.750 14.5 10.2 <0.0835SB-20-66.5' (DUP-4) 66.5 11/5/2009 <0.750 5.73 152 0.470 <0.500 18.3 10.9 9.36 5.23 <0.250 16.3 <0.750 <0.250 <0.750 56.9 34.4 <0.0835

SB-21-0' 0 11/3/2009 <0.750 8.46 110 0.183 J 0.173 J 10.2 6.20 20.5 77.8 <0.250 10.1 <0.750 <0.250 <0.750 23.8 168 0.0284 JSB-21-5' 5 11/2/2009 <0.750 2.85 87.6 0.157 J <0.500 6.73 6.29 5.68 1.93 <0.250 4.60 <0.750 <0.250 <0.750 29.4 35.2 0.0412 JSB-21-10' 10 11/2/2009 <0.750 4.54 99.4 0.213 J <0.500 7.59 7.23 6.92 2.86 0.100 J 5.28 <0.750 <0.250 <0.750 33.5 45.8 0.00895 JSB-22-0' 0 11/2/2009 <0.750 2.88 146 0.226 J <0.500 8.23 6.82 12.1 323 <0.250 8.05 <0.750 <0.250 <0.750 29.6 73.1 0.0332 JSB-22-5' 5 11/2/2009 <0.750 2.70 92.1 0.164 J <0.500 7.19 6.62 5.64 2.27 <0.250 4.82 <0.750 <0.250 <0.750 30.8 38.9 0.00795 JSB-22-10' 10 11/2/2009 <0.750 6.09 210 0.330 <0.500 13.6 11.5 11.6 4.50 <0.250 11.9 <0.750 <0.250 <0.750 44.7 76.0 0.0125 JSB-23-0' 0 11/2/2009 <0.750 7.16 145 0.159 <0.500 13.7 5.15 91.5 1,340 0.153 J 60.0 <0.750 <0.250 <0.750 100 92.4 2.77SB-23-10' 10 11/2/2009 <0.750 4.48 74.9 0.223 J <0.500 9.90 4.23 5.04 2.51 <0.250 8.26 <0.750 <0.250 <0.750 30.5 51.4 0.00635 JSB-23-12' 12 11/2/2009 0.923 4.75 133 0.166 <0.500 21.7 4.11 56.6 1,100 1.71 22.3 <0.750 <0.250 <0.750 40.8 99.3 1.06SB-23-15' 15 11/2/2009 <0.750 1.41 88.7 0.186 J <0.500 9.23 5.57 5.73 3.02 <0.250 6.25 <0.750 <0.250 <0.750 25.4 40.7 0.0120 JSB-24-0' 0 11/2/2009 <0.750 2.45 82.3 0.201 J <0.500 12.4 6.79 11.3 12.3 <0.250 11.5 <0.750 <0.250 <0.750 29.1 51.3 0.00925 JSB-24-5' 5 11/2/2009 <0.750 3.59 139 0.249 J <0.500 9.82 8.89 9.20 3.20 <0.25 6.98 <0.750 <0.250 <0.750 42.7 48.9 0.00735 JSB-24-10' 10 11/2/2009 <0.750 5.73 99.0 0.256 <0.500 12.3 6.58 8.56 3.93 0.252 9.90 <0.750 <0.250 <0.750 38.2 40.7 0.0175 JSB-25-0' 0 11/2/2009 <0.750 4.56 114 0.184 J <0.500 9.76 5.93 24.5 180 <0.250 13.2 <0.750 <0.250 <0.750 29.0 121 <0.0399 JSB-25-5' 5 11/2/2009 <0.750 3.72 193 0.258 <0.500 9.10 7.72 8.02 2.90 <0.250 6.63 <0.750 <0.250 <0.750 42.6 49.2 0.00967 JSB-25-10' 10 11/2/2009 <0.750 2.53 67.0 0.105 J <0.500 4.25 3.62 5.96 1.64 <0.250 3.23 <0.750 <0.250 <0.750 20.9 34.1 0.00835 JSB-26-0.5' 0.5 11/5/2009 <0.750 1.41 81.9 <0.250 <0.500 4.73 4.40 5.84 6.03 <0.250 3.86 <0.750 <0.250 <0.750 16.7 24.8 <0.0835SB-26-5' 5 11/5/2009 <0.750 2.32 48.9 <0.250 <0.500 5.78 5.01 4.61 1.81 <0.250 3.57 <0.750 <0.250 <0.750 25.2 16.5 <0.0835SB-26-15' 15 11/5/2009 <0.750 8.82 79.4 <0.250 <0.500 5.68 5.83 4.42 1.83 <0.250 4.13 <0.750 <0.250 <0.750 27.8 23.5 <0.0835SB-27-0.5' 0.5 11/5/2009 <0.750 1.92 101 <0.250 <0.500 5.51 6.11 7.10 52.1 <0.250 10.6 <0.750 <0.250 <0.750 20.4 47.0 <0.0835SB-27-5' 5 11/5/2009 <0.750 1.42 36.9 <0.250 <0.500 5.24 4.09 3.91 3.41 <0.250 3.30 <0.750 <0.250 <0.750 21.4 17.6 <0.0835

SB-27-10' (DUP-5) 10 11/5/2009 <0.750 1.42 36.7 <0.250 <0.500 3.28 3.71 3.75 1.25 <0.250 2.51 <0.750 <0.250 <0.750 16.5 15.5 <0.0835SB-27-15' 15 11/5/2009 <0.750 4.92 57.8 <0.250 <0.500 5.76 5.23 4.56 1.83 <0.250 4.46 <0.750 <0.250 <0.750 27.6 22.1 <0.0835SB-28-0.5' 0.5 11/5/2009 <0.750 1.39 95.5 <0.250 <0.500 6.65 4.93 8.99 52.1 <0.250 6.43 <0.750 <0.250 <0.750 21.7 50.2 <0.0835SB-28-8' 8 11/5/2009 <0.750 2.82 54.1 <0.250 <0.500 10.2 5.16 5.14 3.97 0.785 4.82 <0.750 <0.250 <0.750 26.7 19.8 <0.0835SB-28-15' 15 11/5/2009 <0.750 3.48 72.8 0.301 <0.500 16.3 7.09 6.29 3.28 <0.250 9.36 <0.750 <0.250 <0.750 45.3 33.4 <0.0835SB-29-0.5' 0.5 11/4/2009 <0.750 2.07 102 <0.250 <0.500 6.97 5.44 8.48 29.5 <0.250 7.81 <0.750 <0.250 <0.750 23.8 51.4 <0.0835SB-29-5' 5 11/4/2009 <0.750 2.42 63.1 <0.250 <0.500 6.50 4.73 4.92 1.93 <0.250 4.08 <0.750 <0.250 <0.750 32.0 22.3 <0.0835SB-29-10' 10 11/4/2009 <0.750 1.72 65.9 <0.250 <0.500 13.3 8.12 8.43 2.61 <0.250 11.0 <0.750 <0.250 <0.750 30.1 25.8 <0.0835SB-29-13' 13 11/4/2009 <0.750 2.76 71.5 <0.250 <0.500 11.1 8.85 6.38 3.39 <0.250 8.49 <0.750 <0.250 <0.750 30.6 26.8 <0.0835SB-30-0.5' 0.5 11/4/2009 <0.750 1.78 133 <0.250 <0.500 8.35 6.19 12.0 57.2 <0.250 7.61 <0.750 <0.250 <0.750 28.9 97.0 <0.0835


EPA Method 7471A





(feet) Date

SB-30-5' 5 11/4/2009 <0.750 3.06 92.1 <0.250 <0.500 9.16 7.23 7.49 2.67 <0.250 6.11 <0.750 <0.250 <0.750 37.3 29.5 <0.0835SB-30-5' (DUP-3) 5 11/4/2009 <0.750 2.36 88.3 <0.250 <0.500 8.40 7.15 7.25 2.62 <0.250 5.67 <0.750 <0.250 <0.750 37.6 28.9 <0.0835

SB-30-10' 10 11/4/2009 <0.750 3.83 73.9 0.274 <0.500 20.8 8.42 12.1 3.48 0.555 12.4 <0.750 <0.250 <0.750 40.7 33.1 <0.0835SB-30-13' 13 11/4/2009 <0.750 11.6 101 <0.250 <0.500 10.3 8.87 7.14 3.84 <0.250 8.54 <0.750 <0.250 <0.750 48.2 37.1 <0.0835SB-31-0.5' 0.5 11/4/2009 <0.750 1.89 114 <0.250 <0.500 6.88 5.87 7.14 7.18 <0.250 5.34 <0.750 <0.250 <0.750 25.8 32.9 <0.0835SB-31-5' 5 11/4/2009 <0.750 2.64 75.6 <0.250 <0.500 6.74 6.36 5.57 1.68 <0.250 4.21 <0.750 <0.250 <0.750 31.1 22.6 <0.0835SB-31-10' 10 11/4/2009 <0.750 3.13 92.4 0.264 <0.500 14.3 7.48 10.5 3.73 <0.250 11.0 <0.750 <0.250 <0.750 40.0 31.7 <0.0835SB-31-15' 15 11/4/2009 <0.750 11.6 69.7 <0.250 <0.500 4.00 3.99 3.22 0.602 <0.250 4.26 <0.750 <0.250 <0.750 33.2 15.8 <0.0835SB-32-0.5' 0.5 11/4/2009 <0.750 1.44 102 <0.250 <0.500 6.06 5.58 6.27 5.31 <0.250 4.70 <0.750 <0.250 <0.750 21.6 35.9 <0.0835SB-32-5' 5 11/4/2009 <0.750 3.28 97.1 <0.250 <0.500 9.04 7.22 7.21 4.60 <0.250 6.03 <0.750 <0.250 <0.750 36.2 31.0 <0.0835SB-32-10' 10 11/4/2009 <0.750 6.60 142 0.455 <0.500 18.9 11.6 12.9 5.27 <0.250 15.7 <0.750 <0.250 <0.750 52.4 42.2 <0.0835SB-32-15' 15 11/4/2009 <0.750 4.06 49.0 <0.250 <0.500 3.56 4.79 3.53 0.889 <0.250 4.01 <0.750 <0.250 <0.750 25.7 20.9 <0.0835SB-33-0.5' 0.5 11/4/2009 <0.750 3.72 136 <0.250 <0.500 15.8 5.29 20.2 80.7 0.315 23.3 <0.750 <0.250 <0.750 44.4 70.9 <0.0835SB-33-5' 5 11/4/2009 <0.750 3.35 104 <0.250 <0.500 7.76 7.10 6.72 2.39 <0.250 7.18 <0.750 <0.250 <0.750 38.6 38.5 <0.0835SB-33-10' 10 11/4/2009 <0.750 12.0 207 0.709 <0.500 17.4 17.5 11.2 6.70 <0.250 30.2 <0.750 <0.250 <0.750 62.2 99.2 <0.0835SB-33-15' 15 11/4/2009 <0.750 3.79 53.2 <0.250 <0.500 6.39 4.93 4.51 1.23 <0.250 5.01 <0.750 <0.250 <0.750 32.3 23.6 <0.0835SB-34-0' 0 11/3/2009 <0.750 4.51 112 0.172 J <0.500 12.1 5.54 17.8 207 0.103 J 14.6 <0.750 <0.250 <0.750 27.2 115 0.0436 JSB-34-8' 8 11/3/2009 <0.750 2.87 116 0.168 J <0.500 8.53 4.96 10.8 2.41 0.239 J 6.07 <0.750 <0.250 <0.750 36.2 48.6 0.0205 JSB-34-12' 12 11/3/2009 <0.750 1.75 62.5 <0.250 <0.500 3.63 3.11 4.08 1.24 <0.250 2.67 <0.750 <0.250 <0.750 20.5 32.5 0.00985 J

SB-34-12' (DUP-2) 12 11/3/2009 <0.750 1.36 39.1 <0.250 <0.500 3.87 3.15 3.86 1.42 <0.250 3.02 <0.750 <0.250 <0.750 20.2 21.2 0.00661 JSB-35-0' 0 11/9/2009 <0.750 3.27 104 <0.250 <0.500 7.82 5.65 17.9 129 <0.250 12.5 <0.750 <0.250 <0.750 24.7 148 <0.0835SB-35-3' 3 11/9/2009 <0.750 3.00 97.9 <0.250 <0.500 7.67 6.74 7.61 3.39 <0.250 5.66 <0.750 <0.250 <0.750 31.9 40.7 <0.0835SB-35-6' 6 11/9/2009 <0.750 3.93 77.9 <0.250 <0.500 7.14 6.40 7.08 2.50 <0.250 8.13 <0.750 <0.250 <0.750 34.0 28.1 <0.0835SB-35-9' 9 11/9/2009 <0.750 4.86 84.6 <0.250 <0.500 13.2 7.44 10.7 3.31 0.375 10.5 <0.750 <0.250 <0.750 33.4 29.4 <0.0835

SB-36-0' 0 11/9/2009 <0.750 3.76 80.8 <0.250 <0.500 33.8 7.67 114 45.3 7.84 603 <0.750 <0.250 <0.750 20.9 90.0 <0.0835SB-36-3' 3 11/9/2009 <0.750 4.36 106 0.288 <0.500 31.1 8.34 12.2 9.31 4.28 19.0 <0.750 <0.250 <0.750 35.2 55.5 <0.0835SB-36-6' 6 11/9/2009 <0.750 3.21 108 <0.250 <0.500 8.80 7.71 7.59 3.24 <0.250 7.47 <0.750 <0.250 <0.750 37.3 31.6 <0.0835SB-36-9' 9 11/9/2009 <0.750 4.34 108 0.302 <0.500 15.8 9.42 12.2 3.46 0.336 9.94 <0.750 <0.250 <0.750 47.4 38.6 <0.0835

SB-37-0' 0 11/9/2009 <0.750 1.43 24.8 <0.250 <0.500 10.9 2.55 16.2 7.66 2.19 559 <0.750 <0.250 <0.750 8.50 16.0 <0.0835SB-37-3' 3 11/9/2009 <0.750 3.14 147 0.273 <0.500 8.74 8.23 11.2 12.6 <0.250 54.9 <0.750 <0.250 <0.750 34.5 74.6 <0.0835SB-37-6' 6 11/9/2009 <0.750 4.47 150 0.296 <0.500 10.0 9.06 9.45 4.04 <0.250 15.6 <0.750 <0.250 <0.750 46.0 41.9 <0.0835SB-37-9' 9 11/9/2009 <0.750 4.17 59.5 <0.250 <0.500 11.8 6.11 8.86 2.77 <0.250 9.33 <0.750 <0.250 <0.750 32.9 24.9 <0.0835

SB-38-0' 0 11/9/2009 <0.750 6.35 42.1 <0.250 <0.500 12.6 3.45 34.4 53.2 22.2 32.0 <0.750 <0.250 <0.750 9.78 70.9 <0.0835SB-38-3' 3 11/9/2009 <0.750 3.71 120 0.278 <0.500 8.34 7.74 9.43 6.66 <0.250 12.0 <0.750 <0.250 <0.750 33.9 42.6 <0.0835SB-38-6' 6 11/9/2009 <0.750 4.42 152 0.312 <0.500 11.1 10.0 9.62 3.82 <0.250 7.60 <0.750 <0.250 <0.750 53.1 39.8 <0.0835SB-38-9' 9 11/9/2009 <0.750 2.94 87.6 <0.250 <0.500 7.12 6.43 7.56 2.65 <0.250 5.89 <0.750 <0.250 <0.750 32.7 33.0 <0.0835

SB-39-0' 0 11/9/2009 <0.750 3.14 63.5 <0.250 <0.500 30.2 4.71 28.1 25.9 6.64 291 <0.750 <0.250 <0.750 17.6 56.4 <0.0835SB-39-3' 3 11/9/2009 <0.750 2.95 90.0 <0.250 <0.500 8.81 6.46 7.81 3.34 <0.250 24.7 <0.750 <0.250 <0.750 29.8 28.0 <0.0835SB-39-6' 6 11/9/2009 <0.750 3.79 80.7 <0.250 <0.500 7.75 7.62 6.32 2.74 <0.250 5.45 <0.750 <0.250 <0.750 36.5 26.3 <0.0835SB-39-9' 9 11/9/2009 <0.750 3.01 69.4 <0.250 <0.500 4.51 4.10 6.24 1.87 0.332 3.67 <0.750 <0.250 <0.750 19.1 37.9 <0.0835

SB-39-9' (DUP-6) 9 11/9/2009 <0.750 2.11 40.5 <0.250 <0.500 6.08 4.91 4.52 1.70 0.309 3.89 <0.750 <0.250 <0.750 22.1 19.1 <0.0835

SB-40-0' 0 11/10/2009 <0.750 3.93 106 <0.250 <0.500 15.8 6.20 49.9 70.9 0.890 13.4 <0.750 <0.250 <0.750 21.6 85.4 <0.0835SB-40-3' 3 11/10/2009 <0.750 2.74 88.5 <0.250 <0.500 7.64 6.83 9.74 250 0.938 6.47 <0.750 <0.250 <0.750 27.4 95.5 <0.0835SB-40-6' 6 11/10/2009 <0.750 2.53 94.0 <0.250 <0.500 6.77 6.85 6.17 3.44 <0.250 4.69 <0.750 <0.250 <0.750 29.9 26.3 <0.0835


EPA Method 7471A





(feet) Date

SB-40-9' 9 11/10/2009 <0.750 2.41 65.4 <0.250 <0.500 6.55 5.63 5.39 2.16 <0.250 4.14 <0.750 <0.250 <0.750 26.2 23.5 <0.0835

SB-41-0' 0 11/10/2009 <0.750 1.87 95.2 <0.250 <0.500 6.95 3.52 20.2 17.7 0.301 21.5 <0.750 <0.250 <0.750 13.4 33.8 <0.0835SB-41-3' 3 11/10/2009 <0.750 4.31 112 0.258 <0.500 8.76 8.11 7.99 3.72 <0.250 7.08 <0.750 <0.250 <0.750 37.0 34.0 <0.0835SB-41-6' 6 11/10/2009 <0.750 3.37 146 0.267 <0.500 8.10 8.36 7.78 3.62 <0.250 6.13 <0.750 <0.250 <0.750 38.1 34.7 <0.0835SB-41-9' 9 11/10/2009 <0.750 2.84 38.6 <0.250 <0.500 7.50 3.94 6.05 1.91 <0.250 6.57 <0.750 <0.250 <0.750 23.2 17.2 <0.0835

SB-42-0' 0 11/10/2009 <0.750 1.99 61.0 <0.250 <0.500 5.51 4.30 11.6 16.3 <0.250 5.56 <0.750 <0.250 <0.750 16.5 30.2 <0.0835SB-42-3' 3 11/10/2009 <0.750 2.70 100 <0.250 <0.500 6.64 6.73 6.78 3.43 <0.250 4.80 <0.750 <0.250 <0.750 29.3 28.2 <0.0835SB-42-6' 6 11/10/2009 <0.750 5.75 156 <0.250 <0.500 7.71 11.1 8.04 3.94 <0.250 6.26 <0.750 <0.250 <0.750 49.6 40.6 <0.0835SB-42-9' 9 11/10/2009 <0.750 3.12 48.8 <0.250 <0.500 8.38 5.53 8.00 2.42 <0.250 6.57 <0.750 <0.250 <0.750 25.5 20.7 <0.0835SB-43-0' 0 11/10/2009 <0.750 2.35 123 <0.250 <0.500 6.67 4.55 14.4 99.8 <0.250 10.1 <0.750 <0.250 <0.750 18.8 130 <0.0835SB-43-3' 3 11/10/2009 <0.750 2.45 88.8 <0.250 <0.500 7.16 6.71 6.97 3.77 <0.250 5.01 <0.750 <0.250 <0.750 28.6 37.2 <0.0835SB-43-6' 6 11/10/2009 <0.750 2.40 67.9 <0.250 <0.500 5.52 5.91 5.12 2.06 <0.250 7.56 <0.750 <0.250 <0.750 26.3 39.7 <0.0835SB-43-9' 9 11/10/2009 <0.750 4.26 77.4 <0.250 <0.500 8.67 6.22 7.79 2.71 <0.250 7.18 <0.750 <0.250 <0.750 30.9 23.9 <0.0835

SB-44-0' 0 11/10/2009 <0.750 3.87 74.1 <0.250 <0.500 39.1 10.7 106 36.0 9.70 4,330 <0.750 <0.250 <0.750 19.1 89.5 <0.0835SB-44-3' 3 11/10/2009 <0.750 3.84 84.3 <0.250 <0.500 14.5 9.58 35.7 15.3 3.57 115 <0.750 <0.250 <0.750 35.2 57.7 <0.0835SB-44-6' 6 11/10/2009 <0.750 4.26 138 0.360 <0.500 10.9 11.4 11.4 7.01 <0.250 14.6 <0.750 <0.250 <0.750 47.2 69.7 <0.0835SB-44-9' 9 11/10/2009 <0.750 1.98 52.8 <0.250 <0.500 6.34 5.33 5.11 1.88 <0.250 4.17 <0.750 <0.250 <0.750 23.9 22.2 <0.0835

SB-45-0' 0 11/10/2009 <0.750 1.44 40.4 <0.250 <0.500 4.61 2.69 9.93 13.8 0.413 81.6 <0.750 <0.250 <0.750 9.86 23.5 <0.0835SB-45-3' 3 11/10/2009 <0.750 3.11 136 0.275 <0.500 8.42 8.31 8.62 5.94 <0.250 10.8 <0.750 <0.250 <0.750 36.8 36.9 <0.0835SB-45-6' 6 11/10/2009 <0.750 1.97 77.2 <0.250 <0.500 4.61 4.90 4.55 1.68 <0.250 3.36 <0.750 <0.250 <0.750 21.3 20.7 <0.0835SB-45-9' 9 11/10/2009 <0.750 2.33 56.5 <0.250 <0.500 7.43 4.18 5.98 2.08 <0.250 5.80 <0.750 <0.250 <0.750 19.5 18.5 <0.0835

SB-46-0' 0 11/10/2009 <0.750 10.4 81.3 <0.250 <0.500 58.5 4.99 62.9 52.3 14.3 318 <0.750 <0.250 <0.750 14.8 85.3 <0.0835SB-46-3' 3 11/10/2009 <0.750 2.33 101 0.250 <0.500 7.12 6.92 6.87 3.92 <0.250 5.14 <0.750 <0.250 <0.750 31.5 29.7 <0.0835SB-46-6' 6 11/10/2009 <0.750 3.59 110 <0.250 <0.500 9.43 8.43 8.08 3.05 <0.250 6.06 <0.750 <0.250 <0.750 40.2 32.2 <0.0835SB-46-9' 9 11/10/2009 <0.750 1.61 37.2 <0.250 <0.500 3.83 3.71 4.18 1.47 <0.250 2.63 <0.750 <0.250 <0.750 16.5 16.6 <0.0835

SB-47-0.5' 0.5 7/15/2010 18.6 6.93 415 <0.250 <0.500 11.3 4.75 16.4 222 <0.250 9.56 <0.750 <0.250 <0.750 44.9 86.5 <0.0835SB-47-3' 3 7/15/2010 0.945 1.03 94.9 <0.250 <0.500 7.46 5.03 9.12 5.93 <0.250 4.86 <0.750 <0.250 <0.750 26.5 33.2 <0.0835SB-47-6' 6 7/15/2010 <0.750 1.59 61.9 <0.250 <0.500 5.96 5.88 5.12 2.42 <0.250 4.94 <0.750 <0.250 <0.750 26.9 34.6 <0.0835

SB-48-1.5' 1.5 7/13/2010 <0.750 0.913 92.6 <0.250 <0.500 6.02 19.7 8.52 24.6 <0.250 15.5 <0.750 <0.250 <0.750 30.1 34.5 <0.0835SB-48-3' 3 7/13/2010 <0.750 1.49 112 <0.250 <0.500 8.49 15.3 8.81 7.87 <0.250 7.67 <0.750 <0.250 <0.750 33.6 37.2 <0.0835SB-48-6' 6 7/13/2010 <0.750 2.22 119 <0.250 <0.500 7.99 6.83 7.37 3.38 <0.250 5.55 <0.750 <0.250 <0.750 35.2 36.6 <0.0835SB-49-3' 3 7/13/2010 <0.750 1.19 101 <0.250 <0.500 6.25 5.72 8.20 10.8 <0.250 17.0 <0.750 <0.250 <0.750 30.3 29.4 <0.0835SB-49-4' 4 7/13/2010 <0.750 1.29 86.0 <0.250 <0.500 6.43 6.17 11.7 86.2 <0.250 56.0 <0.750 <0.250 <0.750 56.8 32.8 <0.0835SB-49-6' 6 7/13/2010 <0.750 1.80 80.1 <0.250 <0.500 6.85 6.75 6.11 9.11 <0.250 8.51 <0.750 <0.250 <0.750 31.8 27.4 <0.0835

SB-50-1.5' 1.5 7/13/2010 <0.750 2.10 111 <0.250 <0.500 8.00 6.06 14.9 15.3 <0.250 17.8 <0.750 <0.250 <0.750 30.2 52.9 <0.0835SB-50-3' 3 7/13/2010 <0.750 2.80 97.8 <0.250 <0.500 8.30 8.49 8.32 3.12 <0.250 5.92 <0.750 <0.250 <0.750 36.3 29.3 <0.0835SB-50-6' 6 7/13/2010 <0.750 5.03 125 <0.250 <0.500 8.73 7.51 7.56 3.41 <0.250 5.74 <0.750 <0.250 <0.750 41.7 32.7 <0.0835

SB-51-1.5' 1.5 7/13/2010 <0.750 1.83 68.8 <0.250 <0.500 8.25 5.55 10.5 11.4 <0.250 36.0 <0.750 <0.250 <0.750 28.2 45.3 <0.0835SB-51-3' 3 7/13/2010 <0.750 2.15 124 <0.250 <0.500 8.35 6.57 9.58 6.70 <0.250 7.75 <0.750 <0.250 <0.750 29.7 33.5 <0.0835

SB-51-6.5' 6.5 7/13/2010 <0.750 1.63 61.7 <0.250 <0.500 6.98 5.13 9.81 15.1 <0.250 7.35 <0.750 <0.250 <0.750 20.4 124 <0.0835SB-51-9' 9 7/13/2010 <0.750 3.98 74.0 <0.250 <0.500 9.75 5.70 9.89 3.59 <0.250 7.26 <0.750 <0.250 <0.750 35.3 25.2 <0.0835SB-52-1' 1 7/12/2010 <0.750 1.18 88.2 <0.250 <0.500 5.99 5.20 6.21 6.78 <0.250 4.25 <0.750 <0.250 <0.750 23.2 25.2 <0.0835SB-52-3' 3 7/12/2010 <0.750 2.69 90.7 <0.250 <0.500 7.25 6.52 6.71 4.04 <0.250 4.98 <0.750 <0.250 <0.750 31.2 26.2 <0.0835SB-52-6' 6 7/12/2010 <0.750 2.30 79.4 <0.250 <0.500 7.22 6.85 6.38 2.63 <0.250 4.65 <0.750 <0.250 <0.750 35.9 24.2 <0.0835SB-52-9' 9 7/12/2010 <0.750 4.94 90.4 0.260 <0.500 12.9 6.43 12.3 4.41 <0.250 8.71 <0.750 <0.250 <0.750 40.8 31.1 <0.0835


EPA Method 7471A





(feet) Date

SB-52-15' 15 7/12/2010 <0.750 1.74 79.1 <0.250 <0.500 5.01 5.22 4.19 1.94 <0.250 3.82 <0.750 <0.250 <0.750 21.0 18.9 <0.0835SB-52-20' 20 7/12/2010 <0.750 3.84 56.5 <0.250 <0.500 10.9 5.21 5.58 3.39 <0.250 5.74 <0.750 <0.250 <0.750 32.6 21.9 <0.0835

SB-52-24.5' 24.5 7/12/2010 <0.750 3.18 129 0.422 <0.500 29.4 11.3 13.2 5.89 1.39 12.9 <0.750 <0.250 <0.750 54.1 48.8 <0.0835SB-53-0.5' 0.5 7/12/2010 <0.750 2.59 127 0.261 <0.500 10.4 8.73 13.2 39.1 <0.250 16.8 <0.750 <0.250 <0.750 39.7 109 <0.0835SB-53-3' 3 7/13/2010 <0.750 3.52 112 0.292 <0.500 11.1 9.03 8.78 5.92 <0.250 9.48 <0.750 <0.250 <0.750 44.1 46.2 <0.0835SB-53-6' 6 7/13/2010 <0.750 4.03 79.8 <0.250 <0.500 8.70 7.40 10.6 14.4 <0.250 7.40 <0.750 <0.250 <0.750 38.7 40.6 <0.0835SB-53-9' 9 7/13/2010 <0.750 4.47 104 <0.250 <0.500 10.9 7.99 8.67 4.04 <0.250 15.9 <0.750 <0.250 <0.750 34.8 55.2 <0.0835SB-53-15' 15 7/13/2010 <0.750 2.66 48.2 <0.250 <0.500 5.80 4.90 4.53 2.11 <0.250 4.54 <0.750 <0.250 <0.750 24.7 17.9 <0.0835

SB-53-20.5' 20.5 7/13/2010 <0.750 2.18 67.0 0.272 <0.500 15.4 7.23 5.71 2.27 <0.250 7.79 <0.750 <0.250 <0.750 34.3 15.2 <0.0835SB-53-25' 25 7/13/2010 <0.750 3.19 128 0.327 <0.500 13.1 9.63 8.55 4.35 <0.250 9.17 <0.750 <0.250 <0.750 46.1 34.1 <0.0835SB-54-1' 1 7/12/2010 <0.750 2.87 117 <0.250 <0.500 9.19 5.20 23.7 9.21 <0.250 7.47 <0.750 <0.250 <0.750 54.9 35.9 <0.0835SB-54-3' 3 7/12/2010 0.795 2.35 111 0.257 <0.500 8.79 7.15 11.6 7.95 <0.250 10.1 <0.750 <0.250 <0.750 40.2 50.2 <0.0835SB-54-6' 6 7/12/2010 <0.750 2.22 76.3 <0.250 <0.500 7.36 7.14 9.86 2.82 <0.250 6.94 <0.750 <0.250 <0.750 34.7 46.1 <0.0835SB-54-9' 9 7/12/2010 <0.750 3.44 137 <0.250 <0.500 8.38 9.87 11.0 4.75 <0.250 7.81 <0.750 <0.250 <0.750 46.2 43.7 <0.0835SB-54-15' 15 7/12/2010 1.06 3.75 125 0.292 <0.500 11.5 10.3 9.60 6.26 <0.250 10.5 <0.750 <0.250 <0.750 45.4 42.9 <0.0835SB-54-20' 20 7/12/2010 <0.750 5.48 77.4 0.313 <0.500 15.7 11.6 10.0 4.89 <0.250 11.8 <0.750 <0.250 <0.750 43.2 23.3 <0.0835SB-54-22' 22 7/12/2010 <0.750 1.77 103 0.330 <0.500 14.5 9.92 7.28 3.51 <0.250 9.84 <0.750 <0.250 <0.750 41.6 24.0 <0.0835SB-55-1.5' 1.5 7/13/2010 1.44 1.46 109 <0.250 <0.500 8.80 5.52 7.93 3.75 <0.250 5.07 <0.750 <0.250 <0.750 30.0 36.7 <0.0835SB-55-3' 3 7/13/2010 1.94 2.32 101 <0.250 <0.500 9.59 5.62 8.19 4.04 <0.250 5.22 <0.750 <0.250 <0.750 33.4 37.4 <0.0835SB-55-6' 6 7/13/2010 <0.750 3.23 101 <0.250 <0.500 13.4 9.81 9.61 3.47 0.767 8.03 <0.750 <0.250 <0.750 39.5 47.3 <0.0835SB-55-9' 9 7/13/2010 <0.750 1.06 52.9 <0.250 <0.500 7.93 3.86 6.67 2.75 <0.250 6.35 <0.750 <0.250 <0.750 22.7 24.3 <0.0835SB-55-15' 15 7/13/2010 <0.750 2.63 98.4 0.273 <0.500 10.7 7.46 8.17 4.07 <0.250 7.45 <0.750 <0.250 <0.750 35.5 35.3 <0.0835SB-55-20' 20 7/13/2010 0.798 0.984 58.0 <0.250 <0.500 11.0 4.50 4.39 2.34 <0.250 5.21 <0.750 <0.250 <0.750 26.8 12.2 <0.0835SB-55-25' 25 7/13/2010 <0.750 2.69 159 0.438 <0.500 17.7 16.4 11.5 6.20 <0.250 12.9 <0.750 <0.250 <0.750 52.6 39.9 <0.0835SB-56-0.5' 0.5 7/14/2010 <0.750 2.78 105 <0.250 <0.500 6.66 3.85 7.85 346 <0.250 4.58 <0.750 <0.250 <0.750 23.6 25.5 <0.0835SB-56-3' 3 7/14/2010 1.41 1.83 90.5 <0.250 <0.500 8.42 5.22 7.23 6.96 <0.250 4.60 <0.750 <0.250 <0.750 34.8 33.6 <0.0835SB-56-6' 6 7/14/2010 <0.750 4.35 108 <0.250 <0.500 6.65 8.24 8.67 4.16 <0.250 4.99 <0.750 <0.250 <0.750 41.2 50.1 <0.0835SB-56-9' 9 7/14/2010 <0.750 3.57 64.5 <0.250 <0.500 10.6 5.42 9.64 3.50 <0.250 9.10 <0.750 <0.250 <0.750 33.6 25.3 <0.0835SB-56-15' 15 7/14/2010 <0.750 2.97 133 0.307 <0.500 9.38 9.50 9.11 5.31 <0.250 7.49 <0.750 <0.250 <0.750 42.0 36.2 <0.0835

SB-56-20.5' 20.5 7/14/2010 <0.750 1.19 66.3 <0.250 <0.500 13.7 6.99 6.03 3.58 <0.250 8.37 <0.750 <0.250 <0.750 36.1 18.7 <0.0835SB-56-25' 25 7/14/2010 <0.750 3.25 155 0.327 <0.500 10.8 10.5 8.68 5.17 <0.250 9.71 <0.750 <0.250 <0.750 47.6 40.8 <0.0835

SB-57-20.5 20.5 7/15/2010 <0.750 0.764 70.7 <0.250 <0.500 11.6 5.32 5.29 2.32 <0.250 6.52 <0.750 <0.250 <0.750 26.9 14.3 <0.0835SS-10 0 7/14/2010 -- -- -- -- -- -- -- -- 599 -- -- -- -- -- -- -- --

TP-1-0.5' 0.5 7/12/2010 <0.750 1.44 93.3 <0.250 <0.500 5.91 4.42 7.13 108 <0.250 4.53 <0.750 <0.250 <0.750 19.6 39.6 <0.0835TP-1-3' 3 7/12/2010 <0.750 0.941 88.8 <0.250 <0.500 6.43 6.15 6.70 9.75 <0.250 4.55 <0.750 <0.250 <0.750 27.0 27.2 <0.0835TP-1-6' 6 7/12/2010 <0.750 0.983 53.1 <0.250 <0.500 4.70 4.68 4.70 4.29 <0.250 3.54 <0.750 <0.250 <0.750 21.7 20.1 <0.0835

TP-2-0.5' 0.5 7/12/2010 <0.750 2.12 100 <0.250 <0.500 9.79 6.08 16.4 200 <0.250 10.8 <0.750 <0.250 <0.750 23.1 60.3 <0.0835TP-2-3' 3 7/12/2010 <0.750 1.61 92.3 <0.250 <0.500 7.40 5.99 9.46 39.3 <0.250 5.62 <0.750 <0.250 <0.750 25.5 35.7 <0.0835TP-2-6' 6 7/12/2010 <0.750 1.39 82.4 <0.250 <0.500 8.00 6.38 7.35 28.1 <0.250 5.74 <0.750 <0.250 <0.750 31.8 29.0 <0.0835TP-2-9' 9 7/12/2010 <0.750 0.961 59.5 <0.250 <0.500 6.26 5.62 5.33 8.11 <0.250 4.13 <0.750 <0.250 <0.750 27.7 23.4 <0.0835

TP-3-0.5' 0.5 7/12/2010 <0.750 2.07 110 <0.250 <0.500 7.11 4.57 20.4 347 <0.250 4.79 <0.750 <0.250 <0.750 24.2 61.9 <0.0835TP-3-3' 3 7/12/2010 <0.750 2.08 89.8 <0.250 <0.500 7.41 5.83 8.75 75.1 <0.250 5.32 <0.750 <0.250 <0.750 27.2 35.6 <0.0835TP-3-6' 6 7/12/2010 <0.750 1.55 76.8 <0.250 <0.500 6.81 5.98 6.09 19.9 <0.250 4.66 <0.750 <0.250 <0.750 29.2 25.8 <0.0835

TP-4-0.5' 0.5 7/12/2010 <0.750 0.867 104 <0.250 <0.500 6.35 5.69 7.42 8.68 <0.250 4.76 <0.750 <0.250 <0.750 23.4 32.6 <0.0835TP-4-3' 3 7/12/2010 <0.750 1.47 62.4 <0.250 <0.500 5.81 5.77 4.84 4.69 <0.250 3.78 <0.750 <0.250 <0.750 25.9 21.9 <0.0835TP-4-6' 6 7/12/2010 <0.750 1.73 61.8 <0.250 <0.500 6.33 5.61 5.24 2.83 <0.250 4.28 <0.750 <0.250 <0.750 29.1 21.9 <0.0835

TP-5-0.5' 0.5 7/13/2010 <0.750 0.988 109 <0.250 <0.500 6.53 6.82 8.41 92.7 <0.250 9.24 <0.750 <0.250 <0.750 22.6 50.9 <0.0835


EPA Method 7471A





(feet) Date

TP-5-3' 3 7/13/2010 <0.750 1.17 90.0 <0.250 <0.500 6.92 6.23 6.99 8.92 <0.250 5.19 <0.750 <0.250 <0.750 28.6 29.8 <0.0835TP-5-6' 6 7/13/2010 <0.750 2.62 86.2 <0.250 <0.500 7.28 6.53 6.26 3.10 <0.250 4.73 <0.750 <0.250 <0.750 33.1 25.8 <0.0835

TP-6-0.5' 0.5 7/13/2010 1.13 4.78 123 <0.250 <0.500 11.0 6.75 24.5 701 <0.250 9.38 <0.750 <0.250 <0.750 25.1 185 0.158TP-6-3' 3 7/13/2010 <0.750 1.66 95.3 <0.250 <0.500 7.73 6.78 8.29 57.6 <0.250 5.63 <0.750 <0.250 <0.750 28.5 40.2 <0.0835TP-6-6' 6 7/13/2010 <0.750 1.83 71.3 <0.250 <0.500 7.20 6.48 6.05 8.05 <0.250 4.82 <0.750 <0.250 <0.750 29.4 26.9 <0.0835

TP-7-25S 1.17 7/12/2010 <0.750 <0.750 162 0.331 <0.500 7.06 9.66 8.05 259 <0.250 20.1 <0.750 <0.250 <0.750 26.7 127 <0.0835TP-7-25D 2.67 7/12/2010 <0.750 1.48 109 <0.250 <0.500 7.36 8.46 7.21 22.4 <0.250 6.92 <0.750 <0.250 <0.750 28.6 44.1 <0.0835TP-7-40S 1.17 7/12/2010 <0.750 2.56 106 <0.250 <0.500 7.23 5.47 10.7 11.9 <0.250 3.71 <0.750 <0.250 <0.750 44.6 28.3 <0.0835TP-7-40D 2.67 7/12/2010 <0.750 2.03 103 <0.250 <0.500 10.3 5.54 11.1 4.08 <0.250 4.37 <0.750 <0.250 <0.750 43.0 32.9 <0.0835TP-8-0.5' 0.5 7/13/2010 6.25 2.83 79.5 <0.250 <0.500 7.02 5.32 13.0 250 <0.250 13.4 <0.750 <0.250 <0.750 23.7 75.0 <0.0835TP-8-3' 3 7/13/2010 <0.750 2.03 105 <0.250 <0.500 7.11 6.37 8.46 7.36 <0.250 7.03 <0.750 <0.250 <0.750 29.1 33.9 <0.0835TP-8-6' 6 7/13/2010 <0.750 1.54 97.0 <0.250 <0.500 7.37 8.20 6.79 4.04 <0.250 5.67 <0.750 <0.250 <0.750 35.7 28.6 <0.0835

TP-9-0.5' 0.5 7/13/2010 <0.750 3.30 146 <0.250 <0.500 11.1 8.84 46.2 168 0.361 155 <0.750 <0.250 <0.750 157 107 0.215TP-9-3' 3 7/13/2010 <0.750 2.13 113 <0.250 <0.500 7.26 7.35 14.4 24.9 <0.250 30.7 <0.750 <0.250 <0.750 65.6 42.6 <0.0835TP-9-6' 6 7/13/2010 <0.750 2.00 109 <0.250 <0.500 7.01 6.91 6.70 5.49 <0.250 6.81 <0.750 <0.250 <0.750 36.8 27.2 <0.0835TP-9-9' 9 7/13/2010 <0.750 1.10 75.5 <0.250 <0.500 5.53 5.76 5.79 2.91 <0.250 4.59 <0.750 <0.250 <0.750 28.0 22.0 <0.0835

TP-10-0.5' 0.5 7/13/2010 <0.750 1.69 108 <0.250 <0.500 7.90 6.13 11.4 30.7 <0.250 4.96 <0.750 <0.250 <0.750 30.4 38.3 <0.0835TP-10-3' 3 7/13/2010 <0.750 2.23 99.6 <0.250 <0.500 8.40 6.17 14.6 15.9 <0.250 5.13 <0.750 <0.250 <0.750 31.6 37.6 <0.0835TP-10-6' 6 7/13/2010 <0.750 2.25 105 0.489 <0.500 7.66 9.34 7.90 4.92 <0.250 27.3 <0.750 <0.250 <0.750 34.3 108 <0.0835

TP-11-0.5' 0.5 7/13/2010 <0.750 1.06 71.9 <0.250 <0.500 5.76 5.48 10.0 32.0 <0.250 15.6 <0.750 <0.250 <0.750 23.1 75.7 <0.0835TP-11-3' 3 7/13/2010 <0.750 1.42 109 <0.250 <0.500 6.46 6.19 8.00 9.43 <0.250 6.77 <0.750 <0.250 <0.750 25.7 141 <0.0835TP-11-6' 6 7/13/2010 <0.750 1.49 98.1 <0.250 <0.500 7.12 5.63 6.73 4.47 <0.250 4.84 <0.750 <0.250 <0.750 35.1 99.5 <0.0835TP-11-9' 9 7/13/2010 <0.750 1.16 59.0 <0.250 <0.500 4.32 4.16 4.50 3.20 <0.250 3.21 <0.750 <0.250 <0.750 22.8 39.4 <0.0835AK-1-30" 2.5 7/15/2010 <0.750 0.795 84.4 <0.250 <0.500 6.06 5.81 7.05 39.6 <0.250 6.53 <0.750 <0.250 <0.750 22.3 36.8 <0.0835AK-1-38" 3.17 7/15/2010 <0.750 0.956 83.1 <0.250 <0.500 6.65 6.31 7.50 24.4 <0.250 7.77 <0.750 <0.250 <0.750 23.9 106 <0.0835AK-2-20" 1.7 7/15/2010 <0.750 <0.750 95.3 <0.250 <0.500 5.99 6.23 7.03 31.7 <0.250 4.76 <0.750 <0.250 <0.750 21.8 62.0 <0.0835AK-2-34" 2.83 7/15/2010 <0.750 0.926 62.9 <0.250 <0.500 6.04 4.91 5.59 6.69 <0.250 3.75 <0.750 <0.250 <0.750 23.2 20.7 <0.0835

AK-3-17" 1.42 7/15/2010 <0.750 1.23 81.0 <0.250 0.553 6.79 5.19 6.58 2.77 <0.250 4.66 <0.750 <0.250 <0.750 24.9 334 <0.0835

Table Notes:Bold values represent positive detections.< - Indicates constituent not detected at concentrations equal to or greater than the specified reporting limit.J - Estimated value.

Abbreviations:DUP - Indicates duplicate sample. Sb - Antimony Be - Beryllium Co - Cobalt Mo - Molybdenum Ag - Silver Z - ZincEPA - Environmental Protection Agency As - Arsenic Cd - Cadmium Cu - Copper Ni - Nickel Tl - Thallium Hg - Mercurymg/kg - Milligrams per kilogram Ba - Barium Cr - Chromium Pb - Lead Se - Selenium V - Vanadium


EPA Method 5030B/8015BTPH-g TPH-d TPH-momg/kg mg/kg mg/kg

SS-1 0 2/24/2006 <1.0 700 1,000SS-2 0 2/24/2006 <1.0 420 570SS-3 0 2/24/2006 <1.0 4,900 7,700SS-4 0 2/24/2006 <1.0 210 250SS-5 0 2/24/2006 <1.0 280 380SS-6 0 2/24/2006 <1.0 16 19SS-7 0 2/24/2006 <1.0 2,200 3,700SS-8 0 2/24/2006 <1.0 1,700 2,900SS-9 0 2/24/2006 <1.0 910 1,300

SB-1-0' 0 10/15/2008 <0.50 30 65 *SB-1-3' 3 10/15/2008 <0.50 <5.0 <25SB-1-6' 6 10/15/2008 <0.50 <5.0 <25SB-1-9' 9 10/15/2008 <0.50 <5.0 <25

SB-2-0' 0 10/15/2008 <0.50 <5.0 <25SB-2-0' (DUP-6) 0 10/15/2008 <0.50 <5.0 <25

SB-2-3' 3 10/15/2008 <0.50 11 <25SB-2-6' 6 10/15/2008 <0.50 <5.0 <25SB-2-9' 9 10/15/2008 <0.50 <5.0 <25

SB-3-0' 0 10/14/2008 <0.50 200 * 710SB-3-3' 3 10/14/2008 <0.50 200 * 950SB-3-6' 6 10/14/2008 <0.50 90 * 500SB-3-9' 9 10/14/2008 <0.50 <5.0 <25

SB-3-9' (DUP-3) 9 10/14/2008 <0.50 <5.0 <25SB-4-0' 0 10/14/2008 <0.50 980 * 4,600SB-4-3' 3 10/14/2008 <0.50 58 * 210SB-4-6' 6 10/14/2008 <0.50 1,100 * 4,000SB-4-7' 7 10/14/2008 <0.50 220 * 930SB-4-9' 9 10/14/2008 <0.50 <5.0 30SB-5-0' 0 10/15/2008 0.69 2,500 * 7,000SB-5-6' 6 10/15/2008 <0.50 <5.0 <25SB-5-9' 9 10/15/2008 <0.50 <5.0 <25

SB-6-7.5' 7.5 10/14/2008 1.6 * 1,400 * 2,600SB-6-9.5' 9.5 10/14/2008 2,800 42,000 * 29,000SB-6-12.5' 12.5 10/14/2008 34,000 * 77,000 * 45,000

SB-7-0' 0 10/15/2008 330 * 6,200 11,000 *SB-7-3' 3 10/15/2008 <0.50 110 260 *SB-7-6' 6 10/15/2008 17 * 2,600 5,800 *

SB-7-6' (DUP-4) 6 10/15/2008 1.1 * 36 * 98 *SB-7-9' 9 10/15/2008 <0.50 <5.0 <25SB-8-0' 0 10/15/2008 <5.0 <5.0 <25SB-8-3' 3 10/15/2008 <5.0 5.7 <25

SB-8-5.5' 5.5 10/15/2008 12 J 4,100 6,700 *SB-8-6' 6 10/15/2008 <5.0 <5.0 <25SB-8-9' 9 10/15/2008 <5.0 <5.0 <25SB-9-0' 0 10/13/2008 <0.50 940 * 3,000SB-9-3' 3 10/13/2008 <0.50 17 * 39

TABLE A-2


Sample ID DateDepth (feet)

Historical Soil Chemical Data - Petroleum Hydrocarbons

app a_Historical Data_Lodi MGP.xlsx/A2 1 of 8 Stantec Consulting Inc.


TABLE A-2




SB-9-3' (DUP-1) 3 10/13/2008 <0.50 11 <25SB-9-6' 6 10/13/2008 <0.50 150 * 960 *SB-9-9' 9 10/13/2008 <0.50 <5.0 <25

SB-9-9' (DUP-2) 9.0 10/13/2008 <0.50 53 * 150SB-10-1.5' 1.5 10/15/2008 7.7 J 3,000 7,800 *SB-10-3' 3 10/15/2008 <0.5 220 810 *

SB-10-3' (DUP-5) 3 10/15/2008 <0.5 7.8 26SB-10-6' 6 10/15/2008 <0.50 13 48SB-10-9' 9 10/15/2008 <0.50 <5 <25

SB-11-0' 0.0 10/14/2008 <0.50 390 * 1,500SB-11-3' 3.0 10/14/2008 <0.50 <5.0 27SB-11-6' 6.0 10/14/2008 <0.50 6.5 <25SB-11-9' 9.0 10/14/2008 <0.50 <5.0 <25SB-11-15' 15.0 10/14/2008 <0.50 <5.0 <25SB-12-0' 0.0 10/14/2008 <0.50 540 * 1,600

SB-12-1.5' 1.5 10/14/2008 <0.50 <5.0 <25SB-12-3' 3.0 10/14/2008 <0.50 2,400 * 8,600SB-12-6' 6.0 10/14/2008 <0.50 1,300 * 7,400SB-12-9' 9.0 10/14/2008 <0.50 120 * 290SB-12-12' 12.0 10/14/2008 <0.50 <5.0 <25SB-12-15' 15.0 10/14/2008 <0.50 6.3 <25SB-13-0' 0.0 10/13/2008 <0.50 3,300 * 6,000 *SB-13-3' 3.0 10/13/2008 <0.50 650 * 1,300 *SB-13-6' 6.0 10/13/2008 <0.50 <5.0 <25SB-13-9' 9.0 10/13/2008 <0.50 <5.0 <25SB-14-0' 0.0 10/13/2008 <0.50 2,200 * 7,400SB-14-2' 2.0 10/13/2008 1,100 * 27,000 * 27,000 *SB-14-3' 3.0 10/13/2008 460 * 4,300 * 5,000 *SB-14-6' 6.0 10/13/2008 49 * 770 * 880SB-14-9' 9.0 10/13/2008 <0.50 <5.0 <25SB-15-0' 0.0 10/13/2008 <0.50 3,000 * 9,900SB-15-3' 3.0 10/13/2008 <0.50 3,100 * 8,700SB-15-6' 6.0 10/13/2008 <0.50 490 * 1,400SB-15-9' 9.0 10/13/2008 <0.50 9.5 <25SB-16-1' 1.0 10/13/2008 <0.50 430 * 980 *SB-16-3' 3.0 10/13/2008 <0.50 160 * 820SB-16-6' 6.0 10/13/2008 <0.50 240 * 1,300SB-16-9' 9.0 10/13/2008 <0.50 <5.0 <25SB-17-1' 1 11/5/2009 <0.50 1,900 * 4,900SB-17-18' 18 11/6/2009 450* 7,400 ** 8,000

SB-17-20.5' 20.5 11/6/2009 2,000* 17,000 ** 19,000SB-17-25.5' 25.5 11/6/2009 <0.50 <5.0 <25

SB-18-0' 0 11/4/2009 <0.50 1,800* 6,900SB-18-8' 8 11/4/2009 31* 1,200* 6,000SB-18-16' 16 11/4/2009 8.5* 4,000* 4,600SB-18-26' 26 11/4/2009 <0.50 75* 230



TABLE A-2




SB-18-26' (DUP-1) 26 11/4/2009 <0.50 <5.0 <25SB-18-65' 65 11/4/2009 <0.50 <5.0 <25

SB-19-5' 5 11/5/2009 <0.50 1,500* 2,900SB-19-15.5 15.5 11/5/2009 490* 12,000 ** 12,000SB-19-21' 21 11/5/2009 1,500* 9,200 ** 8,600SB-19-28' 28 11/5/2009 <0.50 7.3* <25

SB-20-0' 0 11/4/2009 <0.50 420* 1,100SB-20-14' 14 11/5/2009 <0.50 <5.0 <25SB-20-20' 20 11/5/2009 8.7* 1,600 ** 1,800

SB-20-66.5' 66.5 11/5/2009 <0.50 <5.0 <25SB-20-66.5' (DUP-4) 66.5 11/5/2009 <0.50 <5.0 <25

SB-21-0' 0 11/3/2009 <0.50 57* 180SB-21-5' 5 11/2/2009 <0.50 <5.0 <25SB-21-10' 10 11/2/2009 <0.50 <5.0 <25

SB-22-0' 0 11/2/2009 <0.50 63* 180SB-22-5' 5 11/2/2009 <0.50 <5.0 <25SB-22-10' 10 11/2/2009 <0.50 <5.0 <25

SB-23-0' 0 11/2/2009 <0.50 2,800* 8,300SB-23-10' 10 11/2/2009 <0.50 <5.0 <25SB-23-12' 12 11/2/2009 <0.50 2,700* 6,800SB-23-15' 15 11/2/2009 <0.50 <5.0 <25

SB-24-0' 0 11/2/2009 <0.50 84* 240SB-24-5' 5 11/2/2009 <0.50 <5.0 <25SB-24-10' 10 11/2/2009 <0.50 12* <25

SB-25-0' 0 11/2/2009 <0.50 1,600* 4,100SB-25-5' 5 11/2/2009 <0.50 <5.0 <25SB-25-10' 10 11/2/2009 <0.50 <5.0 <25

SB-26-0.5' 0.5 11/5/2009 <0.50 210* 680SB-26-5' 5 11/5/2009 <0.50 6.0* <25SB-26-15' 15 11/5/2009 <0.50 <5.0 <25

SB-27-0.5' 0.5 11/5/2009 <0.50 26* 73SB-27-5' 5 11/5/2009 <0.50 7.0* <25

SB-27-10' (DUP-5) 10 11/5/2009 <0.50 <5.0 <25SB-27-15' 15 11/5/2009 <0.50 5.9* <25

SB-28-0.5' 0.5 11/5/2009 <0.50 <5.0 <25SB-28-8' 8 11/5/2009 <0.50 <5.0 <25SB-28-15' 15 11/5/2009 <0.50 5.3* <25

SB-29-0.5' 0.5 11/4/2009 <0.50 7.4* <25SB-29-5' 5 11/4/2009 <0.50 <5.0 <25SB-29-10' 10 11/4/2009 <0.50 <5.0 <25SB-29-13' 13 11/4/2009 <0.50 <5.0 <25

SB-30-0.5' 0.5 11/4/2009 <0.50 15* 41SB-30-5' 5 11/4/2009 <0.50 <5.0 <25

SB-30-5' (DUP-3) 5 11/4/2009 <0.50 <5.0 <25SB-30-10' 10 11/4/2009 <0.50 <5.0 <25



TABLE A-2




SB-30-13' 13 11/4/2009 <0.50 <5.0 <25

SB-31-0.5' 0.5 11/4/2009 <0.50 <5.0 <25SB-31-5' 5 11/4/2009 <0.50 <5.0 <25SB-31-10' 10 11/4/2009 <0.50 <5.0 <25SB-31-15' 15 11/4/2009 <0.50 <5.0 <25

SB-32-0.5' 0.5 11/4/2009 <0.50 22* 50SB-32-5' 5 11/4/2009 <0.50 <5.0 <25SB-32-10' 10 11/4/2009 <0.50 <5.0 <25SB-32-15' 15 11/4/2009 <0.50 <5.0 <25

SB-33-0.5' 0.5 11/4/2009 <0.50 2,200 5,100SB-33-5' 5 11/4/2009 <0.50 <5.0 <25SB-33-10' 10 11/4/2009 <0.50 <5.0 <25SB-33-15' 15 11/4/2009 <0.50 <5.0 <25

SB-34-0' 0 11/3/2009 <0.50 1,900* 7,300SB-34-8' 8 11/3/2009 <0.50 2,200* 5,900SB-34-12' 12 11/3/2009 <0.50 <5.0 <25

SB-34-12' (DUP-1) 12 11/3/2009 <0.50 <5.0 <25

SB-35-0' 0 11/9/2009 <0.50 110* 280SB-35-3' 3 11/9/2009 <0.50 <5.0 <25SB-35-6' 6 11/9/2009 <0.50 <5.0 <25SB-35-9' 9 11/9/2009 <0.50 <5.0 <25

SB-36-0' 0 11/9/2009 <0.50 50* 49SB-36-3' 3 11/9/2009 <0.50 5.4* <25SB-36-6' 6 11/9/2009 <0.50 <5.0 <25SB-36-9' 9 11/9/2009 <0.50 <5.0 <25

SB-37-0' 0 11/9/2009 <0.50 140* 100SB-37-3' 3 11/9/2009 <0.50 43* 130SB-37-6' 6 11/9/2009 <0.50 <5.0 <25SB-37-9' 9 11/9/2009 <0.50 <5.0 <25

SB-38-0' 0 11/9/2009 <0.50 110* 130SB-38-3' 3 11/9/2009 <0.50 7.8* <25SB-38-6' 6 11/9/2009 <0.50 <5.0 <25SB-38-9' 9 11/9/2009 <0.50 <5.0 <25

SB-39-0' 0 11/9/2009 <0.50 48* <25SB-39-3' 3 11/9/2009 <0.50 <5.0 <25SB-39-6' 6 11/9/2009 <0.50 <5.0 <25SB-39-9' 9 11/9/2009 <0.50 <5.0 <25

SB-39-9' (DUP-6) 9 11/9/2009 <0.50 <5.0 <25

SB-40-0' 0 11/10/2009 <0.50 50* 160SB-40-3' 3 11/10/2009 <0.50 190* 360SB-40-6' 6 11/10/2009 <0.50 11 <25SB-40-9' 9 11/10/2009 <0.50 6.7 <25

SB-41-0' 0 11/10/2009 <0.50 410* 1,400SB-41-3' 3 11/10/2009 <0.50 <5.0 <25SB-41-6' 6 11/10/2009 <0.50 <5.0 <25



TABLE A-2




SB-41-9' 9 11/10/2009 <0.50 <5.0 <25

SB-42-0' 0 11/10/2009 <0.50 15 <25SB-42-3' 3 11/10/2009 <0.50 <5.0 <25SB-42-6' 6 11/10/2009 <0.50 <5.0 <25SB-42-9' 9 11/10/2009 <0.50 <5.0 <25

SB-43-0' 0 11/10/2009 <0.50 220* 620SB-43-3' 3 11/10/2009 <0.50 <5.0 <25SB-43-6' 6 11/10/2009 <0.50 <5.0 <25SB-43-9' 9 11/10/2009 <0.50 8.1* <25

SB-44-0' 0 11/10/2009 <0.50 83* 83SB-44-3' 3 11/10/2009 0.93* 46* 80SB-44-6' 6 11/10/2009 <0.50 <5.0 <25SB-44-9' 9 11/10/2009 <0.50 <5.0 <25

SB-45-0' 0 11/10/2009 <0.50 130* 37SB-45-3' 3 11/10/2009 <0.50 6.5 <25SB-45-6' 6 11/10/2009 <0.50 <5.0 <25SB-45-9' 9 11/10/2009 <0.50 <5.0 <25

SB-46-0' 0 11/10/2009 <0.50 58* 150SB-46-3' 3 11/10/2009 <0.50 <5.0 <25SB-46-6' 6 11/10/2009 <0.50 <5.0 <25SB-46-9' 9 11/10/2009 <0.50 <5.0 <25

SB-47-0.5' 0.5 7/15/2010 <0.50 620* 1,400*SB-47-3' 3 7/15/2010 <0.50 25* 100SB-47-6' 6 7/15/2010 <0.50 <5.0 <25

SB-48-1.5' 1.5 7/13/2010 <0.50 400* 1,100*SB-48-3' 3 7/13/2010 <0.50 270* 860*SB-48-6' 6 7/13/2010 <0.50 <5.0 <25

SB-49-3' 3 7/13/2010 <0.50 280* 940*SB-49-4' 4 7/13/2010 2,500* 12,000* 17,000*SB-49-6' 6 7/13/2010 0.55* 18* 45*

SB-50-1.5' 1.5 7/13/2010 <0.50 500* 1,000*SB-50-3' 3 7/13/2010 <0.50 <5.0 <25SB-50-6' 6 7/13/2010 <0.50 <5.0 <25

SB-51-1.5' 1.5 7/13/2010 <0.50 130* 250*SB-51-3' 3 7/13/2010 <0.50 160* 250*

SB-51-6.5' 6.5 7/13/2010 <0.50 12,000* 18,000*SB-51-9' A 9 7/13/2010 <0.50 <5.0 <25

SB-52-1' 1 7/12/2010 <0.50 <5.0 <25SB-52-3' 3 7/12/2010 <0.50 <5.0 <25SB-52-6' 6 7/12/2010 <0.50 <5.0 <25SB-52-9' 9 7/12/2010 <0.50 <5.0 <25SB-52-15' 15 7/12/2010 <0.50 <5.0 <25SB-52-20' 20 7/12/2010 550* 7600 ** 7,400

SB-52-24.5' 24.5 7/12/2010 0.51* 13* 64SB-53-0.5' 0.5 7/12/2010 <0.50 410* 1,300



TABLE A-2




SB-53-3' 3 7/13/2010 <0.50 1,000* 3,700SB-53-6' 6 7/13/2010 <0.50 850* 2,200SB-53-9' 9 7/13/2010 <0.50 8.8* 70SB-53-15' 15 7/13/2010 <0.50 <5.0 <25

SB-53-20.5' 20.5 7/13/2010 340* 2,600 ** 2,700SB-53-25' 25 7/13/2010 <0.50 <5.0 60SB-54-1' 1 7/12/2010 <0.50 <5.0 <25SB-54-3' 3 7/12/2010 <0.50 170* 360SB-54-6' 6 7/12/2010 <0.50 <5.0 <25SB-54-9' 9 7/12/2010 <0.50 160* 410SB-54-15' 15 7/12/2010 270* 3,500 ** 3,300SB-54-20' 20 7/12/2010 460* 4,000 ** 4,000SB-54-22' 22 7/12/2010 330* 3,900 ** 4,600SB-55-1.5' 1.5 7/13/2010 <0.50 <5.0 41SB-55-3' 3 7/13/2010 <0.50 <5.0 <25SB-55-6' 6 7/13/2010 <0.50 <5.0 <25SB-55-9' 9 7/13/2010 <0.50 <5.0 <25SB-55-15' 15 7/13/2010 <0.50 <5.0 <25SB-55-20' 20 7/13/2010 1,000* 7,300 ** 7,300SB-55-25' 25 7/13/2010 <0.50 <5.0 <25

SB-56-0.5' 0.5 7/14/2010 <0.50 740* 1,400*SB-56-3' 3 7/14/2010 <0.50 8.0* 50*SB-56-6' 6 7/14/2010 <0.50 <5.0 <25SB-56-9' 9 7/14/2010 <0.50 <5.0 <25SB-56-15' 15 7/14/2010 <0.50 <5.0 <25

SB-56-20.5' 20.5 7/14/2010 1,000* 11,000 ** 12,000SB-56-25' 25 7/14/2010 <0.50 <5.0 <25

SB-57-20.5 20.5 7/15/2010 <0.50 <5.0 <25

SB-58-0 0 9/22/2010 0.020 770* 2,800SB-58-5 5 9/22/2010 <0.017 <5.0 <25SB-58-10 10 9/22/2010 <0.012 <5.0 <25

SB-59-3 3 9/22/2010 0.150 15,000* 35,000*SB-59-5 5 9/22/2010 <0.015 <5.0 <25SB-59-10 10 9/22/2010 <0.019 <5.0 <25

SB-60-0 0 9/22/2010 0.018 270* 810SB-60-5 5 9/22/2010 <0.010 13* 83SB-60-10 10 9/22/2010 0.013 <5.0 <25

SB-61-0 0 9/22/2010 0.025 27* 96SB-61-5 5 9/22/2010 <0.013 <5.0 <25SB-61-10 10 9/22/2010 <0.017 <5.0 <25

SB-62-0 0 9/22/2010 0.200 6,500* 14,000*SB-62-5 5 9/22/2010 0.180 460* 920*SB-62-10 10 9/22/2010 0.047 <5.0 <25SB-62-15 15 9/23/2010 <0.013 12* <25

SB-63-1 1 9/23/2010 0.110 810* 2,400*SB-63-5 5 9/23/2010 <0.016 <5.0 <25



TABLE A-2




SB-63-10 10 9/23/2010 0.016 6.5* <25SB-63-15 15 9/23/2010 0.019 <5.0 <25

SB-64-1 1 9/22/2010 0.018 570* 1,600*SB-64-5 5 9/22/2010 <0.015 940* 3,300*SB-64-10 10 9/22/2010 <0.013 <5.0 <25SB-64-15 15 9/22/2010 <0.015 14* <25

SB-65-1 1 9/23/2010 <0.013 <5.0 <25SB-65-5 5 9/23/2010 0.025 570* 2,100SB-65-10 10 9/23/2010 <0.013 6.0* <25SB-65-15 15 9/23/2010 <0.014 <5.0 <25

SB-66-0 0 9/23/2010 0.028 15* 28SB-66-5 5 9/23/2010 0.013 <5.0 <25SB-66-10 10 9/23/2010 <0.011 <5.0 <25

SB-67-0 0 9/23/2010 0.120 24* 100SB-67-5 5 9/23/2010 0.044 <5.0 <25SB-67-10 10 9/23/2010 <0.013 <5.0 <25

SB-68-0 0 9/23/2010 0.073 4,300* 7,300SB-68-5 5 9/23/2010 0.026 <5.0 <25SB-68-10 10 9/23/2010 0.025 <5.0 <25

SB-69-0 0 9/23/2010 11 350* 1,200SB-69-5 5 9/23/2010 0.016 <5.0 <25SB-69-10 10 9/23/2010 <0.015 <5.0 <25

TP-1-0.5' 0.5 7/12/2010 <0.50 5.8* 26TP-1-3' 3 7/12/2010 <0.50 <5.0 <25TP-1-6' 6 7/12/2010 <0.50 <5.0 <25

TP-2-0.5' 0.5 7/12/2010 <0.50 42* 110TP-2-3' 3 7/12/2010 <0.50 <5.0 <25TP-2-6' 6 7/12/2010 <0.50 <5.0 <25

TP-2-9' A 9 7/12/2010 <0.50 <5.0 <25

TP-3-0.5' 0.5 7/12/2010 <0.50 410* 880*TP-3-3' 3 7/12/2010 <0.50 27* 68*TP-3-6' 6 7/12/2010 <0.50 18* 45*

TP-4-0.5' 0.5 7/12/2010 <0.50 <5.0 <25TP-4-3' 3 7/12/2010 <0.50 <5.0 <25TP-4-6' 6 7/12/2010 <0.50 <5.0 <25

TP-5-0.5' 0.5 7/13/2010 <0.50 <5.0 <25TP-5-3' 3 7/13/2010 <0.50 <5.0 <25TP-5-6' 6 7/13/2010 <0.50 <5.0 <25

TP-6-0.5' 0.5 7/13/2010 <0.50 72* 170*TP-6-3' 3 7/13/2010 <0.50 <5.0 <25TP-6-6' 6 7/13/2010 <0.50 <5.0 <25

TP-7-25S 1.17 7/12/2010 <0.50 70* 130*TP-7-25D 2.67 7/12/2010 <0.50 5.5* <25TP-7-40S 1.17 7/12/2010 <0.50 7.8* <25TP-7-40D 2.67 7/12/2010 <0.50 <5.0 <25



TABLE A-2




TP-8-0.5' 0.5 7/13/2010 <0.50 520* 1,500*TP-8-3' 3 7/13/2010 <0.50 55* 150*TP-8-6' 6 7/13/2010 <0.50 <5.0 <25

TP-9-0.5' 0.5 7/13/2010 <0.50 490* 1,400*TP-9-3' 3 7/13/2010 <0.50 82* 230*TP-9-6' 6 7/13/2010 <0.50 <5.0 <25

TP-9-9' A 9 7/13/2010 <0.50 22* 45TP-10-0.5' 0.5 7/13/2010 <0.50 <5.0 <25TP-10-3' 3 7/13/2010 <0.50 70* 190*TP-10-6' 6 7/13/2010 <0.50 <5.0 <25

TP-11-0.5' 0.5 7/13/2010 <0.50 700* 1,600*TP-11-3' 3 7/13/2010 <0.50 340* 940*TP-11-6' 6 7/13/2010 <0.50 40* 99*

TP-11-9' A 9 7/13/2010 <0.50 19* 44*AK-1-30" 2.5 7/15/2010 <0.50 15* 43AK-1-38" 3.17 7/15/2010 <0.50 <5.0 <25

AK-2-20" 1.7 7/15/2010 <0.50 <5.0 <25AK-2-34" 2.83 7/15/2010 <0.50 <5.0 <25AK-3-17" 1.42 7/15/2010 <0.50 <5.0 <25

Table Notes:Bold values represent positive detections.* - Indicates chromatographic pattern does not match that of standard.** - Heavier hydrocarbons were also detectedJ - Indicates estimated value higher than the method detection limit, but below the laboratory reporting limit.

May 2008.A - Sample extracted outside recommended hold time.

AbbreviationsDUP - Indicates duplicate sample.EPA - Environmental Protection AgencyTPH-g - Total petroleum hydrocarbons as gasolineTPH-d - Total Petroleum Hydrocarbons as diesel (processed using silica gel cleanup)TPH-mo - Total Petroleum Hydrocarbons as motor oil (processed using silica gel cleanup)

< - Indicates constituent not detected at concentrations equal to or greater than the specified reporting limit.


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SS-1 0 2/24/2006 <5.0 <5.0 <5.0 <5.0 <5.0SS-2 0 2/24/2006 <5.0 <5.0 <5.0 <5.0 <5.0SS-3 0 2/24/2006 <5.0 <5.0 <5.0 <5.0 <5.0SS-4 0 2/24/2006 <25 <25 <25 <25 <25SS-5 0 2/24/2006 <25 <25 <25 <25 <25SS-6 0 2/24/2006 <25 <25 <25 <25 <25SS-7 0 2/24/2006 <25 <25 <25 <25 <25SS-8 0 2/24/2006 <25 <25 <25 <25 <25SS-9 0 2/24/2006 <25 <25 <25 <25 <25

SB-1-0' 0 10/15/2008 <5 <5 <5 <5 <5SB-1-3' 3 10/15/2008 <5 <5 <5 <5 <5SB-1-6' 6 10/15/2008 <5 <5 <5 <5 <5SB-1-9' 9 10/15/2008 <5 <5 <5 <5 <5

SB-2-0' 0 10/15/2008 <5 <5 <5 <5 <5SB-2-0' (DUP-6) 0 10/15/2008 <5 <5 <5 <5 <5

SB-2-3' 3 10/15/2008 <5 <5 <5 <5 <5SB-2-6' 6 10/15/2008 <5 <5 <5 <5 <5SB-2-9' 9 10/15/2008 <5 <5 <5 <5 <5

SB-3-0' 0 10/14/2008 <5 <5 <5 <5 <5SB-3-3' 3 10/14/2008 <5 <5 <5 <5 <5SB-3-6' 6 10/14/2008 <5 <5 <5 <5 <5SB-3-9' 9 10/14/2008 <5 <5 <5 <5 <5

SB-3-9' (DUP-3) 9 10/14/2008 <5 <5 <5 <5 <5

SB-4-0' 0 10/14/2008 <5 <5 <5 <5 <5SB-4-3' 3 10/14/2008 <5 <5 <5 <5 <5SB-4-6' 6 10/14/2008 9.5 <5 <5 <5 <5SB-4-7' 7 10/14/2008 <5 <5 <5 <5 <5SB-4-9' 9 10/14/2008 <5 <5 <5 <5 <5

SB-5-0' 0 10/15/2008 23 <5 18 9.9 <5SB-5-6' 6 10/15/2008 <5 <5 <5 <5 <5SB-5-9' 9 10/15/2008 <5 <5 <5 <5 <5

SB-6-7.5' 7.5 10/14/2008 140 <5 <5 <5 <5SB-6-9.5' 9.5 10/14/2008 2,700,000 50,000 <500,000 58,000 19,000SB-6-12.5' 12.5 10/14/2008 3,700,000 40,000 <500,000 84,000 28,000

SB-7-0' 0 10/15/2008 <5 <5 <5 <5 <5SB-7-3' 3 10/15/2008 <5 <5 <5 <5 <5SB-7-6' 6 10/15/2008 <5 <5 <5 <5 <5

SB-7-6' (DUP-4) 6 10/15/2008 <5 <5 <5 <5 <5SB-7-9' 9 10/15/2008 <5 <5 <5 <5 <5

SB-8-0' 0 10/15/2008 <5 <5 <5 <5 <5SB-8-3' 3 10/15/2008 <5 <5 <5 <5 <5

SB-8-5.5' 5.5 10/15/2008 <5 <5 <5 <5 <5SB-8-6' 6 10/15/2008 <5 <5 <5 <5 <5SB-8-9' 9 10/15/2008 <5 <5 <5 <5 <5

TABLE A-3Historical Soil Chemical Data - BTEX

Pacific Gas and Electric Company Former Manufactured Gas Site712 S. Sacramento Street, Lodi, California

Sample IDDepth(feet)

BTEX (ug/kg)EPA Method 5030B/8260B

Date

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DateSB-9-0' 0 10/13/2008 <5 <5 <5 <5 <5SB-9-3' 3 10/13/2008 <5 <5 <5 <5 <5

SB-9-3' (DUP-1) 3 10/13/2008 <5 <5 <5 <5 <5SB-9-6' 6 10/13/2008 <5 <5 <5 <5 <5SB-9-9' 9 10/13/2008 <5 <5 <5 <5 <5

SB-9-9' (DUP-2) 9 10/13/2008 <5 <5 <5 <5 <5

SB-10-1.5' 1.5 10/15/2008 <5 <5 <5 <5 <5SB-10-3' 3 10/15/2008 <5 <5 <5 <5 <5

SB-10-3' (DUP-5) 3 10/15/2008 <5 <5 <5 <5 <5SB-10-6' 6 10/15/2008 <5 <5 <5 <5 <5SB-10-9' 9 10/15/2008 <5 <5 <5 <5 <5

SB-11-0' 0 10/14/2008 22 <5 <5 <5 <5SB-11-3' 3 10/14/2008 17 <5 <5 <5 <5SB-11-6' 6 10/14/2008 6.3 <5 <5 <5 <5SB-11-9' 9 10/14/2008 <5 <5 <5 <5 <5SB-11-15' 15 10/14/2008 <5 <5 <5 <5 <5

SB-12-0' 0 10/14/2008 16 <5 <5 <5 <5SB-12-1.5' 1.5 10/14/2008 <5 <5 <5 <5 <5SB-12-3' 3 10/14/2008 <5 <5 <5 <5 <5SB-12-6' 6 10/14/2008 7.7 <5 6.8 <5 <5SB-12-9' 9 10/14/2008 <5 <5 <5 <5 <5SB-12-12' 12 10/14/2008 <5 <5 <5 <5 <5SB-12-15' 15 10/14/2008 <5 <5 <5 <5 <5

SB-13-0' 0 10/13/2008 <500* <500* <500* <500* <500*SB-13-3' 3 10/13/2008 <500* <500* <500* <500* <500*SB-13-6' 6 10/13/2008 <5 <5 <5 <5 <5SB-13-9' 9 10/13/2008 <5 <5 <5 <5 <5

SB-14-0' 0 10/13/2008 <500* <500* <500* <500* <500*SB-14-2' 2 10/13/2008 <5,000* <5,000* <5,000* <5,000* <5,000*SB-14-3' 3 10/13/2008 <5,000* <5,000* <5,000* <5,000* <5,000*SB-14-6' 6 10/13/2008 <500* <500* <500* <500* <500*SB-14-9' 9 10/13/2008 <5 <5 <5 <5 <5

SB-15-0' 0 10/13/2008 <500* <500* <500* <500* <500*SB-15-3' 3 10/13/2008 <500* <500* <500* <500* <500*SB-15-6' 6 10/13/2008 <5 <5 <5 <5 <5SB-15-9' 9 10/13/2008 <5 <5 <5 <5 <5

SB-16-1' 1 10/13/2008 <5 <5 <5 <5 <5SB-16-3' 3 10/13/2008 <5 <5 <5 <5 <5SB-16-6' 6 10/13/2008 <5 <5 <5 <5 <5SB-16-9' 9 10/13/2008 <5 <5 <5 <5 <5

SB-17-1' 1 11/5/2009 <1.0 <1.0 <1.0 <2.1 <1.0SB-17-18' 18 11/6/2009 <47 110 <47 <94 <47

SB-17-20.5' 20.5 11/6/2009 <48 2,200 <48 97 360SB-17-25.5' 25.5 11/6/2009 <1.0 <1.0 <1.0 <2.0 <1.0

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DateSB-18-0' 0 11/4/2009 <0.79 <0.79 <0.79 <1.6 <0.79SB-18-8' 8 11/4/2009 <0.66 <0.66 <0.66 <1.3 <0.66SB-18-16' 16 11/4/2009 <120 <120 <120 <250 <120SB-18-26' 26 11/4/2009 <0.54 <0.54 <0.54 <1.1 <0.54

SB-18-26' (DUP-1) 26 11/4/2009 <0.85 <0.85 <0.85 <1.7 <0.85SB-18-65' 65 11/4/2009 <0.40 <0.40 <0.40 <0.80 <0.40

SB-19-5' 5 11/5/2009 <0.92 <0.92 <0.92 <1.8 <0.92SB-19-15.5 15.5 11/5/2009 <55 920 <55 <110 62SB-19-21' 21 11/5/2009 450 7,500 <40 690 210SB-19-28' 28 11/5/2009 <1.1 <1.1 <1.1 <2.1 <1.1

SB-20-0' 0 11/4/2009 4.7 <0.64 <0.64 <1.3 <0.64SB-20-14' 14 11/5/2009 <0.73 <0.73 <0.73 <1.5 <0.73SB-20-20' 20 11/5/2009 <0.43 9.3 <0.43 <0.86 1.1

SB-20-66.5' 66.5 11/5/2009 <0.78 <0.78 <0.78 <1.6 <0.78SB-20-66.5' (DUP-4) 66.5 11/5/2009 <0.86 <0.86 <0.86 <1.7 <0.86

SB-21-0' 0 11/3/2009 0.77 <0.60 0.62 <1.2 <0.60SB-21-5' 5 11/2/2009 <0.90 <0.90 <0.90 <1.8 <0.90SB-21-10' 10 11/2/2009 <0.78 <0.78 <0.78 <1.6 <0.78

SB-22-0' 0 11/2/2009 1.8 <0.56 <0.56 <1.1 <0.56SB-22-5' 5 11/2/2009 <0.56 <0.56 <0.56 <1.1 <0.56SB-22-10' 10 11/2/2009 <0.62 <0.62 <0.62 <1.2 <0.62

SB-23-0' 0 11/2/2009 1.2 <0.71 1.9 <1.4 <0.71SB-23-10' 10 11/2/2009 <0.69 <0.69 <0.69 <1.4 <0.69SB-23-12' 12 11/2/2009 <0.64 <0.64 0.83 <1.3 <0.64SB-23-15' 15 11/2/2009 <0.83 <0.83 <0.83 <1.7 <0.83

SB-24-0' 0 11/2/2009 <0.86 <0.86 <0.86 <1.7 <0.86SB-24-5' 5 11/2/2009 <0.74 <0.74 <0.74 <1.5 <0.74SB-24-10' 10 11/2/2009 <0.57 <0.57 <0.57 <1.1 <0.57

SB-25-0' 0 11/2/2009 35 <0.67 2.5 <1.3 <0.67SB-25-5' 5 11/2/2009 <0.42 <0.42 <0.42 <0.85 <0.42SB-25-10' 10 11/2/2009 <0.42 <0.42 <0.42 <0.85 <0.42

SB-26-0.5' 0.5 11/5/2009 <0.92 <0.92 <0.92 <1.8 <0.92SB-26-5' 5 11/5/2009 <0.81 <0.81 <0.81 <1.6 <0.81SB-26-15' 15 11/5/2009 <0.83 <0.83 <0.83 <1.7 <0.83

SB-27-0.5' 0.5 11/5/2009 <0.87 <0.87 <0.87 <1.7 <0.87SB-27-5' 5 11/5/2009 <0.77 <0.77 <0.77 <1.5 <0.77

SB-27-10' (DUP-5) 10 11/5/2009 <0.91 <0.91 <0.91 <1.8 <0.91SB-27-15' 15 11/5/2009 <0.80 <0.80 <0.80 <1.6 <0.80

SB-28-0.5' 0.5 11/5/2009 <0.92 <0.92 <0.92 <1.8 <0.92SB-28-8' 8 11/5/2009 <0.90 <0.90 <0.90 <1.8 <0.90SB-28-15' 15 11/5/2009 <1.0 <1.0 <1.0 <2.0 <1.0SB-29-0.5' 0.5 11/4/2009 <0.87 <0.87 <0.87 <1.7 <0.87SB-29-5' 5 11/4/2009 <0.77 <0.77 <0.77 <1.5 <0.77

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DateSB-29-10' 10 11/4/2009 <0.78 <0.78 <0.78 <1.6 <0.78SB-29-13' 13 11/4/2009 <0.74 <0.74 <0.74 <1.5 <0.74

SB-30-0.5' 0.5 11/4/2009 <0.91 <0.91 <0.91 <1.8 <0.91SB-30-5' 5 11/4/2009 <0.83 <0.83 <0.83 <1.7 <0.83

SB-30-5' (DUP-3) 5 11/4/2009 <0.87 <0.87 <0.87 <1.7 <0.87SB-30-10' 10 11/4/2009 <0.83 <0.83 <0.83 <1.7 <0.83SB-30-13' 13 11/4/2009 <0.84 <0.84 <0.84 <1.7 <0.84

SB-31-0.5' 0.5 11/4/2009 <0.84 <0.84 <0.84 <1.7 <0.84SB-31-5' 5 11/4/2009 <0.75 <0.75 <0.75 <1.5 <0.75SB-31-10' 10 11/4/2009 <0.77 <0.77 <0.77 <1.5 <0.77SB-31-15' 15 11/4/2009 <1.2 <1.2 <1.2 <2.4 <1.2

SB-32-0.5' 0.5 11/4/2009 <0.86 <0.86 <0.86 <1.7 <0.86SB-32-5' 5 11/4/2009 <0.89 <0.89 <0.89 <1.8 <0.89SB-32-10' 10 11/4/2009 <0.82 <0.82 <0.82 <1.6 <0.82SB-32-15' 15 11/4/2009 <0.88 <0.88 <0.88 <1.8 <0.88

SB-33-0.5' 0.5 11/4/2009 51 <0.76 3.5 <1.5 <0.76SB-33-5' 5 11/4/2009 <0.76 <0.76 <0.76 <1.5 <0.76SB-33-10' 10 11/4/2009 <0.84 <0.84 <0.84 <1.7 <0.84SB-33-15' 15 11/4/2009 <0.83 <0.83 <0.83 <1.7 <0.83

SB-34-0' 0 11/3/2009 3.8 <0.63 <0.63 <1.3 <0.63SB-34-8' 8 11/3/2009 <0.86 <0.86 <0.86 <1.7 <0.86SB-34-12' 12 11/3/2009 <0.80 <0.80 <0.80 <1.6 <0.80

SB-34-12' (DUP-2) 12 11/3/2009 <0.58 <0.58 <0.58 <1.2 <0.58

SB-35-0' 0 11/9/2009 3.2 <1.2 <1.2 <2.3 <1.2SB-35-3' 3 11/9/2009 <0.93 <0.93 <0.93 <1.9 <0.93SB-35-6' 6 11/9/2009 <0.85 <0.85 <0.85 <1.7 <0.85SB-35-9' 9 11/9/2009 <0.78 <0.78 <0.78 <1.6 <0.78

SB-36-0' 0 11/9/2009 1.5 <1.2 <1.2 <2.3 <1.2SB-36-3' 3 11/9/2009 <1.2 <1.2 <1.2 <2.5 <1.2SB-36-6' 6 11/9/2009 <0.91 <0.91 <0.91 <1.8 <0.91SB-36-9' 9 11/9/2009 <0.98 <0.98 <0.98 <2.0 <0.98

SB-37-0' 0 11/9/2009 1.4 <1.1 <1.1 <2.1 <1.1SB-37-3' 3 11/9/2009 1.3 <1.1 <1.1 <2.2 <1.1SB-37-6' 6 11/9/2009 <0.96 <0.96 <0.96 <1.9 <0.96SB-37-9' 9 11/9/2009 <1.0 <1.0 <1.0 <2.0 <1.0

SB-38-0' 0 11/9/2009 1.7 <0.95 <0.95 <1.9 <0.95SB-38-3' 3 11/9/2009 <1.1 <1.1 <1.1 <2.2 <1.1SB-38-6' 6 11/9/2009 <1.1 <1.1 <1.1 <2.1 <1.1SB-38-9' 9 11/9/2009 <1.0 <1.0 <1.0 <2.0 <1.0

SB-39-0' 0 11/9/2009 <1.1 <1.1 <1.1 <2.2 <1.1SB-39-3' 3 11/9/2009 <1.0 <1.0 <1.0 <2.1 <1.0SB-39-6' 6 11/9/2009 <1.0 <1.0 <1.0 <2.0 <1.0SB-39-9' 9 11/9/2009 <1.1 <1.1 <1.1 <2.1 <1.1

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DateSB-39-9' (DUP-6) 9 11/9/2009 <1.1 <1.1 <1.1 <2.1 <1.1

SB-40-0' 0 11/10/2009 1.1 <1.1 1.3 <2.1 <1.1SB-40-3' 3 11/10/2009 2.2 <1.2 <1.2 <2.4 <1.2SB-40-6' 6 11/10/2009 <0.97 <0.97 <0.97 <1.9 <0.97SB-40-9' 9 11/10/2009 <0.95 <0.95 <0.95 <1.9 <0.95

SB-41-0' 0 11/10/2009 1.7 <1.0 <1.0 <2.0 <1.0SB-41-3' 3 11/10/2009 <0.85 <0.85 <0.85 <1.7 <0.85SB-41-6' 6 11/10/2009 <0.99 <0.99 <0.99 <2.0 <0.99SB-41-9' 9 11/10/2009 <0.89 <0.89 <0.89 <1.8 <0.89

SB-42-0' 0 11/10/2009 3.4 <1.1 1.3 <2.2 <1.1SB-42-3' 3 11/10/2009 <0.95 <0.95 <0.95 <1.9 <0.95SB-42-6' 6 11/10/2009 <0.80 <0.80 <0.80 <1.6 <0.80SB-42-9' 9 11/10/2009 <0.86 <0.86 <0.86 <1.7 <0.86

SB-43-0' 0 11/10/2009 9.0 <0.97 1.0 <1.9 <0.97SB-43-3' 3 11/10/2009 <1.0 <1.0 <1.0 <2.1 <1.0SB-43-6' 6 11/10/2009 <0.92 <0.92 <0.92 <1.8 <0.92SB-43-9' 9 11/10/2009 <0.97 <0.97 <0.97 <1.9 <0.97

SB-44-0' 0 11/10/2009 <47 <47 67 <94 <47SB-44-3' 3 11/10/2009 <0.98 <0.98 <0.98 <2.0 <0.98SB-44-6' 6 11/10/2009 <1.0 <1.0 <1.0 <2.0 <1.0SB-44-9' 9 11/10/2009 <0.99 <0.99 <0.99 <2.0 <0.99

SB-45-0' 0 11/10/2009 1.9 <1.1 1.2 <2.2 <1.1SB-45-3' 3 11/10/2009 <1.2 <1.2 <1.2 <2.4 <1.2SB-45-6' 6 11/10/2009 <0.86 <0.86 <0.86 <1.7 <0.86SB-45-9' 9 11/10/2009 <0.88 <0.88 <0.88 <1.8 <0.88

SB-46-0' 0 11/10/2009 3.0 <0.99 1.9 <2.0 <0.99SB-46-3' 3 11/10/2009 <1.1 <1.1 <1.1 <2.2 <1.1SB-46-6' 6 11/10/2009 <0.93 <0.93 <0.93 <1.9 <0.93SB-46-9' 9 11/10/2009 <0.83 <0.83 <0.83 <1.7 <0.83

SB-47-0.5' 0.5 7/15/2010 <0.69 <0.69 <0.69 <1.4 <0.69SB-47-3' 3 7/15/2010 <0.84 <0.84 <0.84 <1.7 <0.84SB-47-6' 6 7/15/2010 <0.75 <0.75 <0.75 <1.5 <0.75

SB-48-1.5' 1.5 7/13/2010 1.6 <0.61 <0.61 <1.2 <0.61SB-48-3' 3 7/13/2010 <1.0 <1.0 <1.0 <2.0 <1.0SB-48-6' 6 7/13/2010 <0.54 <0.54 <0.54 <1.1 <0.54

SB-49-3' 3 7/13/2010 1.0 <0.55 <0.55 <1.1 <0.55SB-49-4' 4 7/13/2010 810 640 990 1,100 470SB-49-6' 6 7/13/2010 <0.61 <0.61 <0.61 <1.2 <0.61

SB-50-1.5' 1.5 7/13/2010 <30 <0.73 <0.73 <1.5 <0.73SB-50-3' 3 7/13/2010 <0.64 <0.64 <0.64 <1.3 <0.64SB-50-6' 6 7/13/2010 <0.66 <0.66 <0.66 <1.3 <0.66

SB-51-1.5' 1.5 7/13/2010 13 <0.58 0.73 <1.2 <0.58SB-51-3' 3 7/13/2010 3.4 <0.62 <0.62 <1.2 <0.62

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DateSB-51-6.5' 6.5 7/13/2010 5.4 <0.52 <0.52 <1.0 <0.52SB-51-9' A 9 7/13/2010 <0.71 <0.71 <0.71 <1.4 <0.71

SB-52-1' 1 7/12/2010 <0.69 <0.69 <0.69 <1.4 <0.69SB-52-3' 3 7/12/2010 <0.74 <0.74 <0.74 <1.5 <0.74SB-52-6' 6 7/12/2010 <0.59 <0.59 <0.59 <1.2 <0.59SB-52-9' 9 7/12/2010 <0.52 <0.52 <0.52 <1.0 <0.52SB-52-15' 15 7/12/2010 <0.53 <0.53 <0.53 <1.1 <0.53SB-52-20' 20 7/12/2010 <24* <24* <24* <49* <24*

SB-52-24.5' 24.5 7/12/2010 <0.53 <0.53 <0.53 <1.1 <0.53

SB-53-0.5' 0.5 7/12/2010 <0.58 <0.58 <0.58 <1.2 <0.58SB-53-3' 3 7/13/2010 <0.52 <0.52 <0.52 <1.0 <0.52SB-53-6' 6 7/13/2010 <0.56 <0.56 <0.56 <1.1 <0.56SB-53-9' 9 7/13/2010 <0.76 <0.76 <0.76 <1.5 <0.76SB-53-15' 15 7/13/2010 <0.62 <0.62 <0.62 <1.2 <0.62

SB-53-20.5' 20.5 7/13/2010 <30 85 <30 <59 <30SB-53-25' 25 7/13/2010 <0.63 <0.63 <0.63 <1.3 <0.63SB-54-1' 1 7/12/2010 <0.78 <0.78 <0.78 <1.6 <0.78SB-54-3' 3 7/12/2010 <0.62 <0.62 <0.62 <1.2 <0.62SB-54-6' 6 7/12/2010 <0.60 <0.60 <0.60 <1.2 <0.60SB-54-9' 9 7/12/2010 <0.67 <0.67 <0.67 <1.3 <0.67SB-54-15' 15 7/12/2010 <34* <34* <34* <67* <34*SB-54-20' 20 7/12/2010 <0.52 27 <0.52 <1.0 1.8SB-54-22' 22 7/12/2010 <26 710 <26 <52 78SB-55-1.5' 1.5 7/13/2010 <0.43 <0.43 <0.43 <0.86 <0.43SB-55-3' 3 7/13/2010 <0.57 <0.57 <0.57 <1.1 <0.57SB-55-6' 6 7/13/2010 <0.83 <0.83 <0.83 <1.7 <0.83SB-55-9' 9 7/13/2010 <0.68 <0.68 <0.68 <1.4 <0.68SB-55-15' 15 7/13/2010 <0.77 <0.77 <0.77 <1.5 <0.77SB-55-20' 20 7/13/2010 <26 240 <26 <52 41SB-55-25' 25 7/13/2010 <0.64 <0.64 <0.64 <1.3 <0.64

SB-56-0.5' 0.5 7/14/2010 <0.76 <0.76 <0.76 <1.5 <0.76SB-56-3' 3 7/14/2010 <0.66 <0.66 <0.66 <1.3 <0.66SB-56-6' 6 7/14/2010 <0.58 <0.58 <0.58 <1.2 <0.58SB-56-9' 9 7/14/2010 <0.87 <0.87 <0.87 <1.7 <0.87SB-56-15' 15 7/14/2010 <1.3 <1.3 <1.3 <2.5 <1.3

SB-56-20.5' 20.5 7/14/2010 <41* <41* <41* <82* <41*SB-56-25' 25 7/14/2010 <0.90 <0.90 <0.90 <1.8 <0.90

SB-57-20.5' 20.5 7/15/2010 <0.89 <0.89 <0.89 <1.8 <0.89

SB-58-0 0 9/22/2010 0.81 <0.21 <0.21 <0.42 <0.21SB-58-5 5 9/22/2010 <0.34 <0.34 <0.34 <0.67 <0.34SB-58-10 10 9/22/2010 <0.24 <0.24 <0.24 <0.49 <0.24

SB-59-3 3 9/22/2010 7.3 <0.55 0.64 <1.1 <0.55SB-59-5 5 9/22/2010 <0.30 <0.30 <0.30 <0.60 <0.30SB-59-10 10 9/22/2010 <0.38 <0.38 <0.38 <0.75 <0.38

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DateSB-60-0 0 9/22/2010 <0.28 <0.28 <0.28 <0.56 <0.28SB-60-5 5 9/22/2010 <0.21 <0.21 <0.21 <0.42 <0.21SB-60-10 10 9/22/2010 <0.22 <0.22 <0.22 <0.45 <0.22

SB-61-0 0 9/22/2010 <0.35 <0.35 <0.35 <0.70 <0.35SB-61-5 5 9/22/2010 <0.26 <0.26 <0.26 <0.53 <0.26SB-61-10 10 9/22/2010 <0.35 <0.35 <0.35 <0.69 <0.35

SB-62-0 0 9/22/2010 5.7 <0.38 7.2 1.0 <0.38SB-62-5 5 9/22/2010 0.75 <0.43 <0.43 <0.85 <0.43SB-62-10 10 9/22/2010 <0.35 <0.35 <0.35 <0.69 <0.35SB-62-15 15 9/23/2010 <0.25 <0.25 <0.25 <0.51 <0.25

SB-63-1 1 9/23/2010 2.0 <0.43 <0.43 <0.86 <0.43SB-63-5 5 9/23/2010 <0.31 <0.31 <0.31 <0.62 <0.31SB-63-10 10 9/23/2010 <0.30 <0.30 <0.30 <0.59 <0.30SB-63-15 15 9/23/2010 <0.34 <0.34 <0.34 <0.67 <0.34

SB-64-1 1 9/22/2010 0.35 <0.30 <0.30 <0.61 <0.30SB-64-5 5 9/22/2010 0.38 <0.30 <0.30 <0.60 <0.30SB-64-10 10 9/22/2010 <0.25 <0.25 <0.25 <0.51 <0.25SB-64-15 15 9/22/2010 <0.31 <0.31 <0.31 <0.62 <0.31

SB-65-1 1 9/23/2010 1.0 <0.27 <0.27 <0.53 <0.27SB-65-5 5 9/23/2010 1.8 <0.34 <0.34 <0.69 <0.34SB-65-10 10 9/23/2010 <0.27 <0.27 <0.27 <0.54 <0.27SB-65-15 15 9/23/2010 <0.28 <0.28 <0.28 <0.57 <0.28

SB-66-0 0 9/23/2010 <0.24 <0.24 <0.24 <0.49 <0.24SB-66-5 5 9/23/2010 <0.25 <0.25 <0.25 <0.51 <0.25SB-66-10 10 9/23/2010 <0.22 <0.22 <0.22 <0.43 <0.22

SB-67-0 0 9/23/2010 <0.34 <0.34 6.0 <0.68 <0.34SB-67-5 5 9/23/2010 <0.37 <0.37 <0.37 <0.75 <0.37SB-67-10 10 9/23/2010 <0.27 <0.27 <0.27 <0.54 <0.27

SB-68-0 0 9/23/2010 1.1 <0.38 3.4 1.3 0.58SB-68-5 5 9/23/2010 <0.29 <0.29 0.76 <0.58 <0.29SB-68-10 10 9/23/2010 0.33 <0.28 0.65 <0.56 <0.28

SB-69-0 0 9/23/2010 86 61 990 390 170SB-69-5 5 9/23/2010 <0.27 <0.27 4.9 0.70 <0.27SB-69-10 10 9/23/2010 <0.30 <0.30 0.70 <0.60 <0.30

TP-1-0.5' 0.5 7/12/2010 <0.90 <0.90 <0.90 <1.8 <0.90TP-1-3' 3 7/12/2010 <0.92 <0.92 <0.92 <1.8 <0.92TP-1-6' 6 7/12/2010 <1.1 <1.1 <1.1 <2.2 <1.1

TP-2-0.5' 0.5 7/12/2010 <1.1 <1.1 <1.1 <2.3 <1.1TP-2-3' 3 7/12/2010 <1.0 <1.0 <1.0 <2.0 <1.0TP-2-6' 6 7/12/2010 <1.1 <1.1 <1.1 <2.2 <1.1

TP-2-9' A 9 7/12/2010 <1.1 <1.1 <1.1 <2.3 <1.1

TP-3-0.5' 0.5 7/12/2010 <1.0 <1.0 <1.0 <2.1 <1.0TP-3-3' 3 7/12/2010 <1.1 <1.1 <1.1 <2.2 <1.1

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DateTP-3-6' 6 7/12/2010 <1.1 <1.1 <1.1 <2.1 <1.1

TP-4-0.5' 0.5 7/12/2010 <1.0 <1.0 <1.0 <2.1 <1.0TP-4-3' 3 7/12/2010 <1.0 <1.0 <1.0 <2.1 <1.0TP-4-6' 6 7/12/2010 <1.0 <1.0 <1.0 <2.0 <1.0

TP-5-0.5' 0.5 7/13/2010 <1.0 <1.0 <1.0 <2.1 <1.0TP-5-3' 3 7/13/2010 <1.6 <1.6 <1.6 <3.1 <1.6TP-5-6' 6 7/13/2010 <0.96 <0.96 <0.96 <1.9 <0.96

TP-6-0.5' 0.5 7/13/2010 1.5 <0.99 <0.99 <2.0 <0.99TP-6-3' 3 7/13/2010 <1.1 <1.1 <1.1 <2.2 <1.1TP-6-6' 6 7/13/2010 <1.1 <1.1 <1.1 <2.1 <1.1

TP-7-25S 1.17 7/12/2010 1.4 2.2 4.4 16 6.1TP-7-25D 2.67 7/12/2010 <0.80 <0.80 <0.80 <1.6 <0.80TP-7-40S 1.17 7/12/2010 <0.97 <0.97 <0.97 <1.9 <0.97TP-7-40D 2.67 7/12/2010 <0.85 <0.85 <0.85 <1.7 <0.85

TP-8-0.5' 0.5 7/13/2010 1.7 <1.1 <1.1 <2.3 <1.1TP-8-3' 3 7/13/2010 <1.0 <1.0 <1.0 <2.0 <1.0TP-8-6' 6 7/13/2010 <1.0 <1.0 <1.0 <2.0 <1.0

TP-9-0.5' 0.5 7/13/2010 130 <1.1 2.3 <2.2 <1.1TP-9-3' 3 7/13/2010 1.7 <1.0 <1.0 <2.0 <1.0TP-9-6' 6 7/13/2010 6.4 <1.0 <1.0 <2.0 <1.0

TP-9-9' A 9 7/13/2010 <0.95 <0.95 <0.95 <1.9 <0.95

TP-10-0.5' 0.5 7/13/2010 <1.0 <1.0 <1.0 <2.0 <1.0TP-10-3' 3 7/13/2010 <1.0 <1.0 <1.0 <2.0 <1.0TP-10-6' 6 7/13/2010 <1.1 <1.1 <1.1 <2.2 <1.1

TP-11-0.5' 0.5 7/13/2010 13 <1.2 <1.2 <2.3 <1.2TP-11-3' 3 7/13/2010 5.9 <1.3 <1.3 <2.5 <1.3TP-11-6' 6 7/13/2010 1.4 <1.1 <1.1 <2.2 <1.1

TP-11-9' A 9 7/13/2010 <1.2 <1.2 <1.2 <2.3 <1.2

AK-1-30" 2.5 7/15/2010 <1.4 <1.4 <1.4 <2.7 <1.4AK-1-38" 3.17 7/15/2010 1.8 <0.95 <0.95 <1.9 <0.95

AK-2-20" 1.7 7/15/2010 <1.0 <1.0 <1.0 <2.0 <1.0AK-2-34" 2.83 7/15/2010 <1.1 <1.1 <1.1 <2.2 <1.1AK-3-17" 1.42 7/15/2010 <1.3 <1.3 <1.3 <2.6 <1.3

Table Notes:Bold values represent positive detections.* - Elevated reporting limit due to matrix interferenceA - Sample extracted outside recommended hold time.

Abbreviations:DUP - Indicates duplicate sample.EPA - Environmental Protection Agencyug/kg - Micrograms per kilogram.

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SM 4500-NH3 B/C EPA Method 9010C/9014Ammonia (as N) Total Cyanide

(mg/kg) (mg/kg)SS-3 0 2/24/2006 -- 2.0

SB-1-0' 0 10/15/2008 -- <0.50SB-1-3' 3 10/15/2008 -- <0.50SB-1-6' 6 10/15/2008 -- <0.50SB-1-9' 9 10/15/2008 -- <0.50SB-2-0' 0 10/15/2008 -- <0.50

SB-2-0' (DUP-6) 0 10/15/2008 -- <0.50SB-2-3' 3 10/15/2008 -- <0.50SB-2-6' 6 10/15/2008 -- <0.50SB-2-9' 9 10/15/2008 -- <0.50SB-3-0' 0 10/14/2008 -- <0.50SB-3-3' 3 10/14/2008 -- <0.50SB-3-6' 6 10/14/2008 -- <0.50SB-3-9' 9 10/14/2008 -- <0.50

SB-3-9' (DUP-3) 9 10/14/2008 -- <0.50SB-3-12' 12 10/14/2008 -- <0.50SB-3-15' 15 10/14/2008 -- <0.50SB-4-0' 0 10/14/2008 -- 2.5SB-4-3' 3 10/14/2008 -- 0.94SB-4-6' 6 10/14/2008 -- <0.50SB-4-7' 7 10/14/2008 -- <0.50SB-4-9' 9 10/14/2008 -- <0.50SB-5-0' 0 10/15/2008 -- 5.2SB-5-6' 6 10/15/2008 -- <0.50SB-5-9' 9 10/15/2008 -- <0.50

SB-6-7.5' 7.5 10/14/2008 -- 2.7SB-6-9.5' 9.5 10/14/2008 -- 6.2

SB-6-12.5' 12.5 10/14/2008 -- 7.5SB-7-0' 0 10/15/2008 -- 2.0SB-7-3' 3 10/15/2008 -- <0.50SB-7-6' 6 10/15/2008 -- <0.50

SB-7-6' (DUP-4) 6 10/15/2008 -- <0.50SB-7-9' 9 10/15/2008 -- <0.50SB-8-0' 0 10/15/2008 -- <0.50SB-8-3' 3 10/15/2008 -- <0.50

SB-8-5.5' 5.5 10/15/2008 -- 13SB-8-6' 6 10/15/2008 -- 1.0SB-8-9' 9 10/15/2008 -- <0.50SB-9-0' 0 10/13/2008 -- <0.50SB-9-3' 3 10/13/2008 -- <0.50

SB-9-3' (DUP-1) 3 10/13/2008 -- <0.50SB-9-6' 6 10/13/2008 -- <0.50SB-9-9' 0 10/13/2008 -- <0.50

SB-9-9' (DUP-2) 9 10/13/2008 -- <0.50SB-10-1.5' 1.5 10/15/2008 -- <0.50SB-10-3' 3 10/15/2008 -- <0.50

SB-10-3' (DUP-5) 3 10/15/2008 -- <0.50SB-10-6' 6 10/15/2008 -- <0.50SB-10-9' 9 10/15/2008 -- <0.50

TABLE A-4Historical Soil Chemical Data - Ammonia and Cyanide





(mg/kg) (mg/kg)




SB-11-0' 0 10/14/2008 -- 4.1SB-11-3' 3 10/14/2008 -- <0.50SB-11-6' 6 10/14/2008 -- <0.50SB-11-9' 9 10/14/2008 -- <0.50

SB-11-15' 15 10/14/2008 -- <0.50SB-12-0' 0 10/14/2008 -- 0.84

SB-12-1.5' 1.5 10/14/2008 -- <0.50SB-12-3' 3 10/14/2008 -- 0.96SB-12-6' 6 10/14/2008 -- <0.50SB-12-9' 9 10/14/2008 -- <0.50

SB-12-12' 12 10/14/2008 -- <0.50SB-12-15' 15 10/14/2008 -- <0.50SB-13-0' 0 10/13/2008 -- 3.1SB-13-3' 3 10/13/2008 -- 11SB-13-6' 6 10/13/2008 -- <0.50SB-13-9' 9 10/13/2008 -- <0.50SB-14-0' 0 10/13/2008 -- 4.2SB-14-2' 2 10/13/2008 -- 7.7SB-14-3' 3 10/13/2008 -- <0.50SB-14-6' 6 10/13/2008 -- <0.50SB-14-9' 9 10/13/2008 -- <0.50SB-15-0' 0 10/13/2008 -- <0.50SB-15-3' 3 10/13/2008 -- <0.50SB-15-6' 6 10/13/2008 -- <0.50SB-15-9' 9 10/13/2008 -- <0.50SB-16-1' 1 10/13/2008 -- 0.61SB-16-3' 3 10/13/2008 -- <0.50SB-16-6' 6 10/13/2008 -- <0.50SB-16-9' 9 10/13/2008 -- <0.50SB-17-1' 1 11/5/2009 -- 9.3

SB-17-9.5' 9.5 11/6/2009 -- on holdSB-17-18' 18 11/6/2009 -- <0.50

SB-17-20.5' 20.5 11/6/2009 -- <0.50SB-17-25.5' 25.5 11/6/2009 -- <0.50

SB-18-0' 0 11/4/2009 -- 13SB-18-8' 8 11/4/2009 -- <0.50

SB-18-16' 16 11/4/2009 -- <0.50SB-18-26' 26 11/4/2009 -- 0.59

SB-18-26' (DUP-1) 26 11/4/2009 -- <0.50SB-18-65' 65 11/4/2009 -- <0.50SB-19-5' 5 11/5/2009 -- <0.50

SB-19-15.5 15.5 11/5/2009 -- <0.50SB-19-21' 21 11/5/2009 -- <0.50SB-19-28' 28 11/5/2009 -- <0.50

SB-20-0' 0 11/4/2009 -- 0.97SB-20-14' 14 11/5/2009 -- <0.50SB-20-20' 20 11/5/2009 -- <0.50

SB-20-66.5' 66.5 11/5/2009 -- <0.50SB-20-66.5' (DUP-4) 66.5 11/5/2009 -- <0.50



(mg/kg) (mg/kg)




SB-35-0' 0 11/9/2009 -- 2.0SB-35-3' 3 11/9/2009 -- <0.50SB-35-6' 6 11/9/2009 -- <0.50SB-35-9' 9 11/9/2009 -- <0.50

SB-36-0' 0 11/9/2009 -- <0.50SB-36-3' 3 11/9/2009 -- <0.50SB-36-6' 6 11/9/2009 -- <0.50SB-36-9' 9 11/9/2009 -- <0.50

SB-37-0' 0 11/9/2009 -- <0.50SB-37-3' 3 11/9/2009 -- 0.91SB-37-6' 6 11/9/2009 -- <0.50SB-37-9' 9 11/9/2009 -- <0.50

SB-38-0' 0 11/9/2009 -- <0.50SB-38-3' 3 11/9/2009 -- 0.51SB-38-6' 6 11/9/2009 -- <0.50SB-38-9' 9 11/9/2009 -- <0.50

SB-39-0' 0 11/9/2009 -- <0.50SB-39-3' 3 11/9/2009 -- <0.50SB-39-6' 6 11/9/2009 -- <0.50SB-39-9' 9 11/9/2009 -- <0.50

SB-39-9' (DUP-6) 9 11/9/2009 -- <0.50

SB-40-0' 0 11/10/2009 -- <0.50SB-40-3' 3 11/10/2009 -- <0.50SB-40-6' 6 11/10/2009 -- <0.50SB-40-9' 9 11/10/2009 -- <0.50

SB-41-0' 0 11/10/2009 -- <0.50SB-41-3' 3 11/10/2009 -- <0.50SB-41-6' 6 11/10/2009 -- <0.50SB-41-9' 9 11/10/2009 -- <0.50

SB-42-0' 0 11/10/2009 -- <0.50SB-42-3' 3 11/10/2009 -- <0.50SB-42-6' 6 11/10/2009 -- <0.50SB-42-9' 9 11/10/2009 -- <0.50

SB-43-0' 0 11/10/2009 -- 0.68SB-43-3' 3 11/10/2009 -- <0.50SB-43-6' 6 11/10/2009 -- <0.50SB-43-9' 9 11/10/2009 -- <0.50

SB-44-0' 0 11/10/2009 -- <0.50SB-44-3' 3 11/10/2009 -- <0.50SB-44-6' 6 11/10/2009 -- <0.50SB-44-9' 9 11/10/2009 -- <0.50

SB-45-0' 0 11/10/2009 -- <0.50SB-45-3' 3 11/10/2009 -- <0.50SB-45-6' 6 11/10/2009 -- <0.50SB-45-9' 9 11/10/2009 -- <0.50

SB-46-0' 0 11/10/2009 -- <0.50SB-46-3' 3 11/10/2009 -- <0.50SB-46-6' 6 11/10/2009 -- <0.50SB-46-9' 9 11/10/2009 -- <0.50



(mg/kg) (mg/kg)




SB-55-1.5' 1.5 7/13/2010 45 <0.50SB-55-3' 3 7/13/2010 50 <0.50SB-55-6' 6 7/13/2010 17 <0.50SB-55-9' 9 7/13/2010 5.6 <0.50

SB-55-15' 15 7/13/2010 5.6 <0.50SB-55-20' 20 7/13/2010 11 <0.50SB-55-25' 25 7/13/2010 5.6 <0.50

SB-56-0.5' 0.5 7/14/2010 310 3.8SB-56-3' 3 7/14/2010 200 0.51SB-56-6' 6 7/14/2010 56 <0.50SB-56-9' 9 7/14/2010 11 <0.50

SB-56-15' 15 7/14/2010 5.6 <0.50SB-56-20.5' 20.5 7/14/2010 11 <0.50SB-56-25' 25 7/14/2010 5.6 <0.50

Table Notes:Bold values represent positive detections.< - Indicates constituent not detected at concentrations equal to or greater than the specified reporting limit.

Abbreviations:DUP - Indicates duplicate sample.EPA - Environmental Protection AgencyNA - Not analyzed.mg/kg - Milligrams per kilogram


BaP

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Nap

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1-M

ethy

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lene

2-M

ethy

lnap

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Ace

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Ace

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SS-1 0 2/24/2006 0.43946 <1.65 -- <1.65 <1.65 <1.65 <1.65 0.100 <1.65 0.170 0.230 0.064 0.056 0.140 0.170 0.110 <1.65 0.220 0.110SS-2 0 2/24/2006 7.4624 0.540 -- 0.180 0.760 0.043 0.091 5.2 0.340 9.4 12 2.4 4.1 7.4 9.1 4.7 0.710 8.6 5.9SS-3 0 2/24/2006 170.07 5.0 -- 0.240 15 0.340 1.6 140 6.8 300 340 83 95 180 220 110 13 95 64SS-4 0 2/24/2006 23.38 5.1 -- 0.590 5.8 0.270 2.1 45 3.6 43 49 11 14 23 4.5 18 1.5 11 8.8SS-5 0 2/24/2006 1.09904 <1.65 -- <1.65 0.160 <1.65 <1.65 0.810 0.088 1.5 1.9 0.370 0.550 1.0 1.3 0.750 0.081 0.750 0.490SS-6 0 2/24/2006 0.28875 U <0.330 -- <0.330 <0.330 <0.330 <0.330 <0.330 <0.330 <0.330 <0.330 <0.330 <0.330 <0.330 <0.330 <0.330 <0.330 <0.330 <0.330SS-7 0 2/24/2006 87.11 15 -- 0.800 11 0.290 1.9 88 4.7 120 150 30 43 82 100 60 7.0 48 31SS-8 0 2/24/2006 43.346 3.3 -- 0.220 3.9 0.092 0.660 23 1.7 40 51 13 19 46 57 29 3.4 28 14SS-9 0 2/24/2006 9.7702 0.960 -- 0.058 1.7 0.055 0.200 10 0.750 18 23 4.0 4.9 9.0 2.5 7.5 0.680 7.9 4.4

SB-1-0' 0 10/15/2008 0.43838 0.041 -- -- 0.130 0.019 <0.010 0.300 0.027 0.660 0.800 0.160 0.220 0.290 0.130 0.330 0.027 0.330 0.390SB-1-3' 3 10/15/2008 0.02025 <0.015 -- -- <0.030 0.088 <0.010 <0.010 0.032 0.020 0.021 <0.010 <0.010 0.014 <0.010 0.014 <0.010 0.013 0.021SB-1-6' 6 10/15/2008 0.00925 <0.015 -- -- <0.030 <0.015 <0.010 0.012 <0.010 0.017 0.019 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 0.012 0.01SB-1-9' 9 10/15/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-2-0' 0 10/15/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010SB-2-0' (DUP-6) 0 10/15/2008 0.03986 <0.015 -- -- <0.030 <0.015 <0.010 0.053 <0.010 0.070 0.082 0.013 0.016 0.026 <0.010 0.030 <0.010 0.039 0.036

SB-2-3' 3 10/15/2008 0.00875 U 0.016 -- -- <0.030 0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010SB-2-6' 6 10/15/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010SB-2-9' 9 10/15/2008 0.09633 <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 0.058 0.068 0.019 0.023 0.055 0.022 0.076 <0.010 0.091 0.088SB-3-0' 0 10/14/2008 0.5109 0.570 -- -- <0.150 <0.075 <0.050 0.340 <0.050 0.650 0.790 0.190 0.340 0.350 0.190 0.370 <0.050 0.620 0.560SB-3-3' 3 10/14/2008 0.3121 0.230 -- -- <0.150 <0.075 <0.050 0.110 <0.050 0.410 0.440 0.100 0.200 0.220 0.066 0.230 <0.050 0.340 0.330SB-3-6' 6 10/14/2008 0.5062 0.350 -- -- <0.150 <0.075 <0.050 0.490 <0.050 0.870 1.000 0.150 0.270 0.330 0.140 0.380 <0.050 0.590 0.530SB-3-9' 9 10/14/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 0.062 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-3-9' (DUP-3) 9 10/14/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-4-0' 0 10/14/2008 0.9624 0.140 -- -- <0.060 <0.030 <0.020 0.450 0.027 1.40 1.40 0.330 0.600 0.670 0.250 0.730 <0.020 1.10 0.980SB-4-3' 3 10/14/2008 0.6333 0.540 -- -- <0.150 <0.075 <0.050 0.400 <0.050 0.980 1.20 0.240 0.480 0.540 0.170 0.440 <0.050 0.880 0.850SB-4-6' 6 10/14/2008 0.216 <0.150 -- -- <0.300 <0.150 <0.100 0.130 <0.100 0.240 0.330 <0.100 0.300 0.140 <0.100 0.150 <0.100 0.250 0.220SB-4-7' 7 10/14/2008 3.818 0.950 -- -- <0.600 <0.300 <0.200 2.90 <0.200 6.30 6.40 1.60 2.40 3.00 1.20 2.80 <0.200 4.10 3.80SB-4-9' 9 10/14/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 0.073 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-5-0' 0 10/15/2008 29.16 1.40 -- -- <3.00 <1.50 <1.00 41.0 1.70 71.0 62.0 12.0 22.0 29.0 8.70 20.0 <1.00 37.0 38.0SB-5-6' 6 10/15/2008 0.00925 0.020 -- -- <0.030 <0.015 <0.010 0.033 <0.010 0.028 0.033 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 0.011 0.010SB-5-9' 9 10/15/2008 0.00875 U 0.042 -- -- <0.030 <0.015 <0.010 0.021 <0.010 0.016 0.020 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-6-7.5' 7.5 10/14/2008 7.217 12.0 -- -- <3.00 <1.50 <1.00 13.0 <1.00 14.0 16.0 2.10 3.70 4.40 1.60 5.60 <1.00 6.60 6.00SB-6-9.5' 9.5 10/14/2008 53.8 790 -- -- <60.0 <30.0 <20.0 170 <20.0 120 140 <20.0 30.0 27.0 <20.0 42.0 <20.0 37.0 34.0SB-6-12.5' 12.5 10/14/2008 117.57 1,500 -- -- 130 <30.0 42.0 450 44.0 310 360 46.0 67.0 66.0 28.0 92.0 <20.0 77.0 75.0

SB-7-0' 0 10/15/2008 95.72 180 -- -- 20.0 <7.50 10.0 220 13.0 280 300 39 54 68 30 69 12 80 84SB-7-3' 3 10/15/2008 0.5872 0.420 -- -- <0.150 <0.075 <0.050 0.91 <0.050 1.20 1.50 0.2 0.27 0.41 0.17 0.44 <0.050 0.68 0.58SB-7-6' 6 10/15/2008 33.238 27.0 -- -- <6.00 <3.00 2.50 70.0 3.30 81.0 97.0 12 17 24 9.4 24 4.2 38 31

SB-7-6' (DUP-4) 6 10/15/2008 1.481 1.40 -- -- <0.300 <0.150 <0.100 2.70 0.150 3.10 3.8 0.53 0.7 1.1 0.44 1.1 <0.100 1.4 1.5SB-7-9' 9 10/15/2008 0.00875 U 0.048 -- -- <0.030 0.016 <0.010 <0.010 <0.010 <0.010 0.014 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-8-0' 0 10/15/2008 0.04375 U <0.075 -- -- 2.1 <0.075 <0.050 <0.050 <0.050 0.089 0.099 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050 <0.050SB-8-3' 3 10/15/2008 0.00875 U <0.015 -- -- 0.061 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-8-5.5' 5.5 10/15/2008 53.255 67 -- -- <7.5 9.6 4.5 89 7 100 130 17 23 35 14 41 <2.5 57 50SB-8-6' 6 10/15/2008 0.03745 <0.015 -- -- <0.030 <0.015 <0.010 0.023 <0.010 0.024 0.034 <0.010 <0.010 0.012 <0.010 0.033 <0.010 0.29 <0.010SB-8-9' 9 10/15/2008 0.00875 U <0.015 -- -- <0.030 0.037 <0.010 0.012 <0.010 0.09 0.14 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-9-0' 0 10/13/2008 4.812 0.52 -- -- <0.60 <0.30 <0.20 4.5 0.26 7.5 9.3 1.5 2 3.3 1.4 3.6 0.3 5 4.7SB-9-3' 3 10/13/2008 0.13855 0.027 -- -- <0.030 <0.015 0.01 0.022 <0.010 0.11 0.14 0.03 0.037 0.093 0.034 0.1 0.022 0.16 0.15

SB-9-3' (DUP-1) 3 10/13/2008 0.04043 <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 0.028 0.048 <0.010 0.013 0.03 <0.010 0.03 <0.010 0.06 0.046SB-9-6' 6 10/13/2008 1.1576 0.2 -- -- <0.150 <0.075 <0.050 0.55 <0.050 1.1 1.5 0.28 0.31 0.8 0.28 0.89 <0.050 1.5 1.2

Pacific Gas and Electric Company Former Manufactured Gas SiteHistorical Soil Chemical Data - PAHs

TABLE A-5

PAHs (mg/kg)EPA METHOD 3545/8310

Depth(feet) DateSample ID

712 S. Sacramento Street, Lodi, California

1 of 8

BaP

Equ

ival

ent

Nap

htha

lene

1-M

ethy

lnap

htha

lene

2-M

ethy

lnap

htha

lene

Ace

naph

thyl

ene

Ace

naph

then

e

Fluo

rene

Phe

nant

hren

e

Ant

hrac

ene

Fluo

rant

hene

Pyr

ene

Ben

zo(a

)ant

hrac

ene

*

Chr

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Ben

zo(b

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*

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zo(a

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ene*

Dib

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Ant

hrac

ene

*

Ben

zo(g

,h,i)

Per

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Inde

no(1

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-cd)

pyre

ne*


TABLE A-5




SB-9-9' 9 10/13/2008 0.01635 0.041 -- -- <0.030 <0.015 <0.010 0.015 <0.010 0.023 0.023 <0.010 <0.010 0.01 <0.010 0.011 <0.010 0.017 0.016SB-9-9' (DUP-2) 9 10/13/2008 0.2145 0.21 -- -- 0.033 <0.015 0.011 0.26 0.011 0.47 0.53 0.065 0.12 0.15 0.061 0.16 <0.010 0.29 0.24

SB-10-1.5' 0 10/15/2008 3.264 2.7 -- -- <1.50 <0.750 <0.500 7.1 <0.500 8.1 10 1.3 1.6 2.4 0.83 2.4 <0.500 3.5 3.1SB-10-3' 3 10/15/2008 0.46385 <0.015 -- -- 0.052 <0.015 <0.010 0.031 <0.010 0.25 0.4 0.072 0.095 0.3 0.1 0.37 <0.010 0.47 0.44

SB-10-3' (DUP-5) 3 10/15/2008 0.53266 0.031 -- -- 0.039 0.036 <0.010 0.05 <0.010 0.31 0.46 0.098 0.014 0.32 0.12 0.41 0.058 0.56 0.49SB-10-6' 6 10/15/2008 0.4164 0.018 -- -- <0.030 0.029 <0.010 0.061 <0.010 0.32 0.47 0.097 0.11 0.25 0.09 0.32 0.04 0.42 0.38SB-10-9' 9 10/15/2008 0.00875 U 0.22 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 0.043 <0.010

SB-11-0' 0 10/14/2008 1.4728 0.24 -- -- <0.300 <0.150 <0.100 1.1 <0.100 2.1 2.2 0.47 0.88 1 0.4 1.1 <0.100 1.8 1.6SB-11-3' 3 10/14/2008 0.02864 0.028 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 0.029 0.036 <0.010 0.014 0.019 <0.010 0.021 <0.010 0.034 0.029SB-11-6' 6 10/14/2008 0.01212 0.034 -- -- <0.030 <0.015 <0.010 0.025 <0.010 0.037 0.038 <0.010 0.022 0.022 <0.010 <0.010 <0.010 0.038 0.02SB-11-9' 9 10/14/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010SB-11-15' 15 10/14/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-12-0' 0 10/14/2008 1.3253 0.4 -- -- <0.300 <0.150 <0.100 1 <0.100 2 2 0.41 0.73 0.86 0.34 1 <0.100 1.8 1.4SB-12-1.5' 1.5 10/14/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010SB-12-3' 3 10/14/2008 35.86 6.8 -- -- <3.00 <1.50 1.3 32 2.1 31 47 12 19 24 12 27 <1.00 39 37SB-12-6' 6 10/14/2008 8.4462 2.6 -- -- 0.83 <0.300 0.25 7.3 0.5 7.9 13 2.9 5.1 5.6 1.9 6.5 0.28 8.2 7.6SB-12-9' 9 10/14/2008 0.7633 0.71 -- -- <0.300 <0.150 <0.100 1.1 <0.100 1.2 1.3 0.25 0.43 0.46 0.13 0.58 <0.100 0.77 0.78SB-12-12' 12 10/14/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010SB-12-15' 15 10/14/2008 0.01215 <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 0.015 <0.010 <0.010

SB-13-0' 0 10/13/2008 93.766 19 -- -- <15 <7.5 6.4 120 11 190 220 44 53 70 33 68 5.4 78 87SB-13-3' 3 10/13/2008 28.406 3.4 -- -- <6.0 <3.0 <2.0 44 3.3 66 72 13 16 21 9.5 20 4.4 21 24SB-13-6' 6 10/13/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010SB-13-9' 9 10/13/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-14-0' 0 10/13/2008 2.1936 0.68 -- -- 0.2 0.084 0.096 2.5 0.13 3.9 4.6 0.69 1 1.6 0.57 1.6 0.14 2.7 2.5SB-14-2' 2 10/13/2008 84.71 510 -- -- 60 12 20 250 22 200 240 38 46 54 23 66 <5.0 63 59SB-14-3' 3 10/13/2008 71.06 460 -- -- 50 <7.5 16 210 19 180 200 32 41 45 20 55 <5.0 49 51SB-14-6' 6 10/13/2008 19.628 170 -- -- <15 <7.5 <5.0 57 5.4 45 51 8.3 9.8 12 <5.0 15 <5.0 15 14SB-14-9' 9 10/13/2008 0.00875 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-15-0' 0 10/13/2008 14.619 4.1 -- -- <3.0 1.6 1.1 28 2.4 39 39 6.1 7.9 10 4.6 11 <1.0 13 13SB-15-3' 3 10/13/2008 10.078 3 -- -- <1.5 <0.750 <0.500 12 0.52 18 21 3.8 5.3 7.6 3.3 7.2 0.75 11 11SB-15-6' 6 10/13/2008 2.498 <0.750 -- -- <1.5 <0.750 <0.500 3.6 <0.500 4.9 5.9 0.93 1.3 1.9 0.67 1.8 <0.500 3.1 2.5SB-15-9' 9 10/13/2008 0.0175 U <0.030 -- -- 0.079 <0.030 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-16-1' 1 10/13/2008 16.2166 1.6 -- -- <1.5 <0.750 <0.500 22 1.2 36 40 5.7 8.1 12 4.8 12 0.84 17 16SB-16-3' 3 10/13/2008 0.09889 0.15 -- -- <0.060 0.34 <0.20 0.11 <0.20 0.18 0.2 0.034 0.049 0.074 0.026 0.068 0.035 0.12 0.051SB-16-6' 6 10/13/2008 0.21505 <0.30 -- -- <0.060 <0.030 0.027 0.082 <0.20 0.23 0.23 0.047 0.085 0.1 0.031 0.078 0.34 0.21 0.028SB-16-9' 9 10/13/2008 0.0175 U <0.015 -- -- <0.030 <0.015 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010 <0.010

SB-17-1' 1 11/5/2009 4.1594 0.79 0.35 0.47 0.78 <0.20 <0.20 3.3 0.38 5.2 5.8 1.3 2.0 2.9 1.8 3.0 0.41 5.5 4.0SB-17-18' 18 11/6/2009 0.1762 <0.20 <0.20 <0.20 <0.20 0.22 0.62 <0.20 <0.20 <0.20 <0.20 <0.20 0.22 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20

SB-17-20.5' 20.5 11/6/2009 0.3587 4.8 7.9 8.5 <0.20 0.25 2.5 1.2 4.9 0.27 0.77 0.35 0.97 <0.20 <0.20 0.25 <0.20 <0.20 <0.20SB-17-25.5' 25.5 11/6/2009 0.0175 U 0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-18-0' 0 11/4/2009 56.814 11 <5.0 <5.0 7.7 <5.0 <5.0 66 <5.0 100 130 23 38 57 37 33 5.1 140 100SB-18-8' 8 11/4/2009 0.2101 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.210 <0.10 0.310 <0.10 <0.10 0.170 <0.10 <0.10 <0.10SB-18-16' 16 11/4/2009 0.993 0.47 <0.10 <0.10 0.44 0.33 0.17 0.34 1.6 2.0 2.2 0.43 0.72 <0.10 1.1 0.77 0.12 1.5 0.17SB-18-26' 26 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-18-26' (DUP-1) 26 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-18-65' 65 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-19-5' 5 11/5/2009 0.0175 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-19-15.5 15.5 11/5/2009 0.3555 1.8 5.3 7.6 <0.40 0.90 3.2 0.59 <0.40 <0.40 0.6 <0.40 0.75 <0.40 <0.40 <0.40 <0.40 <0.40 <0.40

2 of 8

BaP

Equ

ival

ent

Nap

htha

lene

1-M

ethy

lnap

htha

lene

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TABLE A-5




SB-19-21' 21 11/5/2009 0.3547 4.8 7.2 8.3 <0.40 0.90 2.4 4.1 <0.40 <0.40 0.44 <0.40 0.67 <0.40 <0.40 <0.40 <0.40 <0.40 <0.40SB-19-28' 28 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-20-0' 0 11/4/2009 5.2528 0.62 <0.40 <0.40 0.67 <0.40 <0.40 2.1 <0.40 4.5 6.5 1.6 2.2 3.3 2.3 3.7 0.62 9.2 6.0SB-20-14' 14 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-20-20' 20 11/5/2009 0.0394 0.087 0.33 <0.040 <0.040 0.15 0.35 <0.040 <0.040 <0.040 0.088 0.053 0.13 <0.040 <0.040 <0.040 <0.040 <0.040 <0.040

SB-20-66.5' 66.5 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-20-66.5' (DUP-4) 66.5 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-21-0' 0 11/3/2009 0.4091 0.054 <0.040 <0.040 <0.040 <0.040 <0.040 0.39 <0.040 0.58 0.57 0.16 0.23 0.30 0.19 0.30 <0.040 0.52 0.35SB-21-5' 5 11/2/2009 1.4182 0.290 <0.10 <0.10 0.200 <0.10 <0.10 1.7 0.11 2.3 2.4 0.70 0.78 0.87 0.79 1.0 0.16 1.6 1.2SB-21-10' 10 11/2/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-22-0' 0 11/2/2009 18.79 16 <2.0 <2.0 9.4 <2.0 3.7 47 3.2 44 52 9.5 11 11 8.9 14 <2.0 19 14SB-22-5' 5 11/2/2009 2.607 0.46 <0.20 <0.20 0.47 <0.20 <0.20 3.1 0.22 3.7 4.9 1.2 1.3 1.6 1.2 1.9 <0.20 3.6 2.6SB-22-10' 10 11/2/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-23-0' 0 11/2/2009 25.846 3.4 <2.0 <2.0 2.7 <2.0 <2.0 14 <2.0 34 40 9.0 13 22 13 17 2.4 46 35SB-23-10' 10 11/2/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-23-12' 12 11/2/2009 23.88 3.3 <2.0 <2.0 2.5 <2.0 <2.0 20 <2.0 39 50 8.3 12 19 9.9 17 <2.0 37 27SB-23-15' 15 11/2/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-24-0' 0 11/2/2009 0.5336 0.10 <0.10 <0.10 0.11 <0.10 <0.10 0.55 <0.10 0.75 0.88 0.21 0.26 0.32 0.27 0.38 <0.10 0.74 0.54SB-24-5' 5 11/2/2009 0.6613 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.39 <0.10 0.63 0.83 0.19 0.23 0.41 0.29 0.46 <0.10 1.3 0.93SB-24-10' 10 11/2/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-25-0' 0 11/2/2009 62.4 24 <5.0 <5.0 9.8 <5.0 <5.0 99 7.3 120 150 27 35 39 30 46 <5.0 74 56SB-25-5' 5 11/2/2009 0.0175 U <0.020 <0.020 <0.020 0.024 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-25-10' 10 11/2/2009 0.0175 U <0.020 <0.020 <0.020 0.051 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-26-0.5' 0.5 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.020 <0.020SB-26-5' 5 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-26-15' 15 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-27-0.5' 0.5 11/5/2009 1.8614 <0.020 <0.020 <0.020 0.24 <0.020 <0.020 3.8 <0.020 3.7 4.6 0.95 1.3 1.0 1.1 1.4 <0.020 1.6 1.4SB-27-5' 5 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-27-10' (DUP-5) 10 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-27-15' 15 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-28-0.5' 8 11/5/2009 0.61776 0.051 <0.020 <0.020 0.066 <0.020 <0.020 0.30 0.040 0.60 0.84 0.25 0.33 0.36 0.34 0.44 0.069 0.67 0.56SB-28-8' 8 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-28-15' 15 11/5/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-29-0.5' 0.5 11/4/2009 0.2243 <0.020 <0.020 <0.020 0.10 <0.020 <0.020 0.065 <0.020 0.19 0.27 0.078 0.11 0.14 0.14 0.16 <0.020 0.31 0.24SB-29-5' 5 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 0.032 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-29-10' 10 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 0.035 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-29-13' 13 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-30-0.5' 0.5 11/4/2009 0.63068 0.086 <0.020 <0.020 0.061 <0.020 <0.020 0.19 0.029 0.45 0.63 0.20 0.29 0.36 0.32 0.46 0.067 0.74 0.57SB-30-5' 5 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-30-5' (DUP-3) 5 11/4/2009 0.0187 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.027 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.028 0.022SB-30-10' 10 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-30-13' 13 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 0.083 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-31-0.5' 0.5 11/4/2009 0.08693 0.026 <0.020 <0.020 <0.020 <0.020 <0.020 0.047 <0.020 0.10 0.15 0.037 0.043 0.062 0.049 0.060 <0.020 0.12 0.083SB-31-5' 5 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 0.030 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-31-10' 10 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 0.021 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-31-15' 15 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-32-0.5' 0.5 11/4/2009 0.3656 <0.020 <0.020 <0.020 0.039 <0.020 <0.020 0.40 0.040 0.57 0.76 0.14 0.22 0.26 0.22 0.26 <0.020 0.55 0.38

3 of 8

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TABLE A-5




SB-32-5' 5 11/4/2009 0.0779 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.076 <0.020 0.13 0.14 0.032 0.040 0.057 0.038 0.055 <0.020 0.10 0.064SB-32-10' 10 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 0.045 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-32-15' 15 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-33-0.5' 0.5 11/4/2009 153.14 49 <10 <10 41 <10 <10 340 <10 290 350 78 110 83 85 110 16 150 120SB-33-5' 5 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-33-10' 10 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 0.029 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-33-15' 15 11/4/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 0.13 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-34-0' 0 11/3/2009 18.978 3.6 <2.0 <2.0 <2.0 <2.0 <2.0 16 <2.0 25 34 8.4 9.8 11 9.0 14 <2.0 21 17SB-34-8' 8 11/3/2009 0.0875 U <0.10 <0.10 <0.10 0.12 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.31 <0.10SB-34-12' 12 11/3/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-34-12' (DUP-2) 12 11/3/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-35-0' 0 11/9/2009 10.487 2.1 <0.50 <0.50 0.86 <0.50 <0.50 7.3 <0.50 11 15 4.1 5.3 6.0 5.0 7.6 1.1 12 9.5SB-35-3' 3 11/9/2009 0.09929 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.053 <0.020 0.085 0.15 0.040 0.049 0.058 0.056 0.070 <0.020 0.13 0.10SB-35-6' 6 11/9/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 0.044 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-35-9' 9 11/9/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-36-0' 0 11/9/2009 0.4333 1.3 0.13 0.18 <0.10 <0.10 <0.10 0.24 <0.10 0.33 0.49 0.17 0.23 0.32 0.26 0.29 <0.10 0.66 0.49SB-36-3' 3 11/9/2009 0.7414 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.22 <0.10 0.54 0.78 0.24 0.34 0.54 0.39 0.51 <0.10 1.2 0.94SB-36-6' 6 11/9/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-36-9' 9 11/9/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-37-0' 0 11/9/2009 0.175 U 5.8 0.36 0.57 <0.20 <0.20 <0.20 0.21 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20SB-37-3' 3 11/9/2009 3.276 0.66 <0.40 <0.40 <0.40 <0.40 <0.40 0.71 <0.40 2.8 4.1 1.1 1.8 2.7 1.5 2.3 <0.40 4.5 3.6SB-37-6' 6 11/9/2009 0.0193 0.040 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.028 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.028 0.028SB-37-9' 9 11/9/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-38-0' 0 11/9/2009 1.83 5.0 <0.40 0.49 <0.40 <0.40 <0.40 1.2 <0.40 1.4 1.7 0.98 1.4 1.0 1.3 1.3 <0.40 1.1 1.2SB-38-3' 3 11/9/2009 0.2738 0.16 <0.020 0.022 0.023 <0.020 <0.020 0.067 <0.020 0.17 0.26 0.10 0.14 0.19 0.16 0.20 <0.020 0.30 0.24SB-38-6' 6 11/9/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-38-9' 9 11/9/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-39-0' 0 11/9/2009 0.175 U 2.2 <0.20 0.24 <0.20 <0.20 <0.20 0.20 <0.20 <0.20 0.22 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20SB-39-3' 3 11/9/2009 0.0175 U 0.36 0.024 0.035 <0.020 <0.020 <0.020 0.027 <0.020 0.025 0.032 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-39-6' 6 11/9/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-39-9' 9 11/9/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-39-9' (DUP-6) 9 11/9/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-40-0' 0 11/10/2009 0.07357 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.024 <0.020 0.035 0.044 0.032 0.047 0.051 0.041 0.052 <0.020 0.063 0.053SB-40-3' 3 11/10/2009 0.12601 0.039 <0.020 <0.020 0.023 <0.020 <0.020 0.041 <0.020 0.12 0.11 0.040 0.051 0.060 0.061 0.092 <0.020 0.31 0.14SB-40-6' 6 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-40-9' 9 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-41-0' 0 11/10/2009 0.1271 1.4 0.11 0.16 <0.020 <0.020 <0.020 0.10 <0.020 0.076 0.083 0.056 0.080 0.084 0.076 0.093 <0.020 0.093 0.083SB-41-3' 3 11/10/2009 0.0175 U 0.037 <0.020 <0.020 <0.020 <0.020 <0.020 0.029 <0.020 0.030 0.043 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.026 <0.020SB-41-6' 6 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-41-9' 9 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-42-0' 0 11/10/2009 0.10358 0.12 0.065 0.090 <0.020 <0.020 <0.020 0.046 <0.020 0.037 0.047 0.042 0.058 0.072 0.065 0.074 <0.020 0.082 0.077SB-42-3' 3 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-42-6' 6 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-42-9' 9 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-43-0' 0 11/10/2009 5.348 0.86 <0.20 <0.20 0.50 <0.20 <0.20 5.0 0.46 6.6 8.1 2.1 2.8 3.3 2.8 3.9 0.50 5.3 4.3SB-43-3' 3 11/10/2009 0.04853 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.044 0.061 <0.020 0.023 0.031 0.024 0.034 <0.020 0.058 0.044SB-43-6' 6 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-43-9' 9 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

4 of 8

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TABLE A-5




SB-44-0' 0 11/10/2009 0.04512 1.3 0.15 0.24 <0.020 <0.020 <0.020 0.10 <0.020 0.043 0.045 0.026 0.042 0.036 0.032 0.029 <0.020 0.030 0.029SB-44-3' 3 11/10/2009 0.22423 0.078 <0.020 <0.020 0.045 <0.020 <0.020 0.049 <0.020 0.13 0.16 0.059 0.093 0.17 0.11 0.16 <0.020 0.34 0.26SB-44-6' 6 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-44-9' 9 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-45-0' 0 11/10/2009 0.11995 6.9 0.55 0.81 <0.020 <0.020 0.040 0.28 0.040 0.10 0.087 0.055 0.085 0.088 0.081 0.086 <0.020 0.069 0.073SB-45-3' 3 11/10/2009 0.08986 0.24 <0.020 0.021 <0.020 <0.020 <0.020 0.025 <0.020 0.064 0.087 0.030 0.046 0.073 0.049 0.063 <0.020 0.093 0.078SB-45-6' 6 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-45-9' 9 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-46-0' 0 11/10/2009 0.4257 1.1 <0.10 0.14 <0.10 <0.10 <0.10 0.16 <0.10 0.19 0.23 0.17 0.27 0.29 0.28 0.30 <0.10 0.31 0.32SB-46-3' 3 11/10/2009 0.0175 U 0.055 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-46-6' 6 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-46-9' 9 11/10/2009 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-47-0.5' 0.5 7/15/2010 25.486 1.2 <1.0 <1.0 2.3 <1.0 <1.0 22 1.3 39 47 9.1 16 19 14 18 2.4 35 23SB-47-3' 3 7/15/2010 0.18134 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.076 <0.020 0.21 0.24 0.051 0.11 0.14 0.11 0.12 0.021 0.35 0.23SB-47-6' 6 7/15/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-48-1.5' 1.5 7/13/2010 91.048 9.6 <4.0 <4.0 11 <4.0 <4.0 71 12 96 120 25 36 42 35 72 8.2 83 57SB-48-3' 3 7/13/2010 7.6314 1.2 <0.50 <0.50 0.95 <0.50 <0.50 7.2 1.2 9.9 12 2.2 3.0 3.4 3.1 6.0 0.71 7.2 4.9SB-48-6' 6 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-49-3' 3 7/13/2010 17.712 4.9 <1.0 <1.0 2.7 <1.0 <1.0 6.5 1.3 10 13 3.5 5.4 7.8 6.5 14 1.7 22 13SB-49-4' 4 7/13/2010 4,998 23,000 <1,000 1,000 4,100 <1,000 1,400 13,000 2,400 9,800 10,000 2,000 2,800 2,200 2,200 3,900 <1,000 3,400 2,600SB-49-6' 6 7/13/2010 0.26264 0.17 <0.020 <0.020 0.13 <0.020 0.042 0.65 0.079 0.49 0.54 0.10 0.15 0.12 0.10 0.21 0.021 0.16 0.12

SB-50-1.5' 1.5 7/13/2010 43.67 <4.0 <4.0 <4.0 <4.0 <4.0 <4.0 25 <4.0 56 61 13 19 20 20 34 <4.0 54 35SB-50-3' 3 7/13/2010 0.10026 <0.020 <0.020 <0.020 0.033 <0.020 <0.020 0.049 <0.020 0.13 0.17 0.034 0.046 0.047 0.046 0.076 <0.020 0.12 0.077SB-50-6' 6 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-51-1.5' 1.5 7/13/2010 2.3704 0.34 <0.20 <0.20 0.36 <0.20 <0.20 2.1 <0.20 2.7 2.7 0.78 1.1 1.2 1.1 1.8 0.21 2.6 1.8SB-51-3' 3 7/13/2010 0.58588 0.27 <0.020 <0.020 0.086 <0.020 <0.020 0.53 0.046 0.60 0.82 0.18 0.28 0.28 0.25 0.45 0.062 0.59 0.41

SB-51-6.5' 6.5 7/13/2010 9,824 <1,000 <1,000 <1,000 1,400 <1,000 <1,000 9,600 <1,000 20,000 21,000 3,300 4,400 4,600 4,700 7,600 <1,000 11,000 7,500SB-51-9' A 9 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-52-1' 1 7/12/2010 0.18227 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.041 <0.020 0.13 0.19 0.043 0.057 0.086 0.070 0.14 0.020 0.24 0.15SB-52-3' 3 7/12/2010 0.0711 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.055 0.082 0.023 0.030 0.037 0.031 0.052 <0.020 0.10 0.063SB-52-6' 6 7/12/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-52-9' 9 7/12/2010 0.0175 U 0.040 0.030 0.062 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-52-15' 15 7/12/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-52-20' 20 7/12/2010 0.3529 <0.40 <0.40 <0.40 <0.40 0.65 1.3 <0.40 <0.40 <0.40 <0.40 <0.40 0.49 <0.40 <0.40 <0.40 <0.40 <0.40 <0.40

SB-52-24.5' 24.5 7/12/2010 0.0175 U 0.062 <0.020 0.025 <0.020 <0.020 <0.020 0.087 <0.020 0.059 0.065 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.024 <0.020

SB-53-0.5' 0.5 7/12/2010 0.10622 <0.040 <0.040 <0.040 <0.040 <0.040 <0.040 0.087 <0.040 0.14 0.16 <0.040 0.052 0.059 0.050 0.073 <0.040 0.28 0.13SB-53-3' 3 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-53-6' 6 7/13/2010 0.3375 <0.040 <0.040 <0.040 0.054 <0.040 <0.040 0.25 <0.040 0.50 0.45 0.10 0.17 0.21 0.15 0.25 <0.040 0.53 0.33SB-53-9' 9 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-53-15' 15 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-53-20.5' 20.5 7/13/2010 0.0358 <0.040 0.058 <0.040 0.11 0.15 0.13 0.049 0.045 <0.040 0.059 <0.040 0.10 <0.040 <0.040 <0.040 <0.040 <0.040 <0.040SB-53-25' 25 7/13/2010 0.0175 U 0.12 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-54-1' 1 7/12/2010 0.0188 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.038 0.023SB-54-3' 3 7/12/2010 0.07899 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.058 <0.020 0.10 0.10 0.024 0.049 0.050 0.037 0.053 <0.020 0.17 0.11SB-54-6' 6 7/12/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-54-9' 9 7/12/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-54-15' 15 7/12/2010 0.0758 <0.040 0.061 <0.040 <0.040 0.26 0.23 0.31 0.077 0.12 0.14 <0.040 0.19 0.066 <0.040 0.051 <0.040 0.087 0.055SB-54-20' 20 7/12/2010 0.037 <0.040 0.10 <0.040 <0.040 0.35 0.88 <0.040 0.10 0.061 0.084 <0.040 0.22 <0.040 <0.040 <0.040 <0.040 <0.040 <0.040

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TABLE A-5




SB-54-22' 22 7/12/2010 0.0845 0.21 0.56 0.60 <0.040 0.23 0.072 0.74 0.095 0.087 0.096 <0.040 0.17 <0.040 <0.040 0.068 <0.040 <0.040 <0.040

SB-55-1.5' 1.5 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.021 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.024 <0.020SB-55-3' 3 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-55-6' 6 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-55-9' 9 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-55-15' 15 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-55-20' 20 7/13/2010 0.0373 <0.040 0.28 <0.040 <0.040 0.45 0.85 0.20 0.16 0.10 0.10 <0.040 0.25 <0.040 <0.040 <0.040 <0.040 <0.040 <0.040SB-55-25' 25 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-56-0.5' 0.5 7/14/2010 36.34 <4.0 <4.0 <4.0 6.2 <4.0 <4.0 39 <4.0 69 63 15 26 25 22 26 <4.0 43 32SB-56-3' 3 7/14/2010 0.27258 0.058 <0.020 <0.020 0.043 <0.020 <0.020 0.22 <0.020 0.58 0.71 0.12 0.23 0.23 0.17 0.17 0.042 0.47 0.34SB-56-6' 6 7/14/2010 0.05551 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.038 <0.020 0.11 0.14 0.023 0.041 0.045 0.030 0.035 <0.020 0.099 0.069SB-56-9' 9 7/14/2010 0.0198 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.021 <0.020 0.048 0.061 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.052 0.033SB-56-15' 15 7/14/2010 0.03653 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.025 <0.020 0.058 0.076 <0.020 0.023 0.026 0.021 0.023 <0.020 0.067 0.042

SB-56-20.5' 20.5 7/14/2010 0.882 <1.0 <1.0 <1.0 <1.0 1.4 1.5 1.8 <1.0 <1.0 <1.0 <1.0 1.2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0SB-56-25' 25 7/14/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-57-20.5' 20.5 7/15/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-58-0 0 9/22/2010 0.07252 <0.020 <0.020 0.021 <0.020 <0.020 <0.020 0.020 <0.020 <0.020 0.025 0.046 0.052 0.046 0.052 0.052 <0.020 0.024 0.022SB-58-5 5 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-58-10 10 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-59-3 3 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.025 0.027 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-59-5 5 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.041 0.075 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-59-10 10 9/22/2010 0.08259 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.041 <0.020 0.085 0.22 0.052 0.069 0.069 0.059 0.056 <0.020 0.076 0.045SB-60-0 0 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-60-5 5 9/22/2010 0.01772 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.027 <0.020 0.026 0.030 <0.020 0.032 <0.020 <0.020 <0.020 <0.020 0.020 <0.020

SB-60-10 10 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-61-0 0 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-61-5 5 9/22/2010 0.01762 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.026 0.025 <0.020 0.022 <0.020 <0.020 <0.020 <0.020 0.021 <0.020

SB-61-10 10 9/22/2010 0.01765 <0.020 <0.020 <0.020 <0.020 <0.020 0.038 <0.020 <0.020 <0.020 0.15 <0.020 0.025 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-62-0 0 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.024 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-62-5 5 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-62-10 10 9/22/2010 0.01881 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.025 <0.020 0.036 0.034 <0.020 0.031 0.021 <0.020 <0.020 <0.020 0.031 <0.020SB-62-15 15 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-63-1 1 9/23/2010 0.0175 U 0.20 <0.020 <0.020 0.11 0.12 0.059 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-63-5 5 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-63-10 10 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-63-15 15 9/23/2010 0.02053 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.036 0.037 <0.020 0.033 0.027 0.021 <0.020 <0.020 0.023 <0.020

SB-64-1 1 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-64-5 5 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-64-10 10 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-64-15 15 9/22/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-65-1 1 9/23/2010 0.03804 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.031 <0.020 0.047 0.046 0.022 0.034 0.031 <0.020 0.027 <0.020 0.029 <0.020SB-65-5 5 9/23/2010 0.03645 0.062 <0.020 <0.020 0.036 0.039 0.021 0.024 <0.020 0.041 0.048 <0.020 0.035 0.031 0.024 0.024 <0.020 0.036 0.022

SB-65-10 10 9/23/2010 0.22148 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.10 <0.020 0.27 0.22 0.086 0.19 0.20 0.12 0.15 0.047 0.17 0.13SB-65-15 15 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-66-0 0 9/23/2010 0.0175 U 0.19 <0.020 <0.020 0.098 0.11 0.048 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-66-5 5 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-66-10 10 9/23/2010 0.05114 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.027 <0.020 0.048 0.045 0.028 0.044 0.041 <0.020 0.037 <0.020 0.036 0.024

6 of 8

BaP

Equ

ival

ent

Nap

htha

lene

1-M

ethy

lnap

htha

lene

2-M

ethy

lnap

htha

lene

Ace

naph

thyl

ene

Ace

naph

then

e

Fluo

rene

Phe

nant

hren

e

Ant

hrac

ene

Fluo

rant

hene

Pyr

ene

Ben

zo(a

)ant

hrac

ene

*

Chr

ysen

e *

Ben

zo(b

)fluo

rant

hene

*

Ben

zo(k

)fluo

rant

hene

*

Ben

zo(a

)pyr

ene*

Dib

enz(

a,h)

Ant

hrac

ene

*

Ben

zo(g

,h,i)

Per

ylen

e

Inde

no(1

,2,3

-cd)

pyre

ne*


TABLE A-5




SB-67-0 0 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.022 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-67-5 5 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-67-10 10 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-68-0 0 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-68-5 5 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-68-10 10 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-69-0 0 9/23/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.022 <0.020 0.029 0.027 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020SB-69-5 5 9/23/2010 0.0175 U 0.039 <0.020 <0.020 0.050 0.063 0.036 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

SB-69-10 10 9/23/2010 0.04913 0.035 <0.020 0.021 <0.020 0.023 0.031 0.042 0.024 0.031 0.036 0.028 0.033 0.027 0.029 0.029 0.025 0.032 0.029TP-1-0.5' 0.5 7/12/2010 0.16558 <0.020 <0.020 <0.020 0.026 <0.020 <0.020 0.12 <0.020 0.26 0.33 0.054 0.098 0.13 0.078 0.12 <0.020 0.22 0.15TP-1-3' 3 7/12/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.023 0.032 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.020 <0.020TP-1-6' 6 7/12/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

TP-2-0.5' 0.5 7/12/2010 1.3059 <0.20 <0.20 <0.20 0.25 <0.20 <0.20 0.73 <0.20 1.4 1.7 0.38 0.69 0.86 0.61 0.95 <0.20 2.2 1.3TP-2-3' 3 7/12/2010 0.16315 <0.020 <0.020 <0.020 0.024 <0.020 <0.020 0.065 <0.020 0.18 0.23 0.048 0.085 0.12 0.071 0.12 <0.020 0.23 0.15TP-2-6' 6 7/12/2010 6.777 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 7.6 <1.0 16 20 2.3 3.7 4.0 2.7 5.1 <1.0 9.9 5.7

TP-2-9' A 9 7/12/2010 0.0194 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.028 0.035 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.048 0.029TP-3-0.5' 0.5 7/12/2010 27.616 <2.0 <2.0 <2.0 5.4 <2.0 <2.0 21 <2.0 44 46 10 19 24 19 18 3.9 40 28TP-3-3' 3 7/12/2010 0.8562 <0.10 <0.10 <0.10 0.11 <0.10 <0.10 0.49 <0.10 1.3 1.4 0.33 0.64 0.76 0.57 0.55 0.12 1.3 0.93TP-3-6' 6 7/12/2010 0.8916 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.69 <0.10 1.4 1.5 0.37 0.64 0.72 0.62 0.58 0.13 1.3 0.90

TP-4-0.5' 0.5 7/12/2010 0.0388 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.039 0.055 <0.020 0.020 0.023 <0.020 0.028 <0.020 0.043 0.029TP-4-3' 3 7/12/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020TP-4-6' 6 7/12/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

TP-5-0.5' 0.5 7/13/2010 0.05599 0.045 <0.020 <0.020 <0.020 <0.020 <0.020 0.036 <0.020 0.076 0.098 <0.020 0.029 0.039 0.020 0.040 <0.020 0.090 0.054TP-5-3' 3 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020TP-5-6' 6 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

TP-6-0.5' 0.5 7/13/2010 2.778 <0.40 <0.40 <0.40 <0.40 <0.40 <0.40 2.5 <0.40 4.3 4.8 0.86 1.4 1.5 1.3 2.1 <0.40 3.6 2.3TP-6-3' 3 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020TP-6-6' 6 7/13/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.022 0.027 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.025 <0.020

TP-7-25S 1.17 7/12/2010 2.76 <0.40 <0.40 <0.40 0.57 <0.40 <0.40 2.4 <0.40 3.7 4.3 0.80 1.2 1.5 1.1 2.1 <0.40 4.3 2.4TP-7-25D 2.67 7/12/2010 1.5662 0.28 <0.20 <0.20 0.25 <0.20 <0.20 1.2 <0.20 2.1 2.7 0.39 0.62 0.86 0.61 1.2 <0.20 2.5 1.4TP-7-40S 1.17 7/12/2010 0.33902 0.038 <0.020 <0.020 0.047 <0.020 <0.020 0.31 0.036 0.48 0.54 0.12 0.18 0.20 0.13 0.26 0.033 0.29 0.21TP-7-40D 2.67 7/12/2010 0.0214 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.031 0.038 <0.020 <0.020 0.029 <0.020 <0.020 <0.020 0.046 0.030TP-8-0.5' 0.5 7/13/2010 45.532 3.8 <2.0 <2.0 2.9 <2.0 <2.0 18 2.7 45 50 14 20 23 18 35 4.8 48 32TP-8-3' 3 7/13/2010 0.5217 0.031 <0.020 <0.020 0.046 <0.020 <0.020 0.19 0.027 0.61 0.73 0.20 0.30 0.31 0.25 0.39 0.055 0.47 0.34TP-8-6' 6 7/13/2010 0.13354 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.031 <0.020 0.10 0.14 0.042 0.064 0.087 0.066 0.10 <0.020 0.14 0.10

TP-9-0.5' 0.5 7/13/2010 54.226 <2.0 <2.0 <2.0 2.4 <2.0 <2.0 8.4 <2.0 44 54 13 19 27 21 42 5.4 67 41TP-9-3' 3 7/13/2010 3.205 <0.40 <0.40 <0.40 0.41 <0.40 <0.40 2.1 <0.40 4.0 5.0 0.76 1.1 1.7 1.2 2.5 <0.40 4.2 2.6TP-9-6' 6 7/13/2010 0.6713 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.18 <0.10 0.72 0.89 0.24 0.33 0.32 0.29 0.52 <0.10 0.71 0.46

TP-9-9' A 9 7/13/2010 0.79 0.34 <0.10 <0.10 0.13 <0.10 <0.10 0.66 <0.10 1.2 1.6 0.20 0.30 0.38 0.27 0.63 <0.10 0.93 0.55TP-10-0.5' 0.5 7/13/2010 0.2233 0.029 <0.020 <0.020 0.054 <0.020 <0.020 0.24 <0.020 0.40 0.49 0.076 0.12 0.13 0.087 0.17 0.020 0.23 0.16TP-10-3' 3 7/13/2010 1.6857 <0.20 <0.20 <0.20 0.21 <0.20 <0.20 0.50 <0.20 1.9 2.3 0.42 0.67 0.94 0.59 1.3 <0.20 2.5 1.5TP-10-6' 6 7/13/2010 0.15649 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.037 <0.020 0.19 0.25 0.038 0.059 0.090 0.057 0.12 <0.020 0.23 0.14

TP-11-0.5' 0.5 7/13/2010 89.456 5.8 <4.0 <4.0 <4.0 <4.0 <4.0 22 <4.0 80 95 30 46 47 42 68 9.4 84 59TP-11-3' 3 7/13/2010 31.31 1.2 <1.0 <1.0 2.5 <1.0 <1.0 4.1 <1.0 23 30 6.8 11 17 12 24 3.0 45 26TP-11-6' 6 7/13/2010 1.9426 <0.20 <0.20 <0.20 0.43 <0.20 <0.20 0.78 <0.20 2.0 2.4 0.55 0.86 1.1 0.85 1.5 <0.20 2.4 1.5

TP-11-9' A 9 7/13/2010 4.8578 1.5 <0.40 <0.40 1.7 <0.40 0.41 8.5 0.56 8.1 8.8 2.0 2.8 2.5 2.3 3.7 0.47 4.1 2.9AK-1-30" 2.5 7/15/2010 0.29454 <0.020 <0.020 <0.020 0.040 <0.020 <0.020 0.081 <0.020 0.28 0.32 0.078 0.15 0.19 0.18 0.20 0.036 0.57 0.36

7 of 8

BaP

Equ

ival

ent

Nap

htha

lene

1-M

ethy

lnap

htha

lene

2-M

ethy

lnap

htha

lene

Ace

naph

thyl

ene

Ace

naph

then

e

Fluo

rene

Phe

nant

hren

e

Ant

hrac

ene

Fluo

rant

hene

Pyr

ene

Ben

zo(a

)ant

hrac

ene

*

Chr

ysen

e *

Ben

zo(b

)fluo

rant

hene

*

Ben

zo(k

)fluo

rant

hene

*

Ben

zo(a

)pyr

ene*

Dib

enz(

a,h)

Ant

hrac

ene

*

Ben

zo(g

,h,i)

Per

ylen

e

Inde

no(1

,2,3

-cd)

pyre

ne*


TABLE A-5




AK-1-38" 3.17 7/15/2010 0.10127 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.026 <0.020 0.078 0.096 0.024 0.047 0.072 0.068 0.068 <0.020 0.23 0.13AK-2-20" 1.7 7/15/2010 0.0385 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 0.033 0.048 <0.020 0.020 0.025 <0.020 0.027 <0.020 0.060 0.034AK-2-34" 2.83 7/15/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020AK-3-17" 1.42 7/15/2010 0.0175 U <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020 <0.020

Table Notes:Bold values represent positive detections.U - Indicates carcinogenic PAHs were not detected at or above reporting limits, and the reported BaPe concentration was calculated using 1/2 the reporting limit for carcinogenic compounds.* - Denotes PAH compound included in calculation of BaP equivalent concentration.< - Indicates constituent not detected at concentrations equal to or greater than the specified reporting limit.-- Not analyzed.A - Sample extracted outside recommended holding time.

Abbreviations:PAHs - Polynuclear aromatic hydrocarbonsDUP - Indicates duplicate sample.EPA - Environmental Protection Agencymg/kg - Milligrams per kilogramBaPe: benzo(a)pyrene and equivalents (OEHHA, 1994)

8 of 8

EPA Method 7471ASb As Ba Be Cd Cr Co Cu Pb Mo Ni Se Ag Tl V Zn Hg

(mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L)GW-1 61 10/17/2008 <0.015 <0.01 0.2 <0.001 <0.005 <0.005 <0.005 <0.005 <0.01 0.0269 0.00621 <0.015 <0.005 <0.015 0.0134 0.0294 <0.0005GW-2 64 10/20/2008 <0.015 <0.01 0.261 <0.001 <0.005 <0.005 <0.005 <0.005 <0.01 0.0313 <0.005 <0.015 <0.005 <0.015 0.00818 0.208 <0.0005SB-18 65 11/4/2009 <0.0150 <0.0100 0.196² <0.0100 <0.0100 <0.0100 <0.0100 <0.0100 <0.0100 <0.0100 <0.0100 <0.0150 <0.00500 <0.0150 0.0163 0.0277 <0.000500SB-20 66.5 11/5/2009 <0.0150 <0.0100 0.151² <0.0100 <0.0100 <0.0100 <0.0100 <0.0100 <0.0100 <0.0100 <0.0100 <0.0150 <0.00500 <0.0150 0.0149 0.0172² <0.000500


Abbreviations:EPA - Environmental Protection Agency Sb - Antimony Be - Beryllium Co - Cobalt Mo - Molybdenum Si - Silver Z - Zincmg/L - Milligrams per liter As - Arsenic Cd - Cadmium Cu - Copper Ni - Nickel Tl - Thallium Hg - Mercury

Ba - Barium Cr - Chromium Pb - Lead Se - Selenium V - Vanadium

Table A-6Historical Groundwater Chemical Data - Metals

Pacific Gas and Electry Company Former Lodi Manufactured Gas Plant Site712 S. Sacramento Street, Lodi, California

Sample ID Depth (feet) Date

EPA Method 6010B


EPA Method 5030B/8015BTPH-g TPH-d TPH-mo(ug/L) (ug/L) (ug/L)

GW-1 61 10/17/2008 91 230 <250GW-2 64 10/20/2008 <50 140 J <250SB-18 65 11/4/2009 <50 <50 <250SB-20 66.5 11/5/2009 <50 <50 <250

Table Notes:Bold values represent positive detections.

J - Indicates estimated value higher than the method detection limit, but below the laboratory reporting limit.

Abbreviations:EPA - Environmental Protection Agencyug/L - Micrograms per literTPH-g - Total petroleum hydrocarbons as gasolineTPH-d - Total Petroleum Hydrocarbons as diesel (processed using silica gel cleanup)TPH-mo - Total Petroleum Hydrocarbons as motor oil (processed using silica gel cleanup)

Sample IDDepth (feet) Date


Table A-7Historical Groundwater Chemical Data - Petroleum Hydrocarbons



Benz

ene

Ethy

lben

zene

Tolu

ene

Xyle

ne (p

/m)

Xyle

ne (o

)

GW-1 61 10/17/2008 17 1.6 8.4 1.2 1.4GW-2 64 10/20/2008 <0.5 <1 <1 <1 <1SB-18 65 11/4/2009 <0.5 <1.0 <1.0 <1.0 <1.0SB-20 66.5 11/5/2009 <0.50 <1.0 <1.0 <1.0 <1.0

Table Notes:Bold values represent positive detections.

Abbreviations:EPA - Environmental Protection Agencyug/L - Micrograms per liter


Table A-8Historical Groundwater Chemical Data - BTEX


Sample IDDepth(feet) Date

EPA Method 5030B/8260B(ug/L)

1 of 1

EPA Method 9010C/9014Total Cyanide

(mg/L)GW-1 61 10/17/2008 <0.050GW-2 64 10/20/2008 <0.050SB-18 65 11/4/2009 <0.050SB-20 66.5 11/5/2009 <0.050


Abbreviations:EPA - Environmental Protection Agencymg/L - Milligrams per liter

Table A-9Historical Groundwater Chemical Data - Cyanide


Sample ID Depth (feet) Date


Nap

htha

lene

1-M

ethy

lnap

htha

lene

2-M

ethy

lmap

htha

lene

Acen

apht

hyle

ne

Acen

apth

ene

Fluo

rene

Phen

anth

rene

Anth

race

ne

Fluo

rant

hene

Pyre

ne

Benz

o(a)

anth

race

ne

Chr

ysen

e

Benz

o(b)

fluor

anth

ene

Benz

o(k)

fluor

anth

ene

Benz

o(a)

pyre

ne

Dib

enz(

a,h)

anth

race

ne

Benz

o(g,

h,i)P

eryl

ene

Inde

no(1

,2,3

-cd)

pyre

ne

GW-1 61 10/17/2008 1.7 <1.0 <1.0 <1.0 2 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <0.2 <1.0 <1.0 <1.0GW-2 64 10/20/2008 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <1.0 <0.2 <1.0 <1.0 <1.0SB-18 65 11/4/2009 0.40 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20SB-20 66.5 11/5/2009 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20 <0.20


Abbreviations:EPA - Environmental Protection Agencyug/L - Micrograms per literPAHs - Polynuclear aromatic hydrocarbons

Table A-10Historical Groundwater Chemical Data - PAHs


Sample IDDepth(feet) Date

PAHs(ug/L)

EPA METHOD 3545/8310

1 of 1

Modified ASTM D-1946

(%)

Ben

zene

Tolu

ene

Eth

ylbe

nzen

e

Tota

l Xyl

enes

Freo

n 12

Freo

n 11

Eth

anol

Ace

tone

Car

bon

Dis

ulfid

e

Met

hyl t

ert-b

utyl

eth

er

2-B

utan

one

(Met

hyl E

thyl

K

eton

e)

Hep

tane

Tric

hlor

oeth

ene

Tetra

chlo

roet

hene

2-H

exan

one

Sty

rene

Cum

ene

Pro

pylb

enze

ne

4-E

thyl

tolu

ene

1,3,

5-Tr

imet

hylb

enze

ne

1,2,

4-Tr

imet

hylb

enze

ne

1,1-

Difl

uoro

etha

ne

Nap

htha

lene

Hel

ium

SG-1S 5 7/15/2009 1.7 11 52 311 1.4 <1.6 3.2 68 <4.4 <1.0UJ 5.3 <1.2 <1.5 2.1 <5.8 <1.2 5.8 21 160 66 140 <3.8 <7.5 0.38SG-1D 8 7/15/2009 2.2 13 71 459 <2.1 <2.4 <4.0 78 <6.7 <1.5 3.9 <1.8 <2.3 3.9 <8.8 5.0 8.0 28 220 91 210 <5.8 <11 --SG-2S 5 7/14/2009 <12 3400 250 1340 <19 <21 <36 150 <59 <14UJ <11 <16 <20 <26 <78 <16 19 <19 70 41 120 <52 <100 --SG-2D 8 7/14/2009 <34 8000 690 3490 <53 <60 <81 260 <33 <38 <32 <44 <58 <72 <180 <46 <52 <53 91 69 160 <120 <220 --SG-3S 5 7/14/2009 <3.0 120 28 188 <4.6 <5.2 <8.8 71 <14 <3.4UJ <2.8 <3.8 <5.0 <6.3 <19 <4.0 10 31 210 60 170 <13 <24 --

DUP-1 (SG-3S) 5 7/14/2009 1.4 120 30 200 1.0 1.3 <1.6 85 <2.7 <0.63UJ 3.2 1.0 2.1 3.5 <3.6 <0.74 11 32 210 60 180 <2.4 23 --SG-3D 8 7/15/2009 1.3 36 23 134 <0.97 1.4 <1.8 18 <3.0 <0.71UJ 2.6 1.7 <1.0 9.0 4.2 <0.83 10 48 310 88 240 <2.6 15 --SG-4S 5 7/14/2009 4.6 6.9 40 252 <1.5 1.8 <2.9 82 34 <1.1UJ 4.0 <1.2 6.2 2.6 <6.2 <1.3 22 12 83 29 59 <4.1 <8.0 --SG-4D 8 7/14/2009 7.5 9.9 42 250 <8.2 <9.4 <16 210 <26 <6.0UJ 7.8 <6.8 <9.0 <11 <34 <7.1 27 10 72 26 45 <22 <44 --SG-5S 5 7/16/2009 <2.7 36 3.7 26.3 <4.2 <4.7 <7.9 180 <13 <3.0 4.4 <3.4 <4.5 <5.7 <17 <3.6 5.6 9.6 66 26 66 <11 <22 --SG-5D 8 7/16/2009 <2.8 51 <3.9 19.8 <4.4 <5.0 16 250 <14 <3.2 8.1 <3.7 <4.8 <6.1 <18 <3.8 <4.4 16 110 50 120 5.1J <23 <0SG-6S 5 7/16/2009 <2.8 570 37 182 <4.3 <4.9 <8.2 28 <14 <3.2 4.0 7.6 <4.7 <5.9 <18 <3.7 <4.3 <4.3 7.8 <4.3 11 <12 <23 --

DUP-2 (SG-6S) 5 7/16/2009 <2.7 480 33 171 <4.2 <4.8 <8.0 26 <13 <3.1 3.9 6.8 <4.6 <5.8 <18 <3.6 <4.2 <4.2 8.0 <4.2 11 <12 <22 --SG-6S (LAB DUP) -- -- <5.6 560 32 158 <8.6 <9.8 <16 30 <27 <6.3 <5.2 7.5 <9.4 <12 <36 <7.4 <8.6 <8.6 <8.6 <8.6 11 <24 <46 --

SG-6D 8 7/16/2009 <5.4 1000 69 340 <8.3 <9.4 <16 60 <26 <6.0 6.9 13 <9.0 <11 <34 <7.2 <8.2 <8.2 12 <8.2 16 <23 <44 --EB-1 -- 7/16/2009 <3.0 3.6 <4.1 <4.1 <4.7 <5.4 <9.0 300 <15 <3.4 4.2 <3.9 <5.1 <6.5 <20 <4.1 <4.7 <4.7 <4.7 <4.7 <4.7 <13 <25 --

Table Notes:Bold value denotes values that exceed the method detection or reporting limit.Only analytes detected above the method reporting limit are shown.µg/m3 - micrograms per cubic meter% - percent< - Indicates constituent not detected at concentration equal to or greater than the specified reporting limit.J - Estimated value; concentration is above the method detection limit, but below the method reporting limit.UJ - Non-detected compound associated with low bias in the continuing calibration verification (CCV).

Abbreviations:bgs - below ground surface

TABLE A-11Historical Soil Vapor Chemical Data


Sample NameSample Depth

(feet bgs) Sample Date

Method Modified TO-15 Low Level

(µg/m3)

1 of 1


APPENDIX B Applicable or Relevant and Appropriate Requirements

Human Health Risk Assessment / Feasibility Study / Removal Action Workplan

Former Lodi Manufactured Gas Plant PN: 185702232

July 11, 2012


Potential Chemical-Specific Requirements

The following requirements may be considered chemical-specific requirements for the cleanup:

Title 22, California Code of Regulations, Chapter 11, Article 3 (Characteristics of Hazardous Waste). If a generator determines that a substance is a waste, the waste must be handled as a hazardous waste, if it meets the criteria specified in this article. This ARAR is relevant to the site remediation, if materials are removed and hauled from the site and the materials are classified as California hazardous waste.

Title 22, California Code of Regulations, Section 66268.1, Land Disposal Restrictions. These restrictions identify hazardous wastes that are prohibited from land disposal (i.e., ‘land ban’). This ARAR is relevant to the site remediation, if materials are removed and hauled from the site and the materials are classified as California hazardous waste.

Title 22, California Code of Regulations, Section 66699, Land Disposal Criteria for California Hazardous Waste (i.e., Persistent and Bioaccumulative Toxic Waste). Total threshold limit concentrations (TTLC) and soluble threshold limit concentration (STLC) criteria are intended to determine the type of landfill that a waste material must be sent to (i.e., criteria to determine if a material is classified as California hazardous waste). Where TTLC or STLC criteria are exceeded, the waste must in general be sent to a Class I, hazardous waste landfill, unless specific exemptions apply. This ARAR is relevant to the site remediation if materials are removed and hauled from the site and the materials are classified as California hazardous waste.

Potential Action-Specific Requirements

The following federal and state requirements may be considered action-specific requirements for the site cleanup.

Air Emissions Standards. Regulations issued by the San Joaquin Valley Air Pollution Control District may apply to remedial actions that could involve the release of vapors and/or particulates. In particular, soil excavation or grading may be a source of fugitive dust emissions and vapor release. District regulations that may be applicable include:

Regulation VIII, Rules 8021, 8031, and 8041 – Controlling fugitive dust emissions during construction, excavation, and related activities including handling and storage of bulk materials and carryout/trackout of materials from the site.

Title 22, Section 67391.1, California Code of Regulations – Land Use Covenants. These regulations require land use covenants to be included as part of a remedial


action plan when levels of hazardous substances will remain which do not allow for unrestricted use and deed restrictions are included as part of the remedy.

Hazardous Waste Generator and Treatment, Storage, and Disposal Facility Requirements. Off-site disposal may produce hazardous wastes that require special management in accordance with the State of California’s hazardous waste management program (California Code of Regulations, Title 22, Section 66262.10). These requirements could be triggered because excavated soils in select areas may contain constituents that exceed federal or state hazardous waste regulatory threshold concentrations. Federal and state regulations related to the generation, treatment, storage, or disposal of hazardous waste are ARARs for the site.

California Health and Safety Code, Section 25123.3(b)(4)(B). A generator that accumulates hazardous waste generated and held on-site for 90 days or less for the purposes of off-site transportation does not require a storage facility permit if specific requirements are met. This statute will be triggered if soils are excavated, stockpiled, and then transported off-site for disposal.

Porter Cologne Water Quality Control Act. This Act requires provisions to protect ground and surface water during the proposed remedial activities. The Act requires development of a Storm Water Pollution Prevention Plan (SWPPP) and filing of a Notice of Intent (NOI) with the State Water Resources Control Board (SWRCB) for storm water control, depending in part upon the size of the area of disturbance during the cleanup.

Potential Location-Specific Requirements

The following requirements may be considered location-specific requirements for the site cleanup.

National Archaeological and Historic Preservation Act. These regulations (36 CFR Part 65) provide for the protection of any historically significant artifacts that may be unearthed during excavation activities. No such artifacts have been found during investigation activities conducted at the site to date. Appropriate actions will be taken if historically significant artifacts are unearthed during excavation.

Endangered Species Act. The Endangered Species Act of 1973 (16 United States Code, Part 1451) and comparable California endangered species regulations require that actions do not further endanger listed species or their habitats. There are no known or suspected endangered species or critical habitat areas present at the site.

Additional Potential Requirements

The following are additional potential requirements that may apply to the site cleanup


California Human Health Screening Level (CHHSLs) for Use in Evaluation of Contaminated Properties, January 2005. CHHSLs are screening levels for selected hazardous chemicals in soil to assess potential human health risk associated with direct exposure to soil (including inhalation of particles) and inhalation of volatile vapors. The screening levels are similar to the USEPA Region 9 PRGs with California-specific toxicity factors. These values can be used as conservative cleanup goals for contaminants in soil in the absence of site-specific risk analysis. The values are conservative if there are no additional exposure pathways (i.e., not already incorporated into the CHHSL) and as long as there are not multiple contaminants.


APPENDIX C Administrative Record List



July 11, 2012


Administrative Record PG&E Former Lodi MGP Site

712 South Sacramento Street, Lodi, California Human Health Risk Assessment / Feasibility Study / Remedial Action Workplan

This Administrative Record is provided in accordance with Subpart I of the National Contingency Plan to identify documents that were relied upon or considered when approving the subject remedial action. California Environmental Protection Agency (Cal/EPA), 1994. Preliminary Endangerment

Assessment Guidance Manual. Department of Toxic Substances Control (DTSC). January.

California Environmental Protection Agency (Cal/EPA), 2009. Interim Guidance Evaluating

Human Health Risks from Total Petroleum Hydrocarbons (TPH). Department of Toxic Substances Control, Human and Ecological Risk Division (DTSC-HERD). June 16.

City of Lodi. 2006. Reynolds Ranch Draft Environmental Impact Report. City of Lodi Water Pollution Control Facility. 2006. Groundwater Investigation Existing

Conditions Report. October. Department of Toxic Substances Control (DTSC), 2001. Information Advisory – Clean Imported

Fill Material. October.

Department of Toxic Substances Control (DTSC), 2001. Guidance for Developing Transportation Plans for Removal or Remedial Actions (Interim Final). December 5.

Department of Toxic Substances Control (DTSC), 2003. Advisory – Active Soil Gas Investigations. January 28.

Department of Toxic Substances Control (DTSC), 2005. Use of California Human Health

Screening Levels (CHHSLs) in Evaluation of Contaminated Properties. January. Department of Toxic Substances Control (DTSC), 2009. Use of Northern and Southern California

Polynuclear Aromatic Hydrocarbon (PAH) Studies in Manufactured Gas Plant Site Cleanup Process. July 1.

Department of Toxic Substances Control (DTSC), 2009. Letter approving Well Abandonment

Work Plan. June 10.


Department of Toxic Substances Control (DTSC), 2009. Letter approving Additional On-site and Off-site Investigation Work Plan. October 26.

Department of Toxic Substances Control (DTSC), 2009b. Letter approving Revised Off-site Soil

Investigation Work Plan. October 15. Department of Toxic Substances Control (DTSC), 2009c. Arsenic Strategies – Determination of Arsenic

Remediation – Development of Arsenic Cleanup Goals. January 16. Garcia and Associates (GANDA). Final Historical Resources Evaluation Report for the Pacific Gas and

Electric Lodi Former Manufactured Gas Plant General Shop and Store Room/Meter House Building, Lodi, San Joaquin County, California. September 2007.

Iris Environmental, 2010. Memorandum: Follow Up from September 29th, 2010 Health Risk Assessment

Scoping Meeting: PG&E Former Lodi Manufactured Gas Plant Site. November 11. Iris Environmental, 2011. Draft Human Health Risk Assessment, Former Lodi Manufactured Gas Plant,

712 South Sacramento Street, Lodi, California. March. San Francisco Bay Regional Water Quality Control Board, 2008. Screening for Environmental Concerns

at Sites with Contaminated Soil and Groundwater. Interim Final, May. Stantec, 2008. Remedial Investigation Work Plan. August 7. Stantec, 2009. Active Soil Gas Sampling Work Plan. January 21. Stantec, 2009. Semi-Permanent Soil Vapor Probe Installation and Soil Vapor Sampling Procedures Work

Plan. July 1. Stantec, 2009. Well Abandonment Work Plan. February 3. Stantec, 2009. Well Destruction Report. August 13. Stantec, 2009. Additional On-site and Off-site Investigation Work Plan. September 28. Stantec, 2009. Revised Off-site Soil Investigation Work Plan. October 8. Stantec, 2009. Response to Comments – DTSC Review of Off-site Soil Investigation Work Plan.

October 1. Treadwell & Rolo. Report of Third Quarter 2007 Groundwater Monitoring. January 8, 2008. United States Environmental Protection Agency (USEPA), 1973. Processes, Procedures and Methods to

Control Pollution Resulting From All Construction Activity. 430/9-73-007.


United States Environmental Protection Agency (USEPA), 2000. Test Methods for Evaluating Solid Waste, Physical/Chemical Methods (SW 846). November.

United States Environmental Protection Agency, 2009. Regional Screening Levels. December.


APPENDIX D Human Health Risk Assessment (Iris Environmental) –

submitted electronically (refer to CD) Human Health Risk Assessment / Feasibility Study / Removal Action


PN: 185702232 July 11, 2012

FINAL

HUMAN HEALTH RISK ASSESSMENT FORMER LODI MANUFACTURED GAS PLANT

712 SOUTH SACRAMENTO STREET LODI, CALIFORNIA

Prepared for:

Pacific Gas and Electric Company San Francisco, California

Prepared by:

IRIS ENVIRONMENTAL 1438 Webster Street, Suite 302

Oakland, California 94612 (510) 834-4747

June 2011 Project No. 10-718-A

FINAL Human Health Risk Assessment June 2011 Former Lodi Manufactured Gas Plant Site

i IRIS ENVIRONMENTAL

TABLE OF CONTENTS Page EXECUTIVE SUMMARY .......................................................................................................ES-1 1.0 INTRODUCTION AND OBJECTIVES ......................................................................... 1-1 2.0 SITE DESCRIPTION AND SUMMARY OF SITE INVESTIGATIONS ..................... 2-1

2.1 Site Description .................................................................................................... 2-1 2.2 Summary of Site Investigations ........................................................................... 2-2 2.3 Summary of Nature and Extent of Impacts .......................................................... 2-4

3.0 DATA EVALUATION AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN ...................................................................................................................... 3-1 3.1 Data Evaluation .................................................................................................... 3-1 3.2 Selection of Chemicals of Potential Concern ...................................................... 3-1

4.0 EXPOSURE ASSESSMENT .......................................................................................... 4-1 4.1 Chemical Sources and Potential Release Mechanisms ........................................ 4-1 4.2 Identification of Potentially Exposed Populations ............................................... 4-1 4.3 Exposure Pathways .............................................................................................. 4-2

4.3.1 Complete Exposure Pathways.................................................................. 4-2 4.3.2 Incomplete Exposure Pathways ............................................................... 4-3

4.4 Human Intake Assumptions ................................................................................. 4-3 4.5 Estimation of Representative Exposure Concentrations ...................................... 4-3

4.5.1 Estimation of COPC Concentrations in Soil ............................................ 4-4 4.5.2 Estimation of Air Concentrations Resulting from Emissions from Soil.. 4-5

5.0 TOXICITY ASSESSMENT ............................................................................................ 5-1 5.1 Toxicity Assessment for Carcinogenic Effects .................................................... 5-1 5.2 Toxicity Assessment for Noncarcinogenic Effects .............................................. 5-2 5.3 Toxicity Assessment for Lead ............................................................................. 5-3

6.0 RISK CHARACTERIZATION ....................................................................................... 6-1 6.1 Methodology ...................................................................................................... 6-1

6.1.1 Carcinogenic Health Effects .................................................................... 6-2 6.1.2 Noncarcinogenic Health Effects .............................................................. 6-3

6.2 Results of Cancer Risk and Noncancer Hazard Assessment ............................... 6-5 6.2.1 Current Land-Use Scenario ...................................................................... 6-5 6.2.2 Future Land-Use Scenario ....................................................................... 6-7 6.2.3 Uncertainties in Risk Characterization .................................................... 6-9

6.3 Summary and Conclusions .................................................................................. 6-9 7.0 REMEDIAL ACTION GOALS ...................................................................................... 7-1

7.1 Overview of the Remedial Action Goals ............................................................. 7-1 7.2 Derivation of Risk-Based Screening Concentrations for Soil ............................. 7-2

7.2.1 Methodology ............................................................................................ 7-2 7.3 Derivation of Ambient Based Screening Concentrations for Soil ....................... 7-5 7.4 Results: Comparison of Soil RBSCs and ABSCs to Detected Concentrations .. 7-6 7.5 Demonstrating Attainment of the Remedial Action Goal: Post Remediation Risk

Assessment ............................................................................................... 7-6 8.0 REFERENCES ................................................................................................................ 8-1


ii IRIS ENVIRONMENTAL

LIST OF TABLES Table 1 Summary of Chemicals Included in the Risk Assessment: Exposed Soils (0-1.5

feet bgs) Table 2 Summary of Chemicals Included in the Risk Assessment: Soils (0-10 feet bgs) Table 3 Summary of Chemicals Included in the Risk Assessment: Soil Gas Table 4 Exposure Parameters Table 5 Equations Used to Calculate Exposure Concentrations and Chronic Daily Intakes:

Residential Scenario Table 6 Equations Used to Calculate Exposure Concentrations and Chronic Daily Intakes:

Commercial Worker Scenario Table 7 Exposure Point and Predicted Outdoor Air Concentrations for Chemicals of

Potential Concern in Exposed Soils: Current Off-site Residential and Commercial Scenarios

Table 8 Exposure Point and Predicted Outdoor Air Concentrations for Chemicals of Potential Concern in Soils: Future On-site Residential Scenario

Table 9 Chemical Properties of the Chemicals of Potential Concern Table 10 Carcinogenic and Noncarcinogenic Toxicity Values for Chemicals of Potential

Concern Table 11 Exposure Concentration and Chronic Daily Intake for Carcinogens in Exposed

Soils: Current Off-site Residential and Commercial Scenarios Table 12 Exposure Concentration and Chronic Daily Intake for Noncarcinogens in Exposed

Soils: Current Off-site Residential and Commercial Scenarios Table 13 Exposure Concentration and Chronic Daily Intake for Carcinogens in Soils:

Future On-site Residential Scenario Table 14 Exposure Concentration and Chronic Daily Intake for Noncarcinogens in Soils:

Future On-site Residential Scenario Table 15 Cancer Risks from Exposed Soils: Current Off-site Residential and Commercial

Scenarios Table 16 Noncancer Hazard Indices from Exposed Soils: Current Off-site Residential and

Commercial Scenarios Table 17 Lead Risk Evaluation: Current Off-site Residential Scenario Table 18 Cancer Risks from Soils: Future On-site Residential Scenario Table 19 Noncancer Hazard Indices from Soils: Future On-site Residential Scenario Table 20 Lead Risk Evaluation: Future On-site Residential Scenario Table 21 Outdoor Air Inhalation Cancer Risks and Noncancer Hazard Indices for VOCs in

Soil Gas: Current Off-site and Future On-site Residential Scenarios Table 22 Outdoor Air Inhalation Cancer Risks and Noncancer Hazard Indices for VOCs in

Soil Gas: Current Off-site Commercial Scenario Table 23 Vapor Intrusion Cancer Risks and Noncancer Hazard Indices for VOCs in Soil

Gas: Future On-site Residential Scenario Table 24 Soil Risk-Based or Ambient-Based Screening Concentrations: Future On-site

Residential Scenario Table 25 Summary Statistics for Ambient CPAH Data Table 26 Summary of Samples with Chemicals Above Risk-Based or Ambient-Based

Screening Concentrations


iii IRIS ENVIRONMENTAL

LIST OF FIGURES Figure 1 Site Vicinity Map Figure 2 Site Plan Showing Sample Locations Figure 3 Conceptual Site Model LIST OF ATTACHMENTS Attachment A Site Investigation Data Included in the HRA Attachment B Determination of Ambient Arsenic Concentrations Attachment C Data Statistical Evaluation Attachment D Modeling Methodologies Attachment E Uncertainties in the Risk Assessment Attachment F Sample RBSC Calculation for Naphthalene


iv IRIS ENVIRONMENTAL

LIST OF ACRONYMS ABSC ambient-based screening concentration

B(a)P benzo(a)pyrene

bgs below ground surface

BTEX Benzene, Toluene, Ethylbenzene, and Xylenes

Cal/EPA California Environmental Protection Agency

CDI chronic daily intake

CHHSL California Human Health Screening Level

COPC chemical of potential concern

CPAH carcinogenic polycyclic aromatic hydrocarbons

CSF cancer slope factor

CSM conceptual site model

DTSC Department of Toxic Substances Control

EC exposure concentration

EPC exposure point concentration

FS Feasibility Study

HEAST Health Effects Assessment Summary Tables

HERD Human and Ecologic Risk Division

HERO Office of Human and Ecological Risk

HRA human health risk assessment

HI hazard index

HQ hazard quotient

IRIS USEPA’s Integrated Risk Information System

LIW Lodi Iron Works

MGP manufactured gas plant

µg/m3 micrograms per cubic meter

µg/dL micrograms per deciliter

mg/kg milligrams per kilogram

mg/kg/day milligram of chemical per kilogram body weight per day

mg/m3 milligrams per cubic meter

mg/L milligrams per liter

NCEA National Center of Environmental Assessment


v IRIS ENVIRONMENTAL

NCP National Contingency Plan

ND non-detect

NOEL No observed effects level

OEHHA Cal/EPA Office of Environmental Health Hazard Assessment

PAH polynuclear/polycyclic aromatic hydrocarbon

PEA Preliminary Endangerment Assessment

PEF particulate emission factor

PG&E Pacific Gas and Electric Company

PRG preliminary remediation goal

RAW Removal Action Workplan

RBSC risk-based screening concentration

REL reference exposure limit

RfD/RfC reference dose/reference concentration

RI Remedial Investigation

RL reporting limit

STSC Superfund Health Risk Technical Support Center

TF transfer factor

TPH total petroleum hydrocarbons

TRW ALM USEPA Technical Review Workgroup Adult Lead Methodology

UCL upper confidence limit

URF unit risk factor

USEPA United States Environmental Protection Agency

UTL upper tolerance limit

VF volatilization factor

VOC volatile organic compound


ES-1 IRIS ENVIRONMENTAL

EXECUTIVE SUMMARY Iris Environmental prepared this human health risk assessment (HRA) on behalf of Pacific Gas and Electric Company (PG&E) for the Former Lodi Manufactured Gas Plant (MGP) Site (the “Site”). The Site was formerly a crude oil manufactured gas plant, which was previously operated and is currently owned by PG&E. The 0.73-acre Site is currently vacant and fenced. Objectives of the HRA The primary purpose of this HRA, as presented and further outlined in a memorandum submitted to the Department of Toxic Substances Control (DTSC) (Iris Environmental, 2010), is to evaluate potential risks to current and/or future populations that could be exposed to Site-related chemicals at the former Lodi MGP Site. As the Site is currently vacant and fenced, the scope of the HRA focuses primarily on evaluations associated with the potential future unrestricted use of the Site for hypothetical residential purposes. The results of the HRA will be used to identify areas of the Site where remediation, or other forms of risk management, may be appropriate, with the overall goal of long-term protection of human health and the environment. Site Investigations Site investigation conducted at the Site included the following:

• Mid-1980s: One surface soil sample was collected at the Site by PG&E in the mid-1980s. The location of this historical sample is unknown. The soil sample was analyzed for polycyclic aromatic hydrocarbons (PAHs), arsenic, lead, mercury, and cyanide.

• 2006: In February 2006, nine surface soil samples were collected by ENV America in a

relative grid pattern across the Site. Soil samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg); benzene, toluene, ethylbenzene and xylenes (BTEX); TPH as diesel (TPHd); TPH as motor oil (TPHmo); California Title 22 (CAM 17) Metals; VOCs; semi-VOCs (SVOCs [including PAHs]); polychlorinated biphenyls (PCBs); organochlorides; herbicides; and cyanide.

• 2008 and 2009: The Remedial Investigation (RI) was conducted by Stantec at the Site in

2008 and 2009 to characterize the levels and types of chemicals present in soils, soil gas, and groundwater for the purposes of remediation planning and implementation. During Phase I of the RI in October 2008, between three and seven soil samples were collected from 16 on-site soil borings advanced to a maximum depth of 15 feet below ground surface (bgs) and two grab groundwater samples were collected from 2 additional on-site borings advanced to first-encountered groundwater at approximately 65 feet bgs. A passive soil gas survey was conducted in October/November 2008 where samples were collected between 6.5 to 8 feet bgs at 17 locations at the Site and analyzed for VOCs and PAHs. Local metals background samples were also collected in November 2008 from 6 off-site locations at 0 and 2 feet bgs. Based on the result of the passive soil gas survey, an active soil gas survey was conducted in July 2009 and soil gas samples were collected



at depth intervals of 5 feet bgs and 8 feet bgs from 6 locations and analyzed for VOCs. During Phase II of the RI in November 2009, between three to six soil samples were collected an additional 9 soil borings advanced at the Site, 8 soil borings within and adjacent to South Sacramento Street, and 12 soil borings at the adjacent LIW property. Soil borings were advanced to depths of 12 to 15 feet, with the exception of several on-site soil borings extended to depths ranging from 27 to 70 feet bgs. In addition, grab groundwater samples were collected from 2 of the on-site soil borings. All soil samples collected during Phase I and II of the RI were analyzed for TPHg, BTEX, TPHd, TPHmo, CAM 17 Metals, PAHs, and cyanide. Grab groundwatere samples were analyzed for for TPHg, BTEX, TPHd, TPHmo, dissolved CAM 17 Metals, PAHs, and cyanide.

• 2010: Remedial Refinement Sampling was conducted at the Site in 2010 by Stantec to

further characterize and delineate levels and types of chemicals present in soils for the purposes of remediation planning and implementation. The scope of work included excavation of 11 test pits to 9 feet bgs, and advancement of 21 direct-push soil borings to a maximum depth of 25 feet bgs to investigate various historical subsurface features and to provide additional delineation of chemical impacts to soils at the Site, and advancement of 5 direct-push soil borings to a maximum depth of 10 feet bgs within South Sacramento Street to provide additional delineation of chemical impacts to soil identified during previous work. Soil samples collected during the Remedial Refinement Investigation were analyzed for TPHg, BTEX, TPHd, TPHmo, CAM 17 Metals, PAHs, total cyanide, and/or ammonia.

Nature and Extent of Impacts The information on nature and extent of impacts has been primarily obtained from the RI Report (Stantec, 2010) and the Feasibility Study/Removal Action Workplan (FS/RAW) to which this HRA is an appendix. On-site Soils Historical gas manufacturing operations at the Site have resulted in chemical impacts to shallow soils in portions of the Site particularly between the ground surface and 5 feet bgs. Chemical impacts are primarily associated with petroleum hydrocarbons, PAHs, and lead. A former redwood oil storage tank appears to have been abandoned in place, and impacted soils have been observed within the fill material inside the former tank and beneath the tank to a depth of approximately 21 feet bgs in the immediate vicinity of the former tank. The vertical extent of chemical impacts have been delineated, and underlying soils to a depth of 65 feet bgs were observed to be unimpacted, indicating no potential threat to groundwater. A former oil conveyance pipeline may still be in place at the Site. Investigation of this feature has identified chemical impacts to depths ranging from 5 to 12 feet bgs.



Two above-ground former MGP waste receptacles (identified on drawings as ‘former lampblack separators’) were historically located in the southeast quadrant of the Site. Investigation of this area has revealed the presence of approximately 1.5 feet of concrete underlain by native soils. Lampblack was identified between 5 and 5.5 feet bgs in one of three soil borings (SB-8) advanced beneath the former separator, and elevated concentrations of petroleum hydrocarbons and PAHs have been identified to 6.5 feet bgs. Former gas storage holder #3 was historically located in the southwest quadrant of the Site. The footprint of the holder extended beyond the current property boundary into South Sacramento Street, across the parcel of land sold to the City of Lodi for the purpose of street widening. Investigation of the historical gas storage holder #3 has revealed the presence approximately 3 feet of concrete, underlain by native soils impacted by lampblack and elevated PAHs to depths of 4 feet bgs. Historical investigations have identified several areas where chemical impacts to soil extend beyond the upper 5 feet bgs:

• Test Pit TP-2: Test pit TP-2, advanced near the northern property line, identified elevated concentrations of PAHs to 6 feet bgs. Based on data from surrounding soil borings, the extent of chemical impact at TP-2 appears to be limited in extent.

• Test Pit TP-11: Test pit TP-11, advanced west of the former lampblack separators,

identified elevated concentrations of PAHs to 9 feet bgs. Based on data from additional soil borings advanced in this area, the extent of chemical impact at TP-11 appears to be limited in extent.

• Southern Property Boundary: An area along the southern property boundary contains

elevated PAHs to a depth of approximately 6 feet bgs

• Eastern Property Boundary: An area along the eastern property boundary, in the vicinity of the former oil conveyance pipe, contains elevated PAHs, petroleum hydrocarbons, and lead to a depth of approximately 6 feet bgs.

Off-site Soils Investigation of soils beneath South Sacramento Street has identified chemical impacts to soils consistent with historical MGP operations. In general, shallow soils within the area of the street historically part of the Site (roughly to the current centerline of South Sacramento Street) contain shallow chemical impacts from elevated PAHs, petroleum hydrocarbons and lead, consistent with shallow soil conditions elsewhere on the Site. Deeper impacts (to 6 feet bgs) have been identified at locations in the center of the street, adjacent to the historical gas holders. Previous investigations identified two historical gas distribution pipelines leaving the Site from the former general shop and store room (see Figure 2). These conduits are severed approximately 15 feet into the Street, and underlying soils have not been impacted.



Chemical impacts consistent with MGP waste products (i.e., elevated concentrations of petroleum hydrocarbons found with elevated concentrations of PAHs) have been identified in shallow soils on the Lodi Iron Works (LIW) property to the south. In general, these concentrations are present in surface soils, attenuate to below screening levels between the ground surface and 3 feet bgs, and are present within 15 feet of the fence line. Soil Gas Soil gas conditions beneath the Site have been characterized using passive and active soil gas sampling methods. The passive soil gas survey revealed relatively elevated mass of TPH, BTEX, naphthalene, and combined PAHs at SB-14, located along the southern edge of the Site. Relatively elevated mass of TPH and BTEX were also reported from SB-2, advanced adjacent to the former purifiers in the northern third of the Site. Based on results of the passive soil gas survey data, semi-permanent soil gas sampling points were installed at six locations. Soil gas sampling locations SG-2 and SG-6 corresponded to the highest reported concentrations of VOCs and/or naphthalene reported during the passive soil gas survey (SB-2 and SB-14, respectively). The highest concentrations of BTEX constituents in soil gas were reported in shallow and deep samples from SG-2 and SG-6. Detected concentrations of VOCs including naphthalene were, in general, low. However, note that the laboratory reporting limits for naphthalene in five samples (SG-2S, SG-2D, SG-4D, SG-6S, and SG-6D) considerably elevated (i.e., 6- to 29-times higher than the lowest laboratory reporting limit for naphthalene). Groundwater Low concentrations of petroleum hydrocarbons consistent with a weathered fuel product were detected in groundwater beneath the Site. Based on the chemical composition of constituents in groundwater, the significant vertical separation between impacted soils and first-encountered groundwater (greater than 40 feet), and the low migration potential of MGP-related constituents, these detections appear to be unrelated to historical site operations and warrant no further investigation. Groundwater sampling in the vicinity of the former MGP water supply wells confirms the wells did not act as pathways for migration of contaminants to groundwater. Identification of Chemicals of Potential Concern All data collected during the 2006 surface soil sampling, the 2008-2009 RI, and the 2010 Remedial Refinement Investigation were evaluated for use in the quantitative HRA. All chemicals that were detected above background/ambient levels in soils and all chemicals detected in soil gas were included as chemicals of potential concern (COPCs) in the quantitative analysis.



Chemicals detected in soils that are included as COPCs in the quantitative HRA are as follows: various VOCs (including benzene, toluene, ethylbenzene, and xylenes [BTEX]); TPH (gasoline, diesel, and motor oil ranges); various PAHs, and various inorganics. Chemical detected in soil gas that are included as COPCs in the quantitative HRA are as follows: 1,1-difluoroethane, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 2-butanone (MEK), 2-hexanone, 4-ethyltoluene, acetone, benzene, carbon disulfide, isopropylbenzene (cumene), ethanol, dichlorodifluoromethane (Freon 12), ethylbenzene, heptane, methyl tert-butyl ether (MTBE), naphthalene, propylbenzene, styrene, tetrachloroethene, toluene, trichlorofluoromethane (Freon 11), trichloroethene, and total xylenes. Potentially Exposed Populations and Complete Exposure Pathways The Site is currently vacant. Access to the Site is controlled by fencing topped with barbed wire. The Site is bounded on the west by South Sacramento Street and on the east by Union Pacific Railroad tracks. Immediately north of the Site is Jorge’s Auto Body, an auto-body repair shop. Immediately south of the Site is a vacant lot owned by Lodi Iron Works. Immediately across South Sacramento Street to the west is single-family residential housing. Under current conditions, the majority of the surface of the Site is unpaved. The primary pathway through which current off-site residents and off-site commercial workers could potentially be exposed to COPCs in soil or soil gas includes the inhalation of volatile constituents that have migrated up through the soil column into the ambient air and through the inhalation of fugitive dusts from the exposed soils at the Site. In the future, it is possible that the Site could be redeveloped for residential purposes and direct exposure to the COPCs in the surface and subsurface soils could occur. Thus, future on-site residents are assumed to be exposed to COPC in soil across the Site through direct contact (i.e., soil ingestion, dermal contact with soil), as well as through the inhalation of particulates/vapors that could be present in the indoor/ambient air. Results and Conclusions of the HRA Current Off-site Residential and Commercial Scenarios HRA results indicate that none of the chemicals detected in exposed surface soils and soil gas at the Site pose a significant health risk to current off-site residential and commercial populations. Estimated incremental cancer risks and noncancer HIs for these populations are well below 1 x 10-6 and 1, respectively. Further, levels of lead in exposed soils at the Site are not expected to result in an increase in blood lead levels above OEHHA’s benchmark value of 1 ug/dL for current off-site residential and commercial populations. Based on these conservative upper-bound risk estimates, remedial action, or other form of risk management, is not necessary to protect the health of current off-site residential and commercial populations. Future On-site Residential Scenario This HRA also evaluates potential health risks to future on-site residential populations. In the future, it is possible that the Site could be redeveloped for residential purposes and buildings



could be constructed anywhere on the Site. The results of this HRA indicate that the estimated incremental cancer risks and noncancer hazards associated with COPCs in soil gas via vapor intrusion for future on-site residential populations are at or below acceptable levels (i.e., incremental cancer risks are equivalent to or below the lower end of the acceptable risk range of 1 x 10-6 to 1 x 10-4 and the noncancer HIs are below 1). We note, however, the estimated incremental cancer risks for the future on-site residential population are based on existing soil gas data collected during the RI. Soil sampling results have indicated areas of elevated benzene and/or naphthalene concentrations in soils (i.e., at SB-6 and SB-49) where no soil gas data was collected. These areas will be addressed in the Feasibility Study/Removal Action Workplan (FS/RAW). The estimated incremental cancer risks associated with COPCs in soils for the future on-site residential population are above the acceptable risk range of 1 x 10-6 to 1 x 10-4, due principally to the presence of CPAHs, naphthalene, and benzene in soils. The estimated noncancer hazards for the future on-site residential populations are also above the acceptable HI of 1, due primarily to naphthalene, pyrene, cobalt, benzene, and fluoranthene in soils. Further, the levels of lead in soils at the Site could result in an increase in blood lead levels above OEHHA’s benchmark value of 1 ug/dL for residential populations. Accordingly, the results of the HRA support that levels of CPAHs, naphthalene, pyrene, cobalt, benzene, fluoranthene, and lead present in soils would require some remediation or other form of risk management (e.g., institutional controls) in the event that the Site were to be developed in the future for residential purposes.


1-1 IRIS ENVIRONMENTAL

1.0 INTRODUCTION AND OBJECTIVES Iris Environmental prepared this human health risk assessment (HRA) on behalf of Pacific Gas and Electric Company (PG&E) for the Former Lodi Manufactured Gas Plant Site (the “Site”), located at 712 South Sacramento Street in Lodi, California (Figure 1). The Site was formerly a crude oil manufactured gas plant, which was previously operated and is currently owned by PG&E. The 0.73-acre Site is currently vacant and fenced. The primary purpose of this HRA, as presented and further outlined in a memorandum submitted to the Department of Toxic Substances Control (DTSC) (Iris Environmental, 2010), is to evaluate potential risks to current and/or future populations that could be exposed to Site-related chemicals at the former Lodi MGP Site. As the Site is currently vacant and fenced, the scope of the HRA focuses primarily on evaluations associated with the potential future unrestricted use of the Site for hypothetical residential purposes. The results of the HRA will be used to identify areas of the Site where remediation, or other forms of risk management, may be appropriate, with the overall goal of long-term protection of human health and the environment. The methodology used in this HRA is consistent with risk assessment guidelines provided by the United States Environmental Protection Agency’s (USEPA) “Risk Assessment Guidance for Superfund, Volume I, Human Health Evaluation Manual (Part A), Interim Final” (USEPA, 1989a) and by the California Environmental Protection Agency (Cal/EPA), Department of Toxic Substances Control’s (DTSC) “Preliminary Endangerment Assessment Manual” (Cal/EPA, 1994). According to the USEPA (1989a), and as summarized below, there are four basic steps in the quantitative human health risk assessment process: (1) data collection and analysis, (2) exposure assessment, (3) toxicity assessment, and (4) risk characterization. These steps are summarized briefly as follows:

• Data Collection and Analysis: For this HRA, all Site environmental soil and soil gas sampling data were reviewed to identify the chemicals of potential concern (COPCs) and their representative concentrations to which populations could be exposed. The dataset for the HRA was obtained from the 2006 Surface Soil Sampling conducted by ENV America, the 2008 and 2009 Remedial Investigation (RI) conducted by Stantec Consulting Corporation (Stantec), and the 2010 Remedial Refinement Investigation also conducted by Stantec;

• Exposure Assessment: Site uses and physical features were evaluated to develop a

conceptual Site model (CSM), which identifies the pathways by which potential current and future receptors could be exposed to COPCs. The magnitude of the potential human exposures was also estimated;

• Toxicity Assessment: This phase of the risk assessment presents the relationship

between the magnitude of exposure and potential adverse effects (dose-response assessment). As a part of the toxicity assessment, toxicity values were identified from the Cal/EPA-recommended sources, and were then used to estimate the likelihood of adverse effects which could potentially occur at different exposure levels; and,



• Risk Characterization: The exposure and toxicity assessments were combined to characterize and quantify the potential for adverse health effects as a result of potential Site-specific exposures. The risk characterization estimates the likelihood that the estimated potential exposures to COPCs at the Site will result in either cancer or other noncancer adverse health effects.

The remaining sections of this report are as follows:

• Section 2.0 provides a description of the Site features and brief summaries of the previous site investigations.

• Section 3.0 discusses the analytical data and identifies the COPCs that have been included in this HRA.

• Section 4.0 identifies the populations that may potentially be exposed to Site COPCs, the pathways by which potential exposures may occur, and the exposure assumptions used to quantify potential exposures. Section 4.0 also presents the methodology for estimating representative exposure concentrations for chemicals present in soils and air.

• Section 5.0 presents the toxicity values used in the calculation of the incremental cancer risks and noncancer hazard indices. Section 5.0 also presents the methodology for evaluating health effects associated with the lead detected in soils.

• Section 6.0 presents the methodology used to calculate the incremental cancer risks and noncancer hazard indices and summarizes the results of the HRA.

• Section 7.0 presents an overview of the remedial action goals for the Site, the methodology used to derive risk-based screening concentrations (RBSCs) or ambient-based screening concentrations (ABSCs), and a comparison of detected concentrations to RBSCs or ABSCs to identify locations, if any, where remediation or other forms of risk management (e.g., institutional controls) may be appropriate, with the overall goal of long-term protection of human health and the environment.

The references used in this report are presented in Section 8.0. There are six attachments that accompany the report. Attachment A presents all Site investigation data used in the calculations of health risks in this HRA. The determination of ambient arsenic concentrations is presented in Attachment B. Attachment C presents the outputs of the statistical evaluation for the estimation of representative exposure concentrations for chemicals present in soils. Attachment D presents the fate and transport modeling used to estimate the emissions of COPCs from the Site and the corresponding predicted air concentrations to which the various human populations may be exposed. Attachment E discusses the uncertainties inherent in the HRA. An example RBSC calculation for naphthalene is provided in Attachment F.



2.0 SITE DESCRIPTION AND SUMMARY OF SITE INVESTIGATIONS This section provides a brief description of the features and current uses of the Site as well as brief summaries of the Site investigations conducted to date. The information in this section has been primarily obtained and summarized from the RI Report (Stantec, 2010) and from Feasibility Study/Removal Action Workplan (FS/RAW) to which this HRA is an appendix. 2.1 Site Description The 0.73 acre Site is located at 712 South Sacrament Street in Lodi, California. A Site location map is provided in Figure 1. The Site is bounded on the west by South Sacramento Street and on the east by Union Pacific Railroad tracks. Immediately north of the Site is Jorge’s Auto Body, an auto-body repair shop. Immediately south of the Site is a vacant lot owned by Lodi Iron Works (LIW). Immediately across South Sacramento Street to the west is single-family residential housing. Currently the Site is vacant and fenced, and the majority of the surface at the Site is unpaved. The Site is situated on relatively flat terrain and the general topographic grade in the vicinity of the Site is to the west-southwest. The soils beneath the Site are classified as Tokay fine sandy loam. This soil is well-drained and does not meet the hydrologic requirements of a hydric soil. The soil type is within Hydrologic Group B, indicating that it has moderate infiltration rates and moderately coarse texture. The City of Lodi is part of the Eastern San Joaquin Groundwater Basin. Lodi is underlain by alluvial soils deposited by runoff from surrounding mountain ranges. The alluvial layers are part of the major aquifer system that runs the length of the valley. The aquifer is recharged by the Mokelumne River which borders the City of Lodi to the north. Groundwater in the City of Lodi ranges from 20 feet below ground surface (bgs) in the northwest to 60 feet bgs in the south (City of Lodi, 2006). General groundwater flow within the City of Lodi is to the south (City of Lodi Water Pollution Control Facility, 2006). The Site is located within the Lodi groundwater investigation area. An investigation of tetrachloroethene (PCE)-impacted and trichloroethene (TCE)-impacted soil and groundwater has been ongoing throughout northeast and central Lodi since 1989, when the contaminants were first detected in city water supply wells. These contaminants were released from facilities approximately 3,000 feet north-northwest of the Site. The Site is located within the southern distal end of the PCE plume, approximately 600 feet southwest of Lodi well MW-24A and approximately 1,000 feet north-northwest of Lodi well MW-21A. Hydrogeologic information for the area and the Site is based on the document entitled, “Report of Third Quarter 2007 Groundwater Monitoring, Central Plume Area, Lodi, California,” (Third Quarter 2007 Report) provided by the California Regional Water Quality Control Board (RWQCB) for the Lodi Central Plume Area (Treadwell and Rollo, 2008). Based on the data provided in the report, the upper groundwater zone in the general area of the Site is approximately 60 ft-bgs with groundwater flow to the south with a gradient of approximately 0.003 feet per feet.



2.2 Summary of Site Investigations Site investigations were conducted at the Site and off-site between mid-1980’s and 2009, and are described in more detail in the RI Report (Stantec, 2010). As discussed in the RI Report, previous site investigations included the following:

• Mid-1980s: One surface soil sample was collected at the Site by PG&E in the mid-1980s. The location of this historical sample is unknown. The results of the soil sample indicated the presence of polycyclic aromatic hydrocarbons (PAHs) at a concentration of 34 milligrams per kilogram (mg/kg), arsenic at 2.2 mg/kg, lead at 530 mg/kg, mercury at 0.21 mg/kg, and cyanide at 1.5 mg/kg. No additional investigation was conducted based on this soil sample.

• 2006: In February 2006, nine surface soil samples (SS-1 through SS-9) were collected by

ENV America in a relative grid pattern across the Site. Soil samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg); benzene, toluene, ethylbenzene and xylenes (BTEX); TPH as diesel (TPHd); TPH as motor oil (TPHmo); California Title 22 (CAM 17) Metals; volatile organic compounds (VOCs); semi-VOCs (SVOCs [including PAHs]); polychlorinated biphenyls (PCBs); organochlorides; herbicides; and cyanide.

The Remedial Investigation (RI) was conducted at the Site in 2008 and 2009 by Stantec to characterize the levels and types of chemicals present in soils, soil gas, and groundwater for the purposes of remediation planning and implementation. The RI included the following soil, soil gas, and groundwater sampling and analysis:

• Subsurface Investigation - Phase I (October 2008): 16 direct-push soil borings were advanced to a maximum depth of 15 feet bgs. Between three and seven soil samples were collected from each soil boring. Soil samples were analyzed for TPHg, BTEX, TPHd, TPHmo, CAM 17 Metals, PAHs, and cyanide. Two soil borings (GW-1 and GW-2) were advanced to first-encountered groundwater at approximately 65 feet bgs. Grab groundwater samples were collected from these soil borings and analyzed for for TPHg, BTEX, TPHd, TPHmo, dissolved CAM 17 Metals, PAHs, and cyanide.

• Passive Soil Gas Sampling (October/November 2008): A passive soil gas survey was

conducted at the Site using passive diffusion sampling devices manufactured by Gore™ (formerly Gore-Sorber®). The sampling modules were installed at 6.5 to 8 feet bgs at 17 locations and left in place for 17 days before being retrieved and analyzed for VOCs and PAHs.

• Local Background Sampling (November 2008): Twelve local background soil samples

(locations PS-1 through PS-6 at 0 and 2 feet bgs) were collected and analyzed for CAM 17 Metals.



• Active Soil Gas Sampling (July 2009). Soil gas sampling probes were installed at six locations, based in part on the findings of the passive soil gas survey. Soil gas samples were collected at depth intervals of 5 feet bgs and 8 feet bgs and analyzed for VOCs.

• Subsurface Investigation – Phase II (November 2009). An additional nine soil borings

were advanced at the Site, eight soil borings within and adjacent to South Sacramento Street, and 12 soil borings at the adjacent LIW property. Soil borings were advanced to depths of 12 to 15 feet, with the exception of several on-site soil borings extended to depths ranging from 27 to 70 feet bgs. Three to six soil samples were collected from each boring. Soil samples were analyzed for TPHg, BTEX, TPHd, TPHmo, CAM 17 Metals, PAHs, and cyanide. Grab groundwater samples were collected from two of the on-site soil borings and and analyzed for for TPHg, BTEX, TPHd, TPHmo, dissolved CAM 17 Metals, PAHs, and cyanide.

A final RI report was submitted to the DTSC in June 2010 and approved on June 14, 2010 (Stantec, 2010). Additional Remedial Refinement Investigation was conducted by Stantec at the Site in July and September 2010 to further characterize and delineate the levels and types of chemicals present in soils. The scope of work during the 2010 Remedial Refinement Investigation consisted of the following:

• Excavation of 11 test pits to 9 feet bgs, and advancement of 11 direct-push soil borings to a maximum depth of 25 feet bgs to investigate various historical subsurface features and to provide additional delineation of chemical impacts to soils;

• Advancement of 3 soil borings using an air knife to investigate historical gas distribution

lines entering South Sacramento Street from the northwest corner of the site; and

• Advancement of 1 direct-push soil boring to 10 feet bgs within South Sacramento Street to further delineate elevated chemical concentrations previously detected in shallow soils.

• Advancement of 4 direct-push soil borings along the northern property boundary to

investigate the extent of potential MGP-related impacts to soil;

• Advancement of 4 direct-push soil borings within South Sacramento Street to provide additional delineation of chemical impacts to soil identified during previous work; and,

• Advancement of 4 direct-push soil borings to in the vicinity of test pit TP-11 to further

delineate chemical impacts previously identified at this location. Soil samples collected during the Remedial Refinement Investigation were analyzed for TPHg, BTEX, TPHd, TPHmo, CAM 17 Metals, PAHs, total cyanide, and/or ammonia. A Site plan with soil, soil gas, and groundwater sample locations from the 2006 Surface Soil Sampling, the 2008 and 2009 RI and the 2010 Remedial Refinement Investigation is provided in Figure 2.



2.3 Summary of Nature and Extent of Impacts On-site Soils Historical gas manufacturing operations at the Site have resulted in chemical impacts to shallow soils in portions of the Site particularly between the ground surface and 5 feet bgs. Chemical impacts are primarily associated with petroleum hydrocarbons, PAHs, and lead. A former redwood oil storage tank appears to have been abandoned in place, and impacted soils have been observed within the fill material inside the former tank and beneath the tank to a depth of approximately 21 feet bgs in the immediate vicinity of the former tank. The vertical extent of chemical impacts have been delineated, and underlying soils to a depth of 65 feet bgs were observed to be unimpacted, indicating no potential threat to groundwater. A former oil conveyance pipeline may still be in place at the Site. Investigation of this feature has identified chemical impacts to depths ranging from 5 to 12 feet bgs. Two above-ground former MGP waste receptacles (identified on drawings as ‘former lampblack separators’) were historically located in the southeast quadrant of the Site. Investigation of this area has revealed the presence of approximately 1.5 feet of concrete underlain by native soils. Lampblack was identified between 5 and 5.5 feet bgs in one of three soil borings (SB-8) advanced beneath the former separator, and elevated concentrations of petroleum hydrocarbons and PAHs have been identified to 6.5 feet bgs. Former gas storage holder #3 was historically located in the southwest quadrant of the Site. The footprint of the holder extended beyond the current property boundary into South Sacramento Street, across the parcel of land sold to the City of Lodi for the purpose of street widening. Investigation of the historical gas storage holder #3 has revealed the presence approximately 3 feet of concrete, underlain by native soils impacted by lampblack and elevated PAHs to depths of 4 feet bgs. Historical investigations have identified several areas where chemical impacts to soil extend beyond the upper 5 feet bgs:

• Test Pit TP-2: Test pit TP-2, advanced near the northern property line, identified elevated concentrations of PAHs to 6 feet bgs. Based on data from surrounding soil borings, the extent of chemical impact at TP-2 appears to be limited in extent.

• Test Pit TP-11: Test pit TP-11, advanced west of the former lampblack separators,

identified elevated concentrations of PAHs to 9 feet bgs. Based on data from additional soil borings advanced in this area, the extent of chemical impact at TP-11 appears to be limited in extent.



• Southern Property Boundary: An area along the southern property boundary contains elevated PAHs to a depth of approximately 6 feet bgs

• Eastern Property Boundary: An area along the eastern property boundary, in the vicinity

of the former oil conveyance pipe, contains elevated PAHs, petroleum hydrocarbons, and lead to a depth of approximately 6 feet bgs.

Off-site Soils Investigation of soils beneath South Sacramento Street has identified chemical impacts to soils consistent with historical MGP operations. In general, shallow soils within the area of the street historically part of the Site (roughly to the current centerline of South Sacramento Street) contain shallow chemical impacts from elevated PAHs, petroleum hydrocarbons and lead, consistent with shallow soil conditions elsewhere on the Site. Deeper impacts (to 6 feet bgs) have been identified at locations in the center of the street, adjacent to the historical gas holders. Previous investigations identified two historical gas distribution pipelines leaving the Site from the former general shop and store room (see Figure 2). These conduits are severed approximately 15 feet into the Street, and underlying soils have not been impacted. Chemical impacts consistent with MGP waste products (i.e., elevated concentrations of petroleum hydrocarbons found with elevated concentrations of PAHs) have been identified in shallow soils on the LIW property to the south. In general, these concentrations are present in surface soils, attenuate to below screening levels between the ground surface and 3 feet bgs, and are present within 15 feet of the fence line. Soil Gas Soil gas conditions beneath the Site have been characterized using passive and active soil gas sampling methods. The passive soil gas survey revealed relatively elevated mass of TPH, BTEX, naphthalene, and combined PAHs at SB-14, located along the southern edge of the Site. Relatively elevated mass of TPH and BTEX were also reported from SB-2, advanced adjacent to the former purifiers in the northern third of the Site. Based on results of the passive soil gas survey data, semi-permanent soil gas sampling points were installed at six locations. Soil gas sampling locations SG-2 and SG-6 corresponded to the highest reported concentrations of VOCs and/or naphthalene reported during the passive soil gas survey (SB-2 and SB-14, respectively). The highest concentrations of BTEX constituents in soil gas were reported in shallow and deep samples from SG-2 and SG-6. Detected concentrations of VOCs including naphthalene were, in general, low. However, note that the laboratory reporting limits for naphthalene in five samples (SG-2S, SG-2D, SG-4D, SG-6S, and SG-6D) considerably elevated (i.e., 6- to 29-times higher than the lowest laboratory reporting limit for naphthalene).



Groundwater Low concentrations of petroleum hydrocarbons consistent with a weathered fuel product were detected in groundwater beneath the Site. Based on the chemical composition of constituents in groundwater, the significant vertical separation between impacted soils and first-encountered groundwater (greater than 40 feet), and the low migration potential of MGP-related constituents, these detections appear to be unrelated to historical site operations and warrant no further investigation. Groundwater sampling in the vicinity of the former MGP water supply wells confirms the wells did not act as pathways for migration of contaminants to groundwater.



3.0 DATA EVALUATION AND SELECTION OF CHEMICALS OF POTENTIAL CONCERN

This section discusses the analytic data collected during the site investigations and the COPCs selected for inclusion in the HRA. 3.1 Data Evaluation All data collected on-site and off-site during previous Site investigations, as discussed in Section 2.0, were evaluated for use in the HRA. All soil and soil gas data collected during the 2006 Surface Soil Sampling, the 2008 and 2009 RI, and the 2010 Remedial Refinement Investigation were evaluated for inclusion in the HRA. For purposes of remedial decision-making, the boundary of ‘Site’ will include:

• street to the west of the Site (South Sacramento Street), and • 30-foot strip on LIW property directly south of Site.

As such, all data collected off-site in South Sacramento Street and on LIW property are included in the dataset used in the quantitative HRA. As concluded in the RI Report (Stantec, 2010) and mentioned previously in Section 2.3, the low concentrations of petroleum hydrocarbons and related constituents detected in groundwater appear to be unrelated to historical site operations. Therefore, groundwater data collected during the RI was not evaluated in the HRA. All Site investigation data used in the HRA are compiled and presented in Attachment A. 3.2 Selection of Chemicals of Potential Concern The selection of COPCs for the quantitative HRA was based on guidance provided by USEPA (1989a) and Cal/EPA (1997). In general, all chemicals detected in the soil and soil gas samples were initially included in the quantitative HRA. Cal/EPA guidance calls for the exclusion of inorganic chemicals from the quantitative risk assessment if they are detected at levels within the local background/ambient concentrations. As previously mentioned in Section 2.0, twelve local background soil samples (samples collected from sample locations PS-1 through PS-6 at 0 and 2 feet bgs) were collected and analyzed for CAM17 Metals during the RI. The specific approach used to assess whether the metals are present within ambient levels was conservative and intentionally erred on the side of including chemicals in the quantitative analysis. Specifically, if the maximum detected concentration and the 95% upper confidence limit (UCL) of the arithmetic mean concentration detected in the on-site samples were above the respective maximum detected concentration and 95% UCL of the local background samples, then the inorganic compound was included in the quantitative risk assessment. This conservative screening approach was used for all metals with the exception of



arsenic. Using DTSC’s approach for establishing an ambient level for arsenic, arsenic concentrations at the Site were determined to be representative of ambient levels; arsenic was therefore excluded from analysis in the HRA. The analysis of Site arsenic concentrations and the determination of ambient arsenic concentrations are provided in Attachment B. Similarly, concentrations of carcinogenic polycyclic aromatic hydrocarbons (CPAHs) at the Site were compared to ambient levels. As CPAHs are virtually ubiquitous in surface soils, a comparison to ambient concentrations is one method useful in the determination of whether there are significant concentrations of CPAHs at a site compared to ambient concentrations. A dataset of ambient concentrations for CPAHs developed for the northern California area was used in this HRA for comparison. The dataset was compiled from previous site investigations in northern California conducted with the oversight of DTSC by PG&E and the United States Navy. The dataset was developed in cooperation and collaboration with a task group of representatives from the Human and Ecological Risk Division (HERD) 1 and Site Mitigation branches of DTSC, Cal/EPA. The team of consulting firms involved in the development of the database were ENVIRON, Entrix, Iris Environmental, and ENV America. The final dataset consists of eighty-six data points from twenty-one different sites. The details of this study are presented in a report that was submitted to HERD on June 7, 2002 (ENVIRON et al., 2002). DTSC has issued an Advisory (Cal/EPA, 2009a) that supports the use of the PAH background dataset as a tool for assessing PAH impacts and making remediation decisions for PAHs at sites. The arithmetic mean and the 95% UCL of the mean of the background CPAH dataset, in benzo(a)pyrene (B[a]P) equivalents, are 0.21 mg/kg and 0.40 mg/kg, respectively. Calculated B(a)P equivalent values in the background dataset range from non-detect (ND, <0.0027 milligrams per kilogram [mg/kg]) to 2.813 mg/kg. As indicated in Tables 1 and 2, the 95% upper confidence levels (UCLs) for B(a)P equivalents in on-site soils are above the 95% UCL of the background dataset of 0.40 mg/kg, and therefore CPAHs were retained as a COPC for these soil datasets and included in the quantitative HRA. Chemicals detected in soils and soil gas that are included in the quantitative HRA are summarized below:

• Soils (Tables 1 and 2): The COPCs detected in soils that are included in the quantitative HRA are as follows: various VOCs (including benzene, toluene, ethylbenzene, and xylenes [BTEX]); TPH (gasoline, diesel, and motor oil ranges); various PAHs, and various inorganics;

• Soil Gas (Table 3): The COPCs detected in soil gas that are included in the quantitative HRA are as follows: 1,1-difluoroethane, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 2-butanone (MEK), 2-hexanone, 4-ethyltoluene, acetone, benzene, carbon disulfide, isopropylbenzene (cumene), ethanol, dichlorodifluoromethane (Freon 12), ethylbenzene, heptane, methyl tert-butyl ether (MTBE), naphthalene, propylbenzene, styrene,

1 The Human and Ecological Risk Division has been renamed and is currently referred to as the Office of Human and Ecological Risk (HERO).



tetrachloroethene, toluene, trichlorofluoromethane (Freon 11), trichloroethene, and total xylenes.

According to the existing DTSC risk assessment guidance (Cal/EPA, 1994), risks to human health associated with the presence of TPH are assessed by evaluating the significance of individual chemical constituents within the TPH mixture (e.g., BTEX and PAHs). The DTSC had released a TPH Interim Guidance which describes an approach for evaluating TPH as a mixture in a risk assessment (Cal/EPA, 2009b). However, as of mid-June 2010, the TPH Interim Guidance is no longer available on DTSC’s web-site, and the web-site specifically states: “This guidance document is no longer active. Future approaches to petroleum hydrocarbon contamination will be part of the revised PEA [Preliminary Endangerment Assessment] Guidance Manual.” It is our understanding that moving forward, DTSC’s revised PEA Manual will allow health risks associated with weathered TPH, such as those associated with former MGP sites, to be quantified by relying on the estimated risks for the individual chemical constituents in TPH, as originally recommended in DTSC’s 1994 PEA Manual (Cal/EPA 1994). Based on conversations with representatives from DTSC’s Human and Ecological Risk Office (HERO), we understand that one of the reasons for removing the Interim Guidance is that it may not be a useful tool in remedial decision making for weathered petroleum releases. One example is that many of the toxicity values for TPH recommended in the Interim Guidance are based on fresh petroleum product streams and/or mixtures; such studies may not be representative or relevant for evaluating the toxicity of weathered petroleum releases, such as those associated with MGP operations. As the TPH associated with residues potentially associated with MGP operations are weathered, an appropriate method for evaluating health risks associated with the TPH is to rely on the specific individual constituents measured in the samples. Therefore, this HRA evaluates the toxicity of TPH by evaluating the individual compounds that are likely to be associated with the TPH (e.g., BTEX and PAHs). We note that there are other approaches for evaluating health risks associated with TPH (i.e., TPH Criteria Working Group and Massachusetts Department of Health approaches). The limitations/uncertainties associated with the various approaches for evaluating weathered TPH will be discussed in the Uncertainties in the Risk Assessment (Attachment E).



4.0 EXPOSURE ASSESSMENT To determine whether the levels of chemicals present in soils and soil gas at the Site would pose a risk to human populations, it is necessary to identify the populations that may potentially be exposed to the chemicals present in soils and soil gas and determine the pathways by which the exposures may occur. Identification of the potentially exposed populations requires an evaluation of the potential current and future land use(s) of the Site. Once the potentially exposed populations are identified, the complete exposure pathways by which the individuals may contact chemicals present in soils and soil gas must be determined. A Conceptual Site Model (CSM) is used (Figure 3) to show the relationship between the chemical sources, exposure pathways and potential receptors at the Site. These source-pathway-receptor relationships provide the basis for the quantitative exposure assessment. Only those complete source-pathway-receptor relationships are included in the HRA. The following section presents a discussion of the chemical sources and potential transport mechanisms, identifies potentially exposed populations and complete and incomplete exposure pathways, discusses the human intake assumptions used in the HRA, and summarizes the methodology for estimating representative exposure concentrations. 4.1 Chemical Sources and Potential Release Mechanisms On-site activities associated with the historical operations of the former MGP have likely resulted in the release of chemicals to the soils. These releases are indicated by the detection of certain chemicals, particularly PAHs, in the soils during the Site investigation activities. Once the chemicals associated with the former MGP operations are released into the surface and subsurface soils, the potential secondary release mechanisms include the following:

• volatilization of constituents in soils into ambient (i.e., outdoor) or indoor air; • wind erosion and atmospheric dispersion of particulate-bound constituents; • migration of constituents from the subsurface soils down into the groundwater; • off-site transport of chemicals in soils through surface water runoff.

The mechanisms listed above represent the theoretically complete mechanisms through which chemicals at the Site can be released and transported from one environmental medium to another. A discussion of each of these transport mechanisms and resulting human exposure routes, including those that are considered to be incomplete, is incorporated into the subsequent sections. 4.2 Identification of Potentially Exposed Populations As described above, the goal for the Site is to ensure that chemicals present at the Site would not pose an unacceptable risk to the health of current or future populations. Accordingly, the



primary focus of the HRA is on those exposure pathways that would be considered complete for the current and future land-use scenarios. Under current conditions, the Site is vacant. Access to the Site is controlled by fencing topped with barbed wire. The Site is bounded on the west by South Sacramento Street and on the east by Union Pacific Railroad tracks. Immediately north of the Site is Jorge’s Auto Body, an auto-body repair shop. Immediately south of the Site is a vacant lot owned by Lodi Iron Works. Immediately across South Sacramento Street to the west is single-family residential housing. The Site is surrounded by off-site commercial and residential land-uses. Further, the Site itself may, in the future, be redeveloped for residential uses. Based on the current and potential future uses of the Site and the surrounding area, the populations that will be included in the health risk assessment are current off-site residential and commercial populations (living or working adjacent to the property) and future on-site residential populations. 4.3 Exposure Pathways The following section identifies the potentially complete exposure pathways through which current and future populations could be exposed to COPCs detected in soils and soil gas. The section also provides the rationale for excluding certain exposure pathways from further consideration. All exposure pathways included in the HRA are identified in Figure 3, the CSM for the Site. 4.3.1 Complete Exposure Pathways As previously indicated, complete exposure pathways require chemical sources, migration routes, an exposure point for contact, and human exposure routes. The Site is currently vacant and fenced, and the majority of the surface of the Site is unpaved. As indicated on Figure 3, and based on our review of available Site data and the current Site use and conditions, the complete pathways through which current off-site residents and commercial workers may be exposed to chemicals detected in soils and soil gas at the Site include the following: Current Off-site Resident and Commercial Worker

• Inhalation of volatiles migrating from soils and soil gas up through the soil column, and into outdoor ambient air; and

• Inhalation of particulates from exposed soils. In the future, it is possible that the Site could be redeveloped and direct exposure to the COPCs in the surface and subsurface soils could occur. As indicated on Figure 3, the complete pathways through which future hypothetical on-site residential populations may be exposed to chemicals detected at the Site include the following:



Future On-site Resident • Inhalation of volatiles migrating from soils and soil gas up through the soil column, and

into indoor and outdoor ambient air; • Inhalation of particulates; • Soil ingestion; and • Dermal contact with soils.

4.3.2 Incomplete Exposure Pathways Exposure pathways considered incomplete were not included in the risk evaluation. Exposure pathways considered incomplete are discussed below:

• Exposures related to the surface water runoff pathway: The Site is essentially flat and, as mentioned previously, mostly unpaved. Swales are in place over sections of the Site, but are in poor shape. Most precipitation will likely percolate into the soils, minimizing the potential for surface runoff. Thus, the surface water runoff pathway is considered incomplete under current conditions and is not evaluated in the HRA.

• Exposures related to the migration of constituents from the subsurface soils down into the

groundwater: Groundwater is not currently used at the Site as a potable drinking water source. As concluded in the RI report (Stantec, 2010), the low concentrations of petroleum hydrocarbons and related constituents detected in groundwater appear to be unrelated to historical site operations. Therefore, groundwater data collected during the RI was not evaluated in the HRA. Although migration of constituents from the subsurface soils down into the groundwater is currently considered incomplete based on existing Site data, the potential future migration of constituents from the subsurface soils down into the groundwater will be address in the FS/RAW.

4.4 Human Intake Assumptions The route-specific assumptions used to estimate exposure to the chemicals in the soils and soil gas at the Site are presented in Table 4. Exposure assumptions are taken from DTSC and USEPA guidance documents, wherever possible, and are cited in Table 4. As described in subsequent sections, the various exposure assumptions are combined to estimate the intake of a chemical through a given route of exposure (e.g., soil ingestion). The route-specific intakes are then combined in order to calculate the total intake, with all exposure pathways combined. The route-specific equations used to calculate chemical intake are presented in Tables 5 and 6, for the residential and commercial worker scenarios, respectively. 4.5 Estimation of Representative Exposure Concentrations The following section presents the methods used to estimate the representative concentration of the COPCs in the soils and air to which current and future populations could be exposed.



4.5.1 Estimation of COPC Concentrations in Soil As discussed by the USEPA (2002a), an estimate of the risk associated with a given exposure is based on an estimate of the average concentration from the sampling results. Typically, the 95% UCL of the arithmetic mean is used due to the uncertainty associated with estimating the true average concentration at a Site. An estimate of the average concentration is used because: 1) carcinogenic and chronic noncarcinogenic toxicity criteria are based on lifetime average exposures; and 2) the average concentration is most representative of the concentration that would be contacted over an extended exposure period (USEPA, 2002a) (i.e., exposure point concentration [EPC]). The 95% UCL values for each chemical were calculated using USEPA guidance (listed below) and the USEPA statistical program, ProUCL. Data for each chemical were analyzed to determine the distribution pattern (e.g., normal, lognormal, or gamma); printouts of ProUCL distribution analysis are included in Attachment C. As most chemical datasets did not fit a normal, lognormal, or gamma distribution pattern, nonparametric methods were used to calculate the 95% UCL. In instances where the 95% UCL is greater than the maximum detected concentration, the dataset was evaluated to determine whether the distribution of the dataset is highly skewed by an outlier, and either maximum detected concentration or more reasonable estimate of the average concentration was selected in place of the 95% UCL as the representative EPC. In accordance with USEPA guidance (USEPA, 2010a), 95% UCLs were not calculated for datasets with less than five detections or less than eight samples. Although the USEPA guidance (USEPA, 2010a) recommends either the use of the mean or the median when there are insufficient detections or number of samples in the dataset, the maximum detected concentration was conservatively used as the representative EPC in these cases in this HRA. The following documents were used for guidance in statistical analysis:

• U.S. Environmental Protection Agency (USEPA). 2002a. Calculating Upper Confidence Limits for Exposure Point Concentrations at Hazardous Waste Sites. Office of Emergency and Remedial Response. Washington, D.C. OSWER 9285.6-10. December.

• U.S. Environmental Protection Agency (USEPA). 2010b. ProUCL User Guide. Office of Research and Development. Washington, D.C. EPA/600/R-07/038. May.

The datasets used in estimating exposures to chemicals present in soils at the Site are summarized below: 4.5.1.1 Current Off-site Residents and Commercial Workers The Site is currently mostly unpaved. However, as the Site is unoccupied and enclosed by fencing topped with barbed wire, there is no current direct contact (i.e., soil ingestion or dermal contact) with soils at the Site. However, for current off-site residents and commercial workers, potential exposures associated with the inhalation of particulates in outdoor air from the exposed soils were assessed in this HRA, and are based on exposure to COPCs found within the upper 0.5



feet of exposed soils. The upper 0.5 feet of exposed soil is assumed to be representative of surface soils that have the potential for wind erosion and dispersion. 95% UCLs computed for COPCs from the exposed soils (0-0.5 feet bgs) dataset were used to assess the inhalation of particulates for current off-site residents and commercial workers. Soil samples collected within the adjacent street west of the Site (i.e. South Sacramento Street) are under either asphalt or concrete pavement and therefore, excluded from the exposed soil area dataset. Although there are some areas of the Site and LIW property that are paved, all 0 and 0.5 feet bgs soil samples collected within the Site and LIW property were considered uncovered and included in the exposed soil area dataset. Summary statistics for this dataset are provided in Table 1. The concentrations of chemicals in exposed soils that were used as the representative EPC for evaluating particulate inhalation exposures to current off-site residents and commercial workers are presented in Table 7.

4.5.1.2 Future On-site Residents Under a future residential scenario, the subsurface soils down to 10 feet bgs could potentially be brought up and mixed with surface soils as a result of Site development. Future on-site residents are therefore assumed to be directly exposed to COPCs detected across the Site down to a depth of 10 feet bgs. 95% UCLs computed for COPCs from the soils (0-10 feet bgs) dataset were used to assess exposures to the future on-site residents. Summary statistics for this dataset are presented in Table 2. The concentrations of chemicals in soils that were used as the representative EPC for evaluating potential exposures to future on-site residents are presented in Table 8. 4.5.2 Estimation of Air Concentrations Resulting from Emissions from Soil 4.5.2.1 Volatile Organic Compounds Indoor Air Volatile compounds have the potential to volatilize from soils into soil gas, and migrate up through the soil column and into the indoor air space of an overlying building. This process is referred to as “vapor intrusion.” Future building occupants on-site could then be exposed via inhalation to these volatile compounds present in indoor air. The COPCs considered to be volatile are those COPCs that have a Henry’s Law constant greater than 10-5 (atm-m3/mol) and a vapor pressure greater than 10-3 mm Hg (Cal/EPA, 1994). Physicochemical properties of the COPCs in soils and soil gas are presented in Table 9. In general, soil gas data, rather than soil data, are preferred for use in transport modeling of volatile chemicals to indoor air, because soil gas data represent a direct measurement of the gas-phase constituents that may migrate to indoor air. Thus, soil gas data was used to evaluate the vapor intrusion pathway. The chemicals detected in soil gas at the Site include 1,1-difluoroethane, 1,2,4-trimethylbenzene, 1,3,5-trimethylbenzene, 2-butanone (MEK), 2-hexanone,



4-ethyltoluene, acetone, benzene, carbon disulfide, isopropylbenzene (cumene), ethanol, dichlorodifluoromethane (Freon 12), ethylbenzene, heptane, methyl tert-butyl ether (MTBE), naphthalene, propylbenzene, styrene, tetrachloroethene, toluene, trichlorofluoromethane (Freon 11), trichloroethene, and total xylenes. As previously mentioned, soil gas data were collected from 6 locations (i.e. SG-1 through SG-6) across the Site at two depths (i.e. 5 feet bgs and 8 feet bgs) to evaluate the significance of the vapor intrusion pathway. There are currently no on-site buildings, and the site is unoccupied thus there the vapor intrusion pathway is considered incomplete under current site conditions. However, under the hypothetical future residential land use scenario, residential buildings could be built anywhere on-site. As described in detail in Attachment D, potential vapor intrusion into future on-site buildings is modeled with the USEPA-recommended Johnson & Ettinger Model for soil gas (SG-SCREEN Version 2.0), as modified by the Cal/EPA DTSC HERD (USEPA, 2004a; Cal/EPA, 2009c). The vapor intrusion modeling is conducted using the soil gas data collected at all locations throughout the Site. In summary, the vapor intrusion pathway is evaluated for hypothetical future on-site residents. The details of the fate and transport modeling used to estimate concentrations of volatile chemicals in indoor air are presented in Attachment D. The results of the transport modeling are presented in Table 23 for future on-site residential populations; this table presents the modeled chemical concentrations in indoor air associated with each measured chemical concentration in soil gas. The results of the soil gas evaluation are discussed in further detail in Section 6.0, Risk Characterization. Ambient Air

The CSM (Figure 3) assumes that all receptor populations included in the HRA could be exposed to volatile chemicals present in outdoor air as a result of transport from either soils or groundwater. Exposure to volatile constituents present in outdoor air could occur via the inhalation pathway. In general, soil gas data, rather than soil or groundwater data, are preferred for use in transport modeling of volatile chemicals to outdoor air, because soil gas data represent a direct measurement of the gas-phase constituents that may migrate to outdoor air. Thus, soil gas data were used to evaluate the outdoor air pathway.

As discussed in Attachment D, transport from soil gas to outdoor air is modeled by assuming steady-state emissions in accordance with ASTM guidance (ASTM, 1995) and a dispersion factor estimated in accordance with the USEPA Soil Screening Guidance (USEPA, 1996; 2002b). This transport process is characterized by the “transfer factor” (TF), which is defined as the volatile chemical concentration in on-site outdoor air (CA) divided by the volatile chemical concentration in soil gas (CSG). Thus, the concentration of a volatile-phase chemical in outdoor air may be expressed as a function of the chemical concentration in soil gas and the TF:

( ) ( ) TFmg/mCSG mg/mCA 33 ×=



Chemical- and depth-specific TFs are developed as described in Attachment D, and are applied to the results of soil gas sampling at locations SG-1 through SG-6. The results of this transport modeling from soil gas to outdoor air are presented in Tables 21 and 22 for residents and commercial workers, respectively; these tables present the modeled chemical concentration in on-site outdoor air associated with each measured chemical concentration in soil gas.

The CSM assumes that, under the current land use scenario, volatile chemicals emitted from soil gas to on-site outdoor air are further transported via advection (i.e., wind) to off-site residential and commercial land uses, where off-site residential and commercial receptors are exposed via inhalation. It is conservatively assumed that these off-site residential and commercial receptors are exposed to volatile chemicals at their estimated concentrations in on-site outdoor air. In actuality, the concentrations of volatile chemicals in outdoor air would likely be lower at off-site locations than on-site, due to dispersion. 4.5.2.2 Nonvolatile Chemicals

The CSM assumes that all receptor populations included in the health risk assessment could be exposed to particulate-phase chemicals present in outdoor air as a result of transport from Site soils (i.e., chemicals adhered to airborne dust particles). In general, the concentration of a particulate-phase chemical in air (CA) is the product of the concentration of dust in air (CD) and the concentration of the chemical in soils (CS):

Thus, for a given concentration of a chemical in soils (CS), a determination of the concentration of that chemical in air (CA) requires a determination of the dust concentration in air (CD). In the context of modeling chemical transport from soils to outdoor air, the concentration of dust in air is expressed through the particulate emission factor (PEF). As defined by the USEPA Soil Screening Guidance (USEPA, 1996: 2002b), the PEF has units of cubic meters of air per kilogram of dust (m3/kg), and is therefore equal to the reciprocal of the dust concentration:

( ) ( ) ( )mg/kg 10mg/m CD1/kgm PEF 6

33 +×=

Combining the preceding two equations, the concentration of a particulate-phase chemical in outdoor air may be expressed as a function of the chemical concentration in soils and the particulate emission factor (PEF):

( ) ( )( )/kgmPEFmg/kg CSmg/mCA 3

3 =

The chemical concentration in soils (CS) used to estimate the chemical concentration in air (CA) for a particular receptor is the EPC in soils for that receptor.

( ) ( ) ( ) ( )kg/mg 01mg/kg CSmg/m CDmg/mCA 633 −××=



For residential and commercial receptor populations, the dust concentration in air is assumed to be attributable to wind erosion. Wind erosion is modeled in accordance with the PEF methodology presented in the USEPA Soil Screening Guidance (USEPA, 1996: 2002b). The details of this calculation are described in Attachment D. Calculated PEFs and particulate-phase chemical concentrations in outdoor air are presented in Table 7 for current off-site residents and commercial workers and Table 8 for future on-site residents.

Similar to the approach for exposure to VOCs in outdoor air, it is conservatively assumed that off-site commercial and residential receptors are exposed to chemicals in particulate-phase at their estimated concentrations in on-site outdoor air. In actuality, the concentrations of particulate-phase chemicals in outdoor air would likely be lower at off-site locations than on-site, due to dispersion.



5.0 TOXICITY ASSESSMENT The toxicity assessment characterizes the relationship between the magnitude of exposure to a chemical and the potential for adverse health effects. More specifically, the toxicity assessment identifies or derives toxicity values that can be used to estimate the likelihood of adverse health effects occurring in humans at different exposure levels. Consistent with regulatory risk assessment policy, adverse health effects resulting from chemical exposures are evaluated in two categories: carcinogenic effects and noncarcinogenic effects. The hierarchy of sources for the toxicity criteria used for this HRA corresponds to the State's guidelines (Cal/EPA, 1994). All toxicity values used in the HRA are presented in Table 10. For evaluating lead exposures, the traditional RfD approach is not applied, because most human health effects data are based on blood lead concentrations, rather than external dose (Cal/EPA, 1993). 5.1 Toxicity Assessment for Carcinogenic Effects Current health risk assessment practice for carcinogens is based on the assumption that, for most substances, there is no threshold dose below which carcinogenic effects do not occur. This current “no-threshold” assumption for carcinogenic effects is based on an assumption that the carcinogenic processes are the same at high and low doses. This approach has generally been adopted by regulatory agencies as a conservative practice to protect public health, and the “no-threshold” assumption has been used in the agency-derived cancer slope factors (CSFs) and Unit Risk Factors (URFs) used in this HRA. Although the magnitude of the risk declines with decreasing exposure, the risk is believed to be zero only at zero exposure. The toxicity values used to quantify the response potency of a potential carcinogen are the following:

• The CSF, used in assessing the oral route of exposure, represents the excess lifetime cancer risk due to a continuous, constant lifetime exposure to a specified level of a carcinogen generally reported as excess incremental cancer risk per milligram of chemical per kilogram body weight per day (mg/kg-day)-1.

• The URF, used to assess the inhalation route of exposure, represents the excess lifetime

cancer risk due to a continuous, constant lifetime exposure to a specified level of a carcinogen in the air, generally reported as excess incremental cancer risk per microgram of chemical per cubic meter of air (ug/m3)-1; URFs are reported as excess incremental cancer risk per milligram of chemical per cubic meter of air [(mg/m3)-1] in Table 10 for risk calculation purposes.

The Cal/EPA and USEPA have published a list of CSFs and URFs recommended for use in risk assessments. In accordance with DTSC guidance (Cal/EPA, 1994), the hierarchy of toxicity values for carcinogenic effects used in this HRA is as follows:



1. The Cal/EPA-recommended CSFs and URFs as maintained on the Cal/EPA Office of Environmental Health Hazard Assessment’s (OEHHA) on-line toxicity criteria database (Cal/EPA, 2011).

2. The National Center of Environmental Assessment (NCEA)/Superfund Health Risk

Technical Support Center (STSC)-recommended provisional peer reviewed toxicity values (PPRTVs; as cited in USEPA, 2010c or USEPA 2004b).

Table 10 presents the CSFs and URFs used in this HRA. As indicated, chemicals detected in soils and/or soil gas at the Site that are currently regulated as carcinogens include benzene, ethylbenzene, MTBE, 1-methylnaphthalene, naphthalene, tetrachloroethene, trichloroethene, benzo(a)pyrene equivalents, beryllium, cadmium, cobalt, and nickel. 5.2 Toxicity Assessment for Noncarcinogenic Effects The toxicity assessment for noncarcinogenic effects requires the estimation of an exposure level below which no adverse health effects in humans are expected to occur. USEPA refers to these levels as reference doses (RfDs) for oral exposures and reference concentrations (RfCs) for inhalation exposures (USEPA, 1989a). The noncancer RfD represents a dose, given in milligrams of chemical per kilogram of body weight per day (mg/kg/day), that would not be expected to cause adverse noncancer health effects in potentially exposed populations. The noncancer RfD is often referred to as the “acceptable dose.” The noncancer RfC represents the airborne concentration (in units of milligrams per cubic meter [mg/m3]) that would not be expected to cause adverse noncancer health effects in populations exposed through the inhalation pathway. OEHHA refers to these “acceptable air concentrations” as Reference Exposure Levels (RELs). As the inhalation RfCs/RELs are derived from inhalation toxicity studies, they are used for evaluating inhalation exposures (USEPA, 1989a). Noncancer toxicity values used (i.e., RfDs and RfCs) correspond to those listed and recommended by Cal/EPA and USEPA. Consistent with DTSC HERO’s approach (Cal/EPA, 2009c), the more conservative RfD/REL and RfC/REL obtained from either OEHHA’s list of chronic RELs (Cal/EPA, 2011) or USEPA’s sources listed below are used in this HRA (e.g., RfC for naphthalene). As recommended by USEPA (USEPA, 2003a), the hierarchy of USEPA toxicity values for noncancinogenic effects for the oral and inhalation exposures (i.e., RfDs and RfCs, respectively) used in this HRA is as follows:

1. The USEPA-recommended RfDs as maintained on the USEPA’s IRIS on-line database (USEPA, 2011);

2. The NCEA/STSC-recommended PPRTVs (as cited in USEPA, 2010c or USEPA

2004b); and

3. Other USEPA-recommended values (i.e., HEAST toxicity values; USEPA, 1997).



All noncarcinogenic toxicity values used in this risk assessment for chemicals detected in soils and/or soil gas at the Site are presented in Table 10. 5.3 Toxicity Assessment for Lead The traditional RfD approach to the evaluation of chemicals is not applied to lead because most human health effects data are based on blood lead concentrations, rather than external dose (Cal/EPA, 1993). Blood lead concentration is an integrated measure of internal dose, reflecting total exposure from Site-related and background sources. A clear “no observed effects level” (NOEL) has not been established for such lead-related health effects endpoints such as birth weight, gestation period, heme synthesis and neurobehavioral development in children and fetuses, and blood pressure in middle-aged men. The California Office of Environmental Health Hazard Assessment (OEHHA) has developed a 1 µg/dL benchmark for source-specific incremental change in blood lead levels for protection of school children and fetuses (OEHHA, 2007). The DTSC has developed a methodology for evaluating exposure and the potential for adverse health effects resulting from exposure to lead in the environment (Cal/EPA, 1993). The methodology presents an algorithm for estimating blood lead concentrations in children and adults based on a multi-pathway analysis. DTSC has provided a spreadsheet (LeadSpread) based on its guidance for evaluating lead toxicity (Cal/EPA, 1993). The USEPA has developed a methodology for evaluating exposure and the potential for adverse health effects resulting from nonresidential exposure to lead in the environment, in Recommendations of the Technical Review Workgroup for Lead for an Approach to Assessing Risks Associated with Adult Exposures to Lead in Soil (TRW ALM; USEPA, 2003b). The methodology results in a blood lead concentration of concern for the protection of fetal health (in women of child-bearing age) and presents an algorithm for predicting quasi-steady state blood lead concentrations among adults who have relatively steady patterns of site exposure. The DTSC’s LeadSpread Model was used in this HRA to estimate the incremental increase in blood lead (PbB) in the child exposed to lead in soil (i.e., the blood lead concentration at the 90th percentile using LeadSpread) under the current off-site and future on-site residential scenario. The incremental increase in blood lead for both receptors will be compared to OEHHA’s recommended benchmark change in blood lead concentration of 1 µg/dL (OEHHA, 2007). As the USEPA’s ALM only considers the soil ingestion pathway, health risks associated with lead in on-site soils for the current off-site commercial worker will be assessed relative to health risks estimated for the current off-site resident as health risks from exposure to lead in on-site soils for the current off-site commercial worker will be lower than that for the current off-site resident given the lower exposure frequency (i.e. 5 days per week for the commercial worker versus 7 days per week for the resident). The results of the lead evaluation for the Site for current off-site residents and commercial worker and future on-site residents are discussed in Section 6.0 (Risk Characterization).



6.0 RISK CHARACTERIZATION This section of the HRA presents the quantitative characterization of risks posed by the COPCs identified in soils and soil gas, and the uncertainties associated with the projected risks. This section is divided into three parts. The first part discusses the methodology used in calculating potential health risks to exposed populations posed by the presence of chemicals in the soils and soil gas. The second part presents the estimated cumulative potential incremental cancer risk and noncancer hazard posed by the presence of COPCs in soils and soil gas. The quantitative estimates of incremental cancer risk and noncancer hazard provide the basis for identifying the types of mitigation measures that may be appropriate, if needed, to reduce risks to levels that would be fully protective of human health and the environment. A detailed discussion of uncertainties associated with the HRA is presented in Attachment E. The third and final part of this section presents the summary and conclusions of the risk characterization. 6.1 Methodology Estimating incremental cancer risks and noncancer hazard indices for exposures to chemicals in soils and soil gas requires information regarding chemical concentrations in the various media, the level of intake of the chemical, and the relationship between intake of the chemical and its toxicity as a function of human exposure to the chemical. The methodology used to derive the incremental cancer risks and noncancer hazard indices for the selected chemicals of concern is based principally on guidance provided in the regulatory documents listed below.

• U.S. Environmental Protection Agency (USEPA). 1989a. Risk Assessment Guidance for Superfund. Volume I: Human Health Evaluation Manual (Part A). Interim Final. Office of Emergency and Remedial Response. EPA/540/1-89/002. Washington, D.C. December.

• U.S. Environmental Protection Agency (USEPA). 1991. Risk Assessment Guidance for

Superfund. Volume I: Human Health Evaluation Manual. Supplemental Guidance. Standard Default Exposure Factors. Office of Emergency and Remedial Response. March 25.

• California Environmental Protection Agency (Cal/EPA). 1994. Preliminary

Endangerment Assessment Manual. Department of Toxic Substances Control (DTSC). January (Second Printing June 1999).

• California Environmental Protection Agency (Cal/EPA). 2005. DTSC/HERD Human

Health Risk Assessment (HHRA) Note Number 1. Department of Toxic Substances Control. October 27.

The sections below present the equations used to derive the incremental cancer risks and noncancer hazard indices for the selected COPCs.



6.1.1 Carcinogenic Health Effects The equations below describe the established relationship between estimated intake, toxicity, and risk for carcinogenic health effects. For exposures occurring via soil ingestion and dermal contact pathways, the relationship for carcinogenic effects is given by the following equation (USEPA, 1989a): Cancer Risk = CDI x CSF Where:

Cancer Risk = Cancer risk; the incremental probability of an individual developing cancer as a result of exposure to a particular cumulative dose of a potential carcinogen (unitless);

CDI = Chronic Daily Intake of a chemical (mg chemical/kg body weight-day);

CSF = Cancer Slope Factor; the toxicity value which indicates the upper limit on lifetime incremental cancer risk per unit of dose of chemical (mg chemical/kg body weight-day)-1.

For the inhalation pathway, the relationship for carcinogenic effects is given by the following equation (USEPA, 2009): Cancer Risk = EC x URF Where:

Cancer Risk = Cancer risk; the incremental probability of an individual developing cancer as a result of exposure to a particular cumulative concentration of a potential carcinogen (unitless);

EC = Exposure Concentration of a chemical (mg chemical/m3 air); URF = Unit Risk Factor; the toxicity value which indicates the upper limit

on lifetime incremental cancer risk per unit of concentration of chemical (mg chemical/m3 air)-1.

The formulas for developing the CDIs and ECs used in this evaluation are presented in Tables 5 and 6 for residential and commercial worker populations, respectively. The calculated ECs for the current off-site commercial and residential scenarios for the inhalation of particulates associated with exposed soils are summarized in Table 11 for carcinogenic chemicals. CDIs and ECs for the future on-site residential scenario for exposure to carcinogenic chemicals in on-site soils are summarized in Table 13. Estimated incremental cancer risks associated with exposure to carcinogenic chemicals in on-site soils for exposure scenarios evaluated in this HRA are presented in the following tables:

• Table 15: current off-site residential and commercial scenarios, and • Table 18: future on-site residential scenario.



Estimated incremental cancer risks associated with exposure to carcinogenic VOCs in soil gas via inhalation of vapors in indoor and outdoor air for exposure scenarios evaluated in this HRA are presented in the following tables:

• Table 21: current off-site and future on-site residential scenarios, outdoor air risks; • Table 22: current off-site commercial scenario, outdoor air risks; and • Table 23: future on-site residential scenario, indoor air (vapor intrusion) risks.

As a point of reference, we note that the National Contingency Plan (NCP) (40 CFR 300) indicates that lifetime incremental cancer risks posed by a site should not exceed a range of one in one million (1 x 10-6) to one hundred in a million (1 x 10-4). Cal/EPA’s point of departure for excess incremental lifetime cancer risk for all receptor groups (i.e., residential and commercial populations) is 1 x 10-6 and risk management decisions may raise this criterion dependent on site specific conditions. For instance, the “target” cancer risk typically used by Cal/EPA and USEPA in determining the need for mitigation is 1 x 10-5 for commercial populations on commercial sites. 6.1.2 Noncarcinogenic Health Effects The relationship for the ingestion and dermal contact pathways for a noncarcinogenic chemical is given by the following equation (USEPA, 1989a):

Hazard Quotient = CDI/RfD Hazard Index = ∑ Hazard Quotient

Where:

Hazard Quotient = Hazard Quotient; an expression of the potential for a chemical to cause noncarcinogenic effects, which relates the allowable amount of a chemical (RfD) to the estimated Site-specific intake (unitless);

Hazard Index = Hazard Index; the sum of the chemical-specific Hazard Quotients, which represents the cumulative potential for predicted exposures to result in noncarcinogenic effects (unitless);

CDI = Chronic Daily Intake of a chemical (mg chemical/kg body weight-day);

RfD = Reference dose; the toxicity value indicating the threshold amount of chemical contacted below which no adverse health effects are expected (mg chemical/kg body weight-day).

For a noncarcinogenic chemical, the relationship for the inhalation pathway is given by the following equation (USEPA, 2009):

Hazard Quotient = EC/RfC Hazard Index = ∑ Hazard Quotient



Where:

Hazard Quotient = Hazard Quotient (HQ); an expression of the potential for a chemical to cause noncarcinogenic effects, which relates the allowable concentration of a chemical (reference concentration [RfC]) to the estimated site-specific exposure concentration (unitless);

Hazard Index = Hazard Index (HI); the sum of the chemical-specific Hazard Quotients, which represents the cumulative potential for predicted exposures to result in noncarcinogenic effects (unitless);

EC = Exposure Concentration of a chemical (mg chemical/m3 air); RfC = Reference concentration; the toxicity value indicating the

threshold concentration of chemical contacted below which no adverse health effects are expected (mg chemical/m3 air).

The formulas for developing the CDIs and ECs used in this evaluation are presented in Tables 5 and 6 for residential populations and for commercial worker populations, respectively. The calculated ECs for the current off-site commercial and residential scenarios for the inhalation of particulates associated with noncarcinogenic chemicals in the exposed soils are summarized in Table 12. CDIs and ECs for the future on-site residential scenario for exposure to noncarcinogenic chemicals in on-site soils are summarized in Table 14. Estimated noncancer hazard indices associated with exposure to noncarcinogenic chemicals in on-site soils for exposure scenarios evaluated in this HRA are presented in the following tables:

• Table 16: current off-site residential and commercial scenarios, and • Table 19: future on-site residential scenario.

Estimated noncancer hazard indices associated with exposure to noncarcinogenic VOCs in soil gas via inhalation of vapors in indoor and outdoor air exposure scenarios evaluated in this HRA are presented in the following tables: :

• Table 21: current off-site and future on-site residential scenario, outdoor air hazard indices;

• Table 22: current off-site commercial scenario, outdoor air hazard indices; and • Table 23: future on-site residential scenario, indoor air (vapor intrusion) hazard indices.

For noncancer health effects, an HI of less than or equal to 1 implies that the intake for a given population and chemical is less than or equal to levels where adverse noncancer health effects could occur. For noncancer health hazards, an HI of 1 is identified as the target level of concern. Chemical exposures that yield hazard indices of less than 1 are not expected to result in adverse noncancer health effects (USEPA, 1989a).



6.2 Results of Cancer Risk and Noncancer Hazard Assessment This section presents the results of the incremental cancer risk and noncancer hazard estimates for exposures to COPCs in on-site soils and soil gas under current and future land-use scenarios. The current land-use scenarios include the current off-site residential and commercial scenarios. The future land-use scenario includes a future on-site residential scenario. As previously indicated, the incremental cancer risks and noncancer hazards estimated associated with exposure to COPCs in on-site soils under the exposure scenarios evaluated in this HRA are presented in Tables 15, 16, 18, and 19. The incremental cancer risks and noncancer hazards estimated associated with exposure to COPCs in soil gas under the exposure scenarios evaluated in this HRA are presented in Tables 21 through 23. Also, the estimated blood lead levels for current off-site and future on-site residential populations are presented in Tables 17 and 20, respectively. 6.2.1 Current Land-Use Scenario Off-site Resident The estimated incremental cancer risks and noncancer HIs for current off-site residential populations posed by the presence of COPCs in exposed soils and VOCs in soil gas are summarized in the following table:

Media Off-site Resident Cancer Risk Noncancer HI

Exposed Soils 8.4E-08 0.0094 (Child)

Soil Gas 1.9E-09 (Average)

0.00014 (Average)

Cumulative 8.6E-08 0.0095 As indicated in Table 15, the estimated total incremental cancer risk from the inhalation of COPCs in exposed soils for current off-site residents is 8.4 x 10-8, which is well below the acceptable risk range of 1 x 10-6 to 1 x 10-4. Approximately 55% of the estimated total incremental cancer risk for current off-site residents is attributable to nickel in exposed soils, with cobalt and CPAH contributing approximately 22% and 21% to the estimated total incremental cancer risk, respectively. As indicated in Table 16, the estimated total noncancer hazard from the inhalation of COPCs in exposed soils for current off-site residents is 0.0094, which is well below the acceptable HI of 1. Approximately 89% of the estimated total noncancer HI for current off-site residents is attributable to nickel, and 8% is attributable to cobalt. As shown in Table 21, the estimated average incremental cancer risk and noncancer hazard from VOCs in outdoor air for current off-site residents are 1.9 x 10-9 and 0.00014, respectively, which are both well below the acceptable risk and HI levels.



In sum, estimated cumulative incremental cancer risks and noncancer HIs for the current off-site resident from the inhalation of soil particulates and VOCs in outdoor air are 8.6 x 10-8 and 0.0095, respectively. The estimated cumulative incremental cancer risk is well below the acceptable range of 1 x 10-6 to 1 x 10-4, and the estimated cumulative noncancer HI is well below the acceptable HI of 1. Table 17 presents the output from LEADSPREAD for current off-site residents exposed via the inhalation of particulates. As indicated in Table 17, the 95% UCL of lead detected in exposed soils (1,291 mg/kg) results in an incremental increase in PbB in the child of 0.0046 µg/dL (at the 90th percentile), which is below the OEHHA’s recommended benchmark change in blood lead concentration of 1 µg/dL (OEHHA 2007). Accordingly, the lead concentrations in exposed soils would not pose a significant risk to current off-site residents, and would not result in a significant increase in blood-lead levels. Off-site Commercial Worker The estimated incremental cancer risks and noncancer HIs for current off-site commercial populations posed by the presence of COPCs in exposed soils and VOCs in soil gas are summarized in the following table:

Media Off-site Commercial Worker Cancer Risk Noncancer HI

Exposed Soils 1.7E-08 0.0022

Soil Gas 3.7E-10 (Average)

0.000034 (Average)

Cumulative 1.7E-08 0.0022 As indicated in Table 15, the estimated total incremental cancer risk from the inhalation of COPCs in exposed soils for current off-site commercial workers is 1.7 x 10-8, which is well below the acceptable risk range of 1 x 10-6 to 1 x 10-4. Approximately 55% of the estimated total incremental cancer risk for current off-site commercial workers is attributable to nickel in exposed soils, with cobalt and CPAH contributing approximately 22% and 21%, respectively. As indicated in Table 16, the estimated total noncancer hazard from the inhalation of COPCs in exposed soils for current off-site commercial workers is 0.0022, which is well below the acceptable HI of 1. Approximately 89% of the estimated total noncancer HI for the current off-site commercial worker is attributable to nickel, with cobalt contributing approximately 8%. Estimated average incremental cancer risks and noncancer HIs from VOCs in outdoor air for the current off-site commercial worker, as shown in Table 22, are 3.7 x 10-10 and 0.000034, respectively, which are both well below acceptable risk and HI levels. In sum, the estimated cumulative incremental cancer risk and noncancer HI from the inhalation of soil particulates and VOCs in outdoor air for the current off-site commercial worker are 1.7 x 10-8 and 0.0022, respectively. The estimated cumulative incremental cancer risks is well below



the acceptable risk range of 1 x 10-6 to 1 x 10-4, and the estimated cumulative noncancer HIs are well below the acceptable HI of 1. The USEPA lead uptake model for non-residential exposures is mainly based on the soil ingestion pathway. As current off-site commercial workers are assumed to be only exposed via the inhalation of particulates, the predicted incremental increase in blood lead concentrations for the off-site commercial worker and the fetus of the offsite commercial worker would be lower than that predicted for the off-site resident due to the lower exposure frequency. As the predicted incremental increase in blood lead concentration for the off-site child resident is predicted to be below the OEHHA’s recommended benchmark change in blood lead concentration of 1 µg/dL (OEHHA, 2007), we can conclude that lead exposures to current off-site commercial workers would also result in a predicted incremental increase in blood lead concentration below the OEHHA’s recommended. 6.2.2 Future Land-Use Scenario On-site Resident The estimated incremental cancer risks and noncancer HIs for the future on-site residential population posed by the presence of COPCs in on-site soils and in soil gas are summarized in the following table:

Media Cancer Risk Noncancer HI On-site Soils 6.7E-03 4.8 (Child) Soil Gas 1.3E-06 (Maximum) 0.074 (Maximum) Cumulative 6.7E-03 (Maximum) 4.8 (Maximum)

As indicated in Table 18, the estimated total incremental cancer risk from soils for the future on-site resident is 6.7 x 10-3, which is above the acceptable risk range of 1 x 10-6 to 1 x 10-4. Approximately 97%, 2.6%, and 0.2% of the estimated total incremental cancer risk is attributable to CPAHs (expressed as benzo(a)pyrene equivalents, 6.5 x 10-3), naphthalene (1.7 x 10-4), and benzene (1.5 x 10-6), respectively. Approximately 67% of the estimated total incremental cancer risk is attributable to the ingestion pathway and 33% to the dermal contact pathway. As indicated in Table 19, the estimated total noncancer HIs for the future on-site resident child and adult are 4.8 and 0.55, respectively, which are above and below, respectively, the acceptable HI of 1. Approximately 32%, 12%, 8%, 7%, 6%, and 6% of the cumulative HI for the future on-site resident child is attributable to thallium (1.6), naphthalene (0.56), pyrene (0.39), cobalt (0.35), benzene (0.29), and fluoranthene (0.28), respectively. Approximately 83% of the estimated total HI from soils for the future on-site resident child is attributable to the ingestion pathway, and approximately 17% is attributable to the dermal pathway. Note, that there are uncertainties associated with the toxicity value (i.e., RfD recently withdrawn by USEPA from the IRIS database) used to estimate the hazard associated with exposure to thallium in soils. Further, thallium was detected in only 1 out of 243 samples at a concentration of 7.8 mg/kg. Due to the limited number of detections, the detected concentration of 7.8 mg/kg



was used as the EPC. The EPC is 18-times higher than the mean concentration for thallium. Therefore, the potential exposure to thallium in on-site soils and associated noncancer HI for thallium (i.e. 1.6) are believed to be overestimated in this HRA and the actual noncancer HI is likely below 1. As shown in Table 23, estimated maximum incremental cancer risks for the future on-site resident from the vapor intrusion pathway range from 2.1 x 10-8 (from location SG-6 at 8 feet bgs) to 1.3 x 10-6 (from location SG-2 at 8 feet bgs), where naphthalene 2 (7.4 x 10-7; 55%), ethylbenzene (4.1 x 10-7; 31%), and benzene 3 (1.3 x 10-7; 10%) are the main drivers of cancer risk. Estimated maximum incremental cancer risks for the future on-site resident from the vapor intrusion pathway are below or equivalent to the lower end of the acceptable risk range of 1 x 10-

6 to 1 x 10-4. Note that the highest levels of benzene and/or naphthalene in on-site soils were detected at boring locations SB-6 and SB-49. The closest soil gas location to SB-6 is SG-2; approximately 40 feet northeast of SB-6. The closest soil gas location to SB-49 is SG-5; approximately 40 feet southwest of SB-49. As there are no soil gas data collected in close proximity to SB-6 and SB-49, future potential vapor intrusion risks presented in this HRA may be underestimated for certain areas of the Site. These locations with elevated levels of benzene and/or naphthalene in on-site soils will be address in the FS/RAW. Estimated maximum noncancer HIs for the future on-site resident from vapor intrusion range from 0.0018 (from location SG-6 at 8 feet bgs) to 0.074 (from location SG-2 at 8 feet bgs), with total xylenes (0.021; 29%), naphthalene (0.017; 23%), toluene (0.017; 22%), and 1,2,4-trimethylbenzene (0.011; 14%) as the main contributors to the noncancer hazard. Estimated maximum incremental hazards for the future on-site resident from the vapor intrusion pathway are below the acceptable HI of 1. As shown in Table 21, the estimated average incremental cancer risk and noncancer hazard from VOCs in outdoor air for future on-site residents are 1.9 x 10-9 and 0.00014, respectively, which are both well below the acceptable risk and HI levels. In sum, the estimated maximum cumulative incremental cancer risk from soils and soil gas for the future on-site resident is 6.7 x 10-3, which is above the acceptable risk range of 1 x 10-6 to 1 x 10-4 and attributed primarily to direct exposure to COPCs in on-site soils. The estimated maximum cumulative noncancer HI for the future on-site resident child is 4.8, which is above the acceptable HI of 1 and also attributed primarily to direct exposure to COPCs in on-site soils. As indicated in Table 20, the 95% UCL of lead detected in exposed soils (631 mg/kg) results in an incremental increase in PbB in the child of 8.2 µg/dL (at the 90th percentile), which is above 2 Naphthalene was not detected above analytical reporting limit (RL) in sample collected from location SG-2 at 8 feet bgs. However, naphthalene was conservatively assumed to be presence at one-half the RL for the estimate of vapor intrusion risk. 3 Benzene was not detected above analytical RL in sample collected from location SG-2 at 8 feet bgs. However, benzene was conservatively assumed to be presence at one-half the RL for the estimate of vapor intrusion risk.



the OEHHA’s recommended benchmark change in blood lead concentration of 1 µg/dL (OEHHA 2007). Therefore, the concentrations of lead in on-site soils may result in an increase in the blood lead level for the future on-site resident of more than 1 ug/dL. 6.2.3 Uncertainties in Risk Characterization The risk assessment includes several uncertainties that warrant discussion. Many of the assumptions used in this risk assessment, regarding the representativeness of the sampling data, human exposures, fate and transport modeling, and chemical toxicity are conservative, following agency guidance, and reflect a 90th or 95th percentile value, rather than a typical or average value. The use of several conservative exposure and toxicity assumptions can introduce considerable uncertainty into the risk assessment. By using conservative exposure or toxicity estimates, the assessment can develop a significant conservative bias that may result in the calculation of significantly higher cancer risks or noncancer hazards than are actually posed by the chemicals present in soils and soil gas. A discussion of the key uncertainties used in this evaluation for the Site is discussed in Attachment E. 6.3 Summary and Conclusions An HRA was conducted to evaluate potential risks to current and/or future populations that could be exposed to Site-related chemicals at the Site. As the Site is currently vacant and fenced, the scope of the HRA focuses primarily on evaluations associated with the potential future unrestricted use of the Site for hypothetical residential purposes. The results of the HRA will be used to will be used to identify areas of the Site where remediation, or other forms of risk management, may be appropriate, with the overall goal of long-term protection of human health and the environment. The HRA was intended to be conservative, resulting in projected estimates of health risks that are likely higher than the actual risks that may be posed by the Site. The human receptors that could potentially be impacted through use of the Site were identified and included in the evaluation. All chemicals detected in Site soil sampling activities were included in the evaluation under the assumption that the 95% UCL represents the exposure point concentration to which human populations may be exposed. All VOCs detected in soil gas collected during the RI sampling activities were included in the evaluation and the maximum detected concentration at each sampled depth of each soil gas location was used to estimate the concentrations representative of ambient and indoor air exposure point concentrations to which human populations may be exposed. The quantitative risk results and corresponding conclusions for each of the land use scenarios is summarized below. Current Offsite Residential and Commercial Scenarios HRA results indicate that none of the chemicals detected in exposed surface soils and soil gas at the Site pose a significant health risk to current off-site residential and commercial populations. Estimated incremental cancer risks and noncancer HIs for these populations are well below 1 x 10-6 and 1, respectively. Further, levels of lead in exposed soils at the Site are not expected to result in an increase in blood lead levels above OEHHA’s benchmark value of 1 ug/dL for current off-site residential and commercial populations. Based on these conservative upper-



bound risk estimates, remedial action, or other form of risk management, is not necessary to protect the health of current off-site residential and commercial populations. Future Onsite Residential Scenario This HRA also evaluates potential health risks to future on-site residential populations. In the future, it is possible that the Site could be redeveloped for residential purposes and buildings could be constructed anywhere on the Site. The results of this HRA indicate that the estimated incremental cancer risks and noncancer hazards associated with COPCs in soil gas via vapor intrusion for future on-site residential populations are below or at acceptable levels (i.e., incremental cancer risks are below or equivalent to the lower end of the acceptable risk range of 1 x 10-6 to 1 x 10-4 and the noncancer HIs are below 1). We note, however, the estimated incremental cancer risks for the future on-site residential population are based on existing soil gas data collected during the RI. Soil sampling results have indicated areas of elevated benzene and/or naphthalene concentrations in on-site soils (i.e., at SB-6 and SB-49) where no soil gas data was collected. These areas will be addressed in the FS/RAW. The estimated incremental cancer risks associated with COPCs in soils for the future on-site residential population are above the acceptable risk range of 1 x 10-6 to 1 x 10-4, due principally to the presence of CPAHs, naphthalene, and benzene in soils. The estimated noncancer hazards for the future on-site residential populations are also above the acceptable HI of 1, due primarily to naphthalene, pyrene, cobalt, benzene, and fluoranthene in soils. Further, the levels of lead in soils at the Site could result in an increase in blood lead levels above OEHHA’s benchmark value of 1 ug/dL for residential populations. Accordingly, the results of the HRA support that levels of CPAHs, naphthalene, pyrene, cobalt, benzene, fluoranthene, and lead present in soils would require some remediation or other form of risk management (e.g., institutional controls) in the event that the Site were to be developed in the future for residential purposes.



7.0 REMEDIAL ACTION GOALS 7.1 Overview of the Remedial Action Goals The overall remedial action goal is to ensure that residual concentrations of chemicals remaining at the Site are protective of human health and the environment. Ideally, the overall remedial action goal is to remediate the Site to a point that the conditions are safe and suitable for future hypothetical residential land use, and that long-term restrictions on future property usage would therefore not be necessary. From a practical standpoint, removal of all impacted soils located at depth may not be feasible. Accordingly, the remedial goal will be focused on reducing concentrations of COPCs in soil present on-site, as practicable and feasible, to levels that will be protective of future residential land uses. A determination as to whether the overall remedial action goal has been achieved will be based on the results obtained during the confirmation sampling, conducted following the implementation of the remedial action, and will incorporate a comprehensive quantitative post-remediation health risk evaluation. If the results of the quantitative post-remediation risk assessment indicate that the overall remedial action goal of unrestricted land use in remediated areas has not been obtained, then the types of appropriate long-term institutional controls that would be needed for the long-term protection of human health will be identified and delineated. The levels of CPAHs, naphthalene, pyrene, cobalt, benzene, fluoranthene, and lead present in soils at the Site exceed levels that would be considered acceptable for future on-site residential use. Restoring the Site to a condition that would be protective of future unrestricted land uses would thus warrant some form of remediation. When developing remedial action goals under State and Federal regulatory programs, the NCP (40 CFR 300) is commonly cited as the basis for determining an acceptable incremental risk for humans. According to the NCP, lifetime incremental cancer risks posed by a remediated site should not exceed one in a million to one hundred in a million (i.e., 10-6 to 10-4), and noncarcinogenic chemicals should not be present at levels expected to cause adverse health effects. Risk-based screening concentrations (RBSCs), concentrations of individual chemicals in soils and soil gas that correspond to an incremental cancer risk of 10-6 or a noncancer HI of 1.0 for future potential residential populations, are presented in Table 24 for both cancer effects and noncarcinogenic effects, and will be used to identify and target those areas of the Site where some form of mitigation or institutional controls may be appropriate. The derivation of the RBSCs is discussed in Section 7.2 below. As previously discussed, ambient soil concentrations of some chemicals, such as CPAHs, commonly exceed concentrations corresponding to incremental cancer risks of 10-6 to 10-4. For example, based on the results of the HRA, the concentrations of CPAHs [expressed as benzo(a)pyrene equivalents] corresponding to 10-6, 10-5 and 10-4 cancer risk levels for a residential exposure scenario are 0.036, 0.36 and 3.6 mg/kg, respectively. The statistical estimate of the average concentration of CPAHs (i.e., the 95% UCL of benzo(a)pyrene equivalent concentrations) in northern California surface soils is 0.40 mg/kg (presented in Table 25). Thus, while the levels of CPAHs in background soils do not exceed concentrations



corresponding to the upper end of the acceptable risk range defined by the USEPA in the NCP, they are greater than the concentrations corresponding to 10-6 cancer risks. Remediating the CPAHs present in soils at the Site to levels corresponding to risks at the 10-6 level (i.e., to 0.036 mg/kg and 0.39 mg/kg, respectively) would require reducing CPAH concentrations to levels below ambient levels. Because it is not usually possible or practical to reduce concentrations below ambient levels, the risk management objective normally imposed by regulatory agencies in these situations is to remediate, where practicable, to ambient levels. If remediated to the point that ambient concentrations are restored, the CPAHs in on-site soils would pose no incremental risk to human populations above that posed by ambient levels of CPAHs in northern California soils, ensuring that any potential future exposure to on-site soils is fully protective of human health. The ambient levels of CPAHs used in this HRA are discussed in Section 7.3 below. 7.2 Derivation of Risk-Based Screening Concentrations for Soil This section presents the methodology to derive the range of chemical-specific RBSCs for soils that would be protective of future residential populations. These residential RBSCs can then be used to identify those areas of the Site that could either be targeted for remediation or which should be subjected to other forms of long-term risk management. As described above, the NCP (40 CFR 300) indicates that lifetime incremental cancer risks posed by a site should not exceed a range of one in one million (1 x 10-6) to one hundred in a million (1 x 10-4) and noncarcinogenic chemicals should not be present at levels expected to cause adverse health effects (i.e., an HI greater than 1.0). As a starting point, target cancer risk levels used in the calculation of the RBSCs are set at the lower end of the risk range of 1 x 10-6. The target HI used for noncarcinogens is 1.0. These RBSCs are then compared to the soil concentrations measured at the Site to identify those chemicals and specific areas of the Site that will either be the focus of the upcoming removal activities, or be incorporated into the long-term risk management of the Site. 7.2.1 Methodology Section 6.2 presented the incremental cancer risks and noncancer hazards posed by a given concentration of chemical present at the Site under future hypothetical residential exposure scenarios. By rearranging these equations, we can set the target cancer risk or noncancer hazard at a given “acceptable” level, and then determine the concentration of a chemical that will be associated with that given target risk. This is the common method used to estimate remedial action goals for a Site, where the results of the risk assessment indicate that some form of remediation or risk management is warranted. In this HRA, the risk-based remedial action goals are referred to as RBSCs. For carcinogens, the following equation is used to derive the soil RBSC:



⎟⎟⎠

⎞⎜⎜⎝

⎛⎥⎦⎤

⎢⎣⎡

⎥⎦⎤

⎢⎣⎡

⎥⎦⎤

⎢⎣⎡

⎥⎦⎤

⎢⎣⎡

=+++

dera

dera

inga

inga

inhpa

inhpa

inhva

inhvaa

ConcRisk

ConcRisk

ConcRisk

ConcRisk

LevelRisketTcarcinogenRBSC

,

,

,

,

,

,

,

,

arg,

Where:

RBSCa,carcinogen = Risk-based Screening Concentration, chemical a, for carcinogenic effects, (mg/kg)

Target Risk Level = Target Cancer Risk Level (unitless); Riska,inhv = Calculated Cancer Risk for Chemical a for the vapor

inhalation pathway, developed as described above (unitless);

Riska,inhp = Calculated Cancer Risk for Chemical a for the particulate inhalation pathway, developed as described above (unitless);

Riska,ing = Calculated Cancer Risk for Chemical a for the soil ingestion pathway, developed as described above (unitless);

Riska,der = Calculated Cancer Risk for Chemical a for the dermal contact pathway, developed as described above (unitless);

Conca,inhv = Representative Exposure Concentration of Chemical a for the vapor inhalation pathway; mg/kg

Conca,inhp = Representative Exposure Concentration of Chemical a for the particulate inhalation pathway; mg/kg

Conca,ing = Representative Exposure Concentration of Chemical a for the soil ingestion pathway; mg/kg

Conca,der = Representative Exposure Concentration of Chemical a for the dermal contact pathway; mg/kg

For noncarcinogens, the following equation is used to derive the soil RBSC:

⎟⎟⎠

⎞⎜⎜⎝

⎛⎥⎦⎤

⎢⎣⎡

⎥⎦⎤

⎢⎣⎡

⎥⎦⎤

⎢⎣⎡

⎥⎦⎤

⎢⎣⎡

=+++

dera

dera

inga

inga

inhpa

inhpa

inhva

inhvaa

ConcHQ

ConcHQ

ConcHQ

ConcHQ

HIetTgennoncarcinoRBSC

,

,

,

,

,

,

,

,

arg,

Where:

RBSCa,noncarcinogen = Risk-based Screening Concentration, chemical a, for noncarcinogenic effects, (mg/kg)

Target HI = Target Hazard Index Level (unitless);



HQa,inhv = Calculated Hazard Quotient for Chemical a for the vapor inhalation pathway, developed as described above (unitless);

HQa,inhp = Calculated Hazard Quotient for Chemical a for the particulate inhalation pathway, developed as described above (unitless);

HQa,ing = Calculated Hazard Quotient for Chemical a for the soil ingestion pathway, developed as described above (unitless);

HQa,der = Calculated Hazard Quotient for Chemical a for the dermal contact pathway, developed as described above (unitless);

Conca,inhv = Representative Exposure Concentration of Chemical a for the vapor inhalation pathway; mg/kg

Conca,inhp = Representative Exposure Concentration of Chemical a for particulate inhalation pathway; mg/kg

Conca,ing = Representative Exposure Concentration of Chemical a for soil ingestion pathway; mg/kg

Conca,der = Representative Exposure Concentration of Chemical a for dermal contact pathway; mg/kg

As described above in Section 4.5.2, the risks associated with the inhalation of VOCs were developed using soil vapor sampling data, where available, as this soil vapor data provides the most direct estimate of the concentration of the VOC that may be present in the vapor phase. Soil vapor data, in preference over soil matrix data, is the data that is currently preferred by DTSC in evaluating the risks associated with the indoor air vapor intrusion pathway. We also understand that DTSC prefers that the outdoor air vapor pathway be incorporated into the calculation of soil risk-based goals. However, in order to formulate soil matrix RBSCs for those VOCs that were detected in the soil gas phase, the relationship between the concentration of the VOC in soils and the concentration in soil vapor needs to be determined. For developing the soil RBSCs, this soil matrix-to-soil vapor phase relationship was determined using the USEPA Soil Screening Guidance (USEPA, 1996) VF equation. In other words, for VOCs detected in soils, the VF equation was used in developing the RBSC (i.e., in developing the outdoor air vapor component of the overall multi-pathway RBSC that includes the ingestion, dermal absorption and outdoor air inhalation routes). The VF equation and calculations for VOCs detected in soils are presented in Attachment F. In general, use of the VF equation for VOCs results in RBSCs that are driven by the outdoor air vapor pathway; the RBSCs calculated using the VF equation can be extremely low due to the conservative nature of the equation. As an example, the RBSCs for the relevant VOCs were calculated under the assumption of an infinite source of mass of VOC impact that begins immediately below the ground surface. This is clearly an overestimate of the mass available for transport; this assumption was made in the development of the RBSCs merely as a screening technique and in an attempt to ensure that the proposed remedial measures remove any potentially significant mass of Site-related VOCs, as practicable and feasible.



As an example, in the case of naphthalene, the soil RBSC is driven primarily by the inhalation of outdoor air vapor pathway. An example soil RBSC calculation for naphthalene is provided in Attachment F. A final determination as to whether the Site has achieved the overall cumulative post-remedial objectives will involve soil gas confirmation samples. 7.3 Derivation of Ambient Based Screening Concentrations for Soil Given that risk-based residential cleanup goals for CPAHs in soils are below ambient concentrations, the numerical remedial goal for these compounds would not be risk-based, but rather would be based on the ambient concentrations of CPAHs. In order to facilitate the development of an ambient background data set for CPAHs in northern California, a dataset was compiled from previous site investigations in northern California conducted with the oversight of DTSC by PG&E and the United States Navy. The dataset was developed in cooperation and collaboration with a task group of representatives from the HERD and Site Mitigation branches of DTSC, Cal/EPA. The team of consulting firms involved in the development of the database were ENVIRON, Entrix, Iris Environmental, and ENV America. The final dataset consists of eighty-six data points from twenty-one different sites. The details of this study are presented in a report that was submitted to HERD June 7, 2002 (ENVIRON et al., 2002). Multiple analyses conducted in the study demonstrate that the final dataset is consistent with a lognormal distribution and support the hypothesis that the final dataset represents a single background population. The arithmetic mean and the 95% UCL of the mean of the background CPAH dataset, in benzo(a)pyrene equivalents, are 0.21 mg/kg and 0.40 mg/kg, respectively. Recently, DTSC has issued an Advisory (Cal/EPA 2009a) that supports the use of the PAH background dataset as a tool for assessing PAH impacts and making remediation decisions for PAHs at sites. Consistent with the approaches used at other sites, and with the approach often used for determining ambient-based remediation targets for inorganics, an upper tolerance limit (UTL) of the ambient distribution is often proposed as the initial remediation target for the Site. The USEPA has described the calculation of the UTL, and has suggested its use for groundwater monitoring activities (USEPA, 1989b), although it is applicable to performing background comparisons for soil samples as well. The approach used in calculating the UTL is consistent with the approach recommended by the USEPA (1989b). Table 25 presents the UTL of the 86 background samples. As indicated, the 95% UTL (95% coverage and 95% confidence) is 1.5 mg/kg (in benzo(a)pyrene equivalents). Because the coverage of the UTL is set at 95%, approximately 5% of samples that are actually representative of ambient concentrations will be greater than the UTL of 1.5 mg/kg. Another parameter that is commonly used in establishing ambient-based remediation targets is the 95th percentile of the distribution. Measured concentrations that are below the 95th percentile are considered to be ambient. It is understood that the DTSC has recommended the use of the 95th percentile for determining ambient levels of metals at former military bases. As indicated in Table 25, the 95th percentile of the northern California background dataset is 0.92 mg/kg. Because the 95th percentile is lower than the UTL of the data, we propose to use 0.92 mg/kg as the initial ambient based screening concentration (ABSC) for identifying areas of the



Site for either remediation or other forms of risk management. On-site concentrations below the initial background-based screening concentration ABSC of 0.9 mg/kg will be considered representative of ambient concentrations, and will not initially be targeted for remediation or other forms of risk management. 7.4 Results: Comparison of Soil RBSCs and ABSCs to Detected Concentrations RBSCs for individual chemicals in soils that correspond to a cancer risk of 10-6 or a noncancer hazard index of 1.0 for future potential residential populations are presented in Table 24 for cancer effects and noncarcinogenic effects. The OEHHA residential soil CHHSL for lead of 80 mg/kg is used in this HRA as the target RBSC for lead for future on-site residents, as recommended by DTSC (Cal/EPA, 2009e) and is also presented in Table 24. The ABSC for CPAHs is also presented in Table 24. Table 26 summarizes the samples and chemicals with concentrations above their respective residential RBSCs and ambient concentrations. As indicated, chemicals with individual detections that exceed their respective residential soil RBSCs/ABSCs include 2-methylnaphthalene, acenaphthylene, antimony, benzene, benzo(g,h,i)perylene, CPAHs (expressed as benzo(a)pyrene equivalent), cobalt, ethylbenzene, fluoranthene, lead, naphthalene, nickel, pyrene, and thallium. The samples in the top 10 feet of on-site soils where the above compounds were detected at concentrations above or equivalent to their respective residential RBSCs or ambient concentrations are mostly collocated with sample locations and depths that contain CPAHs at levels above both the RBSC and/or ambient concentrations. Exceptions to this case are samples SS-10 (lead), TP-1-0.5' (lead), TP-5-0.5' (lead), SB-37-0' (naphthalene), SB-39-0' (naphthalene), SB-40-3' (lead), SB-44-0' (nickel), and SB-45-0' (naphthalene), where exceedances of lead, naphthalene, or nickel occur without a concomitant exceedance of the CPAH ABSC. 7.5 Demonstrating Attainment of the Remedial Action Goal: Post Remediation Risk

Assessment Following the completion of remediation activities, soil confirmation samples will be collected from the base and sidewalls of the excavated areas and analyzed for PAHs, VOCs, and select metals. Further, soil gas confirmation samples will be collected from areas excavated due to elevated levels of VOCs in soils; for instance, in the vicinity of SB-6 and SB-49. The measured concentrations from these confirmation samples will be evaluated to confirm attainment of the remedial action goals. A post-remediation risk assessment will be conducted to evaluate the overall effectiveness of the remediation in achieving the stated remedial action goals. The post-remediation risk assessment will describe whether the remedial action goals for the Site have been attained, and will provide the technical basis for any mitigation measures and institutional controls that will be appropriate to ensure the long-term protection of human health associated with residual impacts that remain on-site.



8.0 REFERENCES American Society for Testing and Materials (ASTM). 1995. Standard Guide for Risk-Based

Corrective Action Applied at Petroleum Release Sites. Designation: E 1739-95. California Environmental Protection Agency (Cal/EPA). 2011. Toxicity Criteria Database.

Table of cancer potency factors (July 21, 2009) maintained on-line at http://www.oehha.ca.gov/risk/pdf/tcdb072109alpha.pdf. Office of Environmental Health Hazard Assessment (OEHHA). Table of Air Chronic Reference Exposure Levels Adopted by OEHHA maintained on-line at http://www.oehha.ca.gov/air/allrels.html. Office of Environmental Health Hazard Assessment (OEHHA).

California Environmental Protection Agency (Cal/EPA). 2009a. Use of the Northern and

Southern California Polynuclear Aromatic Hydrocarbon (PAH) Studies in the Manufactured Gas Plant Site Cleanup Process. Department of Toxic Substances Control. July 1.

California Environmental Protection Agency (Cal/EPA). 2009b. Interim Guidance Evaluating

Human Health Risks from Total Petroleum Hydrocarbons (TPH). Department of Toxic Substances Control. Human and Ecological Risk Division (HERD). June 16.

California Environmental Protection Agency (Cal/EPA). 2009c. Johnson and Ettinger SG-

SCREEN Model, EPA Version 2.0, dated April 2003, as modified by DTSC February 4. California Environmental Protection Agency (Cal/EPA). 2009d. Arsenic Strategies,

Determination of Arsenic Remediation, Development of Arsenic Cleanup Goals. Department of Toxic Substances Control. January 16.

California Environmental Protection Agency (Cal/EPA). 2009e. Revised California Human

Health Screening Levels for Lead. Department of Toxic Substances Control. September. California Environmental Protection Agency (Cal/EPA). 2005. DTSC/HERD Human Health

Risk Assessment (HHRA) Note Number 1. Department of Toxic Substances Control (DTSC). October 27.

California Environmental Protection Agency (Cal/EPA). 1997. Selecting Inorganic

Constituents as Chemicals of Potential Concern at Risk Assessments at Hazardous Waste Site and Permitted Facilities. Sacramento, California. February.

California Environmental Protection Agency (Cal/EPA). 1994. Preliminary Endangerment

Assessment Guidance Manual. Department of Toxic Substances Control. January. California Environmental Protection Agency (Cal/EPA). 1993. Addendum to Chapter 7 of

DTSC Supplemental Guidance for Human Health Multimedia Risk Assessments of Hazardous Waste Sites and Permitted Facilities, Memorandum to Interested Parties



(Including Lead Spreadsheet Model Version 6). Department of Toxic Substances Control (DTSC). June 10.

ENVIRON Corporation, Iris Environmental, and ENV America (ENVIRON et al.). 2002.

Background Levels of Polycyclic Aromatic Hydrocarbons in Northern California Surface Soil. June 7.

Iris Environmental. 2010. Memorandum for Meeting with DTSC on November 11, 2010.

Follow up from September 29th, 2010 Health Risk Assessment Scoping Meeting: PG&E Former Lodi Manufactured Gas Plant Site. November 11.

Office of Environmental Health Hazard Assessment (OEHHA). 2007. Development of Health

Criteria for Schools Site Risk Assessment Pursuant to Health and Safety Code Section 901(g): Proposed Child-Specific Benchmark Change in Blood Lead Concentration for School Site Risk Assessment. Available at: http://www.oehha.ca.gov/public_info/public/kids/index.html

Stantec. 2010. Final Remedial Investigation Completion Report: Former Lodi Manufactured

Gas Plant, 712 South Sacramento Street, Lodi, California. June 20. Treadwell and Rollo. 2008. Report of Third Quarter 2007 Groundwater Monitoring. January 8. U.S. Environmental Protection Agency (USEPA). 2011. Integrated Risk Information System

(IRIS). http://www.epa.gov/iris/ U.S. Environmental Protection Agency (USEPA). 2010a. ProUCL Version 4.00.05 Technical

Guide (Draft). EPA/600/R-07/041. May. U.S. Environmental Protection Agency (USEPA). 2010b ProUCL Version 4.00.05 User Guide

(Draft). EPA/600/R-07/038. May. U.S. Environmental Protection Agency (USEPA). 2010c. USEPA Regional Screening Levels

for Chemical Contaminants at Superfund Sites, Nov 2010. Available at http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/Generic_Tables/pdf/master_sl_table_run_NOV2010.pdf.

U.S. Environmental Protection Agency (USEPA). 2009. Risk Assessment Guidance for

Superfund. Volume 1: Human Health Evaluation Manual (Part F, Supplemental Guidance for Inhalation Risk Assessment). Final. OSWER Directive 9285.7-82. EPA-540-R1-070-002. January.

U.S. Environmental Protection Agency (USEPA). 2004a. User’s Guide for Evaluating

Subsurface Vapor Intrusion into Buildings. Office of Emergency and Remedial Response Washington, D.C. Revised February 22, 2004.



U.S. Environmental Protection Agency (USEPA). 2004b. Preliminary Remediation Goals. Maintained online at http://www.epa.gov/region9/waste/sfund/prg/index.html.

U.S. Environmental Protection Agency (USEPA). 2003a. Memorandum: Human Health

Toxicity Values in Superfund Risk Assessment. OSWER Directive 9285.7-53. December 5.

U.S. Environmental Protection Agency (USEPA). 2003b. Recommendations of the Technical

Review Workgroup for Lead for an Approach to Assessing Risks Associated with Adult Exposures to Lead in Soil. EPA-540-R-03-001. January.

U.S. Environmental Protection Agency (USEPA). 2002a. Calculating Upper Confidence Limits

for Exposure Point Concentrations at Hazardous Waste Sites. Office of Emergency and Remedial Response. Washington, D.C. OSWER 9285.6-10. December.

U.S. Environmental Protection Agency (USEPA). 2002b. Supplemental Guidance for

Developing Soil Screening Levels for Superfund Sites. OSWER 9355.4-24. December. U.S. Environmental Protection Agency (USEPA). 1997. Health Effects Assessment Summary

Tables (HEAST) FY 1997 Update. Office of Solid Waste and Emergency Response. EPA 540-R-97-036. July.

U.S. Environmental Protection Agency (USEPA). 1996. Soil Screening Guidance: User’s

Guide. Office of Solid Waste and Emergency Response. EPA/540/R-96/018. April. U.S. Environmental Protection Agency (USEPA). 1991. Risk Assessment Guidance for

Superfund. Volume I: Human Health Evaluation Manual. Supplemental Guidance. Standard Default Exposure Factors. Office of Emergency and Remedial Response. March 25.

U.S. Environmental Protection Agency (USEPA). 1989a. Risk Assessment Guidance for

Superfund. Volume 1: Human Health Evaluation Manual (Part A). Interim Final. Office of Emergency and Remedial Response. EPA-540/1-89/002. Washington, D.C. December.

U.S. Environmental Protection Agency (USEPA). 1989b. Statistical Analysis of Ground-Water

Monitoring Data at RCRA Facilities. Interim Final Guidance. Office of Solid Waste. April.


IRIS ENVIRONMENTAL

TABLES

Detection Frequency

(Detections/ Samples

Analyzed)

Range of Detected Concentrations a

(mg/kg)

Arithmetic Mean

(mg/kg)

95% UCL of Planter

Concentrations b

(mg/kg)

Site-Specific Background

Detection Frequency


Analyzed)

Range of Site-Specific Background

Concentrations a

(mg/kg)

95% UCL of Site-Specific Background

Concentrations b

(mg/kg)

Included in Risk

Assessment c

Volatile Organic CompoundsBenzene 24 / 55 0.00077 - 0.13 0.022 0.014 -- -- -- YesEthylbenzene 1 / 55 0.061 0.017 NC -- -- -- YesToluene 15 / 55 0.00062 - 0.99 0.036 0.10 -- -- -- Yesm,p-Xylene 4 / 55 0.0010 - 0.39 0.024 NC -- -- -- Yeso-Xylene 2 / 55 0.00058 - 0.17 0.019 NC -- -- -- YesTotal Petroleum HydrocarbonsTPH as Diesel 50 / 55 5.8 - 6,500 986 1,902 -- -- -- YesTPH as Gasoline 7 / 55 0.028 - 330 6.5 17 -- -- -- YesTPH as Motor Oil 48 / 55 19 - 14,000 2,265 5,129 -- -- -- YesPolycyclic Aromatic Hydrocarbons1-Methylnaphthalene 6 / 37 0.065 - 0.55 0.48 0.18 -- -- -- Yes2-Methylnaphthalene 15 / 46 0.058 - 0.81 0.50 0.25 -- -- -- YesAcenaphthene 10 / 55 0.019 - 1.6 0.54 0.16 -- -- -- YesAcenaphthylene 27 / 55 0.026 - 20 2.3 3.0 -- -- -- YesAnthracene 19 / 55 0.027 - 13 1.3 1.8 -- -- -- YesBenzo(a)anthracene 43 / 55 0.013 - 83 7.6 16 -- -- -- YesBenzo(a)pyrene 46 / 55 0.028 - 110 13 45 -- -- -- YesBenzo(b)fluoranthene 46 / 55 0.023 - 180 15 56 -- -- -- YesBenzo(g,h,i)perylene 46 / 55 0.030 - 140 19 61 -- -- -- YesBenzo(k)fluoranthene 44 / 55 0.020 - 220 13 33 -- -- -- YesChrysene 46 / 55 0.016 - 95 10 35 -- -- -- YesDibenz(a,h)anthracene 22 / 55 0.020 - 13 1.6 2.1 -- -- -- YesFluoranthene 48 / 55 0.029 - 300 32 118 -- -- -- YesFluorene 13 / 55 0.040 - 10 0.84 0.97 -- -- -- Yes

TABLE 1

Former Lodi Manufactured Gas PlantEXPOSED SOILS (0-0.5 FEET BGS)

Lodi, California

SUMMARY OF CHEMICALS INCLUDED IN THE RISK ASSESSMENT:

Chemical

d

d

d

e

e

e

e

ee

Lodi_HRA_Tables Page 1 of 3 IRIS ENVIRONMENTAL

Detection Frequency


Analyzed)


(mg/kg)

Arithmetic Mean

(mg/kg)

95% UCL of Planter

Concentrations b

(mg/kg)


Detection Frequency


Analyzed)


Concentrations a

(mg/kg)


Concentrations b

(mg/kg)

Included in Risk

Assessment c

TABLE 1


Lodi, California


ChemicalIndeno(1,2,3-cd)pyrene 46 / 55 0.029 - 100 15 48 -- -- -- YesNaphthalene 37 / 55 0.029 - 180 6.2 27 -- -- -- YesPhenanthrene 50 / 55 0.022 - 220 20 76 -- -- -- YesPyrene 49 / 55 0.027 - 340 37 133 -- -- -- Yes

Benzo(a)pyrene Equivalent 55 / 55 0.018 - 170 19 48 73 / 86 0.0027-2.81 0.4 YesInorganicsAmmonia (as N) 1 / 1 310 310 NC -- -- -- YesAntimony 11 / 50 0.54 - 50 2.4 7.7 0 / 12 ND NC YesArsenic 49 / 50 0.81 - 10 3.3 3.9 12 / 12 1.27 - 4.17 2.8 NoBarium 50 / 50 25 - 191 100 108 12 / 12 85.17 - 118 109 YesBeryllium 13 / 50 0.16 - 0.50 0.15 0.22 6 / 12 0.253 - 0.369 0.31 YesCadmium 5 / 50 0.17 - 0.74 0.28 0.56 2 / 12 0.505 - 0.638 NC YesChromium 50 / 50 2.7 - 59 12 18 12 / 12 6.28 - 12.4 10 YesCobalt 50 / 50 1.5 - 11 5.5 5.9 12 / 12 3.68 - 7.32 5.9 YesCopper 50 / 50 5.4 - 180 29 49 12 / 12 6.75 - 14.7 12 YesCyanide, Total 10 / 25 0.68 - 13 1.6 2.8 -- -- -- YesLead 51 / 51 2.8 - 24,800 766 1,291 12 / 12 2.79 - 22.6 22 YesMercury 16 / 50 0.0093 - 2.8 0.13 0.23 5 / 12 0.0858 - 0.144 0.12 YesMolybdenum 19 / 50 0.10 - 22 1.5 4.1 1 / 12 0.251 NC YesNickel 50 / 50 3.0 - 4,330 141 522 12 / 12 5.16 - 7.85 7.0 YesSelenium 0 / 50 ND NC NC 3 / 12 0.774 - 0.825 NC NoSilver 10 / 50 0.17 - 0.58 0.17 0.27 4 / 12 0.272 - 0.418 NC YesThallium 1 / 50 7.8 0.62 NC 0 / 12 ND NC Yes

Carcinogenic Polycyclic Aromatic Hydrocarbons

g

e

f

h


Detection Frequency


Analyzed)


(mg/kg)

Arithmetic Mean

(mg/kg)

95% UCL of Planter

Concentrations b

(mg/kg)


Detection Frequency


Analyzed)


Concentrations a

(mg/kg)


Concentrations b

(mg/kg)

Included in Risk

Assessment c

TABLE 1


Lodi, California


ChemicalVanadium 50 / 50 7.8 - 157 32 50 12 / 12 20.7 - 36.6 29 YesZinc 50 / 50 16 - 384 94 110 12 / 12 25.9 - 76.3 57 Yes

Notes:

a

b

c

d

e

f

g

h

Sources:California Environmental Protection Agency (Cal/EPA). 1994. Preliminary Endangerment Assessment Guidance Manual. Department of Toxic Substances Control (DTSC). January. United States Environmental Protection Agency (USEPA). 2010. ProUCL Version 4.00.05 User Guide (Draft). EPA/600/R-07/038. May.

The range of concentrations in exposed soils (0-0.5 feet below ground surface [bgs]) of the Site collected during the 2006 Surface Soil Sampling conducted by ENV America, 2008-2009 Remedial Investigation and 2010 Remedial Area Refinement Sampling was conducted by Stantec. Soil samples collected within 0-0.5 feet bgs depth interval at all sampling locations were included in the exposed soils dataset with the exception of samples from locations in the adjacent right-of-way (i.e. South Sacrament Street; SB-3, SB-4, SB-11, SB-12, SB-26 through SB-33, SB-47, and SB-58 through SB-61) . Corresponds to the 95% Upper Confidence Limit (UCL) of the mean calculated using USEPA (2010) ProUCL Statistical Program. Inorganics and carcinogenic PAHs were included in the risk assessment if either the maximum detected concentration or the 95% UCL is above maximum detected concentration or 95% UCL in the background data set, respectively. If the 95% UCL is greater than the maximum detected concentration, the maximum detected concentration is used for screening purposes in both the site and background datasets. All other chemicals (i.e., organics) were included in the risk assessment if they were ever detected in soil. Per Cal/EPA PEA guidance, lead is included regardless of background levels.TPH evaluated using detected individual related constituents.Carcinogenic polycyclic aromatic hydrocarbons (PAH). Benzo(a)pyrene equivalent concentration for carcinogenic PAH was calculated using the Potency Equivalency Factors, as recommended by Cal/EPA (1994).

ND =

NC =

Not detected.Not analyzed for.

Not calculated. In order for ProUCL 4.0 to reliably evaluate a specific data population (e.g., dataset of concentrations of a particular chemical measured at the site), the population must include at least eight results including at least five detections.

Represents the 95% UCL of the background PAH data set for Northern California used for risk management purposes.

-- =

Arsenic concentrations were determined to be ambient levels and therefore, arsenic was not included as a chemical of potential concern (COPC) in the risk assessment. See Attachment B for details of analysis.


Detection Frequency


Analyzed)


(mg/kg)

Arithmetic Mean

(mg/kg)

95% UCL of On-site

Concentrations b

(mg/kg)


Detection Frequency


Analyzed)


Concentrations a

(mg/kg)


Concentrations b

(mg/kg)

Included in Risk

Assessment c

Volatile Organic CompoundsBenzene 56 / 279 0.00033 - 2,700 9.7 71 -- -- -- YesEthylbenzene 4 / 279 0.0022 - 50 0.21 NC -- -- -- YesToluene 25 / 279 0.00062 - 0.99 0.93 0.041 -- -- -- Yesm,p-Xylene 8 / 279 0.00070 - 58 0.24 0.58 -- -- -- Yeso-Xylene 5 / 279 0.00058 - 19 0.095 0.20 -- -- -- YesTotal Petroleum HydrocarbonsTPH as Diesel 150 / 279 5.4 - 42,000 758 2,015 -- -- -- YesTPH as Gasoline 35 / 279 0.013 - 2,800 27 116 -- -- -- YesTPH as Motor Oil 133 / 279 19 - 35,000 1,377 2,421 -- -- -- YesPolycyclic Aromatic Hydrocarbons1-Methylnaphthalene 9 / 205 0.024 - 0.55 5.0 0.078 -- -- -- Yes2-Methylnaphthalene 23 / 214 0.021 - 1,000 7.2 34 -- -- -- YesAcenaphthene 30 / 279 0.015 - 12 3.9 0.36 -- -- -- YesAcenaphthylene 77 / 279 0.023 - 4,100 21 118 -- -- -- YesAnthracene 49 / 279 0.011 - 2,400 11 63 -- -- -- YesBenzo(a)anthracene 136 / 279 0.013 - 3,300 22 108 -- -- -- YesBenzo(a)pyrene 148 / 279 0.014 - 7,600 46 237 -- -- -- YesBenzo(b)fluoranthene 150 / 279 0.012 - 4,600 29 143 -- -- -- YesBenzo(g,h,i)perylene 166 / 279 0.011 - 11,000 58 316 -- -- -- YesBenzo(k)fluoranthene 136 / 279 0.020 - 4,700 28 145 -- -- -- YesChrysene 151 / 279 0.014 - 4,400 30 146 -- -- -- YesDibenz(a,h)anthracene 56 / 279 0.020 - 16 4.2 1.2 -- -- -- YesFluoranthene 167 / 279 0.016 - 20,000 119 617 -- -- -- YesFluorene 30 / 279 0.010 - 1,400 7.2 37 -- -- -- Yes

TABLE 2

Former Lodi Manufactured Gas PlantSOILS (0-10 FEET BGS)

Lodi, California


Chemical

d

d

d

e

e

e

e

ee


Detection Frequency


Analyzed)


(mg/kg)

Arithmetic Mean

(mg/kg)

95% UCL of On-site

Concentrations b

(mg/kg)


Detection Frequency


Analyzed)


Concentrations a

(mg/kg)


Concentrations b

(mg/kg)

Included in Risk

Assessment c

TABLE 2


Lodi, California


ChemicalIndeno(1,2,3-cd)pyrene 154 / 279 0.010 - 7,500 42 219 -- -- -- YesNaphthalene 110 / 279 0.016 - 23,000 93 608 -- -- -- YesPhenanthrene 155 / 279 0.012 - 13,000 90 452 -- -- -- YesPyrene 173 / 279 0.014 - 21,000 125 645 -- -- -- Yes

Benzo(a)pyrene Equivalent 279 / 279 0.0088 - 9,824 60 232 73 / 86 0.0027-2.81 0.4 YesInorganicsAmmonia (as N) 8 / 8 5.6 - 310 87 230 -- -- -- YesAntimony 19 / 243 0.54 - 50 0.91 1.9 0 / 12 ND NC YesArsenic 233 / 243 0.80 - 12 2.7 2.9 12 / 12 1.27 - 4.17 2.8 NoBarium 243 / 243 23 - 415 97 101 12 / 12 85.17 - 118 109 YesBeryllium 81 / 243 0.11 - 0.71 0.18 0.23 6 / 12 0.253 - 0.369 0.31 YesCadmium 9 / 243 0.17 - 3.4 0.28 0.57 2 / 12 0.505 - 0.638 NC YesChromium 243 / 243 1.5 - 59 8.9 9.5 12 / 12 6.28 - 12.4 10 YesCobalt 243 / 243 0.62 - 139 7.0 8.0 12 / 12 3.68 - 7.32 5.9 YesCopper 243 / 243 2.2 - 180 14 19 12 / 12 6.75 - 14.7 12 YesCyanide, Total 26 / 127 0.51 - 13 0.98 1.5 -- -- -- YesLead 244 / 244 1.1 - 24,800 184 631 12 / 12 2.79 - 22.6 22 YesMercury 30 / 243 0.0064 - 2.8 0.059 0.063 5 / 12 0.0858 - 0.144 0.12 YesMolybdenum 36 / 243 0.10 - 22 0.47 0.73 1 / 12 0.251 NC YesNickel 243 / 243 2.1 - 4,330 38 117 12 / 12 5.16 - 7.85 7.0 YesSelenium 0 / 243 ND NC NC 3 / 12 0.774 - 0.825 NC NoSilver 12 / 243 0.17 - 3.6 0.15 0.28 4 / 12 0.272 - 0.418 NC YesThallium 1 / 243 7.8 0.43 NC 0 / 12 ND NC YesVanadium 243 / 243 7.8 - 157 32 34 12 / 12 20.7 - 36.6 29 Yes


g

e

f

h


Detection Frequency


Analyzed)


(mg/kg)

Arithmetic Mean

(mg/kg)

95% UCL of On-site

Concentrations b

(mg/kg)


Detection Frequency


Analyzed)


Concentrations a

(mg/kg)


Concentrations b

(mg/kg)

Included in Risk

Assessment c

TABLE 2


Lodi, California


ChemicalZinc 243 / 243 13 - 574 56 72 12 / 12 25.9 - 76.3 57 Yes

Notes:

a

b

c

d

e

f

g

h

Sources:California Environmental Protection Agency (Cal/EPA). 1994. Preliminary Endangerment Assessment Guidance Manual. Department of Toxic Substances Control (DTSC). January. United States Environmental Protection Agency (USEPA). 2010. ProUCL Version 4.00.05 User Guide (Draft). EPA/600/R-07/038. May.

Not detected.Not analyzed for.

Not calculated. In order for ProUCL 4.0 to reliably evaluate a specific data population (e.g., dataset of concentrations of a particular chemical measured at the site), the population must include at least eight results including at least five detections.

Represents the 95% UCL of the background PAH data set for Northern California used for risk management purposes.

-- =

NC =

Arsenic concentrations were determined to be ambient levels and therefore, arsenic was not included as a chemical of potential concern (COPC) in the risk assessment. See Attachment B for details of analysis.

ND =

The range of concentrations in soils (0-10 feet below ground surface [bgs]) of the Site collected during the 2006 Surface Soil Sampling conducted by ENV America, 2008-2009 Remedial Investigation and 2010 Remedial Area Refinement Sampling was conducted by Stantec. For purposes of remedial decision-making, the boundary of ‘Site’ will include: 1) Street to the west of the site (South Sacramento Street) and 2) 30-foot strip on Lodi Iron Works (LIW) property directly south of Site. As such, all data collected off-site in South Sacramento Street and on LIW property are included in the Site dataset used in the quantitative HRA.

Corresponds to the 95% Upper Confidence Limit (UCL) of the mean calculated using USEPA (2010) ProUCL Statistical Program. Inorganics and carcinogenic PAHs were included in the risk assessment if either the maximum detected concentration or the 95% UCL is above maximum detected concentration or 95% UCL in the background data set, respectively. If the 95% UCL is greater than the maximum detected concentration, the maximum detected concentration is used for screening purposes in both the site and background datasets. All other chemicals (i.e., organics) were included in the risk assessment if they were ever detected in soil. Per Cal/EPA PEA guidance, lead is included regardless of background levels.TPH evaluated using detected individual related constituents.Carcinogenic polycyclic aromatic hydrocarbons (PAH). Benzo(a)pyrene equivalent concentration for carcinogenic PAH was calculated using the Potency Equivalency Factors, as recommended by Cal/EPA (1994).


On-site Detection Frequency(Detections/Samples

Analyzed)

Range of On-site Detected

Concentrations a

(µg/m3)

Included in Risk

Assessment b

Volatile Organic Compounds1,1-Difluoroethane 1 / 12 5 Yes1,2,4-Trimethylbenzene 12 / 12 11 - 240 Yes1,3,5-Trimethylbenzene 10 / 12 26 - 91 Yes2-Butanone (Methyl Ethyl Ketone) 10 / 12 3 - 8 Yes2-Hexanone 1 / 12 4 Yes4-Ethyltoluene 12 / 12 8 - 310 YesAcetone 12 / 12 18 - 260 YesBenzene 6 / 12 1 - 8 YesCarbon Disulfide 1 / 12 34 YesCumene 8 / 12 6 - 27 YesEthanol 2 / 12 3 - 16 YesEthylbenzene 11 / 12 4 - 690 YesFreon 11 3 / 12 1 - 2 YesFreon 12 2 / 12 1 - 1 YesHeptane 4 / 12 1 - 13 YesMethyl tert-butyl ether 6 / 12 1 - 14 YesNaphthalene 2 / 12 15 - 23 YesPropylbenzene 8 / 12 10 - 48 YesStyrene 1 / 12 5 YesTetrachloroethene 5 / 12 2 - 9 YesToluene 12 / 12 7 - 8,000 YesTotal Xylenes 12 / 12 20 - 3,490 YesTrichloroethene 2 / 12 2 - 6 Yes

Notes:

a

b

The range of Site soil gas concentrations collected during the 2008-2009 Remedial Investigation conducted by Stantec. All detected volatile organic compounds (VOCs) in soil gas were included in the risk assessment.

micrograms per liter.Not detected.

µg/L = ND =

Chemical

TABLE 3SUMMARY OF CHEMICALS INCLUDED IN THE RISK ASSESSMENT:

SOIL GASFormer Lodi Manufactured Gas Plant

Lodi, California


ScenarioCurrent Populations Future Populations

Off-siteCommercial

Worker

Off-site Resident

Child

Off-siteResident

Adult

Off-siteResident,

Age-AdjustedAdult

On-site Resident

Child

On-site Resident

Adult

On-siteResident,

Age-AdjustedAdult

Inhalation of Soil Particulates Particulate Emission Factor a PEF 1.2E+09 1.2E+09 1.2E+09 1.2E+09 1.2E+09 1.2E+09 1.2E+09 m3/kg

Dermal Contact with Soil Surface Area b SA NA NA NA NA 2,900 5,700 5,700 cm2/day Adherence Factor c AF NA NA NA NA 0.2 0.07 0.07 mg/cm2

Absorption Factor-PAHs d ABS-PAH NA NA NA NA 0.15 0.15 0.15 unitless Absorption Factor-Metals d ABS-Met NA NA NA NA 0.01 0.01 0.01 unitless Absorption Factor-Arsenic d ABS-As NA NA NA NA 0.03 0.03 0.03 unitless Absorption Factor-Cadmium d ABS-Cd NA NA NA NA 0.001 0.001 0.001 unitless Absorption Factor-Mercury d ABS-Hg NA NA NA NA 0.1 0.1 0.1 unitless Absorption Factor-Organics d ABS-Org NA NA NA NA 0.1 0.1 0.1 unitless Conversion Factor CF NA NA NA NA 1.0E-06 1.0E-06 1.0E-06 kg/mg

Ingestion of Soil Ingestion Rate e IR NA NA NA NA 200 100 100 mg/day Conversion Factor CF NA NA NA NA 1.0E-06 1.0E-06 1.0E-06 kg/mg

Population-Specific Intake Parameters Exposure Time ET 8 NA NA NA NA NA NA hrs/dayTime Conversion Factor TCF 24 NA NA NA NA NA NA hrs/day Exposure Frequency f EF 250 350 350 350 350 350 350 days/yr Exposure Duration ED 25 6 30 24 6 30 24 yr Body Weight BW 70 15 70 70 15 70 70 kg Averaging Time-Carcinogens ATc 25,550 25,550 25,550 25,550 25,550 25,550 25,550 days Averaging Time-Noncarcinogens ATnc 9,125 2,190 10,950 NA 2,190 10,950 NA days

Notes:Not applicable; incomplete exposure pathway or parameter not applicable to exposure scenario.

a

b

c

d

e

TABLE 4EXPOSURE PARAMETERS


Ingestion rates recommended by Cal/EPA (2005) for residential populations.

NA =

Lodi, California

Exposure Parameter

Corresponds to the area of exposed skin in each respective population (Cal/EPA 2005).

Symbol Units

The particulate emission factor (PEF) is calculated using the equations found in the Soil Screening Guidance (USEPA 2002), with input parameters as found in Attachment D of this HRA.

Soil adherence factors recommended by Cal/EPA (2005) for respective populations. Dermal absorption factors for specific compound classes from Cal/EPA (1994).

g g ggi


TABLE 4EXPOSURE PARAMETERS

Former Lodi Manufactured Gas PlantLodi, California

Notes:f

g

Sources:

For the residents, corresponds to 7 days/week for 50 weeks/year. For the commercial worker, corresponds to 5 days/week for 50 weeks/year.Per Cal/EPA guidance, cancer risks for future on-site residents are calculated using an age-adjusted approach to account for the higher exposures per body weight that occur during the childhood years. Accordingly, for carcinogenic effects, the evaluation assumes that the resident is a child for the first 6 years of exposure and an adult for the remaining 24 years. For noncarcinogenic hazards, the averaging time for the adult resident is 30 years.

California Environmental Protection Agency (Cal/EPA). 2005. DTSC/HERD Human Health Risk Assessment (HHRA) Note Number 1. Department of Toxic S b t C t l (DTSC) O t b 27U.S. Environmental Protection Agency (USEPA). 2002. Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. Office of Soild Waste and Emergency Response. Washington, DC, December.

California Environmental Protection Agency (Cal/EPA). 1994. Preliminary Endangerment Assessment Guidance Manual. Department of Toxic Substances


Exposure Concentration: Vapor Inhalation

Noncancer

Cancer

where Ca = Csg x AC for soil gas to indoor air pathway where Ca = Csg x TF for soil gas to outdoor air pathway

Exposure Concentration: Soil Particulate Inhalation

Noncancer

Cancer

Chronic Daily Intake: Dermal Contact

Noncancer

Cancer

Lodi, California

TABLE 5EQUATIONS USED TO CALCULATE EXPOSURE CONCENTRATIONS AND CHRONIC DAILY INTAKES:

RESIDENTIAL SCENARIOFormer Lodi Manufactured Gas Plant

ATnc, adult

ECinhv, c =Ca x EF x EDadult

ATc

CDIderm, age adjusted, c =Cs x SAchild x AFchild x ABS x EF x EDchild x CF

BWchild x ATc

Cs x SAadult x AFadult x ABS x EF x EDadult, age adjusted x CF

ATc

BWadult x ATc

Cs x SAadult x AFadult x ABS x EF x EDadult x CF

BWadult x ATnc, adult

Cs x SAchild x AFchild x ABS x EF x EDchild x CF

BWchild x ATnc, child

ECinhp, nc =Cs x (1/PEF) x EF x EDadult

CDIderm, child, nc = CDIderm, adult =

ECinhv, nc =Ca x EF x EDadult

ATnc, adult

ECinhp, c =Cs x (1/PEF) x EF x EDadult


Lodi, California

TABLE 5EQUATIONS USED TO CALCULATE EXPOSURE CONCENTRATIONS AND CHRONIC DAILY INTAKES:

RESIDENTIAL SCENARIOFormer Lodi Manufactured Gas Plant

Chronic Daily Intake: Soil Ingestion

Noncancer

Cancer

BWadult x ATc

Where:ABS = Absorption Factor [Unitless]AC = Soil Gas-to-Indoor Air Attenuation Coefficient [Unitless]AF = Soil to Skin Adherence Factor [mg/cm2]ATc = Averaging Time for Carcinogenic Compounds [days]ATnc = Averaging Time for Noncarcinogenic Compounds [days]BW = Body Weight [kg]Ca = Concentration of Chemical in Air [mg/m3]Cs = Concentration of Chemical in Soil [mg/kg]Csg = Concentration of Chemical in Soil Gas [mg/m3]

CDIderm = Chronic Daily Intake: Dermal Contact [mgchemical/kgbody weight-day]CDIing = Chronic Daily Intake: Ingestion [mgchemical/kgbody weight-day]

CF = Conversion Factor [kg/mg]ECinhp = Exposure Concentration: Soil Particulate Inhalation [mgchemical/m

3air]

ECinhv = Exposure Concentration: Vapor Inhalation [mgchemical/m3

air]ED = Exposure Duration [years]EF = Exposure Frequency [days/year]IR = Soil Ingestion Rate [mg/day]

PEF = Soil-to-Air Particulate Emission Factor [m3/kg ]SA = Surface Area of Exposed Skin [cm2/day]TF = Soil Gas-to-Air Transfer Factor [mg/m3]/[mg/m3]

CDIing, age adjusted, c =Cs x IRchild x CF x EF x EDchild Cs x IRadult x CF x EF x EDadult, age adjusted

BWchild x ATc

BWchild x ATnc, child BWadult x ATnc, adult

Cs x IRadult x CF x EF x EDadultCDIing, child, nc =

Cs x IRchild x CF x EF x EDchildCDIing, adult =


Exposure Concentration: Vapor Inhalation

Noncancer

Cancer

where Ca = Csg x TF for soil gas to outdoor air pathway

Exposure Concentration: Soil Particulate Inhalation

Noncancer

Cancer

EQUATIONS USED TO CALCULATE EXPOSURE CONCENTRATIONS AND CHRONIC DAILY INTAKES:COMMERCIAL WORKER SCENARIO


TABLE 6

ECinhp, worker, c =Cs x (1/PEF) x ET x (1/TCF) x EF x EDworker

ATc

ATnc, worker

ECinhp, worker, nc =Cs x (1/PEF) x ET x 1/(TCF) x EF x EDworker

ECinhv, worker, c =Ca x ET x (1/TCF) x EF x EDworker

ATc

ECinhv, worker, nc =Ca x ET x (1/TCF) x EF x EDworker

ATnc, worker

Lodi, California


EQUATIONS USED TO CALCULATE EXPOSURE CONCENTRATIONS AND CHRONIC DAILY INTAKES:COMMERCIAL WORKER SCENARIO


TABLE 6

Lodi, California

Where:ATc = Averaging Time for Carcinogenic Compounds [days]ATnc = Averaging Time for Noncarcinogenic Compounds [days]

Ca = Concentration of Chemical in Air [mg/m3]Cs = Concentration of Chemical in Soil [mg/kg]Csg = Concentration of Chemical in Soil Gas [mg/m3]

ECinhp = Exposure Concentration: Soil Particulate Inhalation [mgchemical/m3

air]ECinhv = Exposure Concentration: Vapor Inhalation [mgchemical/m

3air]

ED = Exposure Duration [years]EF = Exposure Frequency [days/year]ET = Exposure Time [hours/day]

PEF = Soil-to-Air Particulate Emission Factor [m3/kg ]TCF = Time Conversion Factor [hours/day]TF = Soil Gas-to-Air Transfer Factor [mg/m3]/[mg/m3]

worker = commercial worker


Off-site Commercial Worker Off-site Resident

ExposurePoint

Concentrationfor Soil

Particulate Emissions

Factor (PEF)

OutdoorAirborne

Particulate Concentration

ExposurePoint



Factor (PEF)

OutdoorAirborne


(mg/kg) a (m3/kg) (mg/m3) b (mg/kg) a (m3/kg) (mg/m3) b

Volatile Organic CompoundsBenzene 1.4E-02 1.2E+09 1.2E-11 1.4E-02 1.2E+09 1.2E-11Ethylbenzene 6.1E-02 1.2E+09 5.1E-11 6.1E-02 1.2E+09 5.1E-11Toluene 1.0E-01 1.2E+09 8.4E-11 1.0E-01 1.2E+09 8.4E-11m,p-Xylene 3.9E-01 1.2E+09 3.3E-10 3.9E-01 1.2E+09 3.3E-10o-Xylene 1.7E-01 1.2E+09 1.4E-10 1.7E-01 1.2E+09 1.4E-10Polycyclic Aromatic Hydrocarbons1-Methylnaphthalene 1.8E-01 1.2E+09 1.5E-10 1.8E-01 1.2E+09 1.5E-102-Methylnaphthalene 2.5E-01 1.2E+09 2.1E-10 2.5E-01 1.2E+09 2.1E-10Acenaphthene 1.6E-01 1.2E+09 1.4E-10 1.6E-01 1.2E+09 1.4E-10Acenaphthylene 3.0E+00 1.2E+09 2.5E-09 3.0E+00 1.2E+09 2.5E-09Anthracene 1.8E+00 1.2E+09 1.5E-09 1.8E+00 1.2E+09 1.5E-09Benzo (a) anthracene 1.6E+01 1.2E+09 1.4E-08 1.6E+01 1.2E+09 1.4E-08Benzo (a) pyrene 4.5E+01 1.2E+09 3.7E-08 4.5E+01 1.2E+09 3.7E-08Benzo (b) fluoranthene 5.6E+01 1.2E+09 4.7E-08 5.6E+01 1.2E+09 4.7E-08Benzo (g,h,i) perylene 6.1E+01 1.2E+09 5.1E-08 6.1E+01 1.2E+09 5.1E-08Benzo (k) fluoranthene 3.3E+01 1.2E+09 2.7E-08 3.3E+01 1.2E+09 2.7E-08Chrysene 3.5E+01 1.2E+09 3.0E-08 3.5E+01 1.2E+09 3.0E-08Dibenz (a,h) Anthracene 2.1E+00 1.2E+09 1.8E-09 2.1E+00 1.2E+09 1.8E-09Fluoranthene 1.2E+02 1.2E+09 9.8E-08 1.2E+02 1.2E+09 9.8E-08Fluorene 9.7E-01 1.2E+09 8.1E-10 9.7E-01 1.2E+09 8.1E-10Indeno (1,2,3-c,d) pyrene 4.8E+01 1.2E+09 4.0E-08 4.8E+01 1.2E+09 4.0E-08

TABLE 7EXPOSURE POINT AND PREDICTED OUTDOOR AIR CONCENTRATIONS FOR

CHEMICALS OF POTENTIAL CONCERN IN EXPOSED SOILS:CURRENT OFF-SITE RESIDENTIAL AND COMMERCIAL SCENARIOS


Chemical



ExposurePoint



Factor (PEF)

OutdoorAirborne


ExposurePoint



Factor (PEF)

OutdoorAirborne






ChemicalNaphthalene 2.7E+01 1.2E+09 2.2E-08 2.7E+01 1.2E+09 2.2E-08Phenanthrene 7.6E+01 1.2E+09 6.3E-08 7.6E+01 1.2E+09 6.3E-08Pyrene 1.3E+02 1.2E+09 1.1E-07 1.3E+02 1.2E+09 1.1E-07

Benzo(a)pyrene Equivalent 4.8E+01 1.2E+09 4.0E-08 4.8E+01 1.2E+09 4.0E-08InorganicsAmmonia (as N) 3.1E+02 1.2E+09 2.6E-07 3.1E+02 1.2E+09 2.6E-07Antimony 7.7E+00 1.2E+09 6.4E-09 7.7E+00 1.2E+09 6.4E-09Barium 1.1E+02 1.2E+09 9.0E-08 1.1E+02 1.2E+09 9.0E-08Beryllium 2.2E-01 1.2E+09 1.8E-10 2.2E-01 1.2E+09 1.8E-10Cadmium 5.6E-01 1.2E+09 4.6E-10 5.6E-01 1.2E+09 4.6E-10Chromium 1.8E+01 1.2E+09 1.5E-08 1.8E+01 1.2E+09 1.5E-08Cobalt 5.9E+00 1.2E+09 5.0E-09 5.9E+00 1.2E+09 5.0E-09Copper 4.9E+01 1.2E+09 4.1E-08 4.9E+01 1.2E+09 4.1E-08Cyanide, Total 2.8E+00 1.2E+09 2.4E-09 2.8E+00 1.2E+09 2.4E-09Lead 1.3E+03 1.2E+09 1.1E-06 1.3E+03 1.2E+09 1.1E-06Mercury 2.3E-01 1.2E+09 1.9E-10 2.3E-01 1.2E+09 1.9E-10Molybdenum 4.1E+00 1.2E+09 3.4E-09 4.1E+00 1.2E+09 3.4E-09Nickel 5.2E+02 1.2E+09 4.4E-07 5.2E+02 1.2E+09 4.4E-07Silver 2.7E-01 1.2E+09 2.3E-10 2.7E-01 1.2E+09 2.3E-10Thallium 7.8E+00 1.2E+09 6.5E-09 7.8E+00 1.2E+09 6.5E-09




ExposurePoint



Factor (PEF)

OutdoorAirborne


ExposurePoint



Factor (PEF)

OutdoorAirborne






ChemicalVanadium 5.0E+01 1.2E+09 4.2E-08 5.0E+01 1.2E+09 4.2E-08Zinc 1.1E+02 1.2E+09 9.2E-08 1.1E+02 1.2E+09 9.2E-08Notes:a

b

The exposure point concentrations (EPCs) for exposed soil (0-0.5 feet bgs) dataset are used for the evaluation of outdoor air particulates. Unless otherwise indicated, the 95% upper confidence limit of the arithmetic mean concentrations (95% UCLs) of exposed soil (0-0.5 feet bgs) dataset are used as the representative EPCs. Maximum detected concentrations are bolded and italized.Outdoor air particulate concentration is calculated by dividing the soil EPC by the PEF.


On-site Resident

ExposurePoint

Concentrationfor On-site Soil


Factor (PEF)

OutdoorAirborne


(mg/kg) a (m3/kg) (mg/m3) b

Volatile Organic CompoundsBenzene 7.1E+01 1.2E+09 5.9E-08Ethylbenzene 5.0E+01 1.2E+09 4.2E-08Toluene 4.1E-02 1.2E+09 3.4E-11m,p-Xylene 5.8E-01 1.2E+09 4.8E-10o-Xylene 2.0E-01 1.2E+09 1.6E-10Polycyclic Aromatic Hydrocarbons1-Methylnaphthalene 7.8E-02 1.2E+09 6.5E-112-Methylnaphthalene 3.4E+01 1.2E+09 2.9E-08Acenaphthene 3.6E-01 1.2E+09 3.0E-10Acenaphthylene 1.2E+02 1.2E+09 9.8E-08Anthracene 6.3E+01 1.2E+09 5.3E-08Benzo (a) anthracene 1.1E+02 1.2E+09 9.0E-08Benzo (a) pyrene 2.4E+02 1.2E+09 2.0E-07Benzo (b) fluoranthene 1.4E+02 1.2E+09 1.2E-07Benzo (g,h,i) perylene 3.2E+02 1.2E+09 2.6E-07Benzo (k) fluoranthene 1.4E+02 1.2E+09 1.2E-07Chrysene 1.5E+02 1.2E+09 1.2E-07Dibenz (a,h) Anthracene 1.2E+00 1.2E+09 9.6E-10Fluoranthene 6.2E+02 1.2E+09 5.1E-07Fluorene 3.7E+01 1.2E+09 3.1E-08Indeno (1,2,3-c,d) pyrene 2.2E+02 1.2E+09 1.8E-07Naphthalene 6.1E+02 1.2E+09 5.1E-07Phenanthrene 4.5E+02 1.2E+09 3.8E-07Pyrene 6.5E+02 1.2E+09 5.4E-07

Benzo(a)pyrene Equivalent 2.3E+02 1.2E+09 1.9E-07InorganicsAmmonia (as N) 2.3E+02 1.2E+09 1.9E-07Antimony 1.9E+00 1.2E+09 1.6E-09Barium 1.0E+02 1.2E+09 8.4E-08Beryllium 2.3E-01 1.2E+09 1.9E-10Cadmium 5.7E-01 1.2E+09 4.8E-10Chromium 9.5E+00 1.2E+09 8.0E-09Cobalt 8.0E+00 1.2E+09 6.6E-09Copper 1.9E+01 1.2E+09 1.6E-08Cyanide, Total 1.5E+00 1.2E+09 1.3E-09Lead 6.3E+02 1.2E+09 5.3E-07Mercury 6.3E-02 1.2E+09 5.3E-11Molybdenum 7.3E-01 1.2E+09 6.1E-10Nickel 1.2E+02 1.2E+09 9.7E-08Silver 2.8E-01 1.2E+09 2.3E-10Thallium 7.8E+00 1.2E+09 6.5E-09



CHEMICALS OF POTENTIAL CONCERN IN SOILS:FUTURE ON-SITE RESIDENTIAL SCENARIO


Chemical


On-site Resident

ExposurePoint

Concentrationfor On-site Soil


Factor (PEF)

OutdoorAirborne


(mg/kg) a (m3/kg) (mg/m3) b


CHEMICALS OF POTENTIAL CONCERN IN SOILS:FUTURE ON-SITE RESIDENTIAL SCENARIO


ChemicalVanadium 3.4E+01 1.2E+09 2.8E-08Zinc 7.2E+01 1.2E+09 6.0E-08

Notes:a

b

The exposure point concentrations (EPCs) for on-site soil (0-10 feet bgs) dataset are used for the evaluation of direct contact exposure pathways (i.e., ingestion and dermal contact) and inhalation of outdoor air particulates. Unless otherwise indicated, the 95% upper confidence limit of the arithmetic mean concentrations (95% UCLs) of on-site soil (0-10 feet bgs) dataset are used as the representative EPCs. Maximum detected concentrations are bolded and italized.Outdoor air particulate concentration is calculated by dividing the soil EPC by the PEF.


VOC? a

Diffusivity in air, Da

(cm2/s)

Henry's Law Constant at Reference

Temperature (25° C),

H (atm-m3/mol)

Organic Carbon

Partition Coefficient,

Koc

(cm3/g)

Pure Component Water Solubility,

S (mg/L)

Soil SaturationConcentration,Csat , calculated

(mg/kg)Volatile Organic Compounds1,1-Difluoroethane Y 1.0E-01 2 1.2E-05 2 2.0E-02 2 8.3E-01 2 3.2E+01 2 3.2E+03 2 4.6E+03 3 1.4E+031,2,4-Trimethylbenzene Y 6.1E-02 1 7.9E-06 1 6.1E-03 1 2.5E-01 1 1.4E+03 1 5.7E+01 1 2.4E+00 2 4.7E+021,3,5-Trimethylbenzene Y 6.0E-02 1 8.7E-06 1 5.9E-03 1 2.4E-01 1 1.4E+03 1 2.0E+00 1 3.3E+00 2 1.7E+012-Butanone (Methyl Ethyl Ketone) Y 8.1E-02 1 9.8E-06 1 5.6E-05 1 2.3E-03 1 2.3E+00 1 2.2E+05 1 3.8E+01 1 2.5E+042-Hexanone Y 7.0E-02 2 8.4E-06 2 9.3E-05 2 3.8E-03 2 1.5E+01 2 1.7E+04 2 9.1E+01 3 3.3E+034-Ethyltoluene Y 6.8E-02 3 7.8E-06 4 5.0E-03 3 2.1E-01 3 1.8E+03 3 9.5E+01 3 3.0E+00 3 1.0E+03Acetone Y 1.2E-01 1 1.1E-05 1 3.9E-05 1 1.6E-03 1 5.8E-01 1 1.0E+06 1 5.1E+02 1 1.0E+05Benzene Y 8.8E-02 1 9.8E-06 1 5.5E-03 1 2.3E-01 1 5.9E+01 1 1.8E+03 1 9.5E+01 1 8.8E+02Carbon Disulfide Y 1.0E-01 1 1.0E-05 1 3.0E-02 1 1.2E+00 1 4.6E+01 1 1.2E+03 1 3.6E+02 1 7.1E+02Cumene Y 6.5E-02 1 7.1E-06 1 1.2E+00 1 4.7E+01 1 4.9E+02 1 6.1E+01 1 3.8E+02 1 6.9E+02Ethanol Y 1.2E-01 3 1.3E-05 4 5.0E-06 3 2.1E-04 3 1.9E-01 3 1.0E+06 3 5.9E+01 3 1.0E+05Ethylbenzene Y 7.5E-02 1 7.8E-06 1 7.9E-03 1 3.2E-01 1 3.6E+02 1 1.7E+02 1 9.5E+00 1 3.9E+02Freon 11 Y 8.7E-02 1 9.7E-06 1 9.7E-02 1 4.0E+00 1 5.0E+02 1 1.1E+03 1 5.4E+02 2 4.2E+03Freon 12 Y 6.7E-02 1 9.9E-06 1 3.4E-01 1 1.4E+01 1 4.6E+02 1 2.8E+02 1 1.8E+02 2 1.5E+03Heptane Y 7.0E-02 3 7.6E-06 4 2.0E+00 3 8.2E+01 3 1.9E+04 3 3.4E+00 3 4.6E+01 3 4.5E+02Methyl tert-butyl ether Y 1.0E-01 1 1.1E-05 1 6.2E-04 1 2.6E-02 1 7.3E+00 1 5.1E+04 1 2.4E+02 1 7.6E+03Naphthalene Y 5.9E-02 1 7.5E-06 1 4.8E-04 1 2.0E-02 1 2.0E+03 1 3.1E+01 1 8.9E-02 1 3.8E+02Propylbenzene Y 6.0E-02 1 7.8E-06 1 1.1E-02 1 4.4E-01 1 5.6E+02 1 6.0E+01 1 3.4E+00 3 2.1E+02Styrene Y 7.1E-02 1 8.0E-06 1 2.7E-03 1 1.1E-01 1 7.8E+02 1 3.1E+02 1 6.2E+00 1 1.5E+03Tetrachloroethene Y 7.2E-02 1 8.2E-06 1 1.8E-02 1 7.5E-01 1 1.6E+02 1 2.0E+02 1 1.7E+01 1 2.3E+02Toluene Y 8.7E-02 1 8.6E-06 1 6.6E-03 1 2.7E-01 1 1.8E+02 1 5.3E+02 1 2.9E+01 1 6.5E+02Trichloroethene Y 7.9E-02 1 9.1E-06 1 1.0E-02 1 4.2E-01 1 1.7E+02 1 1.5E+03 1 6.6E+01 1 1.7E+03m,p-Xylene Y 7.7E-02 1 8.4E-06 1 7.6E-03 1 3.1E-01 1 3.9E+02 1 1.9E+02 1 1.0E+01 1 4.6E+02o-Xylene Y 8.7E-02 1 1.0E-05 1 5.2E-03 1 2.1E-01 1 3.6E+02 1 1.8E+02 1 6.6E+00 1 4.1E+02Total Xylenes Y 8.5E-02 2 9.9E-06 2 5.2E-03 2 2.1E-01 2 3.8E+02 2 1.1E+02 2 6.6E+00 2 2.6E+02Polycyclic Aromatic Hydrocarbons1-Methylnaphthalene Y 5.3E-02 2 7.8E-06 2 5.1E-04 3 2.1E-02 2 2.5E+03 2 2.6E+01 2 6.7E-02 3 3.9E+022-Methylnaphthalene Y 5.2E-02 1 7.8E-06 1 5.2E-04 1 2.1E-02 1 2.8E+03 1 2.5E+01 1 6.8E-02 3 4.2E+02Acenaphthene Y 4.2E-02 1 7.7E-06 1 1.5E-04 1 6.3E-03 1 7.1E+03 1 3.6E+00 1 2.7E-03 1 1.5E+02Acenaphthylene N NA NA 1.1E-04 3 4.7E-03 3 3.6E+03 3 1.6E+01 3 9.1E-04 3 NAAnthracene N NA NA 5.6E-05 3 2.3E-03 2 2.0E+04 2 4.3E-02 2 2.7E-06 2 NA

TABLE 9CHEMICAL PROPERTIES FOR CHEMICALS OF POTENTIAL CONCERN


Chemical

Vapor Pressure, VP

(mmHg)

Diffusivity in water,

Dw

(cm2/s)

Dimensionless Henry's Law Constant at Reference


H'(unitless)


VOC? a


(cm2/s)



H (atm-m3/mol)

Organic Carbon


Koc

(cm3/g)


S (mg/L)


(mg/kg)



Chemical

Vapor Pressure, VP

(mmHg)


Dw

(cm2/s)



H'(unitless)

Benzo (a) anthracene N NA NA 1.2E-05 3 4.9E-04 2 1.8E+05 2 9.4E-03 2 1.9E-06 3 NABenzo (a) pyrene N NA NA 4.6E-07 2 1.9E-05 2 5.9E+05 2 1.6E-03 2 5.5E-09 3 NABenzo (b) fluoranthene N NA NA 1.1E-04 1 4.5E-03 1 1.2E+06 1 1.5E-03 1 5.0E-07 1 NABenzo (g,h,i) perylene N NA NA 3.3E-07 3 1.4E-05 3 1.9E+06 3 2.6E-04 3 2.4E-10 3 NABenzo (k) fluoranthene N NA NA 5.8E-07 3 2.4E-05 2 5.9E+05 2 8.0E-04 2 9.7E+10 3 NAChrysene N NA NA 9.4E-05 1 3.9E-03 1 4.0E+05 1 6.3E-03 1 2.0E-06 1 NADibenz (a,h) Anthracene N NA NA 1.4E-07 2 5.8E-06 2 1.9E+06 2 2.5E-03 2 1.0E-10 3 NAFluoranthene N NA NA 8.9E-06 3 3.6E-04 2 5.5E+04 2 2.6E-01 2 8.7E-06 3 NAFluorene N NA NA 6.3E-05 1 2.6E-03 1 1.4E+04 1 2.0E+00 1 5.7E-04 1 NAIndeno (1,2,3-c,d) pyrene N NA NA 3.5E-07 1 1.4E-05 2 2.0E+06 2 1.9E-04 2 3.5E-07 3 NANaphthalene Y 5.9E-02 1 7.5E-06 1 4.8E-04 1 2.0E-02 1 2.0E+03 1 3.1E+01 1 8.9E-02 1 3.8E+02Phenanthrene N NA NA 4.2E-05 3 1.7E-03 3 1.2E+04 3 1.2E+00 3 1.1E-04 3 NAPyrene N NA NA 1.1E-05 1 4.5E-04 1 1.1E+05 1 1.4E+00 1 5.6E-05 1 NACarcinogenic Polycyclic Aromatic HydrocarbonsBenzo(a)pyrene Equivalent N NA NA 4.6E-07 2 1.9E-05 2 5.9E+05 2 1.6E-03 2 5.5E-09 3 NAInorganicsAmmonia (as N) N NA NA 1.6E-05 3 NA 6.5E-01 3 NA NA NAAntimony N NA NA NA NA NA NA NA NABarium N NA NA NA NA NA NA NA NABeryllium N NA NA NA NA NA NA NA NACadmium N NA NA NA NA NA NA NA NAChromium N NA NA NA NA NA NA NA NACobalt N NA NA NA NA NA NA NA NACopper N NA NA NA NA NA NA NA NACyanide, Total N NA NA NA NA NA NA NA NALead N NA NA NA NA NA NA NA NAMercury N NA NA NA NA NA NA NA NAMolybdenum N NA NA NA NA NA NA NA NANickel N NA NA NA NA NA NA NA NASelenium N NA NA NA NA NA NA NA NASilver N NA NA NA NA NA NA NA NAThallium N NA NA NA NA NA NA NA NA

b


VOC? a


(cm2/s)



H (atm-m3/mol)

Organic Carbon


Koc

(cm3/g)


S (mg/L)


(mg/kg)



Chemical

Vapor Pressure, VP

(mmHg)


Dw

(cm2/s)



H'(unitless)

Vanadium N NA NA NA NA NA NA NA NAZinc N NA NA NA NA NA NA NA NA

Notes:Not applicable.

a

b

References:

1.

2.

3.

4.5.

Benzo(a)pyrene values used as surrogate.

United States Environmental Protection Agency (USEPA). 2010. From USEPA Regional Screening Levels for Chemical Contaminants at Superfund Sites, November, 2010. Available at: http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/Generic_Tables/pdf/composite_sl_table_run_NOV2010.pdf.

California Environmental Protection Department (Cal/EPA). 2005. Department of Toxic Substances Control (DTSC). Human and Ecological Risk Division (HERD). Johnson and Ettinger screening-level soil gas model contained in Excel spreadsheet “HERD_Soil_Gas_Screening_Model_2005.xls”.

USEPA. 2006. Water9, Version 3. June 29. URL: http://www.epa.gov/ttn/chief/software/water/water9_3.California Environmental Protection Agency (Cal/EPA). 1994. Preliminary Endangerment Assessment Guidance Manual. Department of Toxic Substances Control. January.

NA = VOC = Volatile organic compound. Consistent with Cal/EPA guidance, volatile chemicals are defined as having a Henry's Law Constant [atm-m 3/mol] greater than 1 x 10-5 and a vapor pressure greater than 1x10-3 (Cal/EPA 1994).

SRC PhysProp Database. 2003. found at http://esc.syrres.com/interkow/physdemo.htm and methods from Schwarzenback R. P. et al. 1993. Environmental Organic Chemistry. John Wiley and Sons, Inc., New York, NY.


(mg/m3)-1 (mg/kg-day)-1

Inhalation Source Oral Source Inhalation Source Oral Source

Volatile Organic Compounds1,1-Difluoroethane NC 1 NC 1 4.0E+01 4 NA NA1,2,4-Trimethylbenzene NC 1 NC 1 7.0E-03 2 5.0E-02 31,3,5-Trimethylbenzene NC 1 NC 1 6.0E-03 3a 1.0E-02 22-Butanone (Methyl Ethyl Ketone) NC 1 NC 1 5.0E+00 4 6.0E-01 42-Hexanone NC 1 NC 1 3.0E-02 4 5.0E-03 44-Ethyltoluene NC 1 NC 1 1.0E-01 4b 2.0E-01 4bAcetone NC 1 NC 1 3.1E+01 6 9.0E-01 4Benzene 2.9E-02 1 1.0E-01 1 3.0E-02 4 4.0E-03 4Carbon Disulfide NC 1 NC 1 7.0E-01 4 1.0E-01 4Cumene NC 1 NC 1 4.0E-01 4 1.0E-01 4Ethanol NC 1 NC 1 1.1E+00 4a 3.0E-01 4cEthylbenzene 2.5E-03 1 1.1E-02 1 1.0E+00 4 1.0E-01 4Freon 11 NC 1 NC 1 7.0E-01 5 3.0E-01 4Freon 12 NC 1 NC 1 2.0E-01 5 2.0E-01 4Heptane NC 1 NC 1 7.0E-01 4d 6.0E-02 5dMethyl tert-butyl ether 2.6E-04 1 1.8E-03 1 3.0E+00 4 8.6E-01 4aNaphthalene 3.4E-02 1 1.2E-01 1a 3.0E-03 4 2.0E-02 4Propylbenzene NC 1 NC 1 1.0E+00 6 1.0E-01 6Styrene NC 1 NC 1 9.0E-01 1 2.0E-01 4Tetrachloroethene 5.9E-03 1 5.4E-01 1 3.5E-02 1 1.0E-02 4Toluene NC 1 NC 1 3.0E-01 1 8.0E-02 4Trichloroethene 2.0E-03 1 5.9E-03 1 6.0E-01 1 3.0E-04 7m,p-Xylene NC 1 NC 1 1.0E-01 4 2.0E-01 4o-Xylene NC 1 NC 1 1.0E-01 4 2.0E-01 4Total Xylenes NC 1 NC 1 1.0E-01 4 2.0E-01 4Polycyclic Aromatic Hydrocarbons1-Methylnaphthalene NC 1 2.9E-02 1 1.4E-02 4a 4.0E-03 4e2-Methylnaphthalene NC 1 NC 1 1.4E-02 4a 4.0E-03 4Acenaphthene NC 1 NC 1 2.1E-01 4a 6.0E-02 4Acenaphthylene NC 1 NC 1 2.1E-01 4f 6.0E-02 4fAnthracene NC 1 NC 1 1.1E+00 4a 3.0E-01 4Benzo (a) anthracene na 1 na 1 1.1E-01 4g 3.0E-02 4gBenzo (a) pyrene na 1 na 1 1.1E-01 4g 3.0E-02 4gBenzo (b) fluoranthene na 1 na 1 1.1E-01 4g 3.0E-02 4gBenzo (g,h,i) perylene NC 1 NC 1 1.1E-01 4g 3.0E-02 4gBenzo (k) fluoranthene na 1 na 1 1.1E-01 4g 3.0E-02 4gChrysene na 1 na 1 1.1E-01 4g 3.0E-02 4gDibenz (a,h) Anthracene na 1 na 1 1.1E-01 4g 3.0E-02 4gFluoranthene NC 1 NC 1 1.4E-01 4a 4.0E-02 4Fluorene NC 1 NC 1 1.4E-01 4a 4.0E-02 4Indeno (1,2,3-c,d) pyrene na 1 na 1 1.1E-01 4g 3.0E-02 4gNaphthalene 3.4E-02 1 1.2E-01 1a 3.0E-03 4 2.0E-02 4Phenanthrene NC 1 NC 1 1.1E+00 4h 3.0E-01 4hPyrene NC 1 NC 1 1.1E-01 4a 3.0E-02 4

Benzo(a)pyrene Equivalent 1.1E+00 1 1.2E+01 1 NA na NA naInorganicsAmmonia (as N) NC 1 NC 1 1.0E-01 4 2.0E-01 4iAntimony NC 1 NC 1 1.4E-03 4a 4.0E-04 4Barium NC 1 NC 1 5.0E-04 5 2.0E-01 4Beryllium 2.4E+00 1 NC j 7.0E-06 1 2.0E-04 1

TABLE 10CARCINOGENIC AND NONCARCINOGENIC TOXICITY VALUES FOR CHEMICALS OF POTENTIAL CONCERN


(mg/kg-day)

Chronic Noncancer Reference Concentration

(RfC) (mg/m3)


Chemical

Lodi, California

Unit Risk Factor (URF)

Cancer Slope Factor (CSF)

Chronic Noncancer Reference Dose

(RfD)


(mg/m3)-1 (mg/kg-day)-1

Inhalation Source Oral Source Inhalation Source Oral Source

TABLE 10CARCINOGENIC AND NONCARCINOGENIC TOXICITY VALUES FOR CHEMICALS OF POTENTIAL CONCERN


(mg/kg-day)

Chronic Noncancer Reference Concentration

(RfC) (mg/m3)

Chemical

Lodi, California

Unit Risk Factor (URF)

Cancer Slope Factor (CSF)

Chronic Noncancer Reference Dose

(RfD)

Cadmium 4.2E+00 1 NC j 2.0E-05 1 5.0E-04 1Chromium NC 1k NC 1k 5.3E+00 4a,k 1.5E+00 4kCobalt 9.0E+00 2 NC 1 6.0E-06 2 3.0E-04 2Copper NC 1 NC 1 1.4E-01 5a 4.0E-02 5lCyanide, Total NC 1 NC 1 8.0E-04 4a 6.0E-04 4Lead NA m NA m NA m NA mMercury NC 1 NC 1 3.0E-05 1 1.6E-04 1Molybdenum NC 1 NC 1 1.8E-02 4a 5.0E-03 4Nickel 2.6E-01 1 NC j 5.0E-05 1 2.0E-02 4Silver NC 1 NC 1 1.8E-02 4a 5.0E-03 4Thallium NC 1 NC 1 2.3E-04 4n 6.6E-05 4nVanadium NC 1 NC 1 1.8E-02 6a 5.0E-03 6Zinc NC 1 NC 1 1.1E+00 4a 3.0E-01 4

1 1 03Notes:

a

b

c

d

e

f

g

h

i

j

k

l

m

n

Sources:1.

2.

3.

4.

5.

6.

7.

NA =

Surrogate value - assumes toxicity for xylenes.Route-to-route extrapolation.

NC = na =

Not available or not applicable.Not considered to be a carcinogen.Carcinogenic PAHs (CPAHs) evalauted using benzo(a)pyrene equivalency method.

The RfD for copper is based on drinking water standard of 1.3 mg/L.

Surrogate value - assumes toxicity for n-hexane.Surrogate value - assumes toxicity for 2-methylnaphthalene.

Surrogate value - assumes toxicity for ammonia sulfamate.Surrogate value - assumes toxicity for anthracene.

This chemical is not considered a carcinogen by the route of ingestion.

United States Environmental Protection Agency (USEPA). 2011. Integrated Risk Information System Database. Maintained at http://www.epa.gov/iris/index.html.

United States Environmental Protection Agency (USEPA) 2004. Region IX Preliminary Remediation Goals. November. Found at http://www.epa.gov/region9/superfund/prg/files/04prgtable.pdf

Value withdrawn from USEPA IRIS database on September 30, 2009.

Toxicity values for Chromium (III).

Lead exposure is evaluated using Cal/EPA OEHHA's benchmark approach. See text for details.

United States Environmental Protection Agency (USEPA). 2010. From USEPA Regional Screening Levels for Chemical Contaminants at Superfund Sites , Nov, 2010. Available at: http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/Generic_Tables/pdf/composite_sl_table_run_NOV2010.pdfNCEA. National Center for Environmental Assessment from Region IX PRG table.

United States Environmental Protection Agency (USEPA). 1997. Health Effects Assessment Summary Tables. FY 1997 Update. July. Office of Environmental Health Hazard Assessment (OEHHA).

California Environmental Protection Agency (Cal/EPA), Office of Environmental Health Hazard Assessment (OEHHA). 2011. Table of cancer slope factors maintained at http://www.oehha.ca.gov/risk/pdf/tcdb072109alpha.pdf (dated 7/21/09); table of chronic RELs maintained online at http://www.oehha.ca.gov/air/allrels.html.Superfund Health Risk Technical Support Center (STSC). 2010. STSC's Provisional Peer Reviewed Toxicity Values (PPRTV) from USEPA Regional Screening Levels for Chemical Contaminants at Superfund Sites , Novemeber, 2010.

Surrogate value - assumes toxicity for butanol.

Surrogate value - assumes toxicity for acenaphthene.Because the USEPA has not developed an RfD for this chemical, the noncancer RfD for pyrene is used as a surrogate value.


Off-site Commercial Worker

Off-site Resident, Age-Adjusted

Soil Pathway

EC:Particulate Inhalation

(mg/m3)


(mg/m3)

Volatile Organic CompoundsBenzene 9.6E-13 4.8E-12Ethylbenzene 4.1E-12 2.1E-11Toluene NC NCm,p-Xylene NC NCo-Xylene NC NCPolycyclic Aromatic Hydrocarbons1-Methylnaphthalene NC NC2-Methylnaphthalene NC NCAcenaphthene NC NCAcenaphthylene NC NCAnthracene NC NCBenzo (a) anthracene NA NABenzo (a) pyrene NA NABenzo (b) fluoranthene NA NABenzo (g,h,i) perylene NC NCBenzo (k) fluoranthene NA NAChrysene NA NADibenz (a,h) Anthracene NA NAFluoranthene NC NCFluorene NC NCIndeno (1,2,3-c,d) pyrene NA NANaphthalene 1.8E-09 9.2E-09Phenanthrene NC NCPyrene NC NC

Benzo(a)pyrene Equivalent 3.2E-09 1.6E-08InorganicsAmmonia (as N) NC NCAntimony NC NCBarium NC NCBeryllium 1.5E-11 7.4E-11Cadmium 3.8E-11 1.9E-10Chromium NC NCCobalt 4.0E-10 2.0E-09Copper NC NCCyanide, Total NC NC


ChemicalSoil Pathway

EXPOSURE CONCENTRATION AND CHRONIC DAILY INTAKES FOR TABLE 11

CARCINOGENS IN EXPOSED SOILS:CURRENT OFF-SITE RESIDENTIAL AND COMMERCIAL SCENARIOS





Soil Pathway


(mg/m3)


(mg/m3)



CARCINOGENS IN EXPOSED SOILS:CURRENT OFF-SITE RESIDENTIAL AND COMMERCIAL SCENARIOS


Lead NA NAMercury NC NCMolybdenum NC NCNickel 3.5E-08 1.8E-07Silver NC NCThallium NC NCVanadium NC NCZinc NC NC

Notes:

NC =

Chronic Daily Intake.Exposure ConcentrationNot applicable. Carcinogenic PAHs are evaluated using benzo(a)pyrene equivalents, and potential exposure to lead is evaluated using Cal/EPA OEHHA's CHHSL for lead. Please see Not considered a carcinogen.

CDI = EC = NA =



Off-site Resident Child

Off-site Resident Adult

Soil Pathway


(mg/m3)


(mg/m3)


(mg/m3)

Volatile Organic CompoundsBenzene 2.7E-12 1.1E-11 1.1E-11Ethylbenzene 1.2E-11 4.9E-11 4.9E-11Toluene 1.9E-11 8.1E-11 8.1E-11m,p-Xylene 7.4E-11 3.1E-10 3.1E-10o-Xylene 3.2E-11 1.4E-10 1.4E-10Polycyclic Aromatic Hydrocarbons1-Methylnaphthalene 3.4E-11 1.4E-10 1.4E-102-Methylnaphthalene 4.7E-11 2.0E-10 2.0E-10Acenaphthene 3.1E-11 1.3E-10 1.3E-10Acenaphthylene 5.7E-10 2.4E-09 2.4E-09Anthracene 3.4E-10 1.4E-09 1.4E-09Benzo (a) anthracene 3.1E-09 1.3E-08 1.3E-08Benzo (a) pyrene 8.5E-09 3.6E-08 3.6E-08Benzo (b) fluoranthene 1.1E-08 4.5E-08 4.5E-08Benzo (g,h,i) perylene 1.2E-08 4.9E-08 4.9E-08Benzo (k) fluoranthene 6.2E-09 2.6E-08 2.6E-08Chrysene 6.8E-09 2.8E-08 2.8E-08Dibenz (a,h) Anthracene 4.1E-10 1.7E-09 1.7E-09Fluoranthene 2.2E-08 9.4E-08 9.4E-08Fluorene 1.8E-10 7.7E-10 7.7E-10Indeno (1,2,3-c,d) pyrene 9.1E-09 3.8E-08 3.8E-08Naphthalene 5.1E-09 2.1E-08 2.1E-08Phenanthrene 1.4E-08 6.1E-08 6.1E-08Pyrene 2.5E-08 1.1E-07 1.1E-07InorganicsAmmonia (as N) 5.9E-08 2.5E-07 2.5E-07Antimony 1.5E-09 6.1E-09 6.1E-09Barium 2.1E-08 8.6E-08 8.6E-08Beryllium 4.1E-11 1.7E-10 1.7E-10Cadmium 1.1E-10 4.5E-10 4.5E-10Chromium 3.5E-09 1.5E-08 1.5E-08Cobalt 1.1E-09 4.8E-09 4.8E-09Copper 9.3E-09 3.9E-08 3.9E-08Cyanide, Total 5.4E-10 2.3E-09 2.3E-09

NONCARCINOGENS IN EXPOSED SOILS:

Lodi, California

TABLE 12EXPOSURE CONCENTRATION AND CHRONIC DAILY INTAKES FOR

CURRENT OFF-SITE RESIDENTIAL AND COMMERCIAL SCENARIOSFormer Lodi Manufactured Gas Plant

Soil Pathway Soil PathwayChemical





Soil Pathway


(mg/m3)


(mg/m3)


(mg/m3)

NONCARCINOGENS IN EXPOSED SOILS:

Lodi, California

TABLE 12EXPOSURE CONCENTRATION AND CHRONIC DAILY INTAKES FOR



Lead NA NA NAMercury 4.4E-11 1.9E-10 1.9E-10Molybdenum 7.7E-10 3.2E-09 3.2E-09Nickel 9.9E-08 4.2E-07 4.2E-07Silver 5.2E-11 2.2E-10 2.2E-10Thallium 1.5E-09 6.2E-09 6.2E-09Vanadium 9.5E-09 4.0E-08 4.0E-08Zinc 2.1E-08 8.8E-08 8.8E-08

Notes:CDI = EC = NA =

Chronic Daily Intake.Exposure ConcentrationNot applicable. Potential exposure to lead is evaluated using Cal/EPA OEHHA's CHHSL for lead. Please see text for discussion.


On-site Resident, Age-Adjusted


(mg/m3)

CDI:Dermal Contact

(mg/kg-day)

CDI:Ingestion

(mg/kg-day)

Volatile Organic CompoundsBenzene 2.4E-08 3.6E-05 1.1E-04Ethylbenzene 1.7E-08 2.5E-05 7.8E-05Toluene NC NC NCm,p-Xylene NC NC NCo-Xylene NC NC NCPolycyclic Aromatic Hydrocarbons1-Methylnaphthalene NC 3.9E-08 1.2E-072-Methylnaphthalene NC NC NCAcenaphthene NC NC NCAcenaphthylene NC NC NCAnthracene NC NC NCBenzo (a) anthracene NA NA NABenzo (a) pyrene NA NA NABenzo (b) fluoranthene NA NA NABenzo (g,h,i) perylene NC NC NCBenzo (k) fluoranthene NA NA NAChrysene NA NA NADibenz (a,h) Anthracene NA NA NAFluoranthene NC NC NCFluorene NC NC NCIndeno (1,2,3-c,d) pyrene NA NA NANaphthalene 2.1E-07 4.6E-04 9.5E-04Phenanthrene NC NC NCPyrene NC NC NC

Benzo(a)pyrene Equivalent 7.9E-08 1.8E-04 3.6E-04InorganicsAmmonia (as N) NC NC NCAntimony NC NC NCBarium NC NC NCBeryllium 8.0E-11 NC NCCadmium 2.0E-10 NC NCChromium NC NC NCCobalt 2.7E-09 NC NCCopper NC NC NCCyanide, Total NC NC NC



CARCINOGENS IN SOILS:FUTURE ON-SITE RESIDENTIAL SCENARIO






(mg/m3)

CDI:Dermal Contact

(mg/kg-day)

CDI:Ingestion

(mg/kg-day)



CARCINOGENS IN SOILS:FUTURE ON-SITE RESIDENTIAL SCENARIO


Lead NA NA NAMercury NC NC NCMolybdenum NC NC NCNickel 4.0E-08 NC NCSilver NC NC NCThallium NC NC NCVanadium NC NC NCZinc NC NC NC

Notes:

NC =

Chronic Daily Intake.Exposure ConcentrationNot applicable. Carcinogenic PAHs are evaluated using benzo(a)pyrene equivalents, and potential exposure to lead is evaluated using Cal/EPA OEHHA's CHHSL for lead. Please see text for discussion.Not considered a carcinogen.

CDI = EC = NA =


On-site Resident Child On-site Resident Adult

EC:Particulate Inhalation(mg/m3)

CDI:Dermal Contact

(mg/kg-day)

CDI:Ingestion

(mg/kg-day)


CDI:Dermal Contact

(mg/kg-day)

CDI:Ingestion

(mg/kg-day)

Volatile Organic CompoundsBenzene 5.6E-08 2.6E-04 9.0E-04 5.6E-08 3.9E-05 9.7E-05Ethylbenzene 4.0E-08 1.9E-04 6.4E-04 4.0E-08 2.7E-05 6.8E-05Toluene 3.2E-11 1.5E-07 5.2E-07 3.2E-11 2.2E-08 5.5E-08m,p-Xylene 4.6E-10 2.2E-06 7.4E-06 4.6E-10 3.2E-07 7.9E-07o-Xylene 1.6E-10 7.3E-07 2.5E-06 1.6E-10 1.1E-07 2.7E-07Polycyclic Aromatic Hydrocarbons1-Methylnaphthalene 6.2E-11 2.9E-07 1.0E-06 6.2E-11 4.3E-08 1.1E-072-Methylnaphthalene 2.8E-08 1.3E-04 4.4E-04 2.8E-08 1.9E-05 4.7E-05Acenaphthene 2.8E-10 2.0E-06 4.6E-06 2.8E-10 2.9E-07 4.9E-07Acenaphthylene 9.4E-08 6.6E-04 1.5E-03 9.4E-08 9.7E-05 1.6E-04Anthracene 5.1E-08 3.5E-04 8.1E-04 5.1E-08 5.2E-05 8.7E-05Benzo (a) anthracene 8.6E-08 6.0E-04 1.4E-03 8.6E-08 8.9E-05 1.5E-04Benzo (a) pyrene 1.9E-07 1.3E-03 3.0E-03 1.9E-07 1.9E-04 3.3E-04Benzo (b) fluoranthene 1.1E-07 8.0E-04 1.8E-03 1.1E-07 1.2E-04 2.0E-04Benzo (g,h,i) perylene 2.5E-07 1.8E-03 4.0E-03 2.5E-07 2.6E-04 4.3E-04Benzo (k) fluoranthene 1.2E-07 8.0E-04 1.8E-03 1.2E-07 1.2E-04 2.0E-04Chrysene 1.2E-07 8.1E-04 1.9E-03 1.2E-07 1.2E-04 2.0E-04Dibenz (a,h) Anthracene 9.2E-10 6.4E-06 1.5E-05 9.2E-10 9.4E-07 1.6E-06Fluoranthene 4.9E-07 3.4E-03 7.9E-03 4.9E-07 5.1E-04 8.5E-04Fluorene 3.0E-08 2.1E-04 4.7E-04 3.0E-08 3.0E-05 5.1E-05Indeno (1,2,3-c,d) pyrene 1.8E-07 1.2E-03 2.8E-03 1.8E-07 1.8E-04 3.0E-04Naphthalene 4.9E-07 3.4E-03 7.8E-03 4.9E-07 5.0E-04 8.3E-04Phenanthrene 3.6E-07 2.5E-03 5.8E-03 3.6E-07 3.7E-04 6.2E-04Pyrene 5.2E-07 3.6E-03 8.2E-03 5.2E-07 5.3E-04 8.8E-04InorganicsAmmonia (as N) 1.8E-07 8.5E-04 2.9E-03 1.8E-07 1.3E-04 3.2E-04Antimony 1.5E-09 7.0E-07 2.4E-05 1.5E-09 1.0E-07 2.6E-06Barium 8.1E-08 3.8E-05 1.3E-03 8.1E-08 5.5E-06 1.4E-04Beryllium 1.9E-10 8.6E-08 3.0E-06 1.9E-10 1.3E-08 3.2E-07Cadmium 4.6E-10 2.1E-08 7.3E-06 4.6E-10 3.1E-09 7.9E-07Chromium 7.6E-09 3.5E-06 1.2E-04 7.6E-09 5.2E-07 1.3E-05Cobalt 6.4E-09 3.0E-06 1.0E-04 6.4E-09 4.4E-07 1.1E-05Copper 1.5E-08 7.1E-06 2.5E-04 1.5E-08 1.1E-06 2.6E-05Cyanide, Total 1.2E-09 5.6E-06 1.9E-05 1.2E-09 8.3E-07 2.1E-06

Lodi, California

TABLE 14EXPOSURE CONCENTRATION AND CHRONIC DAILY INTAKES FOR NONCARCINOGENS IN SOILS:

FUTURE ON-SITE RESIDENTIAL SCENARIOFormer Lodi Manufactured Gas Plant



On-site Resident Child On-site Resident Adult


CDI:Dermal Contact

(mg/kg-day)

CDI:Ingestion

(mg/kg-day)


CDI:Dermal Contact

(mg/kg-day)

CDI:Ingestion

(mg/kg-day)

Lodi, California

TABLE 14EXPOSURE CONCENTRATION AND CHRONIC DAILY INTAKES FOR NONCARCINOGENS IN SOILS:



Lead NA NA NA NA NA NAMercury 5.1E-11 2.3E-08 8.1E-07 5.1E-11 3.5E-09 8.7E-08Molybdenum 5.9E-10 2.7E-07 9.4E-06 5.9E-10 4.0E-08 1.0E-06Nickel 9.3E-08 4.3E-05 1.5E-03 9.3E-08 6.4E-06 1.6E-04Silver 2.2E-10 1.0E-07 3.6E-06 2.2E-10 1.5E-08 3.8E-07Thallium 6.2E-09 2.9E-06 1.0E-04 6.2E-09 4.3E-07 1.1E-05Vanadium 2.7E-08 1.3E-05 4.4E-04 2.7E-08 1.9E-06 4.7E-05Zinc 5.7E-08 2.7E-05 9.2E-04 5.7E-08 3.9E-06 9.8E-05

Notes:CDI = EC = NA =

Chronic Daily Intake.Exposure ConcentrationNot applicable. Toxicity values for thallium has been withdrawn by USEPA. Potential exposure to lead is evaluated using Cal/EPA OEHHA's CHHSL for lead. Please see text for discussion.




Particulate Inhalation

Total Cancer Risk


Total Cancer Risk

Volatile Organic CompoundsBenzene 2.8E-14 2.8E-14 1.4E-13 1.4E-13Ethylbenzene 1.0E-14 1.0E-14 5.2E-14 5.2E-14Toluene NC NC NC NCm,p-Xylene NC NC NC NCo-Xylene NC NC NC NCPolycyclic Aromatic Hydrocarbons1-Methylnaphthalene NC NC NC NC2-Methylnaphthalene NC NC NC NCAcenaphthene NC NC NC NCAcenaphthylene NC NC NC NCAnthracene NC NC NC NCBenzo (a) anthracene NA NA NA NABenzo (a) pyrene NA NA NA NABenzo (b) fluoranthene NA NA NA NABenzo (g,h,i) perylene NC NC NC NCBenzo (k) fluoranthene NA NA NA NAChrysene NA NA NA NADibenz (a,h) Anthracene NA NA NA NAFluoranthene NC NC NC NCFluorene NC NC NC NCIndeno (1,2,3-c,d) pyrene NA NA NA NANaphthalene 6.2E-11 6.2E-11 3.1E-10 3.1E-10Phenanthrene NC NC NC NCPyrene NC NC NC NCCarcinogenic Polycyclic Aromatic HydrocarbonsBenzo(a)pyrene Equivalent 3.6E-09 3.6E-09 1.8E-08 1.8E-08InorganicsAntimony NC NC NC NCBarium NC NC NC NCBeryllium 3.5E-11 3.5E-11 1.8E-10 1.8E-10Cadmium 1.6E-10 1.6E-10 8.0E-10 8.0E-10Chromium NC NC NC NCCobalt 3.6E-09 3.6E-09 1.8E-08 1.8E-08Copper NC NC NC NCCyanide, Total NC NC NC NC

Chemical

Lodi, California

TABLE 15CANCER RISK FROM EXPOSED SOILS:


Soil Pathway Soil Pathway





Total Cancer Risk


Total Cancer Risk

Chemical

Lodi, California

TABLE 15CANCER RISK FROM EXPOSED SOILS:


Soil Pathway Soil Pathway

Lead NA NA NA NAMercury NC NC NC NCMolybdenum NC NC NC NCNickel 9.2E-09 9.2E-09 4.6E-08 4.6E-08Selenium NC NC NC NCSilver NC NC NC NCThallium NC NC NC NCVanadium NC NC NC NCZinc NC NC NC NCTotal Cancer Risk 1.7E-08 1.7E-08 8.4E-08 8.4E-08

Notes:

NC = Not considered a carcinogen.

NA = Not applicable. Cancer risks not calculated for chemicals not considered a carcinogen. Carcinogenic PAHs are evaluated using benzo(a)pyrene equivalents, and potential exposure to lead is evaluated using OEHHA's CHHSL for lead. Please see text for discussion.






Total Hazard Index


Total Hazard Index


Total Hazard Index

Volatile Organic CompoundsBenzene 8.9E-11 8.9E-11 3.8E-10 3.8E-10 3.8E-10 3.8E-10Ethylbenzene 1.2E-11 1.2E-11 4.9E-11 4.9E-11 4.9E-11 4.9E-11Toluene 6.4E-11 6.4E-11 2.7E-10 2.7E-10 2.7E-10 2.7E-10m,p-Xylene 7.4E-10 7.4E-10 3.1E-09 3.1E-09 3.1E-09 3.1E-09o-Xylene 3.2E-10 3.2E-10 1.4E-09 1.4E-09 1.4E-09 1.4E-09Polycyclic Aromatic Hydrocarbons1-Methylnaphthalene 2.4E-09 2.4E-09 1.0E-08 1.0E-08 1.0E-08 1.0E-082-Methylnaphthalene 3.4E-09 3.4E-09 1.4E-08 1.4E-08 1.4E-08 1.4E-08Acenaphthene 1.5E-10 1.5E-10 6.2E-10 6.2E-10 6.2E-10 6.2E-10Acenaphthylene 2.7E-09 2.7E-09 1.1E-08 1.1E-08 1.1E-08 1.1E-08Anthracene 3.2E-10 3.2E-10 1.3E-09 1.3E-09 1.3E-09 1.3E-09Benzo (a) anthracene 2.9E-08 2.9E-08 1.2E-07 1.2E-07 1.2E-07 1.2E-07Benzo (a) pyrene 8.1E-08 8.1E-08 3.4E-07 3.4E-07 3.4E-07 3.4E-07Benzo (b) fluoranthene 1.0E-07 1.0E-07 4.3E-07 4.3E-07 4.3E-07 4.3E-07Benzo (g,h,i) perylene 1.1E-07 1.1E-07 4.6E-07 4.6E-07 4.6E-07 4.6E-07Benzo (k) fluoranthene 5.9E-08 5.9E-08 2.5E-07 2.5E-07 2.5E-07 2.5E-07Chrysene 6.4E-08 6.4E-08 2.7E-07 2.7E-07 2.7E-07 2.7E-07Dibenz (a,h) Anthracene 3.9E-09 3.9E-09 1.6E-08 1.6E-08 1.6E-08 1.6E-08Fluoranthene 1.6E-07 1.6E-07 6.7E-07 6.7E-07 6.7E-07 6.7E-07Fluorene 1.3E-09 1.3E-09 5.5E-09 5.5E-09 5.5E-09 5.5E-09Indeno (1,2,3-c,d) pyrene 8.7E-08 8.7E-08 3.6E-07 3.6E-07 3.6E-07 3.6E-07Naphthalene 1.7E-06 1.7E-06 7.1E-06 7.1E-06 7.1E-06 7.1E-06Phenanthrene 1.4E-08 1.4E-08 5.8E-08 5.8E-08 5.8E-08 5.8E-08Pyrene 2.4E-07 2.4E-07 1.0E-06 1.0E-06 1.0E-06 1.0E-06InorganicsAntimony 1.0E-06 1.0E-06 4.4E-06 4.4E-06 4.4E-06 4.4E-06Barium 4.1E-05 4.1E-05 1.7E-04 1.7E-04 1.7E-04 1.7E-04Beryllium 5.8E-06 5.8E-06 2.5E-05 2.5E-05 2.5E-05 2.5E-05Cadmium 5.3E-06 5.3E-06 2.2E-05 2.2E-05 2.2E-05 2.2E-05Chromium 6.6E-10 6.6E-10 2.8E-09 2.8E-09 2.8E-09 2.8E-09Cobalt 1.9E-04 1.9E-04 7.9E-04 7.9E-04 7.9E-04 7.9E-04Copper 6.6E-08 6.6E-08 2.8E-07 2.8E-07 2.8E-07 2.8E-07Cyanide, Total 6.7E-07 6.7E-07 2.8E-06 2.8E-06 2.8E-06 2.8E-06

TABLE 16NONCANCER HAZARD INDICES FROM EXPOSED SOILS:


Lodi, California

Soil Pathway Soil Pathway Soil PathwayChemical






Total Hazard Index


Total Hazard Index


Total Hazard Index

TABLE 16NONCANCER HAZARD INDICES FROM EXPOSED SOILS:


Lodi, California

Soil Pathway Soil Pathway Soil PathwayChemical

Lead NA NA NA NA NA NAMercury 1.5E-06 1.5E-06 6.2E-06 6.2E-06 6.2E-06 6.2E-06Molybdenum 4.4E-08 4.4E-08 1.9E-07 1.9E-07 1.9E-07 1.9E-07Nickel 2.0E-03 2.0E-03 8.3E-03 8.3E-03 8.3E-03 8.3E-03Silver 3.0E-09 3.0E-09 1.2E-08 1.2E-08 1.2E-08 1.2E-08Thallium 6.4E-06 6.4E-06 2.7E-05 2.7E-05 2.7E-05 2.7E-05Vanadium 5.5E-07 5.5E-07 2.3E-06 2.3E-06 2.3E-06 2.3E-06Zinc 2.0E-08 2.0E-08 8.4E-08 8.4E-08 8.4E-08 8.4E-08Total Hazard Index 2.2E-03 2.2E-03 9.4E-03 9.4E-03 9.4E-03 9.4E-03

Notes:NA = Not applicable. Potential exposure to lead is evaluated using OEHHA's CHHSL for lead. Please see text for discussion.


TABLE 17RISK EVALUATION FOR LEAD IN EXPOSED SOILS:

CURRENT OFF-SITE RESIDENTIAL SCENARIOFormer Lodi Manufactured Gas Plant

Lodi, California

USER'S GUIDE to version 7

INPUT OUTPUT

MEDIUM LEVEL PRG-99 PRG-90Lead in Air (ug/m3) 0 50th 90th 95th 98th 99th (ug/g) (ug/g)

Lead in Soil/Dust (ug/g) 1,291 BLOOD Pb, ADULT 0.0 0.0 0.0 0.0 0.0 135977 188065Lead in Water (ug/l) 0 BLOOD Pb, CHILD 0.0025 0.0046 0.0 0.0 0.0 170804 279523% Home-grown Produce 0% BLOOD Pb, PICA CHILD 0.0025 0.0046 0.0 0.0 0.0 170804 279523Respirable Dust (ug/m3) 1.5 BLOOD Pb, OCCUPATIONAL 0.0 0.0 0.0 0.0 0.0 190368 263291

units adults childrenDays per week days/wk

Days per week, occupational 5 PEF ug/dl percent PEF ug/dl percentGeometric Standard Deviation Soil Contact 0.0E+0 0.00 0% 0.0E+0 0.00 0%Blood lead level of concern (ug/dl) Soil Ingestion 0.0E+0 0.00 0% 0.0E+0 0.00 0%Skin area, residential cm2 0 0 Inhalation, bkgrnd 0.00 0% 0.00 0%Skin area occupational cm2 0 Inhalation 2.5E-6 0.00 100% 1.8E-6 0.00 100%Soil adherence ug/cm2 70 200 Water Ingestion 0.00 0% 0.00 0%Dermal uptake constant (ug/dl)/(ug/day) Food Ingestion, bkgrnd 0.00 0% 0.00 0%Soil ingestion mg/day 0 0 Food Ingestion 0.0E+0 0.00 0% 0%Soil ingestion, pica mg/day 0Ingestion constant (ug/dl)/(ug/day) 0.04 0.16Bioavailability unitless

Breathing rate m3/day 20 6.8 PEF ug/dl percent PEF ug/dl percentInhalation constant (ug/dl)/(ug/day) 0.08 0.192 Soil Contact 0.0E+0 0.00 0% 0.00 0%Water ingestion l/day 1.4 0.4 Soil Ingestion 0.0E+0 0.00 0% 0.0E+0 0.00 0%Food ingestion kg/day 1.9 1.1 Inhalation 2.0E-6 0.00 100% 0.00 100%Lead in market basket ug/kg Inhalation, bkgrnd 0.00 0% 0.00 0%Lead in home-grown produce ug/kg Water Ingestion 0.00 0% 0.00 0%

Food Ingestion, bkgrnd 0.00 0% 0.00 0%Click here for REFERENCES Food Ingestion 0.0E+0 0.00 0% 0.00 0%

Pathway

0.0581.0

CHILDREN typical with pica0.44 Pathway contribution Pathway contribution

Pathway1.61

0.0001

ADULTS Residential Occupational7 Pathway contribution Pathway contribution

LEAD RISK ASSESSMENT SPREADSHEETCALIFORNIA DEPARTMENT OF TOXIC SUBSTANCES CONTROL

Percentile Estimate of Blood Pb (ug/dl)

EXPOSURE PARAMETERS PATHWAYS




Dermal Contact Ingestion

Total Cancer Risk

Volatile Organic CompoundsBenzene 7.0E-10 3.6E-06 1.1E-05 1.5E-05Ethylbenzene 4.3E-11 2.8E-07 8.6E-07 1.1E-06Toluene NC NC NC NCm,p-Xylene NC NC NC NCo-Xylene NC NC NC NCPolycyclic Aromatic Hydrocarbons1-Methylnaphthalene NC 1.1E-09 3.5E-09 4.7E-092-Methylnaphthalene NC NC NC NCAcenaphthene NC NC NC NCAcenaphthylene NC NC NC NCAnthracene NC NC NC NCBenzo (a) anthracene NA NA NA NABenzo (a) pyrene NA NA NA NABenzo (b) fluoranthene NA NA NA NABenzo (g,h,i) perylene NC NC NC NCBenzo (k) fluoranthene NA NA NA NAChrysene NA NA NA NADibenz (a,h) Anthracene NA NA NA NAFluoranthene NC NC NC NCFluorene NC NC NC NCIndeno (1,2,3-c,d) pyrene NA NA NA NANaphthalene 7.1E-09 5.5E-05 1.1E-04 1.7E-04Phenanthrene NC NC NC NCPyrene NC NC NC NCCarcinogenic Polycyclic Aromatic HydrocarbonsBenzo(a)pyrene Equivalent 8.7E-08 2.1E-03 4.4E-03 6.5E-03InorganicsAntimony NC NC NC NCBarium NC NC NC NCBeryllium 1.9E-10 NC NC 1.9E-10Cadmium 8.3E-10 NC NC 8.3E-10Chromium NC NC NC NCCobalt 2.5E-08 NC NC 2.5E-08Copper NC NC NC NCCyanide, Total NC NC NC NC

Soil PathwayChemical

Lodi, California

TABLE 18CANCER RISK FROM SOILS:






Total Cancer Risk


Lodi, California

TABLE 18CANCER RISK FROM SOILS:


Lead NA NA NA NAMercury NC NC NC NCMolybdenum NC NC NC NCNickel 1.0E-08 NC NC 1.0E-08Silver NC NC NC NCThallium NC NC NC NCVanadium NC NC NC NCZinc NC NC NC NCTotal Cancer Risk 1.3E-07 2.2E-03 4.5E-03 6.7E-03

Notes:

NC = Not considered a carcinogen.

NA = Not applicable. Cancer risks not calculated for chemicals not considered a carcinogen. Carcinogenic PAHs are evaluated using benzo(a)pyrene equivalents, and potential exposure to lead is evaluated using OEHHA's


On-site Resident Child



Total Hazard Index

Volatile Organic CompoundsBenzene 1.9E-06 6.5E-02 2.3E-01 2.9E-01Ethylbenzene 4.0E-08 1.9E-03 6.4E-03 8.2E-03Toluene 1.1E-10 1.9E-06 6.5E-06 8.3E-06m,p-Xylene 4.6E-09 1.1E-05 3.7E-05 4.8E-05o-Xylene 1.6E-09 3.7E-06 1.3E-05 1.6E-05Polycyclic Aromatic Hydrocarbons1-Methylnaphthalene 4.5E-09 7.2E-05 2.5E-04 3.2E-042-Methylnaphthalene 2.0E-06 3.2E-02 1.1E-01 1.4E-01Acenaphthene 1.4E-09 3.3E-05 7.6E-05 1.1E-04Acenaphthylene 4.5E-07 1.1E-02 2.5E-02 3.6E-02Anthracene 4.8E-08 1.2E-03 2.7E-03 3.9E-03Benzo (a) anthracene 8.2E-07 2.0E-02 4.6E-02 6.6E-02Benzo (a) pyrene 1.8E-06 4.4E-02 1.0E-01 1.5E-01Benzo (b) fluoranthene 1.1E-06 2.7E-02 6.1E-02 8.8E-02Benzo (g,h,i) perylene 2.4E-06 5.9E-02 1.3E-01 1.9E-01Benzo (k) fluoranthene 1.1E-06 2.7E-02 6.2E-02 8.8E-02Chrysene 1.1E-06 2.7E-02 6.2E-02 8.9E-02Dibenz (a,h) Anthracene 8.8E-09 2.1E-04 4.9E-04 7.0E-04Fluoranthene 3.5E-06 8.6E-02 2.0E-01 2.8E-01Fluorene 2.1E-07 5.2E-03 1.2E-02 1.7E-02Indeno (1,2,3-c,d) pyrene 1.7E-06 4.1E-02 9.3E-02 1.3E-01Naphthalene 1.6E-04 1.7E-01 3.9E-01 5.6E-01Phenanthrene 3.4E-07 8.4E-03 1.9E-02 2.8E-02Pyrene 4.9E-06 1.2E-01 2.7E-01 3.9E-01InorganicsAntimony 1.1E-06 1.7E-03 6.0E-02 6.2E-02Barium 1.6E-04 1.9E-04 6.5E-03 6.8E-03Beryllium 2.7E-05 4.3E-04 1.5E-02 1.5E-02Cadmium 2.3E-05 4.3E-05 1.5E-02 1.5E-02Chromium 1.5E-09 2.4E-06 8.1E-05 8.4E-05Cobalt 1.1E-03 9.8E-03 3.4E-01 3.5E-01Copper 1.1E-07 1.8E-04 6.2E-03 6.3E-03Cyanide, Total 1.5E-06 9.4E-03 3.2E-02 4.2E-02

TABLE 19


NONCANCER HAZARD INDICES FROM SOILS: FUTURE ON-SITE RESIDENTIAL SCENARIO



On-site Resident Child



Total Hazard Index

TABLE 19


NONCANCER HAZARD INDICES FROM SOILS: FUTURE ON-SITE RESIDENTIAL SCENARIO


Lead NA NA NA NAMercury 1.7E-06 1.5E-04 5.1E-03 5.2E-03Molybdenum 3.4E-08 5.4E-05 1.9E-03 1.9E-03Nickel 1.9E-03 2.2E-03 7.5E-02 7.9E-02Silver 1.3E-08 2.1E-05 7.2E-04 7.4E-04Thallium 2.7E-05 4.4E-02 1.5E+00 1.6E+00Vanadium 1.6E-06 2.5E-03 8.7E-02 9.0E-02Zinc 5.5E-08 8.9E-05 3.1E-03 3.2E-03Total Hazard Index 3.4E-03 8.1E-01 4.0E+00 4.8E+00

Notes:Not applicable. Potential exposure to lead is evaluated using OEHHA's CHHSL for lead. Please see text for discussion.

NA =


On-site Resident Adult



Total Hazard Index

Volatile Organic CompoundsBenzene 1.9E-06 9.6E-03 2.4E-02 3.4E-02Ethylbenzene 4.0E-08 2.7E-04 6.8E-04 9.6E-04Toluene 1.1E-10 2.8E-07 6.9E-07 9.7E-07m,p-Xylene 4.6E-09 1.6E-06 4.0E-06 5.6E-06o-Xylene 1.6E-09 5.4E-07 1.3E-06 1.9E-06Polycyclic Aromatic Hydrocarbons1-Methylnaphthalene 4.5E-09 1.1E-05 2.7E-05 3.7E-052-Methylnaphthalene 2.0E-06 4.7E-03 1.2E-02 1.7E-02Acenaphthene 1.4E-09 4.9E-06 8.1E-06 1.3E-05Acenaphthylene 4.5E-07 1.6E-03 2.7E-03 4.3E-03Anthracene 4.8E-08 1.7E-04 2.9E-04 4.6E-04Benzo (a) anthracene 8.2E-07 3.0E-03 4.9E-03 7.9E-03Benzo (a) pyrene 1.8E-06 6.5E-03 1.1E-02 1.7E-02Benzo (b) fluoranthene 1.1E-06 3.9E-03 6.5E-03 1.0E-02Benzo (g,h,i) perylene 2.4E-06 8.6E-03 1.4E-02 2.3E-02Benzo (k) fluoranthene 1.1E-06 4.0E-03 6.6E-03 1.1E-02Chrysene 1.1E-06 4.0E-03 6.7E-03 1.1E-02Dibenz (a,h) Anthracene 8.8E-09 3.1E-05 5.3E-05 8.4E-05Fluoranthene 3.5E-06 1.3E-02 2.1E-02 3.4E-02Fluorene 2.1E-07 7.6E-04 1.3E-03 2.0E-03Indeno (1,2,3-c,d) pyrene 1.7E-06 6.0E-03 1.0E-02 1.6E-02Naphthalene 1.6E-04 2.5E-02 4.2E-02 6.7E-02Phenanthrene 3.4E-07 1.2E-03 2.1E-03 3.3E-03Pyrene 4.9E-06 1.8E-02 2.9E-02 4.7E-02InorganicsAntimony 1.1E-06 2.6E-04 6.4E-03 6.7E-03Barium 1.6E-04 2.8E-05 6.9E-04 8.8E-04Beryllium 2.7E-05 6.3E-05 1.6E-03 1.7E-03Cadmium 2.3E-05 6.3E-06 1.6E-03 1.6E-03Chromium 1.5E-09 3.5E-07 8.7E-06 9.1E-06Cobalt 1.1E-03 1.5E-03 3.6E-02 3.9E-02Copper 1.1E-07 2.6E-05 6.6E-04 6.9E-04Cyanide, Total 1.5E-06 1.4E-03 3.5E-03 4.9E-03

Lodi, California


TABLE 19NONCANCER HAZARD INDICES FROM SOILS:



On-site Resident Adult



Total Hazard Index

Lodi, California


TABLE 19NONCANCER HAZARD INDICES FROM SOILS:


Lead NA NA NA NAMercury 1.7E-06 2.2E-05 5.4E-04 5.7E-04Molybdenum 3.4E-08 8.0E-06 2.0E-04 2.1E-04Nickel 1.9E-03 3.2E-04 8.0E-03 1.0E-02Silver 1.3E-08 3.1E-06 7.7E-05 8.0E-05Thallium 2.7E-05 6.5E-03 1.6E-01 1.7E-01Vanadium 1.6E-06 3.7E-04 9.3E-03 9.7E-03Zinc 5.5E-08 1.3E-05 3.3E-04 3.4E-04Total Hazard Index 3.4E-03 1.2E-01 4.3E-01 5.5E-01

Notes:NA = Not applicable. Potential exposure to lead is evaluated using OEHHA's CHHSL for lead. Please see

text for discussion.


TABLE 20RISK EVALUATION FOR LEAD IN SOILS:


Lodi, California

USER'S GUIDE to version 7

INPUT OUTPUT

MEDIUM LEVEL PRG-99 PRG-90Lead in Air (ug/m3) 0 50th 90th 95th 98th 99th (ug/g) (ug/g)

Lead in Soil/Dust (ug/g) 631 BLOOD Pb, ADULT 0.6 1.1 1.3 1.5 1.7 363 502Lead in Water (ug/l) 0 BLOOD Pb, CHILD 4.5 8.2 9.7 11.8 13.4 47 77% Home-grown Produce 0% BLOOD Pb, PICA CHILD 8.9 16.3 19.3 23.4 26.7 24 39Respirable Dust (ug/m3) 1.5 BLOOD Pb, OCCUPATIONAL 0.4 0.7 0.9 1.1 1.2 519 718

units adults childrenDays per week days/wk

Days per week, occupational 5 PEF ug/dl percent PEF ug/dl percentGeometric Standard Deviation Soil Contact 3.8E-5 0.02 4% 1.4E-5 0.01 2%Blood lead level of concern (ug/dl) Soil Ingestion 8.8E-4 0.56 96% 6.3E-4 0.40 98%Skin area, residential cm2 5700 2900 Inhalation, bkgrnd 0.00 0% 0.00 0%Skin area occupational cm2 2900 Inhalation 2.5E-6 0.00 0% 1.8E-6 0.00 0%Soil adherence ug/cm2 70 200 Water Ingestion 0.00 0% 0.00 0%Dermal uptake constant (ug/dl)/(ug/day) Food Ingestion, bkgrnd 0.00 0% 0.00 0%Soil ingestion mg/day 50 100 Food Ingestion 0.0E+0 0.00 0% 0%Soil ingestion, pica mg/day 200Ingestion constant (ug/dl)/(ug/day) 0.04 0.16Bioavailability unitless

Breathing rate m3/day 20 6.8 PEF ug/dl percent PEF ug/dl percentInhalation constant (ug/dl)/(ug/day) 0.08 0.192 Soil Contact 5.6E-5 0.04 1% 0.04 0%Water ingestion l/day 1.4 0.4 Soil Ingestion 7.0E-3 4.44 99% 1.4E-2 8.88 100%Food ingestion kg/day 1.9 1.1 Inhalation 2.0E-6 0.00 0% 0.00 0%Lead in market basket ug/kg Inhalation, bkgrnd 0.00 0% 0.00 0%Lead in home-grown produce ug/kg Water Ingestion 0.00 0% 0.00 0%

Food Ingestion, bkgrnd 0.00 0% 0.00 0%Click here for REFERENCES Food Ingestion 0.0E+0 0.00 0% 0.00 0%

LEAD RISK ASSESSMENT SPREADSHEETCALIFORNIA DEPARTMENT OF TOXIC SUBSTANCES CONTROL

Percentile Estimate of Blood Pb (ug/dl)

EXPOSURE PARAMETERS PATHWAYSADULTS Residential Occupational

7 Pathway contribution Pathway contributionPathway

1.61

0.0001

typical with pica0.44 Pathway contribution Pathway contribution

Pathway

0.0284.0

CHILDREN


Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical

Soil Gas Concentration

(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c

Exposure Point

Concentration (EPC) in

Outdoor Air (mg/m3)d

Exposure Concentration (EC)

in Outdoor Air – Cancer Effects

(mg/m3)e


in Outdoor Air– Noncancer

Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapors

in Outdoor Air(unitless)f

Noncancer Hazard

Quotient from Vapors

in Outdoor Air (unitless)f

Cumulative Cancer

Risk

Cumulative Noncancer

Hazard SG-1S SG-1 5 1,1-Difluoroethane 0.0019 6.3E-06 1.2E-08 4.9E-09 1.1E-08 NC 4.0E+01 NC 2.9E-10SG-1S SG-1 5 1,2,4-Trimethylbenzene 0.14 3.7E-06 5.2E-07 2.1E-07 5.0E-07 NC 7.0E-03 NC 7.2E-05SG-1S SG-1 5 1,3,5-Trimethylbenzene 0.066 3.7E-06 2.4E-07 1.0E-07 2.3E-07 NC 6.0E-03 NC 3.9E-05SG-1S SG-1 5 2-Butanone (Methyl Ethyl K 0.0053 5.0E-06 2.7E-08 1.1E-08 2.5E-08 NC 5.0E+00 NC 5.1E-09SG-1S SG-1 5 2-Hexanone 0.0029 4.4E-06 1.3E-08 5.2E-09 1.2E-08 NC 3.0E-02 NC 4.0E-07SG-1S SG-1 5 4-Ethyltoluene 0.16 4.2E-06 6.7E-07 2.8E-07 6.4E-07 NC 1.0E-01 NC 6.4E-06SG-1S SG-1 5 Acetone 0.068 7.7E-06 5.2E-07 2.2E-07 5.0E-07 NC 3.1E+01 NC 1.6E-08SG-1S SG-1 5 Benzene 0.0017 5.4E-06 9.2E-09 3.8E-09 8.8E-09 2.9E-02 3.0E-02 1.1E-10 2.9E-07SG-1S SG-1 5 Carbon Disulfide 0.0022 6.4E-06 1.4E-08 5.8E-09 1.4E-08 NC 7.0E-01 NC 1.9E-08SG-1S SG-1 5 Cumene 0.0058 4.0E-06 2.3E-08 9.5E-09 2.2E-08 NC 4.0E-01 NC 5.6E-08SG-1S SG-1 5 Ethanol 0.0032 8.1E-06 2.6E-08 1.1E-08 2.5E-08 NC 1.1E+00 NC 2.4E-08SG-1S SG-1 5 Ethylbenzene 0.052 4.6E-06 2.4E-07 9.9E-08 2.3E-07 2.5E-03 1.0E+00 2.5E-10 2.3E-07SG-1S SG-1 5 Freon 11 0.0008 5.4E-06 4.3E-09 1.8E-09 4.1E-09 NC 7.0E-01 NC 5.9E-09SG-1S SG-1 5 Freon 12 0.0014 4.1E-06 5.7E-09 2.4E-09 5.5E-09 NC 2.0E-01 NC 2.8E-08SG-1S SG-1 5 Heptane 0.0006 4.3E-06 2.6E-09 1.1E-09 2.5E-09 NC 7.0E-01 NC 3.6E-09SG-1S SG-1 5 Methyl tert-butyl ether 0.001 6.3E-06 6.3E-09 2.6E-09 6.1E-09 2.6E-04 3.0E+00 6.7E-13 2.0E-09SG-1S SG-1 5 Naphthalene 0.00375 3.6E-06 1.4E-08 5.6E-09 1.3E-08 3.4E-02 3.0E-03 1.9E-10 4.4E-06SG-1S SG-1 5 Propylbenzene 0.021 3.7E-06 7.8E-08 3.2E-08 7.5E-08 NC 1.0E+00 NC 7.5E-08SG-1S SG-1 5 Styrene 0.0006 4.4E-06 2.6E-09 1.1E-09 2.5E-09 NC 9.0E-01 NC 2.8E-09SG-1S SG-1 5 Tetrachloroethene 0.0021 4.4E-06 9.3E-09 3.8E-09 8.9E-09 5.9E-03 3.5E-02 2.3E-11 2.6E-07SG-1S SG-1 5 Toluene 0.011 5.4E-06 5.9E-08 2.4E-08 5.7E-08 NC 3.0E-01 NC 1.9E-07SG-1S SG-1 5 Total Xylenes 0.311 5.2E-06 1.6E-06 6.7E-07 1.6E-06 NC 1.0E-01 NC 1.6E-05SG-1S SG-1 5 Trichloroethene 0.00075 4.9E-06 3.7E-09 1.5E-09 3.5E-09 2.0E-03 6.0E-01 3.0E-12 5.8E-09 5.7E-10 1.4E-04SG-1D SG-1 8 1,1-Difluoroethane 0.0029 3.9E-06 1.1E-08 4.7E-09 1.1E-08 NC 4.0E+01 NC 2.7E-10SG-1D SG-1 8 1,2,4-Trimethylbenzene 0.21 2.3E-06 4.9E-07 2.0E-07 4.7E-07 NC 7.0E-03 NC 6.7E-05SG-1D SG-1 8 1,3,5-Trimethylbenzene 0.091 2.3E-06 2.1E-07 8.7E-08 2.0E-07 NC 6.0E-03 NC 3.4E-05SG-1D SG-1 8 2-Butanone (Methyl Ethyl K 0.0039 3.1E-06 1.2E-08 5.0E-09 1.2E-08 NC 5.0E+00 NC 2.3E-09SG-1D SG-1 8 2-Hexanone 0.0044 2.7E-06 1.2E-08 4.9E-09 1.1E-08 NC 3.0E-02 NC 3.8E-07SG-1D SG-1 8 4-Ethyltoluene 0.22 2.6E-06 5.8E-07 2.4E-07 5.5E-07 NC 1.0E-01 NC 5.5E-06SG-1D SG-1 8 Acetone 0.078 4.8E-06 3.8E-07 1.5E-07 3.6E-07 NC 3.1E+01 NC 1.2E-08SG-1D SG-1 8 Benzene 0.0022 3.4E-06 7.5E-09 3.1E-09 7.1E-09 2.9E-02 3.0E-02 8.9E-11 2.4E-07SG-1D SG-1 8 Carbon Disulfide 0.00335 4.0E-06 1.3E-08 5.5E-09 1.3E-08 NC 7.0E-01 NC 1.8E-08SG-1D SG-1 8 Cumene 0.008 2.5E-06 2.0E-08 8.2E-09 1.9E-08 NC 4.0E-01 NC 4.8E-08SG-1D SG-1 8 Ethanol 0.002 5.0E-06 1.0E-08 4.1E-09 9.7E-09 NC 1.1E+00 NC 9.2E-09SG-1D SG-1 8 Ethylbenzene 0.071 2.9E-06 2.1E-07 8.4E-08 2.0E-07 2.5E-03 1.0E+00 2.1E-10 2.0E-07SG-1D SG-1 8 Freon 11 0.0012 3.4E-06 4.0E-09 1.7E-09 3.9E-09 NC 7.0E-01 NC 5.5E-09SG-1D SG-1 8 Freon 12 0.00105 2.6E-06 2.7E-09 1.1E-09 2.6E-09 NC 2.0E-01 NC 1.3E-08SG-1D SG-1 8 Heptane 0.0009 2.7E-06 2.4E-09 1.0E-09 2.3E-09 NC 7.0E-01 NC 3.3E-09SG-1D SG-1 8 Methyl tert-butyl ether 0.00075 3.9E-06 3.0E-09 1.2E-09 2.8E-09 2.6E-04 3.0E+00 3.2E-13 9.5E-10SG-1D SG-1 8 Naphthalene 0.0055 2.3E-06 1.3E-08 5.1E-09 1.2E-08 3.4E-02 3.0E-03 1.7E-10 4.0E-06SG-1D SG-1 8 Propylbenzene 0.028 2.3E-06 6.5E-08 2.7E-08 6.2E-08 NC 1.0E+00 NC 6.2E-08SG-1D SG-1 8 Styrene 0.005 2.7E-06 1.4E-08 5.6E-09 1.3E-08 NC 9.0E-01 NC 1.5E-08SG-1D SG-1 8 Tetrachloroethene 0.0039 2.8E-06 1.1E-08 4.4E-09 1.0E-08 5.9E-03 3.5E-02 2.6E-11 3.0E-07SG-1D SG-1 8 Toluene 0.013 3.4E-06 4.4E-08 1.8E-08 4.2E-08 NC 3.0E-01 NC 1.4E-07SG-1D SG-1 8 Total Xylenes 0.459 3.3E-06 1.5E-06 6.2E-07 1.4E-06 NC 1.0E-01 NC 1.4E-05SG-1D SG-1 8 Trichloroethene 0.00115 3.0E-06 3.5E-09 1.4E-09 3.4E-09 2.0E-03 6.0E-01 2.9E-12 5.6E-09 5.0E-10 1.3E-04

TABLE 21OUTDOOR AIR INHALATION CANCER RISKS AND NONCANCER HAZARD INDICES FOR VOCS IN SOIL GAS:

CURRENT OFF-SITE AND FUTURE ON-SITE RESIDENTIAL SCENARIOSFormer Lodi Manufactured Gas Plant

Lodi, California


Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c

Exposure Point





(mg/m3)e



Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapors


Noncancer Hazard



Cumulative Cancer

Risk


Hazard



Lodi, California

SG-2S SG-2 5 1,1-Difluoroethane 0.026 6.3E-06 1.6E-07 6.7E-08 1.6E-07 NC 4.0E+01 NC 3.9E-09SG-2S SG-2 5 1,2,4-Trimethylbenzene 0.12 3.7E-06 4.5E-07 1.8E-07 4.3E-07 NC 7.0E-03 NC 6.1E-05SG-2S SG-2 5 1,3,5-Trimethylbenzene 0.041 3.7E-06 1.5E-07 6.3E-08 1.5E-07 NC 6.0E-03 NC 2.5E-05SG-2S SG-2 5 2-Butanone (Methyl Ethyl K 0.0055 5.0E-06 2.8E-08 1.1E-08 2.6E-08 NC 5.0E+00 NC 5.3E-09SG-2S SG-2 5 2-Hexanone 0.039 4.4E-06 1.7E-07 7.0E-08 1.6E-07 NC 3.0E-02 NC 5.4E-06SG-2S SG-2 5 4-Ethyltoluene 0.07 4.2E-06 2.9E-07 1.2E-07 2.8E-07 NC 1.0E-01 NC 2.8E-06SG-2S SG-2 5 Acetone 0.15 7.7E-06 1.2E-06 4.7E-07 1.1E-06 NC 3.1E+01 NC 3.6E-08SG-2S SG-2 5 Benzene 0.006 5.4E-06 3.3E-08 1.3E-08 3.1E-08 2.9E-02 3.0E-02 3.9E-10 1.0E-06SG-2S SG-2 5 Carbon Disulfide 0.0295 6.4E-06 1.9E-07 7.8E-08 1.8E-07 NC 7.0E-01 NC 2.6E-07SG-2S SG-2 5 Cumene 0.019 4.0E-06 7.6E-08 3.1E-08 7.3E-08 NC 4.0E-01 NC 1.8E-07SG-2S SG-2 5 Ethanol 0.018 8.1E-06 1.5E-07 6.0E-08 1.4E-07 NC 1.1E+00 NC 1.3E-07SG-2S SG-2 5 Ethylbenzene 0.25 4.6E-06 1.2E-06 4.7E-07 1.1E-06 2.5E-03 1.0E+00 1.2E-09 1.1E-06SG-2S SG-2 5 Freon 11 0.0105 5.4E-06 5.6E-08 2.3E-08 5.4E-08 NC 7.0E-01 NC 7.7E-08SG-2S SG-2 5 Freon 12 0.0095 4.1E-06 3.9E-08 1.6E-08 3.7E-08 NC 2.0E-01 NC 1.9E-07SG-2S SG-2 5 Heptane 0.008 4.3E-06 3.5E-08 1.4E-08 3.3E-08 NC 7.0E-01 NC 4.8E-08SG-2S SG-2 5 Methyl tert-butyl ether 0.014 6.3E-06 8.8E-08 3.6E-08 8.5E-08 2.6E-04 3.0E+00 9.4E-12 2.8E-08SG-2S SG-2 5 Naphthalene 0.05 3.6E-06 1.8E-07 7.5E-08 1.7E-07 3.4E-02 3.0E-03 2.5E-09 5.8E-05SG-2S SG-2 5 Propylbenzene 0.0095 3.7E-06 3.5E-08 1.4E-08 3.4E-08 NC 1.0E+00 NC 3.4E-08SG-2S SG-2 5 Styrene 0.008 4.4E-06 3.5E-08 1.4E-08 3.4E-08 NC 9.0E-01 NC 3.7E-08SG-2S SG-2 5 Tetrachloroethene 0.013 4.4E-06 5.8E-08 2.4E-08 5.5E-08 5.9E-03 3.5E-02 1.4E-10 1.6E-06SG-2S SG-2 5 Toluene 3.4 5.4E-06 1.8E-05 7.5E-06 1.7E-05 NC 3.0E-01 NC 5.8E-05SG-2S SG-2 5 Total Xylenes 1.34 5.2E-06 7.0E-06 2.9E-06 6.7E-06 NC 1.0E-01 NC 6.7E-05SG-2S SG-2 5 Trichloroethene 0.01 4.9E-06 4.9E-08 2.0E-08 4.7E-08 2.0E-03 6.0E-01 4.0E-11 7.8E-08 4.3E-09 2.8E-04SG-2D SG-2 8 1,1-Difluoroethane 0.06 3.9E-06 2.4E-07 9.7E-08 2.3E-07 NC 4.0E+01 NC 5.7E-09SG-2D SG-2 8 1,2,4-Trimethylbenzene 0.16 2.3E-06 3.7E-07 1.5E-07 3.6E-07 NC 7.0E-03 NC 5.1E-05SG-2D SG-2 8 1,3,5-Trimethylbenzene 0.069 2.3E-06 1.6E-07 6.6E-08 1.5E-07 NC 6.0E-03 NC 2.6E-05SG-2D SG-2 8 2-Butanone (Methyl Ethyl K 0.016 3.1E-06 5.0E-08 2.1E-08 4.8E-08 NC 5.0E+00 NC 9.6E-09SG-2D SG-2 8 2-Hexanone 0.09 2.7E-06 2.4E-07 1.0E-07 2.3E-07 NC 3.0E-02 NC 7.8E-06SG-2D SG-2 8 4-Ethyltoluene 0.091 2.6E-06 2.4E-07 9.8E-08 2.3E-07 NC 1.0E-01 NC 2.3E-06SG-2D SG-2 8 Acetone 0.26 4.8E-06 1.3E-06 5.1E-07 1.2E-06 NC 3.1E+01 NC 3.9E-08SG-2D SG-2 8 Benzene 0.017 3.4E-06 5.8E-08 2.4E-08 5.5E-08 2.9E-02 3.0E-02 6.9E-10 1.8E-06SG-2D SG-2 8 Carbon Disulfide 0.0165 4.0E-06 6.6E-08 2.7E-08 6.3E-08 NC 7.0E-01 NC 9.1E-08SG-2D SG-2 8 Cumene 0.026 2.5E-06 6.5E-08 2.7E-08 6.2E-08 NC 4.0E-01 NC 1.6E-07SG-2D SG-2 8 Ethanol 0.0405 5.0E-06 2.0E-07 8.4E-08 2.0E-07 NC 1.1E+00 NC 1.9E-07SG-2D SG-2 8 Ethylbenzene 0.69 2.9E-06 2.0E-06 8.2E-07 1.9E-06 2.5E-03 1.0E+00 2.0E-09 1.9E-06SG-2D SG-2 8 Freon 11 0.03 3.4E-06 1.0E-07 4.1E-08 9.6E-08 NC 7.0E-01 NC 1.4E-07SG-2D SG-2 8 Freon 12 0.0265 2.6E-06 6.8E-08 2.8E-08 6.5E-08 NC 2.0E-01 NC 3.3E-07SG-2D SG-2 8 Heptane 0.022 2.7E-06 6.0E-08 2.5E-08 5.7E-08 NC 7.0E-01 NC 8.2E-08SG-2D SG-2 8 Methyl tert-butyl ether 0.019 3.9E-06 7.5E-08 3.1E-08 7.2E-08 2.6E-04 3.0E+00 8.0E-12 2.4E-08SG-2D SG-2 8 Naphthalene 0.11 2.3E-06 2.5E-07 1.0E-07 2.4E-07 3.4E-02 3.0E-03 3.5E-09 8.0E-05SG-2D SG-2 8 Propylbenzene 0.0265 2.3E-06 6.1E-08 2.5E-08 5.9E-08 NC 1.0E+00 NC 5.9E-08SG-2D SG-2 8 Styrene 0.023 2.7E-06 6.3E-08 2.6E-08 6.0E-08 NC 9.0E-01 NC 6.7E-08SG-2D SG-2 8 Tetrachloroethene 0.036 2.8E-06 1.0E-07 4.1E-08 9.6E-08 5.9E-03 3.5E-02 2.4E-10 2.7E-06SG-2D SG-2 8 Toluene 8 3.4E-06 2.7E-05 1.1E-05 2.6E-05 NC 3.0E-01 NC 8.6E-05SG-2D SG-2 8 Total Xylenes 3.49 3.3E-06 1.1E-05 4.7E-06 1.1E-05 NC 1.0E-01 NC 1.1E-04SG-2D SG-2 8 Trichloroethene 0.029 3.0E-06 8.8E-08 3.6E-08 8.5E-08 2.0E-03 6.0E-01 7.3E-11 1.4E-07 6.6E-09 3.7E-04


Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c

Exposure Point





(mg/m3)e



Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapors


Noncancer Hazard



Cumulative Cancer

Risk


Hazard



Lodi, California

SG-3S SG-3 5 1,1-Difluoroethane 0.0012 6.3E-06 7.6E-09 3.1E-09 7.3E-09 NC 4.0E+01 NC 1.8E-10SG-3S SG-3 5 1,2,4-Trimethylbenzene 0.18 3.7E-06 6.7E-07 2.8E-07 6.4E-07 NC 7.0E-03 NC 9.2E-05SG-3S SG-3 5 1,3,5-Trimethylbenzene 0.06 3.7E-06 2.2E-07 9.1E-08 2.1E-07 NC 6.0E-03 NC 3.6E-05SG-3S SG-3 5 2-Butanone (Methyl Ethyl K 0.0032 5.0E-06 1.6E-08 6.6E-09 1.5E-08 NC 5.0E+00 NC 3.1E-09SG-3S SG-3 5 2-Hexanone 0.0018 4.4E-06 7.8E-09 3.2E-09 7.5E-09 NC 3.0E-02 NC 2.5E-07SG-3S SG-3 5 4-Ethyltoluene 0.21 4.2E-06 8.8E-07 3.6E-07 8.4E-07 NC 1.0E-01 NC 8.4E-06SG-3S SG-3 5 Acetone 0.085 7.7E-06 6.5E-07 2.7E-07 6.3E-07 NC 3.1E+01 NC 2.0E-08SG-3S SG-3 5 Benzene 0.0014 5.4E-06 7.6E-09 3.1E-09 7.3E-09 2.9E-02 3.0E-02 9.0E-11 2.4E-07SG-3S SG-3 5 Carbon Disulfide 0.00135 6.4E-06 8.7E-09 3.6E-09 8.3E-09 NC 7.0E-01 NC 1.2E-08SG-3S SG-3 5 Cumene 0.011 4.0E-06 4.4E-08 1.8E-08 4.2E-08 NC 4.0E-01 NC 1.1E-07SG-3S SG-3 5 Ethanol 0.0008 8.1E-06 6.5E-09 2.7E-09 6.2E-09 NC 1.1E+00 NC 5.9E-09SG-3S SG-3 5 Ethylbenzene 0.03 4.6E-06 1.4E-07 5.7E-08 1.3E-07 2.5E-03 1.0E+00 1.4E-10 1.3E-07SG-3S SG-3 5 Freon 11 0.0013 5.4E-06 7.0E-09 2.9E-09 6.7E-09 NC 7.0E-01 NC 9.5E-09SG-3S SG-3 5 Freon 12 0.001 4.1E-06 4.1E-09 1.7E-09 3.9E-09 NC 2.0E-01 NC 2.0E-08SG-3S SG-3 5 Heptane 0.001 4.3E-06 4.3E-09 1.8E-09 4.2E-09 NC 7.0E-01 NC 5.9E-09SG-3S SG-3 5 Methyl tert-butyl ether 0.0034 6.3E-06 2.1E-08 8.8E-09 2.1E-08 2.6E-04 3.0E+00 2.3E-12 6.9E-09SG-3S SG-3 5 Naphthalene 0.023 3.6E-06 8.4E-08 3.4E-08 8.0E-08 3.4E-02 3.0E-03 1.2E-09 2.7E-05SG-3S SG-3 5 Propylbenzene 0.032 3.7E-06 1.2E-07 4.9E-08 1.1E-07 NC 1.0E+00 NC 1.1E-07SG-3S SG-3 5 Styrene 0.00037 4.4E-06 1.6E-09 6.7E-10 1.6E-09 NC 9.0E-01 NC 1.7E-09SG-3S SG-3 5 Tetrachloroethene 0.0035 4.4E-06 1.6E-08 6.4E-09 1.5E-08 5.9E-03 3.5E-02 3.8E-11 4.3E-07SG-3S SG-3 5 Toluene 0.12 5.4E-06 6.4E-07 2.6E-07 6.2E-07 NC 3.0E-01 NC 2.1E-06SG-3S SG-3 5 Total Xylenes 0.2 5.2E-06 1.0E-06 4.3E-07 1.0E-06 NC 1.0E-01 NC 1.0E-05SG-3S SG-3 5 Trichloroethene 0.0021 4.9E-06 1.0E-08 4.2E-09 9.8E-09 2.0E-03 6.0E-01 8.4E-12 1.6E-08 1.5E-09 1.8E-04SG-3D SG-3 8 1,1-Difluoroethane 0.0013 3.9E-06 5.1E-09 2.1E-09 4.9E-09 NC 4.0E+01 NC 1.2E-10SG-3D SG-3 8 1,2,4-Trimethylbenzene 0.24 2.3E-06 5.6E-07 2.3E-07 5.4E-07 NC 7.0E-03 NC 7.7E-05SG-3D SG-3 8 1,3,5-Trimethylbenzene 0.088 2.3E-06 2.0E-07 8.4E-08 2.0E-07 NC 6.0E-03 NC 3.3E-05SG-3D SG-3 8 2-Butanone (Methyl Ethyl K 0.0026 3.1E-06 8.1E-09 3.3E-09 7.8E-09 NC 5.0E+00 NC 1.6E-09SG-3D SG-3 8 2-Hexanone 0.0042 2.7E-06 1.1E-08 4.7E-09 1.1E-08 NC 3.0E-02 NC 3.7E-07SG-3D SG-3 8 4-Ethyltoluene 0.31 2.6E-06 8.1E-07 3.3E-07 7.8E-07 NC 1.0E-01 NC 7.8E-06SG-3D SG-3 8 Acetone 0.018 4.8E-06 8.7E-08 3.6E-08 8.3E-08 NC 3.1E+01 NC 2.7E-09SG-3D SG-3 8 Benzene 0.0013 3.4E-06 4.4E-09 1.8E-09 4.2E-09 2.9E-02 3.0E-02 5.3E-11 1.4E-07SG-3D SG-3 8 Carbon Disulfide 0.0015 4.0E-06 6.0E-09 2.5E-09 5.8E-09 NC 7.0E-01 NC 8.2E-09SG-3D SG-3 8 Cumene 0.01 2.5E-06 2.5E-08 1.0E-08 2.4E-08 NC 4.0E-01 NC 6.0E-08SG-3D SG-3 8 Ethanol 0.0009 5.0E-06 4.5E-09 1.9E-09 4.4E-09 NC 1.1E+00 NC 4.1E-09SG-3D SG-3 8 Ethylbenzene 0.023 2.9E-06 6.6E-08 2.7E-08 6.4E-08 2.5E-03 1.0E+00 6.8E-11 6.4E-08SG-3D SG-3 8 Freon 11 0.0014 3.4E-06 4.7E-09 1.9E-09 4.5E-09 NC 7.0E-01 NC 6.4E-09SG-3D SG-3 8 Freon 12 0.000485 2.6E-06 1.2E-09 5.1E-10 1.2E-09 NC 2.0E-01 NC 6.0E-09SG-3D SG-3 8 Heptane 0.0017 2.7E-06 4.6E-09 1.9E-09 4.4E-09 NC 7.0E-01 NC 6.3E-09SG-3D SG-3 8 Methyl tert-butyl ether 0.00071 3.9E-06 2.8E-09 1.2E-09 2.7E-09 2.6E-04 3.0E+00 3.0E-13 9.0E-10SG-3D SG-3 8 Naphthalene 0.015 2.3E-06 3.4E-08 1.4E-08 3.3E-08 3.4E-02 3.0E-03 4.8E-10 1.1E-05SG-3D SG-3 8 Propylbenzene 0.048 2.3E-06 1.1E-07 4.6E-08 1.1E-07 NC 1.0E+00 NC 1.1E-07SG-3D SG-3 8 Styrene 0.000415 2.7E-06 1.1E-09 4.7E-10 1.1E-09 NC 9.0E-01 NC 1.2E-09SG-3D SG-3 8 Tetrachloroethene 0.009 2.8E-06 2.5E-08 1.0E-08 2.4E-08 5.9E-03 3.5E-02 6.1E-11 6.8E-07SG-3D SG-3 8 Toluene 0.036 3.4E-06 1.2E-07 5.0E-08 1.2E-07 NC 3.0E-01 NC 3.9E-07SG-3D SG-3 8 Total Xylenes 0.134 3.3E-06 4.4E-07 1.8E-07 4.2E-07 NC 1.0E-01 NC 4.2E-06SG-3D SG-3 8 Trichloroethene 0.0005 3.0E-06 1.5E-09 6.3E-10 1.5E-09 2.0E-03 6.0E-01 1.3E-12 2.4E-09 6.6E-10 1.3E-04


Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c

Exposure Point





(mg/m3)e



Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapors


Noncancer Hazard



Cumulative Cancer

Risk


Hazard



Lodi, California



Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c

Exposure Point





(mg/m3)e



Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapors


Noncancer Hazard



Cumulative Cancer

Risk


Hazard



Lodi, California

Site-wide Average 1.9E-09 1.4E-04

Notes:

bgs = below ground surface

NC = Not considered to be a carcinogen.

mg/m3 = micrograms per cubic meter

f Incremental cancer risks and noncancer hazard quotients were calculated using equations presented in Table 5 and exposure parameters presented in Table 4.

a All locations and depths are included.b Measured chemical concentration in soil gas. Detected results are presented in bold. Non-detect results are represented by one-half the laboratory reporting limit; non-detect results are included if the chemical was detected in at least one site soil gas sample. In the case of non-detect results in both duplicate and primary samples, one-half of the lower of the two detection limits was evaluated.c The transfer factor represents the relationship between the chemical concentration in soil gas and the chemical concentration in outdoor air (resulting from volatilization from soil gas into outdoor air). The methodology used in the calculation of transfer factors is presented in Attachment D.d The exposure point concentration (EPC) in outdoor air is the actual concentration the receptor is exposed to while in outdoor air. e The exposure concentrations (ECs) are analagous to chronic daily intakes (CDIs).


Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c

Exposure Point





(mg/m3)e



Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapors


Noncancer Hazard



Cumulative

Cancer Risk




CURRENT OFF-SITE COMMERCIAL SCENARIOFormer Lodi Manufactured Gas Plant

Lodi, California


Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c

Exposure Point





(mg/m3)e



Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapors


Noncancer Hazard



Cumulative

Cancer Risk


Hazard



Lodi, California



Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Transfer Factor

[(mg/m3)/(mg/m3)]c

Exposure Point





(mg/m3)e



Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapors


Noncancer Hazard



Cumulative

Cancer Risk


Hazard



Lodi, California

Site-wide Average 3.7E-10 3.4E-05

Notes:





a All locations and depths are included.b Measured chemical concentration in soil gas. Detected results are presented in bold. Non-detect results are represented by one-half the laboratory reporting limit; non-detect results are included if the chemical was detected in at least one site soil gas sample. In the case of non-detect results in both duplicate and primary samples, one-half of the lower of the two detection limits was evaluated.c The transfer factor represents the relationship between the chemical concentration in soil gas and the chemical concentration in outdoor air (resulting from volatilization from soil gas into outdoor air). The methodology used in the calculation of transfer factors is presented in Attachment D.d The exposure point concentration (EPC) in outdoor air is the actual concentration the receptor is exposed to while in outdoor air. e The exposure concentrations (ECs) are analagous to chronic daily intakes (CDIs).


Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c

Exposure Point

Concentration (EPC) in Indoor

Air (mg/m3)d


in Indoor Air – Cancer Effects

(mg/m3)e


in Indoor Air– Noncancer

Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapor

Intrusion (unitless)f

Noncancer Hazard

Quotient from Vapor


Cumulative Cancer

Risk



TABLE 23VAPOR INTRUSION CANCER RISKS AND NONCANCER HAZARD INDICES FOR VOCS IN SOIL GAS: FUTURE ON-SITE RESIDENTIAL SCENARIO



Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c

Exposure Point


Air (mg/m3)d



(mg/m3)e



Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapor


Noncancer Hazard

Quotient from Vapor


Cumulative Cancer

Risk


Hazard





Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c

Exposure Point


Air (mg/m3)d



(mg/m3)e



Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapor


Noncancer Hazard

Quotient from Vapor


Cumulative Cancer

Risk


Hazard



SG-6S SG-6 5 1,1-Difluoroethane 0.006 1.0E-03 6.1E-06 2.5E-06 5.8E-06 NC 4.0E+01 NC 1.5E-07SG-6S SG-6 5 1,2,4-Trimethylbenzene 0.011 7.2E-04 7.9E-06 3.3E-06 7.6E-06 NC 7.0E-03 NC 1.1E-03SG-6S SG-6 5 1,3,5-Trimethylbenzene 0.0021 7.2E-04 1.5E-06 6.2E-07 1.4E-06 NC 6.0E-03 NC 2.4E-04SG-6S SG-6 5 2-Butanone (Methyl Ethyl K 0.004 8.8E-04 3.5E-06 1.4E-06 3.4E-06 NC 5.0E+00 NC 6.7E-07SG-6S SG-6 5 2-Hexanone 0.009 8.0E-04 7.2E-06 3.0E-06 6.9E-06 NC 3.0E-02 NC 2.3E-04SG-6S SG-6 5 4-Ethyltoluene 0.008 7.8E-04 6.2E-06 2.6E-06 6.0E-06 NC 1.0E-01 NC 6.0E-05SG-6S SG-6 5 Acetone 0.03 1.1E-03 3.4E-05 1.4E-05 3.3E-05 NC 3.1E+01 NC 1.1E-06SG-6S SG-6 5 Benzene 0.00135 9.2E-04 1.2E-06 5.1E-07 1.2E-06 2.9E-02 3.0E-02 1.5E-08 4.0E-05SG-6S SG-6 5 Carbon Disulfide 0.0065 1.0E-03 6.6E-06 2.7E-06 6.4E-06 NC 7.0E-01 NC 9.1E-06SG-6S SG-6 5 Cumene 0.0021 7.6E-04 1.6E-06 6.5E-07 1.5E-06 NC 4.0E-01 NC 3.8E-06SG-6S SG-6 5 Ethanol 0.004 1.2E-03 4.6E-06 1.9E-06 4.5E-06 NC 1.1E+00 NC 4.2E-06SG-6S SG-6 5 Ethylbenzene 0.037 8.3E-04 3.1E-05 1.3E-05 3.0E-05 2.5E-03 1.0E+00 3.2E-08 3.0E-05SG-6S SG-6 5 Freon 11 0.0024 9.2E-04 2.2E-06 9.0E-07 2.1E-06 NC 7.0E-01 NC 3.0E-06SG-6S SG-6 5 Freon 12 0.0021 7.7E-04 1.6E-06 6.6E-07 1.5E-06 NC 2.0E-01 NC 7.7E-06SG-6S SG-6 5 Heptane 0.0076 8.0E-04 6.1E-06 2.5E-06 5.8E-06 NC 7.0E-01 NC 8.3E-06SG-6S SG-6 5 Methyl tert-butyl ether 0.00155 1.0E-03 1.6E-06 6.4E-07 1.5E-06 2.6E-04 3.0E+00 1.7E-10 5.0E-07SG-6S SG-6 5 Naphthalene 0.011 7.1E-04 7.8E-06 3.2E-06 7.5E-06 3.4E-02 3.0E-03 1.1E-07 2.5E-03SG-6S SG-6 5 Propylbenzene 0.0021 7.2E-04 1.5E-06 6.2E-07 1.4E-06 NC 1.0E+00 NC 1.4E-06SG-6S SG-6 5 Styrene 0.0018 8.0E-04 1.4E-06 5.9E-07 1.4E-06 NC 9.0E-01 NC 1.5E-06SG-6S SG-6 5 Tetrachloroethene 0.0029 8.1E-04 2.3E-06 9.7E-07 2.3E-06 5.9E-03 3.5E-02 5.7E-09 6.4E-05SG-6S SG-6 5 Toluene 0.57 9.2E-04 5.2E-04 2.1E-04 5.0E-04 NC 3.0E-01 NC 1.7E-03SG-6S SG-6 5 Total Xylenes 0.182 9.0E-04 1.6E-04 6.8E-05 1.6E-04 NC 1.0E-01 NC 1.6E-03SG-6S SG-6 5 Trichloroethene 0.0023 8.6E-04 2.0E-06 8.1E-07 1.9E-06 2.0E-03 6.0E-01 1.6E-09 3.2E-06 1.6E-07 7.5E-03


Sample ID

Soil Gas Sample

Locationa

Sampling Depth

(feet bgs) Chemical


(mg/m3)b

Attenuation Factor

[(mg/m3)/(mg/m3)]c

Exposure Point


Air (mg/m3)d



(mg/m3)e



Effects (mg/m3)e

URF (mg/m3)-1

RfC (mg/m3)

Incremental Cancer

Risk from Vapor


Noncancer Hazard

Quotient from Vapor


Cumulative Cancer

Risk


Hazard



SG-6D SG-6 8 1,1-Difluoroethane 0.0115 7.3E-04 8.3E-06 3.4E-06 8.0E-06 NC 4.0E+01 NC 2.0E-07SG-6D SG-6 8 1,2,4-Trimethylbenzene 0.016 4.9E-04 7.8E-06 3.2E-06 7.5E-06 NC 7.0E-03 NC 1.1E-03SG-6D SG-6 8 1,3,5-Trimethylbenzene 0.0041 4.9E-04 2.0E-06 8.2E-07 1.9E-06 NC 6.0E-03 NC 3.2E-04SG-6D SG-6 8 2-Butanone (Methyl Ethyl K 0.0069 6.1E-04 4.2E-06 1.7E-06 4.1E-06 NC 5.0E+00 NC 8.1E-07SG-6D SG-6 8 2-Hexanone 0.017 5.5E-04 9.4E-06 3.9E-06 9.0E-06 NC 3.0E-02 NC 3.0E-04SG-6D SG-6 8 4-Ethyltoluene 0.012 5.4E-04 6.4E-06 2.6E-06 6.2E-06 NC 1.0E-01 NC 6.2E-05SG-6D SG-6 8 Acetone 0.06 8.3E-04 5.0E-05 2.1E-05 4.8E-05 NC 3.1E+01 NC 1.5E-06SG-6D SG-6 8 Benzene 0.0027 6.5E-04 1.8E-06 7.2E-07 1.7E-06 2.9E-02 3.0E-02 2.1E-08 5.6E-05SG-6D SG-6 8 Carbon Disulfide 0.013 7.3E-04 9.5E-06 3.9E-06 9.2E-06 NC 7.0E-01 NC 1.3E-05SG-6D SG-6 8 Cumene 0.0041 5.2E-04 2.1E-06 8.7E-07 2.0E-06 NC 4.0E-01 NC 5.1E-06SG-6D SG-6 8 Ethanol 0.008 8.6E-04 6.9E-06 2.8E-06 6.6E-06 NC 1.1E+00 NC 6.3E-06SG-6D SG-6 8 Ethylbenzene 0.069 5.8E-04 4.0E-05 1.6E-05 3.8E-05 2.5E-03 1.0E+00 4.1E-08 3.8E-05SG-6D SG-6 8 Freon 11 0.0047 6.5E-04 3.0E-06 1.2E-06 2.9E-06 NC 7.0E-01 NC 4.2E-06SG-6D SG-6 8 Freon 12 0.00415 5.3E-04 2.2E-06 9.0E-07 2.1E-06 NC 2.0E-01 NC 1.0E-05SG-6D SG-6 8 Heptane 0.013 5.5E-04 7.2E-06 2.9E-06 6.9E-06 NC 7.0E-01 NC 9.8E-06SG-6D SG-6 8 Methyl tert-butyl ether 0.003 7.3E-04 2.2E-06 9.0E-07 2.1E-06 2.6E-04 3.0E+00 2.3E-10 7.0E-07SG-6D SG-6 8 Naphthalene 0.022 4.8E-04 1.1E-05 4.3E-06 1.0E-05 3.4E-02 3.0E-03 1.5E-07 3.4E-03SG-6D SG-6 8 Propylbenzene 0.0041 4.9E-04 2.0E-06 8.2E-07 1.9E-06 NC 1.0E+00 NC 1.9E-06SG-6D SG-6 8 Styrene 0.0036 5.5E-04 2.0E-06 8.2E-07 1.9E-06 NC 9.0E-01 NC 2.1E-06SG-6D SG-6 8 Tetrachloroethene 0.0055 5.6E-04 3.1E-06 1.3E-06 3.0E-06 5.9E-03 3.5E-02 7.5E-09 8.4E-05SG-6D SG-6 8 Toluene 1 6.5E-04 6.5E-04 2.7E-04 6.2E-04 NC 3.0E-01 NC 2.1E-03SG-6D SG-6 8 Total Xylenes 0.34 6.3E-04 2.2E-04 8.9E-05 2.1E-04 NC 1.0E-01 NC 2.1E-03SG-6D SG-6 8 Trichloroethene 0.0045 6.0E-04 2.7E-06 1.1E-06 2.6E-06 2.0E-03 6.0E-01 2.2E-09 4.3E-06 2.1E-08 1.8E-03

Notes:





a All locations and depths are included.b Measured chemical concentration in soil gas. Detected results are presented in bold. Non-detect results are represented by one-half the laboratory reporting limit; non-detect results are included if the chemical was detected in at least one site soil gas sample. In the case of non-detect results in both duplicate and primary samples, one-half of the lower of the two detection limits was evaluated.

d The exposure point concentration (EPC) in indoor air is the actual concentration the receptor is exposed to while in indoor air. e The exposure concentrations (ECs) are analagous to chronic daily intakes (CDIs).

c The attenuation factor represents the relationship between the chemical concentration in soil gas and the chemical concentration in indoor air (resulting from volatilization from soil gas, i.e. , vapor intrusion). The methodology used in the calculation of attenuation factors is presented in Attachment D.


Cancer Risk-Based or

Ambient-Based Screening

Concentrations (mg/kg) a

Noncancer Risk-Based or


Concentrations (mg/kg) b

ChemicalOn-site

ResidentOn-site

Resident Child

Volatile Organic CompoundsBenzene 0.51 114Ethylbenzene 5.79 Sat(3,279)Toluene NC Sat(1,486)m,p-Xylene NC Sat(679)o-Xylene NC Sat(744)Polycyclic Aromatic Hydrocarbons1-Methylnaphthalene 17 2002-Methylnaphthalene NC 203Acenaphthene NC Sat(3,102)Acenaphthylene NC 3,270Anthracene NC 16,351Benzo (a) anthracene NA 1,635Benzo (a) pyrene NA 1,635Benzo (b) fluoranthene NA 1,635Benzo (g,h,i) perylene NC 1,635Benzo (k) fluoranthene NA 1,635Chrysene NA 1,635Dibenz (a,h) Anthracene NA 1,635Fluoranthene NC 2,180Fluorene NC 2,180Indeno (1,2,3-c,d) pyrene NA 1,635Naphthalene 2.1 182Phenanthrene NC 16,351Pyrene NC 1,635Carcinogenic Polycyclic Aromatic HydrocarbonsBenzo(a)pyrene Equivalent ABSC (0.9) NAInorganicsAmmonia (as N) NC 12,125Antimony NC 30Barium NC 14,841Beryllium 1,216 15Cadmium 695 39Chromium NC 114,013Cobalt 324 23Copper NC 3,040Cyanide, Total NC 36Lead NC 80Mercury NC 12Molybdenum NC 380Nickel 11,222 1,484Silver NC 380Thallium NC 5.0Vanadium NC 380

Lodi, California

TABLE 24SOIL RISK-BASED OR AMBIENT-BASED SCREENING CONCENTRATIONS:


c

d


Cancer Risk-Based or


Concentrations (mg/kg) a

Noncancer Risk-Based or


Concentrations (mg/kg) b

ChemicalOn-site

ResidentOn-site

Resident Child

Lodi, California

TABLE 24SOIL RISK-BASED OR AMBIENT-BASED SCREENING CONCENTRATIONS:


Zinc NC 22,803

Notes:NC = NA =

mg/kg = ABSC() =

Sat() =

a

b

c

d Cal/EPA's OEHHA CHHSL for residential exposure.

Noncarcinogenic compoundsNot applicable, evaluated under carcinogenic PAH as benzo(a)pyrene equivalent.

milligrams per kilogramThe value indicated in parentheses corresponds to the ambient-based screening concentration. For benzo(a)pryene equivalent, the risk-based screening concentration (RBSC) for the on-site resident is 0.036 mg/kg, which is below the ABSC ( i.e., 95th percentile of the Northern California background dataset, see Table 25).

The RBSCs indicated in parentheses represent an RBSC that is greater than the theoretical soil saturation limit for that compound. Soil saturation limits for each chemical are presented in Table 9.

RBSCs for carcinogenic effects presented in this table correspond to an incremental cancer risk of 1 x 10-6. RBSCs corresponding to incremental cancer risks of 10-5 and 10-4 would be 10 times and 100 times higher, respectively, than the RBSCs presented in this table.

Please note that the RBSCs for all volatile compounds are incredibly sensitive to the screening level assumptions made regarding the amount of mass available for transport. They are intentionally low (conservative), to allow for a quick screening and identification of potential problem areas. Following remediation, the actual post-remedial conditions will be accounted for in the final post-remediation health risk assessment.

RBSCs for noncarcinogenic effects presented in this table correspond to a hazard index of 1.0.


Summary Statistics Northern California CPAH

Ambient DataNumber of Samples 86Minimum 0.0027Maximum 2.8Average a 0.21Standard Deviation 0.4295% UCL 0.40UTLc (95% coverage, 95% confidence) 1.595th Percentile 0.92

Notes:

a

b

c

Corresponds to the arithmetic average concentration.Corresponds to the 95% Upper confidence limit (UCL) of the mean calculated based on the assumption of lognormality.Corresponds to the Upper Tolerance Limit (with 95% coverage and 95% confidence) calculated based on the assumption of lognormality.

TABLE 25SUMMARY STATISTICS FOR AMBIENT CPAH DATA


CPAH = Carcinogenic polycyclic aromatic hydrocarbons, expressed in terms of benzo(a)pyrene equivalents.


Area Sample NameSample Depth

(feet bgs)Chemical Concentration

(mg/kg)

Risk-Based or Ambient-Based

Screening Concentration

On-site SB-5-0' 0.0 Lead 1100 80On-site SB-5-0' 0.0 Benzo(a)pyrene Equivalent 29 0.9On-site SB-6-12.5' 12.5 Lead 93 80On-site SB-6-12.5' 12.5 Naphthalene 1500 2.1On-site SB-6-12.5' 12.5 Benzo(a)pyrene Equivalent 118 0.9On-site SB-6-12.5' 12.5 Benzene 3700 0.51On-site SB-6-12.5' 12.5 Ethylbenzene 40 5.8On-site SB-6-7.5' 7.5 Naphthalene 12 2.1On-site SB-6-7.5' 7.5 Benzo(a)pyrene Equivalent 7.2 0.9On-site SB-6-9.5' 9.5 Naphthalene 790 2.1On-site SB-6-9.5' 9.5 Benzo(a)pyrene Equivalent 54 0.9On-site SB-6-9.5' 9.5 Benzene 2700 0.51On-site SB-6-9.5' 9.5 Ethylbenzene 50 5.8On-site SB-7-0' 0.0 Lead 988 80On-site SB-7-0' 0.0 Naphthalene 180 2.1On-site SB-7-0' 0.0 Benzo(a)pyrene Equivalent 96 0.9On-site SB-7-6' 6.0 Lead 227 80On-site SB-7-6' 6.0 Naphthalene 27 2.1On-site SB-7-6' 6.0 Benzo(a)pyrene Equivalent 33 0.9On-site SB-7-6' (DUP- 6.0 Benzo(a)pyrene Equivalent 1.5 0.9On-site SB-8-5.5' 5.5 Lead 97 80On-site SB-8-5.5' 5.5 Naphthalene 67 2.1On-site SB-8-5.5' 5.5 Benzo(a)pyrene Equivalent 53 0.9On-site SB-9-0' 0.0 Lead 153 80On-site SB-9-0' 0.0 Benzo(a)pyrene Equivalent 4.8 0.9On-site SB-9-6' 6.0 Benzo(a)pyrene Equivalent 1.2 0.9On-site SB-10-1.5' 1.5 Cobalt 139 23On-site SB-10-1.5' 1.5 Naphthalene 2.7 2.1On-site SB-10-1.5' 1.5 Benzo(a)pyrene Equivalent 3.3 0.9On-site SB-13-0' 0.0 Lead 386 80On-site SB-13-0' 0.0 Naphthalene 19 2.1On-site SB-13-0' 0.0 Benzo(a)pyrene Equivalent 94 0.9On-site SB-13-3' 3.0 Lead 116 80On-site SB-13-3' 3.0 Naphthalene 3.4 2.1On-site SB-13-3' 3.0 Benzo(a)pyrene Equivalent 28 0.9On-site SB-14-0' 0.0 Lead 145 80On-site SB-14-0' 0.0 Benzo(a)pyrene Equivalent 2.2 0.9On-site SB-14-2' 2.0 Lead 143 80On-site SB-14-2' 2.0 Naphthalene 510 2.1On-site SB-14-2' 2.0 Benzo(a)pyrene Equivalent 85 0.9On-site SB-14-3' 3.0 Naphthalene 460 2.1On-site SB-14-3' 3.0 Benzo(a)pyrene Equivalent 71 0.9On-site SB-14-6' 6.0 Naphthalene 170 2.1On-site SB-14-6' 6.0 Benzo(a)pyrene Equivalent 20 0.9On-site SB-15-0' 0.0 Lead 261 80On-site SB-15-0' 0.0 Naphthalene 4.1 2.1On-site SB-15-0' 0.0 Benzo(a)pyrene Equivalent 15 0.9

TABLE 26SUMMARY OF SAMPLES WITH CHEMICALS ABOVE

RISK-BASED OR AMBIENT-BASED SCREENING CONCENTRATIONSFormer Lodi Manufactured Gas Plant

Lodi, California




(mg/kg)





Lodi, California

On-site SB-15-3' 3.0 Naphthalene 3.0 2.1On-site SB-15-3' 3.0 Benzo(a)pyrene Equivalent 10 0.9On-site SB-15-6' 6.0 Benzo(a)pyrene Equivalent 2.5 0.9On-site SB-16-1' 1.0 Lead 371 80On-site SB-16-1' 1.0 Benzo(a)pyrene Equivalent 16 0.9On-site SB-17-1' 1.0 Lead 863 80On-site SB-17-1' 1.0 Benzo(a)pyrene Equivalent 4.2 0.9On-site SB-17-20.5' 20.5 Naphthalene 4.8 2.1On-site SB-18-0' 0.0 Lead 268 80On-site SB-18-0' 0.0 Naphthalene 11 2.1On-site SB-18-0' 0.0 Benzo(a)pyrene Equivalent 57 0.9On-site SB-18-16' 16.0 Benzo(a)pyrene Equivalent 0.99 0.9On-site SB-19-21' 21.0 Naphthalene 4.8 2.1On-site SB-19-21' 21.0 Ethylbenzene 7.5 5.8On-site SB-20-0' 0.0 Lead 91 80On-site SB-20-0' 0.0 Benzo(a)pyrene Equivalent 5.3 0.9On-site SB-21-5' 5.0 Benzo(a)pyrene Equivalent 1.4 0.9On-site SB-22-0' 0.0 Lead 323 80On-site SB-22-0' 0.0 Naphthalene 16 2.1On-site SB-22-0' 0.0 Benzo(a)pyrene Equivalent 19 0.9On-site SB-22-5' 5.0 Benzo(a)pyrene Equivalent 2.6 0.9On-site SB-23-0' 0.0 Lead 1340 80On-site SB-23-0' 0.0 Naphthalene 3.4 2.1On-site SB-23-0' 0.0 Benzo(a)pyrene Equivalent 26 0.9On-site SB-23-12' 12.0 Lead 1100 80On-site SB-23-12' 12.0 Naphthalene 3.3 2.1On-site SB-23-12' 12.0 Benzo(a)pyrene Equivalent 24 0.9On-site SB-25-0' 0.0 Lead 180 80On-site SB-25-0' 0.0 Naphthalene 24 2.1On-site SB-25-0' 0.0 Benzo(a)pyrene Equivalent 62 0.9On-site SB-34-0' 0.0 Lead 207 80On-site SB-34-0' 0.0 Naphthalene 3.6 2.1On-site SB-34-0' 0.0 Benzo(a)pyrene Equivalent 19 0.9On-site SB-48-1.5' 1.5 Naphthalene 9.6 2.1On-site SB-48-1.5' 1.5 Benzo(a)pyrene Equivalent 91 0.9On-site SB-48-3' 3.0 Benzo(a)pyrene Equivalent 7.6 0.9On-site SB-49-3' 3.0 Naphthalene 4.9 2.1On-site SB-49-3' 3.0 Benzo(a)pyrene Equivalent 18 0.9On-site SB-49-4' 4.0 Lead 86 80On-site SB-49-4' 4.0 2-Methylnaphthalene 1000 203On-site SB-49-4' 4.0 Acenaphthylene 4100 3270On-site SB-49-4' 4.0 Benzo(g,h,i)Perylene 3400 1635On-site SB-49-4' 4.0 Fluoranthene 9800 2180On-site SB-49-4' 4.0 Naphthalene 23000 2.1On-site SB-49-4' 4.0 Pyrene 10000 1635On-site SB-49-4' 4.0 Benzo(a)pyrene Equivalent 4998 0.9On-site SB-49-4' 4.0 Benzene 0.81 0.51




(mg/kg)





Lodi, California

On-site SB-50-1.5' 1.5 Benzo(a)pyrene Equivalent 44 0.9On-site SB-51-1.5' 1.5 Benzo(a)pyrene Equivalent 2.4 0.9On-site SB-51-6.5' 6.5 Benzo(g,h,i)Perylene 11000 1635On-site SB-51-6.5' 6.5 Fluoranthene 20000 2180On-site SB-51-6.5' 6.5 Pyrene 21000 1635On-site SB-51-6.5' 6.5 Benzo(a)pyrene Equivalent 9824 0.9On-site SB-56-0.5' 0.5 Lead 346 80On-site SB-56-0.5' 0.5 Benzo(a)pyrene Equivalent 36 0.9On-site SS-2 0.0 Lead 24800 80On-site SS-2 0.0 Benzo(a)pyrene Equivalent 7.5 0.9On-site SS-3 0.0 Lead 451 80On-site SS-3 0.0 Thallium 7.8 5.0On-site SS-3 0.0 Naphthalene 5.0 2.1On-site SS-3 0.0 Benzo(a)pyrene Equivalent 170 0.9On-site SS-4 0.0 Lead 691 80On-site SS-4 0.0 Naphthalene 5.1 2.1On-site SS-4 0.0 Benzo(a)pyrene Equivalent 23 0.9On-site SS-5 0.0 Lead 147 80On-site SS-5 0.0 Benzo(a)pyrene Equivalent 1.1 0.9On-site SS-7 0.0 Antimony 50 30On-site SS-7 0.0 Lead 1400 80On-site SS-7 0.0 Naphthalene 15 2.1On-site SS-7 0.0 Benzo(a)pyrene Equivalent 87 0.9On-site SS-8 0.0 Lead 2320 80On-site SS-8 0.0 Naphthalene 3.3 2.1On-site SS-8 0.0 Benzo(a)pyrene Equivalent 43 0.9On-site SS-9 0.0 Lead 165 80On-site SS-9 0.0 Benzo(a)pyrene Equivalent 9.8 0.9On-site SS-10 0.0 Lead 599 80On-site TP-1-0.5' 0.5 Lead 108 80On-site TP-2-0.5' 0.5 Lead 200 80On-site TP-2-0.5' 0.5 Benzo(a)pyrene Equivalent 1.3 0.9On-site TP-2-6' 6.0 Benzo(a)pyrene Equivalent 6.8 0.9On-site TP-3-0.5' 0.5 Lead 347 80On-site TP-3-0.5' 0.5 Benzo(a)pyrene Equivalent 28 0.9On-site TP-5-0.5' 0.5 Lead 93 80On-site TP-6-0.5' 0.5 Lead 701 80On-site TP-6-0.5' 0.5 Benzo(a)pyrene Equivalent 2.8 0.9On-site TP-7-25D 2.7 Benzo(a)pyrene Equivalent 1.6 0.9On-site TP-7-25S 1.2 Lead 259 80On-site TP-7-25S 1.2 Benzo(a)pyrene Equivalent 2.8 0.9On-site TP-8-0.5' 0.5 Lead 250 80On-site TP-8-0.5' 0.5 Naphthalene 3.8 2.1On-site TP-8-0.5' 0.5 Benzo(a)pyrene Equivalent 46 0.9On-site TP-9-0.5' 0.5 Lead 168 80On-site TP-9-0.5' 0.5 Benzo(a)pyrene Equivalent 54 0.9On-site TP-9-3' 3.0 Benzo(a)pyrene Equivalent 3.2 0.9




(mg/kg)





Lodi, California

On-site TP-10-3' 3.0 Benzo(a)pyrene Equivalent 1.7 0.9On-site TP-11-0.5' 0.5 Naphthalene 5.8 2.1On-site TP-11-0.5' 0.5 Benzo(a)pyrene Equivalent 89 0.9On-site TP-11-3' 3.0 Benzo(a)pyrene Equivalent 31 0.9On-site TP-11-6' 6.0 Benzo(a)pyrene Equivalent 1.9 0.9On-site TP-11-9' 9.0 Benzo(a)pyrene Equivalent 4.9 0.9Off-site ROW SB-4-0' 0.0 Benzo(a)pyrene Equivalent 0.96 0.9Off-site ROW SB-4-7' 7.0 Lead 783 80Off-site ROW SB-4-7' 7.0 Benzo(a)pyrene Equivalent 3.8 0.9Off-site ROW SB-11-0' 0.0 Lead 101 80Off-site ROW SB-11-0' 0.0 Benzo(a)pyrene Equivalent 1.5 0.9Off-site ROW SB-12-0' 0.0 Lead 99 80Off-site ROW SB-12-0' 0.0 Benzo(a)pyrene Equivalent 1.3 0.9Off-site ROW SB-12-3' 3.0 Lead 383 80Off-site ROW SB-12-3' 3.0 Naphthalene 6.8 2.1Off-site ROW SB-12-3' 3.0 Benzo(a)pyrene Equivalent 36 0.9Off-site ROW SB-12-6' 6.0 Naphthalene 2.6 2.1Off-site ROW SB-12-6' 6.0 Benzo(a)pyrene Equivalent 8.4 0.9Off-site ROW SB-27-0.5' 0.5 Benzo(a)pyrene Equivalent 1.9 0.9Off-site ROW SB-33-0.5' 0.5 Lead 81 80Off-site ROW SB-33-0.5' 0.5 Naphthalene 49 2.1Off-site ROW SB-33-0.5' 0.5 Benzo(a)pyrene Equivalent 153 0.9Off-site ROW SB-47-0.5' 0.5 Lead 222 80Off-site ROW SB-47-0.5' 0.5 Benzo(a)pyrene Equivalent 25 0.9LIW SB-35-0' 0.0 Lead 129 80LIW SB-35-0' 0.0 Benzo(a)pyrene Equivalent 10 0.9LIW SB-37-0' 0.0 Naphthalene 5.8 2.1LIW SB-37-3' 3.0 Benzo(a)pyrene Equivalent 3.3 0.9LIW SB-38-0' 0.0 Naphthalene 5.0 2.1LIW SB-38-0' 0.0 Benzo(a)pyrene Equivalent 1.8 0.9LIW SB-39-0' 0.0 Naphthalene 2.2 2.1LIW SB-40-3' 3.0 Lead 250 80LIW SB-43-0' 0.0 Lead 100 80LIW SB-43-0' 0.0 Benzo(a)pyrene Equivalent 5.3 0.9LIW SB-44-0' 0.0 Nickel 4330 1471LIW SB-45-0' 0.0 Naphthalene 6.9 2.1

Notes:mg/kg = milligrams per kilogramLIW = Lodi Iron Works PropertyROW = right-of-way

Samples and chemicals SHADED IN GREY are not collocated with carcinogenic polycyclic aromatic hydrocarbons (CPAH; expressed as benzo(a)pyrene equivalents) concentrations exceeding the ambient-based screening concentration (ABSC) of 0.9 mg/kg.

Samples and chemicals in BOLDED FONT are representative of soils greater than 10 feet below ground surface (bgs).



IRIS ENVIRONMENTAL

FIGURES

PRIMARY SOURCE PRIMARY RELEASE MECHANISM

POTENTIAL SECONDARY

SOURCES

SECONDARY RELEASE

MECHANISMS

EXPOSURE MEDIA

EXPOSURE ROUTE

Current Off-site

Commercial Workers

Current Off-site

Residents

Future On-site

Residents

Ingestion •Dermal Contact •

Ingestion •Dermal Contact •

Inhalation • • •Legend:

• for further quantitative evaluation in HRA

Inhalation •

IngestionDermal Contact

File Name: I:PG&E\Lodi\HRA\Figures\Figure 3_CSM_Lodi_rev.xls

Former Lodi Manufactured Gas Plant Site Lodi, California

Drafter: SS Date: 6/23/11 Contract Number: 10-718-A

Surface Soil

Spills/LeaksOnsite Handling/

Movement

Surface Soil

Subsurface SoilSubsurface Soil

Ambient Air

Volatilization and Atmospheric Dispersion

Wind Erosion and Atmospheric Dispersion

= Potentially complete exposure pathway

Volatilization and Enclosed Space Accumulation

Figure

Indoor Air

Former MGP Operations • Crude Oil Storage • Lampblack Pits • Gas Holders

3

Ground Water

IRIS ENVIRONMENTAL1438 Webster St., Suite 302, Oakland, California 94612

Conceptual Site Model

Storm Water/ Surface Water

Runoff b

Leaching and Groundwater Transport a

a On-site soil and groundwater data indicate that constituents detected in groundwater to appear to be unrelated to historical site operations. Although migration of constituents from the subsurface soils down into the groundwater is currently considered incomplete based on existing Site data, the potential future migration of constituents from the subsurface soils down into the groundwater will be addressed in the FS/RAW.

b The Site is essentially flat and mostly unpaved. Swales are in place over sections of the Site, but are in poor shape. Most precipitation will likely percolate into the soils, minimizing the potential for surface runoff. Thus, the surface water runoff pathway is considered incomplete under current conditions and is not evaluated in the HRA.

X


IRIS ENVIRONMENTAL

ATTACHMENT A

SITE INVESTIGATION DATA INCLUDED IN HRA


A-1 IRIS ENVIRONMENTAL

ATTACHMENT A SITE INVESTIGATION DATA INCLUDED IN THE HRA

As discussed in Section 3.1 of the human health risk assessment (HRA) for the Former Lodi Manufactured Gas Plant Site (the “Site”), all data collected on-site and off-site during previous Site investigations were evaluated for use in the HRA. All soil and soil gas data collected during the 2006 Surface Soil Sampling, the 2008 and 2009 Remedial Investigation, and the 2010 Remedial Refinement Investigation were evaluated for inclusion in the HRA. For purposes of remedial decision-making, the boundary of ‘Site’ will include:

• street to the west of the Site (South Sacramento Street), and • 30-foot strip on LIW property directly south of Site.

As such, all data collected off-site in South Sacramento Street and on LIW property are included in the dataset used in the quantitative HRA. Soil and soil gas samples included in the HRA are summarized in Tables A-1 through A-5. Included in Table A-2 of this attachment is the summary of analytical data for individual PAHs as well as expressed in benzo(a)pyrene equivalent for the carcinogenic PAH results.


IRIS ENVIRONMENTAL

ATTACHMENT A TABLES

TABLE A-1ANALYTICAL DATA INCLUDED IN THE HRA - SOILS (0-10 FEET BGS)

INORGANICSFormer Lodi Manufactured Gas Plant

Lodi, CaliforniaL

ocat

ion

Sam

ple

ID

Dep

th (f

eet b

gs)

Sam

ple

Dat

e

Ant

imon

y

Ars

enic

Bar

ium

Ber

ylliu

m

Cad

miu

m

Chr

omiu

m

Cob

alt

Cop

per

Lea

d

Mer

cury

Mol

ybde

num

Nic

kel

Sele

nium

Silv

er

Tha

llium

Van

adiu

m

Zin

c

Cya

nide

, Tot

al

Am

mon

ia (a

s N)

Background PS-1-0' 0 11/13/2008 0.75 U 2.55 99.4 0.25 U 0.5 U 11.4 4.8 12.9 13.5 0.117 0.251 6.52 0.75 U 0.406 0.75 U 25.1 64.8 -- --Background PS-1-2' 2 11/13/2008 0.75 U 1.88 86.9 0.262 0.5 U 6.79 5.45 6.75 2.79 0.0835 U 0.25 U 5.38 0.75 U 0.25 U 0.75 U 24.8 25.9 -- --Background PS-2-0' 0 11/13/2008 0.75 U 3.06 118 0.25 U 0.638 12.4 4.7 14.7 16.2 0.129 0.25 U 7.02 0.774 0.324 0.75 U 26 73.3 -- --Background PS-2-2' 2 11/13/2008 0.75 U 4.17 112 0.369 0.5 U 9.05 7.26 8.35 3.39 0.0835 U 0.25 U 6.47 0.825 0.25 U 0.75 U 36.6 34.8 -- --Background PS-3-0' 0 11/13/2008 0.75 U 3.71 92 0.25 U 0.505 10.2 3.68 12.1 18.2 0.144 0.25 U 5.34 0.75 U 0.418 0.75 U 20.7 57.2 -- --Background PS-3-2' 2 11/13/2008 0.75 U 2.93 113 0.362 0.5 U 8.33 7.32 8.6 3.24 0.0835 U 0.25 U 6.55 0.75 U 0.25 U 0.75 U 34 33.6 -- --Background PS-4-0' 0 11/13/2008 0.75 U 1.39 109 0.25 U 0.5 U 10.2 4.04 13.2 22.6 0.0883 0.25 U 7.67 0.75 U 0.272 0.75 U 21.4 76.3 -- --Background PS-4-2' 2 11/13/2008 0.75 U 1.58 118 0.25 U 0.5 U 6.28 4.82 8.11 4.52 0.0835 U 0.25 U 5.16 0.75 U 0.25 U 0.75 U 21 44.3 -- --Background PS-5-0' 0 11/13/2008 0.75 U 1.99 102 0.25 U 0.5 U 10.6 4.84 12.5 21.6 0.0858 0.25 U 7.85 0.75 U 0.25 U 0.75 U 25.6 56.2 -- --Background PS-5-2' 2 11/13/2008 0.75 U 1.52 100 0.302 0.5 U 8.74 6.35 8.7 4.7 0.0835 U 0.25 U 6.78 0.75 U 0.25 U 0.75 U 28.2 32.2 -- --Background PS-6-0' 0 11/13/2008 0.75 U 1.94 97.3 0.253 0.5 U 10.1 4.81 10.9 20.2 0.0835 U 0.25 U 7.7 0.798 0.25 U 0.75 U 25.6 48.1 -- --Background PS-6-2' 2 11/13/2008 0.75 U 1.27 85.17 0.289 0.5 U 7.95 5.67 7.52 3.35 0.0835 U 0.25 U 6.11 0.75 U 0.25 U 0.75 U 25.9 26.5 -- --

On-site AK-1-30" 2.5 7/15/2010 0.75 U 0.795 84.4 0.25 U 0.5 U 6.06 5.81 7.05 39.6 0.0835 U 0.25 U 6.53 0.75 U 0.25 U 0.75 U 22.3 36.8 -- --On-site AK-1-38" 3.17 7/15/2010 0.75 U 0.956 83.1 0.25 U 0.5 U 6.65 6.31 7.5 24.4 0.0835 U 0.25 U 7.77 0.75 U 0.25 U 0.75 U 23.9 106 -- --On-site AK-2-20" 1.7 7/15/2010 0.75 U 0.75 U 95.3 0.25 U 0.5 U 5.99 6.23 7.03 31.7 0.0835 U 0.25 U 4.76 0.75 U 0.25 U 0.75 U 21.8 62 -- --On-site AK-2-34" 2.83 7/15/2010 0.75 U 0.926 62.9 0.25 U 0.5 U 6.04 4.91 5.59 6.69 0.0835 U 0.25 U 3.75 0.75 U 0.25 U 0.75 U 23.2 20.7 -- --On-site AK-3-17" 1.42 7/15/2010 0.75 U 1.23 81 0.25 U 0.553 6.79 5.19 6.58 2.77 0.0835 U 0.25 U 4.66 0.75 U 0.25 U 0.75 U 24.9 334 -- --On-site SB-1-0' 0 10/15/2008 0.75 U 2.18 84.5 0.25 U 0.5 U 10.5 4.49 9.18 39.3 0.0835 U 0.25 U 4.58 0.75 U 0.25 U 0.75 U 22.2 384 0.5 U --On-site SB-1-3' 3 10/15/2008 0.75 U 0.75 U 75.4 0.268 0.5 U 6.26 5.12 6.49 5.55 0.0835 U 0.25 U 4.19 0.75 U 0.25 U 0.75 U 23.1 24.6 0.5 U --On-site SB-1-6' 6 10/15/2008 0.75 U 0.75 U 57.1 0.25 U 0.5 U 4.86 4.51 4.81 1.93 0.0835 U 0.25 U 3.48 0.75 U 0.25 U 0.75 U 20.7 19.9 0.5 U --On-site SB-1-9' 9 10/15/2008 0.75 U 6.03 96.3 0.424 0.5 U 8.33 9.19 9.49 3.56 0.0835 U 0.25 U 7.38 0.75 U 0.25 U 0.75 U 48.3 36.8 0.5 U --On-site SB-2-0' 0 10/15/2008 0.75 U 0.75 U 103 0.267 0.5 U 6.16 5.53 7.07 2.64 0.0835 U 0.25 U 4.6 0.75 U 0.25 U 0.75 U 23.6 25.9 0.5 U --On-site SB-2-0' (DUP-6) 0 10/15/2008 0.75 U 0.807 109 0.268 0.5 U 6.01 5.85 7.63 2.76 0.0835 U 0.25 U 4.57 0.75 U 0.25 U 0.75 U 22.9 27.4 0.5 U --On-site SB-2-3' 3 10/15/2008 0.75 U 1.19 85.3 0.3 0.5 U 7.11 5.16 7.15 2.22 0.0835 U 0.25 U 5.17 0.75 U 0.25 U 0.75 U 26.5 29.9 0.5 U --On-site SB-2-6' 6 10/15/2008 0.75 U 0.904 55.6 0.25 U 0.5 U 5.87 4.18 6.5 1.82 0.0835 U 0.25 U 3.72 0.75 U 0.25 U 0.75 U 22.7 24.6 0.5 U --On-site SB-2-9' 9 10/15/2008 0.75 U 1.97 76.2 0.263 0.5 U 6.58 4.93 6.97 1.79 0.0835 U 0.25 U 7.05 0.75 U 0.25 U 0.75 U 26.8 23.8 0.5 U --On-site SB-5-0' 0 10/15/2008 14.7 5.36 126 0.504 0.738 10.2 6.71 20.2 1100 0.14 0.25 U 51.1 0.75 U 0.25 U 0.75 U 54.9 191 5.2 --On-site SB-5-6' 6 10/15/2008 0.75 U 1.83 69.2 0.321 0.5 U 7.11 5.38 6.99 2.24 0.0835 U 0.25 U 5.61 0.75 U 0.25 U 0.75 U 32 33.9 0.5 U --On-site SB-5-9' 9 10/15/2008 0.75 U 1.39 96.7 0.287 0.5 U 7.19 6.25 8.06 2.72 0.0835 U 0.25 U 4.96 0.75 U 0.25 U 0.75 U 28.2 44 0.5 U --On-site SB-6-7.5' 7.5 10/14/2008 0.75 U 0.858 49.9 0.41 0.602 5.02 6.62 30.3 12.2 0.0835 U 0.625 194 0.75 U 0.25 U 0.75 U 103 54.6 2.7 --On-site SB-6-9.5' 9.5 10/14/2008 0.75 U 0.75 U 38.4 0.25 U 0.5 U 1.54 0.618 2.22 26.6 0.0835 U 0.25 U 18.6 0.75 U 0.25 U 0.75 U 16.3 20.8 6.2 --On-site SB-7-0' 0 10/15/2008 0.765 2.37 119 0.25 U 0.5 U 7.08 3.57 25.9 988 0.146 0.25 U 14.3 0.75 U 0.25 U 0.75 U 28.3 121 2 --On-site SB-7-3' 3 10/15/2008 0.75 U 1.91 92.4 0.361 0.5 U 8.47 6.26 8.32 31.9 0.0835 U 0.25 U 6.62 0.75 U 0.25 U 0.75 U 32 43.5 0.5 U --On-site SB-7-6' 6 10/15/2008 0.75 U 1.99 116 0.309 0.5 U 13.1 7.36 13.5 227 0.0835 U 0.25 U 9.52 0.75 U 0.25 U 0.75 U 34.4 72.9 0.5 U --On-site SB-7-6' (DUP-4) 6 10/15/2008 0.75 U 2.33 93.7 0.394 0.5 U 8.92 15.8 8.87 26.5 0.0835 U 0.25 U 8.39 0.75 U 0.25 U 0.75 U 33.6 54.8 0.5 U --On-site SB-7-9' 9 10/15/2008 0.75 U 6.79 148 0.412 0.5 U 7.77 10.6 11.6 4.14 0.0835 U 0.25 U 9.09 0.75 U 0.25 U 0.75 U 51.5 45.4 0.5 U --On-site SB-8-0' 0 10/15/2008 0.75 U 0.75 U 67.2 0.25 U 0.5 U 5.47 3.39 5.44 3.3 0.0835 U 0.25 U 3.94 0.75 U 0.25 U 0.75 U 18.1 24 0.5 U --On-site SB-8-3' 3 10/15/2008 0.75 U 0.75 U 82.9 0.25 U 0.5 U 5.92 8.3 10.5 3.99 0.0835 U 0.25 U 4.62 0.75 U 0.396 0.75 U 19.4 22.7 0.5 U --On-site SB-8-5.5' 5.5 10/15/2008 4.81 5.66 84.9 0.25 U 2.23 8 6.6 53 97.3 0.0835 U 1.06 58.3 0.75 U 0.25 U 0.75 U 24.8 574 13 --On-site SB-8-6' 6 10/15/2008 0.75 U 0.75 U 97.7 0.25 U 0.5 U 7.3 5.12 4.4 2.54 0.0835 U 0.25 U 5.07 0.75 U 0.25 U 0.75 U 37.4 72.6 1 --On-site SB-8-9' 9 10/15/2008 0.75 U 5.43 119 0.665 0.5 U 17.6 7.94 11 5.6 0.0835 U 0.25 U 11.5 0.75 U 0.25 U 0.75 U 50.3 38.4 0.5 U --On-site SB-9-0' 0 10/13/2008 2 3.49 107 0.317 0.542 11.2 6.43 20.3 153 0.0835 U 0.25 U 14.4 0.75 U 0.25 U 0.75 U 33.7 119 0.5 U --On-site SB-9-3' 3 10/13/2008 0.75 U 1.97 116 0.343 0.5 U 7.25 6.48 8.64 13.1 0.0835 U 0.25 U 5.67 0.75 U 0.25 U 0.75 U 30.6 39.1 0.5 U --

Att_A_Tables_Lodi Page 1 of 7 IRIS ENVIROMENTAL



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On-site SB-9-3' (DUP-1) 3 10/13/2008 0.75 U 1.8 106 0.376 0.5 U 7.53 7.18 8.66 4.26 0.0835 U 0.25 U 5.64 0.75 U 0.25 U 0.75 U 32.7 33.6 0.5 U --On-site SB-9-6' 6 10/13/2008 0.75 U 1.93 107 0.33 0.5 U 7.41 6.51 8.87 6.93 0.0835 U 0.25 U 5.61 0.75 U 0.25 U 0.75 U 32.8 37 0.5 U --On-site SB-9-9' 9 10/13/2008 0.75 U 1.23 55.8 0.25 U 0.5 U 3.91 4.07 5.67 2.36 0.0835 U 0.25 U 2.95 0.75 U 0.25 U 0.75 U 20.7 20.2 0.5 U --On-site SB-9-9' (DUP-2) 9 10/13/2008 0.75 U 2.29 135 0.394 3.35 9.32 7.46 10.6 3.79 0.0835 U 0.25 U 16.8 0.75 U 0.25 U 0.75 U 38.4 49.4 0.5 U --On-site SB-10-1.5' 1.5 10/15/2008 0.75 U 1.21 88.3 0.25 U 0.5 U 3.71 139 123 56.6 0.0835 U 0.25 U 12.3 0.75 U 3.57 0.75 U 13.7 46.4 0.5 U --On-site SB-10-3' 3 10/15/2008 0.75 U 1.03 87 0.309 0.5 U 6.56 16.7 17 9.4 0.0835 U 0.25 U 5.28 0.75 U 0.25 U 0.75 U 27.6 27.2 0.5 U --On-site SB-10-3' (DUP-5) 3 10/15/2008 0.75 U 0.816 91.4 0.3 0.5 U 6.45 7.3 9.06 4.57 0.0835 U 0.25 U 4.9 0.75 U 0.25 U 0.75 U 28.4 27.5 0.5 U --On-site SB-10-6' 6 10/15/2008 0.75 U 1.15 87 0.282 0.5 U 6.67 7.29 7.26 2.79 0.0835 U 0.25 U 4.48 0.75 U 0.25 U 0.75 U 30.8 25.2 0.5 U --On-site SB-10-9' 9 10/15/2008 0.75 U 4.92 109 0.372 0.5 U 8.43 8.56 11.6 3.42 0.0835 U 0.25 U 6.53 0.75 U 0.25 U 0.75 U 44.4 41 0.5 U --On-site SB-13-0' 0 10/13/2008 2.4 3.61 146 0.25 U 0.5 U 6.37 3.22 16.5 386 0.389 0.25 U 9.31 0.75 U 0.25 U 0.75 U 25.4 102 3.1 --On-site SB-13-3' 3 10/13/2008 0.75 U 1.75 109 0.25 U 0.5 U 7.04 4.45 9.84 116 0.0835 U 0.25 U 5.31 0.75 U 0.25 U 0.75 U 25.6 51.7 11 --On-site SB-13-6' 6 10/13/2008 0.75 U 1.55 87.4 0.25 U 0.5 U 5.86 3.25 10.1 46.6 0.0835 U 0.25 U 10.4 0.75 U 0.25 U 0.75 U 31.7 41.4 0.5 U --On-site SB-13-9' 9 10/13/2008 0.75 U 2.42 95.8 0.302 0.5 U 9.47 9.04 9.61 3.36 0.0835 U 0.25 U 7.09 0.75 U 0.25 U 0.75 U 29.4 30.1 0.5 U --On-site SB-14-0' 0 10/13/2008 0.75 U 3.07 137 0.324 0.713 10.9 7.02 27 145 0.0835 U 0.25 U 15.7 0.75 U 0.25 U 0.75 U 27.9 122 4.2 --On-site SB-14-2' 2 10/13/2008 0.75 U 2.3 96.2 0.25 U 0.5 U 7.64 3.95 23.2 143 0.0835 U 0.25 U 12.3 0.75 U 0.25 U 0.75 U 23.8 61.3 7.7 --On-site SB-14-3' 3 10/13/2008 0.75 U 2.26 123 0.379 0.5 U 8.39 7.32 11.9 37.9 0.0835 U 0.25 U 9.01 0.75 U 0.25 U 0.75 U 32.6 51.1 0.5 U --On-site SB-14-6' 6 10/13/2008 0.75 U 2.26 104 0.318 0.5 U 6.9 7.06 8.13 10.1 0.0835 U 0.25 U 5.79 0.75 U 0.25 U 0.75 U 32 31.7 0.5 U --On-site SB-14-9' 9 10/13/2008 0.75 U 2.21 45.6 0.261 0.5 U 8.59 4.54 8.4 2.58 0.0835 U 0.25 U 7.51 0.75 U 0.25 U 0.75 U 24.8 21.5 0.5 U --On-site SB-15-0' 0 10/13/2008 0.75 U 2.31 106 0.266 0.5 U 8.86 5.49 20 261 0.0835 U 0.25 U 14.2 0.75 U 0.25 U 0.75 U 25.3 106 0.5 U --On-site SB-15-3' 3 10/13/2008 0.75 U 2.07 104 0.297 0.5 U 8.24 5.49 13 55.3 0.0835 U 0.25 U 8.14 0.75 U 0.25 U 0.75 U 26.5 50.1 0.5 U --On-site SB-15-6' 6 10/13/2008 0.75 U 2.63 124 0.445 0.5 U 8.6 7.98 10.7 27.3 0.0835 U 0.25 U 8.08 0.75 U 0.25 U 0.75 U 37.7 45.3 0.5 U --On-site SB-15-9' 9 10/13/2008 0.75 U 0.935 35.2 0.25 U 0.5 U 2.43 2.53 3.29 1.09 0.0835 U 0.25 U 2.06 0.75 U 0.25 U 0.75 U 11.5 12.7 0.5 U --On-site SB-16-1' 1 10/13/2008 0.75 U 2.31 267 0.261 0.5 U 9.27 4.26 49.9 371 0.0835 U 0.25 U 8.64 0.75 U 0.25 U 0.75 U 26.6 73 0.61 --On-site SB-16-3' 3 10/13/2008 0.75 U 0.923 61.8 0.25 U 0.5 U 4.57 3.63 6.6 32 0.0835 U 0.25 U 3.62 0.75 U 0.25 U 0.75 U 16.1 21.4 0.5 U --On-site SB-16-6' 6 10/13/2008 0.75 U 2.63 131 0.369 0.5 U 8.23 6.94 8.67 4.87 0.0835 U 0.25 U 6.56 0.75 U 0.25 U 0.75 U 36.9 35 0.5 U --On-site SB-16-9' 9 10/13/2008 0.75 U 4.1 95.8 0.306 0.5 U 6.03 7.76 8.49 3.14 0.0835 U 0.25 U 5.09 0.75 U 0.25 U 0.75 U 37 39.6 0.5 U --On-site SB-17-1' 1 11/5/2009 0.75 U 5.04 91.1 0.25 U 0.5 U 10.5 4.62 19 863 0.0835 U 0.25 U 16.4 0.75 U 0.25 U 0.75 U 38.8 62.1 9.3 --On-site SB-18-0' 0 11/4/2009 0.75 U 2.8 91 0.25 U 0.5 U 2.74 1.53 55.6 268 0.144 0.988 8.7 0.75 U 0.473 0.75 U 8.44 30.4 13 --On-site SB-18-8' 8 11/4/2009 0.75 U 3.54 153 0.271 0.5 U 11 9.19 8.86 3.42 0.0133 J 0.25 U 9.52 0.75 U 0.25 U 0.75 U 40.7 47.8 0.5 U --On-site SB-19-5' 5 11/5/2009 0.75 U 2.68 96.5 0.25 U 0.5 U 7.1 9.37 5.5 1.99 0.0835 U 0.25 U 6.78 0.75 U 0.25 U 0.75 U 32.3 41.4 0.5 U --On-site SB-20-0' 0 11/4/2009 0.75 U 2.9 131 0.25 U 0.5 U 8.78 5.91 19.9 90.6 0.107 0.25 U 10.6 0.75 U 0.25 U 0.75 U 32.3 66.1 0.97 --On-site SB-21-0' 0 11/3/2009 0.75 U 8.46 110 0.183 J 0.173 J 10.2 6.2 20.5 77.8 0.0284 J 0.25 U 10.1 0.75 U 0.25 U 0.75 U 23.8 168 -- --On-site SB-21-5' 5 11/2/2009 0.75 U 2.85 87.6 0.157 J 0.5 U 6.73 6.29 5.68 1.93 0.0412 J 0.25 U 4.6 0.75 U 0.25 U 0.75 U 29.4 35.2 -- --On-site SB-21-10' 10 11/2/2009 0.75 U 4.54 99.4 0.213 J 0.5 U 7.59 7.23 6.92 2.86 0.00895 J 0.1 J 5.28 0.75 U 0.25 U 0.75 U 33.5 45.8 -- --On-site SB-22-0' 0 11/2/2009 0.75 U 2.88 146 0.226 J 0.5 U 8.23 6.82 12.1 323 0.0332 J 0.25 U 8.05 0.75 U 0.25 U 0.75 U 29.6 73.1 -- --On-site SB-22-5' 5 11/2/2009 0.75 U 2.7 92.1 0.164 J 0.5 U 7.19 6.62 5.64 2.27 0.00795 J 0.25 U 4.82 0.75 U 0.25 U 0.75 U 30.8 38.9 -- --On-site SB-22-10' 10 11/2/2009 0.75 U 6.09 210 0.33 0.5 U 13.6 11.5 11.6 4.5 0.0125 J 0.25 U 11.9 0.75 U 0.25 U 0.75 U 44.7 76 -- --On-site SB-23-0' 0 11/2/2009 0.75 U 7.16 145 0.159 0.5 U 13.7 5.15 91.5 1340 2.77 0.153 J 60 0.75 U 0.25 U 0.75 U 100 92.4 -- --On-site SB-23-10' 10 11/2/2009 0.75 U 4.48 74.9 0.223 J 0.5 U 9.9 4.23 5.04 2.51 0.00635 J 0.25 U 8.26 0.75 U 0.25 U 0.75 U 30.5 51.4 -- --On-site SB-24-0' 0 11/2/2009 0.75 U 2.45 82.3 0.201 J 0.5 U 12.4 6.79 11.3 12.3 0.00925 J 0.25 U 11.5 0.75 U 0.25 U 0.75 U 29.1 51.3 -- --On-site SB-24-5' 5 11/2/2009 0.75 U 3.59 139 0.249 J 0.5 U 9.82 8.89 9.2 3.2 0.00735 J 0.25 U 6.98 0.75 U 0.25 U 0.75 U 42.7 48.9 -- --On-site SB-24-10' 10 11/2/2009 0.75 U 5.73 99 0.256 0.5 U 12.3 6.58 8.56 3.93 0.0175 J 0.252 9.9 0.75 U 0.25 U 0.75 U 38.2 40.7 -- --On-site SB-25-0' 0 11/2/2009 0.75 U 4.56 114 0.184 J 0.5 U 9.76 5.93 24.5 180 0.0399 0.25 U 13.2 0.75 U 0.25 U 0.75 U 29 121 -- --




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On-site SB-25-5' 5 11/2/2009 0.75 U 3.72 193 0.258 0.5 U 9.1 7.72 8.02 2.9 0.00967 J 0.25 U 6.63 0.75 U 0.25 U 0.75 U 42.6 49.2 -- --On-site SB-25-10' 10 11/2/2009 0.75 U 2.53 67 0.105 0.5 U 4.25 3.62 5.96 1.64 0.00835 J 0.25 U 3.23 0.75 U 0.25 U 0.75 U 20.9 34.1 -- --On-site SB-34-0' 0 11/3/2009 0.75 U 4.51 112 0.172 J 0.5 U 12.1 5.54 17.8 207 0.0436 J 0.103 J 14.6 0.75 U 0.25 U 0.75 U 27.2 115 -- --On-site SB-34-8' 8 11/3/2009 0.75 U 2.87 116 0.168 J 0.5 U 8.53 4.96 10.8 2.41 0.0205 J 0.239 J 6.07 0.75 U 0.25 U 0.75 U 36.2 48.6 -- --On-site SB-48-1.5' 1.5 7/13/2010 0.75 U 0.913 92.6 0.25 U 0.5 U 6.02 19.7 8.52 24.6 0.0835 U 0.25 U 15.5 0.75 U 0.25 U 0.75 U 30.1 34.5 -- --On-site SB-48-3' 3 7/13/2010 0.75 U 1.49 112 0.25 U 0.5 U 8.49 15.3 8.81 7.87 0.0835 U 0.25 U 7.67 0.75 U 0.25 U 0.75 U 33.6 37.2 -- --On-site SB-48-6' 6 7/13/2010 0.75 U 2.22 119 0.25 U 0.5 U 7.99 6.83 7.37 3.38 0.0835 U 0.25 U 5.55 0.75 U 0.25 U 0.75 U 35.2 36.6 -- --On-site SB-49-3' 3 7/13/2010 0.75 U 1.19 101 0.25 U 0.5 U 6.25 5.72 8.2 10.8 0.0835 U 0.25 U 17 0.75 U 0.25 U 0.75 U 30.3 29.4 -- --On-site SB-49-4' 4 7/13/2010 0.75 U 1.29 86 0.25 U 0.5 U 6.43 6.17 11.7 86.2 0.0835 U 0.25 U 56 0.75 U 0.25 U 0.75 U 56.8 32.8 -- --On-site SB-49-6' 6 7/13/2010 0.75 U 1.8 80.1 0.25 U 0.5 U 6.85 6.75 6.11 9.11 0.0835 U 0.25 U 8.51 0.75 U 0.25 U 0.75 U 31.8 27.4 -- --On-site SB-50-1.5' 1.5 7/13/2010 0.75 U 2.1 111 0.25 U 0.5 U 8 6.06 14.9 15.3 0.0835 U 0.25 U 17.8 0.75 U 0.25 U 0.75 U 30.2 52.9 -- --On-site SB-50-3' 3 7/13/2010 0.75 U 2.8 97.8 0.25 U 0.5 U 8.3 8.49 8.32 3.12 0.0835 U 0.25 U 5.92 0.75 U 0.25 U 0.75 U 36.3 29.3 -- --On-site SB-50-6' 6 7/13/2010 0.75 U 5.03 125 0.25 U 0.5 U 8.73 7.51 7.56 3.41 0.0835 U 0.25 U 5.74 0.75 U 0.25 U 0.75 U 41.7 32.7 -- --On-site SB-51-1.5' 1.5 7/13/2010 0.75 U 1.83 68.8 0.25 U 0.5 U 8.25 5.55 10.5 11.4 0.0835 U 0.25 U 36 0.75 U 0.25 U 0.75 U 28.2 45.3 -- --On-site SB-51-3' 3 7/13/2010 0.75 U 2.15 124 0.25 U 0.5 U 8.35 6.57 9.58 6.7 0.0835 U 0.25 U 7.75 0.75 U 0.25 U 0.75 U 29.7 33.5 -- --On-site SB-51-6.5' 6.5 7/13/2010 0.75 U 1.63 61.7 0.25 U 0.5 U 6.98 5.13 9.81 15.1 0.0835 U 0.25 U 7.35 0.75 U 0.25 U 0.75 U 20.4 124 -- --On-site SB-51-9' 9 7/13/2010 0.75 U 3.98 74 0.25 U 0.5 U 9.75 5.7 9.89 3.59 0.0835 U 0.25 U 7.26 0.75 U 0.25 U 0.75 U 35.3 25.2 -- --On-site SB-52-1' 1 7/12/2010 0.75 U 1.18 88.2 0.25 U 0.5 U 5.99 5.2 6.21 6.78 0.0835 U 0.25 U 4.25 0.75 U 0.25 U 0.75 U 23.2 25.2 -- --On-site SB-52-3' 3 7/12/2010 0.75 U 2.69 90.7 0.25 U 0.5 U 7.25 6.52 6.71 4.04 0.0835 U 0.25 U 4.98 0.75 U 0.25 U 0.75 U 31.2 26.2 -- --On-site SB-52-6' 6 7/12/2010 0.75 U 2.3 79.4 0.25 U 0.5 U 7.22 6.85 6.38 2.63 0.0835 U 0.25 U 4.65 0.75 U 0.25 U 0.75 U 35.9 24.2 -- --On-site SB-52-9' 9 7/12/2010 0.75 U 4.94 90.4 0.26 0.5 U 12.9 6.43 12.3 4.41 0.0835 U 0.25 U 8.71 0.75 U 0.25 U 0.75 U 40.8 31.1 -- --On-site SB-53-0.5' 0.5 7/12/2010 0.75 U 2.59 127 0.261 0.5 U 10.4 8.73 13.2 39.1 0.0835 U 0.25 U 16.8 0.75 U 0.25 U 0.75 U 39.7 109 -- --On-site SB-53-3' 3 7/13/2010 0.75 U 3.52 112 0.292 0.5 U 11.1 9.03 8.78 5.92 0.0835 U 0.25 U 9.48 0.75 U 0.25 U 0.75 U 44.1 46.2 -- --On-site SB-53-6' 6 7/13/2010 0.75 U 4.03 79.8 0.25 U 0.5 U 8.7 7.4 10.6 14.4 0.0835 U 0.25 U 7.4 0.75 U 0.25 U 0.75 U 38.7 40.6 -- --On-site SB-53-9' 9 7/13/2010 0.75 U 4.47 104 0.25 U 0.5 U 10.9 7.99 8.67 4.04 0.0835 U 0.25 U 15.9 0.75 U 0.25 U 0.75 U 34.8 55.2 -- --On-site SB-54-1' 1 7/12/2010 0.75 U 2.87 117 0.25 U 0.5 U 9.19 5.2 23.7 9.21 0.0835 U 0.25 U 7.47 0.75 U 0.25 U 0.75 U 54.9 35.9 -- --On-site SB-54-3' 3 7/12/2010 0.795 2.35 111 0.257 0.5 U 8.79 7.15 11.6 7.95 0.0835 U 0.25 U 10.1 0.75 U 0.25 U 0.75 U 40.2 50.2 -- --On-site SB-54-6' 6 7/12/2010 0.75 U 2.22 76.3 0.25 U 0.5 U 7.36 7.14 9.86 2.82 0.0835 U 0.25 U 6.94 0.75 U 0.25 U 0.75 U 34.7 46.1 -- --On-site SB-54-9' 9 7/12/2010 0.75 U 3.44 137 0.25 U 0.5 U 8.38 9.87 11 4.75 0.0835 U 0.25 U 7.81 0.75 U 0.25 U 0.75 U 46.2 43.7 -- --On-site SB-55-1.5' 1.5 7/13/2010 1.44 1.46 109 0.25 U 0.5 U 8.8 5.52 7.93 3.75 0.0835 U 0.25 U 5.07 0.75 U 0.25 U 0.75 U 30 36.7 0.5 U 45On-site SB-55-3' 3 7/13/2010 1.94 2.32 101 0.25 U 0.5 U 9.59 5.62 8.19 4.04 0.0835 U 0.25 U 5.22 0.75 U 0.25 U 0.75 U 33.4 37.4 0.5 U 50On-site SB-55-6' 6 7/13/2010 0.75 U 3.23 101 0.25 U 0.5 U 13.4 9.81 9.61 3.47 0.0835 U 0.767 8.03 0.75 U 0.25 U 0.75 U 39.5 47.3 0.5 U 17On-site SB-55-9' 9 7/13/2010 0.75 U 1.06 52.9 0.25 U 0.5 U 7.93 3.86 6.67 2.75 0.0835 U 0.25 U 6.35 0.75 U 0.25 U 0.75 U 22.7 24.3 0.5 U 5.6On-site SB-56-0.5' 0.5 7/14/2010 0.75 U 2.78 105 0.25 U 0.5 U 6.66 3.85 7.85 346 0.0835 U 0.25 U 4.58 0.75 U 0.25 U 0.75 U 23.6 25.5 3.8 310On-site SB-56-3' 3 7/14/2010 1.41 1.83 90.5 0.25 U 0.5 U 8.42 5.22 7.23 6.96 0.0835 U 0.25 U 4.6 0.75 U 0.25 U 0.75 U 34.8 33.6 0.51 200On-site SB-56-6' 6 7/14/2010 0.75 U 4.35 108 0.25 U 0.5 U 6.65 8.24 8.67 4.16 0.0835 U 0.25 U 4.99 0.75 U 0.25 U 0.75 U 41.2 50.1 0.5 U 56On-site SB-56-9' 9 7/14/2010 0.75 U 3.57 64.5 0.25 U 0.5 U 10.6 5.42 9.64 3.5 0.0835 U 0.25 U 9.1 0.75 U 0.25 U 0.75 U 33.6 25.3 0.5 U 11On-site SS-1 0 2/24/2006 0.5 U 2 93.7 0.2 U 0.5 U 8.7 5.3 14.5 23.9 0.21 0.64 5.4 0.5 U 0.58 2 U 30.2 136 -- --On-site SS-2 0 2/24/2006 0.97 1.3 55.2 0.2 U 0.5 U 6.7 2.1 26.4 24800 0.1 U 0.5 U 6.8 0.5 U 0.38 2 U 12.1 70.4 -- --On-site SS-3 0 2/24/2006 1.4 4.7 57.8 0.2 U 0.5 4.6 1.8 24.1 451 0.23 0.5 U 3 0.5 U 0.24 7.8 7.8 47.1 2 --On-site SS-4 0 2/24/2006 0.54 3.7 191 0.2 U 0.5 U 29.8 7.4 21.8 691 0.1 U 0.5 U 16.7 0.5 U 0.32 2 U 45.2 289 -- --On-site SS-5 0 2/24/2006 0.5 U 2.8 114 0.2 U 0.5 U 12.3 7 15.3 147 0.1 U 1.1 9.5 0.5 U 0.39 2 U 39.2 135 -- --On-site SS-6 0 2/24/2006 0.5 U 2.5 59.8 0.2 U 0.5 U 17.3 6.5 12.4 3.2 0.1 U 0.77 16.6 0.5 U 0.23 2 U 37.5 21.6 -- --




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On-site SS-7 0 2/24/2006 49.6 9.2 132 0.2 U 0.5 U 12.5 7.9 48.4 1400 0.1 U 1.4 103 0.5 U 0.46 2 U 154 145 -- --On-site SS-8 0 2/24/2006 26.7 7.5 104 0.2 U 0.5 U 14.2 6.9 180 2320 0.11 1.6 76.4 0.5 U 0.17 2 U 58.7 140 -- --On-site SS-9 0 2/24/2006 0.5 U 3.2 106 0.21 0.5 U 16.1 6.4 19.9 165 0.1 U 1.1 14 0.5 U 0.23 2 U 40.7 63.7 -- --On-site SS-10 0 7/14/2010 -- -- -- -- -- -- -- -- 599 -- -- -- -- -- -- -- -- -- --On-site TP-1-0.5' 0.5 7/12/2010 0.75 U 1.44 93.3 0.25 U 0.5 U 5.91 4.42 7.13 108 0.0835 U 0.25 U 4.53 0.75 U 0.25 U 0.75 U 19.6 39.6 -- --On-site TP-1-3' 3 7/12/2010 0.75 U 0.941 88.8 0.25 U 0.5 U 6.43 6.15 6.7 9.75 0.0835 U 0.25 U 4.55 0.75 U 0.25 U 0.75 U 27 27.2 -- --On-site TP-1-6' 6 7/12/2010 0.75 U 0.983 53.1 0.25 U 0.5 U 4.7 4.68 4.7 4.29 0.0835 U 0.25 U 3.54 0.75 U 0.25 U 0.75 U 21.7 20.1 -- --On-site TP-2-0.5' 0.5 7/12/2010 0.75 U 2.12 100 0.25 U 0.5 U 9.79 6.08 16.4 200 0.0835 U 0.25 U 10.8 0.75 U 0.25 U 0.75 U 23.1 60.3 -- --On-site TP-2-3' 3 7/12/2010 0.75 U 1.61 92.3 0.25 U 0.5 U 7.4 5.99 9.46 39.3 0.0835 U 0.25 U 5.62 0.75 U 0.25 U 0.75 U 25.5 35.7 -- --On-site TP-2-6' 6 7/12/2010 0.75 U 1.39 82.4 0.25 U 0.5 U 8 6.38 7.35 28.1 0.0835 U 0.25 U 5.74 0.75 U 0.25 U 0.75 U 31.8 29 -- --On-site TP-2-9' 9 7/12/2010 0.75 U 0.961 59.5 0.25 U 0.5 U 6.26 5.62 5.33 8.11 0.0835 U 0.25 U 4.13 0.75 U 0.25 U 0.75 U 27.7 23.4 -- --On-site TP-3-0.5' 0.5 7/12/2010 0.75 U 2.07 110 0.25 U 0.5 U 7.11 4.57 20.4 347 0.0835 U 0.25 U 4.79 0.75 U 0.25 U 0.75 U 24.2 61.9 -- --On-site TP-3-3' 3 7/12/2010 0.75 U 2.08 89.8 0.25 U 0.5 U 7.41 5.83 8.75 75.1 0.0835 U 0.25 U 5.32 0.75 U 0.25 U 0.75 U 27.2 35.6 -- --On-site TP-3-6' 6 7/12/2010 0.75 U 1.55 76.8 0.25 U 0.5 U 6.81 5.98 6.09 19.9 0.0835 U 0.25 U 4.66 0.75 U 0.25 U 0.75 U 29.2 25.8 -- --On-site TP-4-0.5' 0.5 7/12/2010 0.75 U 0.867 104 0.25 U 0.5 U 6.35 5.69 7.42 8.68 0.0835 U 0.25 U 4.76 0.75 U 0.25 U 0.75 U 23.4 32.6 -- --On-site TP-4-3' 3 7/12/2010 0.75 U 1.47 62.4 0.25 U 0.5 U 5.81 5.77 4.84 4.69 0.0835 U 0.25 U 3.78 0.75 U 0.25 U 0.75 U 25.9 21.9 -- --On-site TP-4-6' 6 7/12/2010 0.75 U 1.73 61.8 0.25 U 0.5 U 6.33 5.61 5.24 2.83 0.0835 U 0.25 U 4.28 0.75 U 0.25 U 0.75 U 29.1 21.9 -- --On-site TP-5-0.5' 0.5 7/13/2010 0.75 U 0.988 109 0.25 U 0.5 U 6.53 6.82 8.41 92.7 0.0835 U 0.25 U 9.24 0.75 U 0.25 U 0.75 U 22.6 50.9 -- --On-site TP-5-3' 3 7/13/2010 0.75 U 1.17 90 0.25 U 0.5 U 6.92 6.23 6.99 8.92 0.0835 U 0.25 U 5.19 0.75 U 0.25 U 0.75 U 28.6 29.8 -- --On-site TP-5-6' 6 7/13/2010 0.75 U 2.62 86.2 0.25 U 0.5 U 7.28 6.53 6.26 3.1 0.0835 U 0.25 U 4.73 0.75 U 0.25 U 0.75 U 33.1 25.8 -- --On-site TP-6-0.5' 0.5 7/13/2010 1.13 4.78 123 0.25 U 0.5 U 11 6.75 24.5 701 0.158 0.25 U 9.38 0.75 U 0.25 U 0.75 U 25.1 185 -- --On-site TP-6-3' 3 7/13/2010 0.75 U 1.66 95.3 0.25 U 0.5 U 7.73 6.78 8.29 57.6 0.0835 U 0.25 U 5.63 0.75 U 0.25 U 0.75 U 28.5 40.2 -- --On-site TP-6-6' 6 7/13/2010 0.75 U 1.83 71.3 0.25 U 0.5 U 7.2 6.48 6.05 8.05 0.0835 U 0.25 U 4.82 0.75 U 0.25 U 0.75 U 29.4 26.9 -- --On-site TP-7-25S 1.17 7/12/2010 0.75 U 0.75 U 162 0.331 0.5 U 7.06 9.66 8.05 259 0.0835 U 0.25 U 20.1 0.75 U 0.25 U 0.75 U 26.7 127 -- --On-site TP-7-25D 2.67 7/12/2010 0.75 U 1.48 109 0.25 U 0.5 U 7.36 8.46 7.21 22.4 0.0835 U 0.25 U 6.92 0.75 U 0.25 U 0.75 U 28.6 44.1 -- --On-site TP-7-40S 1.17 7/12/2010 0.75 U 2.56 106 0.25 U 0.5 U 7.23 5.47 10.7 11.9 0.0835 U 0.25 U 3.71 0.75 U 0.25 U 0.75 U 44.6 28.3 -- --On-site TP-7-40D 2.67 7/12/2010 0.75 U 2.03 103 0.25 U 0.5 U 10.3 5.54 11.1 4.08 0.0835 U 0.25 U 4.37 0.75 U 0.25 U 0.75 U 43 32.9 -- --On-site TP-8-0.5' 0.5 7/13/2010 6.25 2.83 79.5 0.25 U 0.5 U 7.02 5.32 13 250 0.0835 U 0.25 U 13.4 0.75 U 0.25 U 0.75 U 23.7 75 -- --On-site TP-8-3' 3 7/13/2010 0.75 U 2.03 105 0.25 U 0.5 U 7.11 6.37 8.46 7.36 0.0835 U 0.25 U 7.03 0.75 U 0.25 U 0.75 U 29.1 33.9 -- --On-site TP-8-6' 6 7/13/2010 0.75 U 1.54 97 0.25 U 0.5 U 7.37 8.2 6.79 4.04 0.0835 U 0.25 U 5.67 0.75 U 0.25 U 0.75 U 35.7 28.6 -- --On-site TP-9-0.5' 0.5 7/13/2010 0.75 U 3.3 146 0.25 U 0.5 U 11.1 8.84 46.2 168 0.215 0.361 155 0.75 U 0.25 U 0.75 U 157 107 -- --On-site TP-9-3' 3 7/13/2010 0.75 U 2.13 113 0.25 U 0.5 U 7.26 7.35 14.4 24.9 0.0835 U 0.25 U 30.7 0.75 U 0.25 U 0.75 U 65.6 42.6 -- --On-site TP-9-6' 6 7/13/2010 0.75 U 2 109 0.25 U 0.5 U 7.01 6.91 6.7 5.49 0.0835 U 0.25 U 6.81 0.75 U 0.25 U 0.75 U 36.8 27.2 -- --On-site TP-9-9' 9 7/13/2010 0.75 U 1.1 75.5 0.25 U 0.5 U 5.53 5.76 5.79 2.91 0.0835 U 0.25 U 4.59 0.75 U 0.25 U 0.75 U 28 22 -- --On-site TP-10-0.5' 0.5 7/13/2010 0.75 U 1.69 108 0.25 U 0.5 U 7.9 6.13 11.4 30.7 0.0835 U 0.25 U 4.96 0.75 U 0.25 U 0.75 U 30.4 38.3 -- --On-site TP-10-3' 3 7/13/2010 0.75 U 2.23 99.6 0.25 U 0.5 U 8.4 6.17 14.6 15.9 0.0835 U 0.25 U 5.13 0.75 U 0.25 U 0.75 U 31.6 37.6 -- --On-site TP-10-6' 6 7/13/2010 0.75 U 2.25 105 0.489 0.5 U 7.66 9.34 7.9 4.92 0.0835 U 0.25 U 27.3 0.75 U 0.25 U 0.75 U 34.3 108 -- --On-site TP-11-0.5' 0.5 7/13/2010 0.75 U 1.06 71.9 0.25 U 0.5 U 5.76 5.48 10 32 0.0835 U 0.25 U 15.6 0.75 U 0.25 U 0.75 U 23.1 75.7 -- --On-site TP-11-3' 3 7/13/2010 0.75 U 1.42 109 0.25 U 0.5 U 6.46 6.19 8 9.43 0.0835 U 0.25 U 6.77 0.75 U 0.25 U 0.75 U 25.7 141 -- --On-site TP-11-6' 6 7/13/2010 0.75 U 1.49 98.1 0.25 U 0.5 U 7.12 5.63 6.73 4.47 0.0835 U 0.25 U 4.84 0.75 U 0.25 U 0.75 U 35.1 99.5 -- --On-site TP-11-9' 9 7/13/2010 0.75 U 1.16 59 0.25 U 0.5 U 4.32 4.16 4.5 3.2 0.0835 U 0.25 U 3.21 0.75 U 0.25 U 0.75 U 22.8 39.4 -- --

LIW Property SB-35-0' 0 11/9/2009 0.75 U 3.27 104 0.25 U 0.5 U 7.82 5.65 17.9 129 0.0835 U 0.25 U 12.5 0.75 U 0.25 U 0.75 U 24.7 148 2 --LIW Property SB-35-3' 3 11/9/2009 0.75 U 3 97.9 0.25 U 0.5 U 7.67 6.74 7.61 3.39 0.0835 U 0.25 U 5.66 0.75 U 0.25 U 0.75 U 31.9 40.7 0.5 U --




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LIW Property SB-35-6' 6 11/9/2009 0.75 U 3.93 77.9 0.25 U 0.5 U 7.14 6.4 7.08 2.5 0.0835 U 0.25 U 8.13 0.75 U 0.25 U 0.75 U 34 28.1 0.5 U --LIW Property SB-35-9' 9 11/9/2009 0.75 U 4.86 84.6 0.25 U 0.5 U 13.2 7.44 10.7 3.31 0.0835 U 0.375 10.5 0.75 U 0.25 U 0.75 U 33.4 29.4 0.5 U --LIW Property SB-36-0' 0 11/9/2009 0.75 U 3.76 80.8 0.25 U 0.5 U 33.8 7.67 114 45.3 0.0835 U 7.84 603 0.75 U 0.25 U 0.75 U 20.9 90 0.5 U --LIW Property SB-36-3' 3 11/9/2009 0.75 U 4.36 106 0.288 0.5 U 31.1 8.34 12.2 9.31 0.0835 U 4.28 19 0.75 U 0.25 U 0.75 U 35.2 55.5 0.5 U --LIW Property SB-36-6' 6 11/9/2009 0.75 U 3.21 108 0.25 U 0.5 U 8.8 7.71 7.59 3.24 0.0835 U 0.25 U 7.47 0.75 U 0.25 U 0.75 U 37.3 31.6 0.5 U --LIW Property SB-36-9' 9 11/9/2009 0.75 U 4.34 108 0.302 0.5 U 15.8 9.42 12.2 3.46 0.0835 U 0.336 9.94 0.75 U 0.25 U 0.75 U 47.4 38.6 0.5 U --LIW Property SB-37-0' 0 11/9/2009 0.75 U 1.43 24.8 0.25 U 0.5 U 10.9 2.55 16.2 7.66 0.0835 U 2.19 559 0.75 U 0.25 U 0.75 U 8.5 16 0.5 U --LIW Property SB-37-3' 3 11/9/2009 0.75 U 3.14 147 0.273 0.5 U 8.74 8.23 11.2 12.6 0.0835 U 0.25 U 54.9 0.75 U 0.25 U 0.75 U 34.5 74.6 0.91 --LIW Property SB-37-6' 6 11/9/2009 0.75 U 4.47 150 0.296 0.5 U 10 9.06 9.45 4.04 0.0835 U 0.25 U 15.6 0.75 U 0.25 U 0.75 U 46 41.9 0.5 U --LIW Property SB-37-9' 9 11/9/2009 0.75 U 4.17 59.5 0.25 U 0.5 U 11.8 6.11 8.86 2.77 0.0835 U 0.25 U 9.33 0.75 U 0.25 U 0.75 U 32.9 24.9 0.5 U --LIW Property SB-38-0' 0 11/9/2009 0.75 U 6.35 42.1 0.25 U 0.5 U 12.6 3.45 34.4 53.2 0.0835 U 22.2 32 0.75 U 0.25 U 0.75 U 9.78 70.9 0.5 U --LIW Property SB-38-3' 3 11/9/2009 0.75 U 3.71 120 0.278 0.5 U 8.34 7.74 9.43 6.66 0.0835 U 0.25 U 12 0.75 U 0.25 U 0.75 U 33.9 42.6 0.51 --LIW Property SB-38-6' 6 11/9/2009 0.75 U 4.42 152 0.312 0.5 U 11.1 10 9.62 3.82 0.0835 U 0.25 U 7.6 0.75 U 0.25 U 0.75 U 53.1 39.8 0.5 U --LIW Property SB-38-9' 9 11/9/2009 0.75 U 2.94 87.6 0.25 U 0.5 U 7.12 6.43 7.56 2.65 0.0835 U 0.25 U 5.89 0.75 U 0.25 U 0.75 U 32.7 33 0.5 U --LIW Property SB-39-0' 0 11/9/2009 0.75 U 3.14 63.5 0.25 U 0.5 U 30.2 4.71 28.1 25.9 0.0835 U 6.64 291 0.75 U 0.25 U 0.75 U 17.6 56.4 0.5 U --LIW Property SB-39-3' 3 11/9/2009 0.75 U 2.95 90 0.25 U 0.5 U 8.81 6.46 7.81 3.34 0.0835 U 0.25 U 24.7 0.75 U 0.25 U 0.75 U 29.8 28 0.5 U --LIW Property SB-39-6' 6 11/9/2009 0.75 U 3.79 80.7 0.25 U 0.5 U 7.75 7.62 6.32 2.74 0.0835 U 0.25 U 5.45 0.75 U 0.25 U 0.75 U 36.5 26.3 0.5 U --LIW Property SB-39-9' 9 11/9/2009 0.75 U 3.01 69.4 0.25 U 0.5 U 4.51 4.1 6.24 1.87 0.0835 U 0.332 3.67 0.75 U 0.25 U 0.75 U 19.1 37.9 0.5 U --LIW Property SB-39-9' (DUP-6) 9 11/9/2009 0.75 U 2.11 40.5 0.25 U 0.5 U 6.08 4.91 4.52 1.7 0.0835 U 0.309 3.89 0.75 U 0.25 U 0.75 U 22.1 19.1 0.5 U --LIW Property SB-40-0' 0 11/10/2009 0.75 U 3.93 106 0.25 U 0.5 U 15.8 6.2 49.9 70.9 0.0835 U 0.89 13.4 0.75 U 0.25 U 0.75 U 21.6 85.4 0.5 U --LIW Property SB-40-3' 3 11/10/2009 0.75 U 2.74 88.5 0.25 U 0.5 U 7.64 6.83 9.74 250 0.0835 U 0.938 6.47 0.75 U 0.25 U 0.75 U 27.4 95.5 0.5 U --LIW Property SB-40-6' 6 11/10/2009 0.75 U 2.53 94 0.25 U 0.5 U 6.77 6.85 6.17 3.44 0.0835 U 0.25 U 4.69 0.75 U 0.25 U 0.75 U 29.9 26.3 0.5 U --LIW Property SB-40-9' 9 11/10/2009 0.75 U 2.41 65.4 0.25 U 0.5 U 6.55 5.63 5.39 2.16 0.0835 U 0.25 U 4.14 0.75 U 0.25 U 0.75 U 26.2 23.5 0.5 U --LIW Property SB-41-0' 0 11/10/2009 0.75 U 1.87 95.2 0.25 U 0.5 U 6.95 3.52 20.2 17.7 0.0835 U 0.301 21.5 0.75 U 0.25 U 0.75 U 13.4 33.8 0.5 U --LIW Property SB-41-3' 3 11/10/2009 0.75 U 4.31 112 0.258 0.5 U 8.76 8.11 7.99 3.72 0.0835 U 0.25 U 7.08 0.75 U 0.25 U 0.75 U 37 34 0.5 U --LIW Property SB-41-6' 6 11/10/2009 0.75 U 3.37 146 0.267 0.5 U 8.1 8.36 7.78 3.62 0.0835 U 0.25 U 6.13 0.75 U 0.25 U 0.75 U 38.1 34.7 0.5 U --LIW Property SB-41-9' 9 11/10/2009 0.75 U 2.84 38.6 0.25 U 0.5 U 7.5 3.94 6.05 1.91 0.0835 U 0.25 U 6.57 0.75 U 0.25 U 0.75 U 23.2 17.2 0.5 U --LIW Property SB-42-0' 0 11/10/2009 0.75 U 1.99 61 0.25 U 0.5 U 5.51 4.3 11.6 16.3 0.0835 U 0.25 U 5.56 0.75 U 0.25 U 0.75 U 16.5 30.2 0.5 U --LIW Property SB-42-3' 3 11/10/2009 0.75 U 2.7 100 0.25 U 0.5 U 6.64 6.73 6.78 3.43 0.0835 U 0.25 U 4.8 0.75 U 0.25 U 0.75 U 29.3 28.2 0.5 U --LIW Property SB-42-6' 6 11/10/2009 0.75 U 5.75 156 0.25 U 0.5 U 7.71 11.1 8.04 3.94 0.0835 U 0.25 U 6.26 0.75 U 0.25 U 0.75 U 49.6 40.6 0.5 U --LIW Property SB-42-9' 9 11/10/2009 0.75 U 3.12 48.8 0.25 U 0.5 U 8.38 5.53 8 2.42 0.0835 U 0.25 U 6.57 0.75 U 0.25 U 0.75 U 25.5 20.7 0.5 U --LIW Property SB-43-0' 0 11/10/2009 0.75 U 2.35 123 0.25 U 0.5 U 6.67 4.55 14.4 99.8 0.0835 U 0.25 U 10.1 0.75 U 0.25 U 0.75 U 18.8 130 0.68 --LIW Property SB-43-3' 3 11/10/2009 0.75 U 2.45 88.8 0.25 U 0.5 U 7.16 6.71 6.97 3.77 0.0835 U 0.25 U 5.01 0.75 U 0.25 U 0.75 U 28.6 37.2 0.5 U --LIW Property SB-43-6' 6 11/10/2009 0.75 U 2.4 67.9 0.25 U 0.5 U 5.52 5.91 5.12 2.06 0.0835 U 0.25 U 7.56 0.75 U 0.25 U 0.75 U 26.3 39.7 0.5 U --LIW Property SB-43-9' 9 11/10/2009 0.75 U 4.26 77.4 0.25 U 0.5 U 8.67 6.22 7.79 2.71 0.0835 U 0.25 U 7.18 0.75 U 0.25 U 0.75 U 30.9 23.9 0.5 U --LIW Property SB-44-0' 0 11/10/2009 0.75 U 3.87 74.1 0.25 U 0.5 U 39.1 10.7 106 36 0.0835 U 9.7 4330 0.75 U 0.25 U 0.75 U 19.1 89.5 0.5 U --LIW Property SB-44-3' 3 11/10/2009 0.75 U 3.84 84.3 0.25 U 0.5 U 14.5 9.58 35.7 15.3 0.0835 U 3.57 115 0.75 U 0.25 U 0.75 U 35.2 57.7 0.5 U --LIW Property SB-44-6' 6 11/10/2009 0.75 U 4.26 138 0.36 0.5 U 10.9 11.4 11.4 7.01 0.0835 U 0.25 U 14.6 0.75 U 0.25 U 0.75 U 47.2 69.7 0.5 U --LIW Property SB-44-9' 9 11/10/2009 0.75 U 1.98 52.8 0.25 U 0.5 U 6.34 5.33 5.11 1.88 0.0835 U 0.25 U 4.17 0.75 U 0.25 U 0.75 U 23.9 22.2 0.5 U --LIW Property SB-45-0' 0 11/10/2009 0.75 U 1.44 40.4 0.25 U 0.5 U 4.61 2.69 9.93 13.8 0.0835 U 0.413 81.6 0.75 U 0.25 U 0.75 U 9.86 23.5 0.5 U --LIW Property SB-45-3' 3 11/10/2009 0.75 U 3.11 136 0.275 0.5 U 8.42 8.31 8.62 5.94 0.0835 U 0.25 U 10.8 0.75 U 0.25 U 0.75 U 36.8 36.9 0.5 U --LIW Property SB-45-6' 6 11/10/2009 0.75 U 1.97 77.2 0.25 U 0.5 U 4.61 4.9 4.55 1.68 0.0835 U 0.25 U 3.36 0.75 U 0.25 U 0.75 U 21.3 20.7 0.5 U --LIW Property SB-45-9' 9 11/10/2009 0.75 U 2.33 56.5 0.25 U 0.5 U 7.43 4.18 5.98 2.08 0.0835 U 0.25 U 5.8 0.75 U 0.25 U 0.75 U 19.5 18.5 0.5 U --




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LIW Property SB-46-0' 0 11/10/2009 0.75 U 10.4 81.3 0.25 U 0.5 U 58.5 4.99 62.9 52.3 0.0835 U 14.3 318 0.75 U 0.25 U 0.75 U 14.8 85.3 0.5 U --LIW Property SB-46-3' 3 11/10/2009 0.75 U 2.33 101 0.25 0.5 U 7.12 6.92 6.87 3.92 0.0835 U 0.25 U 5.14 0.75 U 0.25 U 0.75 U 31.5 29.7 0.5 U --LIW Property SB-46-6' 6 11/10/2009 0.75 U 3.59 110 0.25 U 0.5 U 9.43 8.43 8.08 3.05 0.0835 U 0.25 U 6.06 0.75 U 0.25 U 0.75 U 40.2 32.2 0.5 U --LIW Property SB-46-9' 9 11/10/2009 0.75 U 1.61 37.2 0.25 U 0.5 U 3.83 3.71 4.18 1.47 0.0835 U 0.25 U 2.63 0.75 U 0.25 U 0.75 U 16.5 16.6 0.5 U --Off-site ROW SB-3-0' 0 10/14/2008 0.75 U 0.75 U 23 0.25 U 0.5 U 2.66 2.13 5.47 1.96 0.127 0.25 U 2.99 0.75 U 0.25 U 0.75 U 12.6 112 0.5 U --Off-site ROW SB-3-3' 3 10/14/2008 0.75 U 1.48 97 0.25 U 0.5 U 6.32 4.86 12.9 53.1 0.111 0.25 U 7.37 0.75 U 0.25 U 0.75 U 22.1 63.9 0.5 U --Off-site ROW SB-3-6' 6 10/14/2008 0.75 U 1.27 71 0.25 U 0.5 U 5.52 4.84 9.34 22.1 0.0835 U 0.25 U 5.66 0.75 U 0.25 U 0.75 U 21.2 44.9 0.5 U --Off-site ROW SB-3-9' 9 10/14/2008 0.75 U 0.75 U 30.9 0.25 U 0.5 U 3.6 3.72 5.63 2 0.0835 U 0.25 U 3.48 0.75 U 0.25 U 0.75 U 14.7 109 0.5 U --Off-site ROW SB-3-9' (DUP-3) 9 10/14/2008 0.75 U 2.08 82.7 0.25 U 0.5 U 7.07 4.91 10.5 13.4 0.0835 U 0.25 U 6.05 0.75 U 0.25 U 0.75 U 25.9 34.8 0.5 U --Off-site ROW SB-4-0' 0 10/14/2008 0.75 U 1.17 63.3 0.25 U 0.5 U 5.97 4.44 7.39 14.9 0.0835 U 0.25 U 4.9 0.75 U 0.25 U 0.75 U 19.5 34.9 2.5 --Off-site ROW SB-4-3' 3 10/14/2008 0.75 U 1.29 83.7 0.251 0.5 U 9.6 5.02 11.7 64.9 0.0835 U 0.25 U 15 0.75 U 0.25 U 0.75 U 22.8 66.1 0.94 --Off-site ROW SB-4-6' 6 10/14/2008 0.75 U 1.23 81.6 0.274 0.5 U 6.85 6.68 9.86 24.8 0.0835 U 0.25 U 11.1 0.75 U 0.25 U 0.75 U 24.4 56.3 0.5 U --Off-site ROW SB-4-7' 7 10/14/2008 0.75 U 2.19 119 0.282 0.5 U 6.64 4.12 40.5 783 0.0835 U 0.25 U 14 0.75 U 0.25 U 0.75 U 35.9 56.8 0.5 U --Off-site ROW SB-4-9' 9 10/14/2008 0.75 U 0.75 U 40 0.25 U 0.5 U 4.29 6.96 3.79 1.8 0.0835 U 0.33 4.02 0.75 U 0.25 U 0.75 U 17.9 26.6 0.5 U --Off-site ROW SB-11-0' 0 10/14/2008 0.75 U 1.29 109 0.271 0.5 U 11.7 4.29 11.2 101 0.0835 U 0.25 U 8.15 0.75 U 0.25 U 0.75 U 24 56.2 4.1 --Off-site ROW SB-11-3' 3 10/14/2008 0.75 U 1.9 101 0.409 0.5 U 8.06 4.82 13.5 4.7 0.0835 U 0.25 U 8.15 0.75 U 0.25 U 0.75 U 63.5 39.2 0.5 U --Off-site ROW SB-11-6' 6 10/14/2008 0.75 U 2.04 94.4 0.32 0.5 U 8.42 4.82 9.92 3.62 0.0835 U 0.25 U 8.84 0.75 U 0.25 U 0.75 U 36.9 31.2 0.5 U --Off-site ROW SB-11-9' 9 10/14/2008 0.75 U 0.893 45.1 0.25 U 0.5 U 7.43 4.28 6.6 2.42 0.0835 U 0.25 U 48.9 0.75 U 0.25 U 0.75 U 20.3 23.6 0.5 U --Off-site ROW SB-12-0' 0 10/14/2008 0.75 U 1.38 110 0.265 0.5 U 8.54 5.29 13.9 99.2 0.0835 U 0.25 U 8.71 0.75 U 0.25 U 0.75 U 22.8 83.5 0.84 --Off-site ROW SB-12-1.5' 1.5 10/14/2008 0.75 U 1.94 81.8 0.254 0.5 U 6.06 6.11 4.97 2.48 0.0835 U 0.25 U 5.46 0.75 U 0.25 U 0.75 U 24.8 28.1 0.5 U --Off-site ROW SB-12-3' 3 10/14/2008 2.03 2.82 123 0.306 0.5 U 6.37 4.86 25.6 383 0.0835 U 0.262 28.4 0.75 U 0.25 U 0.75 U 46.8 86.7 0.96 --Off-site ROW SB-12-6' 6 10/14/2008 0.75 U 1.75 101 0.379 0.5 U 8.43 4.77 24.1 54 0.128 0.25 U 52.4 0.75 U 0.25 U 0.75 U 47.5 82 0.5 U --Off-site ROW SB-12-9' 9 10/14/2008 0.75 U 1.5 96.7 0.291 0.5 U 8.28 5.09 9.33 7.67 0.0835 U 0.25 U 14.2 0.75 U 0.25 U 0.75 U 38.7 40.4 0.5 U --Off-site ROW SB-26-0.5' 0.5 11/5/2009 0.75 U 1.41 81.9 0.25 U 0.5 U 4.73 4.4 5.84 6.03 0.0835 U 0.25 U 3.86 0.75 U 0.25 U 0.75 U 16.7 24.8 -- --Off-site ROW SB-26-5' 5 11/5/2009 0.75 U 2.32 48.9 0.25 U 0.5 U 5.78 5.01 4.61 1.81 0.0835 U 0.25 U 3.57 0.75 U 0.25 U 0.75 U 25.2 16.5 -- --Off-site ROW SB-27-0.5' 0.5 11/5/2009 0.75 U 1.92 101 0.25 U 0.5 U 5.51 6.11 7.1 52.1 0.0835 U 0.25 U 10.6 0.75 U 0.25 U 0.75 U 20.4 47 -- --Off-site ROW SB-27-5' 5 11/5/2009 0.75 U 1.42 36.9 0.25 U 0.5 U 5.24 4.09 3.91 3.41 0.0835 U 0.25 U 3.3 0.75 U 0.25 U 0.75 U 21.4 17.6 -- --Off-site ROW SB-27-10' (DUP-5) 10 11/5/2009 0.75 U 1.42 36.7 0.25 U 0.5 U 3.28 3.71 3.75 1.25 0.0835 U 0.25 U 2.51 0.75 U 0.25 U 0.75 U 16.5 15.5 -- --Off-site ROW SB-28-0.5' 0.5 11/5/2009 0.75 U 1.39 95.5 0.25 U 0.5 U 6.65 4.93 8.99 52.1 0.0835 U 0.25 U 6.43 0.75 U 0.25 U 0.75 U 21.7 50.2 -- --Off-site ROW SB-28-8' 8 11/5/2009 0.75 U 2.82 54.1 0.25 U 0.5 U 10.2 5.16 5.14 3.97 0.0835 U 0.785 4.82 0.75 U 0.25 U 0.75 U 26.7 19.8 -- --Off-site ROW SB-29-0.5' 0.5 11/4/2009 0.75 U 2.07 102 0.25 U 0.5 U 6.97 5.44 8.48 29.5 0.0835 U 0.25 U 7.81 0.75 U 0.25 U 0.75 U 23.8 51.4 -- --Off-site ROW SB-29-5' 5 11/4/2009 0.75 U 2.42 63.1 0.25 U 0.5 U 6.5 4.73 4.92 1.93 0.0835 U 0.25 U 4.08 0.75 U 0.25 U 0.75 U 32 22.3 -- --Off-site ROW SB-29-10' 10 11/4/2009 0.75 U 1.72 65.9 0.25 U 0.5 U 13.3 8.12 8.43 2.61 0.0835 U 0.25 U 11 0.75 U 0.25 U 0.75 U 30.1 25.8 -- --Off-site ROW SB-30-0.5' 0.5 11/4/2009 0.75 U 1.78 133 0.25 U 0.5 U 8.35 6.19 12 57.2 0.0835 U 0.25 U 7.61 0.75 U 0.25 U 0.75 U 28.9 97 -- --Off-site ROW SB-30-5' 5 11/4/2009 0.75 U 3.06 92.1 0.25 U 0.5 U 9.16 7.23 7.49 2.67 0.0835 U 0.25 U 6.11 0.75 U 0.25 U 0.75 U 37.3 29.5 -- --Off-site ROW SB-30-5' (DUP-3) 5 11/4/2009 0.75 U 2.36 88.3 0.25 U 0.5 U 8.4 7.15 7.25 2.62 0.0835 U 0.25 U 5.67 0.75 U 0.25 U 0.75 U 37.6 28.9 -- --Off-site ROW SB-30-10' 10 11/4/2009 0.75 U 3.83 73.9 0.274 0.5 U 20.8 8.42 12.1 3.48 0.0835 U 0.555 12.4 0.75 U 0.25 U 0.75 U 40.7 33.1 -- --Off-site ROW SB-31-0.5' 0.5 11/4/2009 0.75 U 1.89 114 0.25 U 0.5 U 6.88 5.87 7.14 7.18 0.0835 U 0.25 U 5.34 0.75 U 0.25 U 0.75 U 25.8 32.9 -- --Off-site ROW SB-31-5' 5 11/4/2009 0.75 U 2.64 75.6 0.25 U 0.5 U 6.74 6.36 5.57 1.68 0.0835 U 0.25 U 4.21 0.75 U 0.25 U 0.75 U 31.1 22.6 -- --Off-site ROW SB-31-10' 10 11/4/2009 0.75 U 3.13 92.4 0.264 0.5 U 14.3 7.48 10.5 3.73 0.0835 U 0.25 U 11 0.75 U 0.25 U 0.75 U 40 31.7 -- --Off-site ROW SB-32-0.5' 0.5 11/4/2009 0.75 U 1.44 102 0.25 U 0.5 U 6.06 5.58 6.27 5.31 0.0835 U 0.25 U 4.7 0.75 U 0.25 U 0.75 U 21.6 35.9 -- --Off-site ROW SB-32-5' 5 11/4/2009 0.75 U 3.28 97.1 0.25 U 0.5 U 9.04 7.22 7.21 4.6 0.0835 U 0.25 U 6.03 0.75 U 0.25 U 0.75 U 36.2 31 -- --Off-site ROW SB-32-10' 10 11/4/2009 0.75 U 6.6 142 0.455 0.5 U 18.9 11.6 12.9 5.27 0.0835 U 0.25 U 15.7 0.75 U 0.25 U 0.75 U 52.4 42.2 -- --




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Off-site ROW SB-33-0.5' 0.5 11/4/2009 0.75 U 3.72 136 0.25 U 0.5 U 15.8 5.29 20.2 80.7 0.0835 U 0.315 23.3 0.75 U 0.25 U 0.75 U 44.4 70.9 -- --Off-site ROW SB-33-5' 5 11/4/2009 0.75 U 3.35 104 0.25 U 0.5 U 7.76 7.1 6.72 2.39 0.0835 U 0.25 U 7.18 0.75 U 0.25 U 0.75 U 38.6 38.5 -- --Off-site ROW SB-33-10' 10 11/4/2009 0.75 U 12 207 0.709 0.5 U 17.4 17.5 11.2 6.7 0.0835 U 0.25 U 30.2 0.75 U 0.25 U 0.75 U 62.2 99.2 -- --Off-site ROW SB-47-0.5' 0.5 7/15/2010 18.6 6.93 415 0.25 U 0.5 U 11.3 4.75 16.4 222 0.0835 U 0.25 U 9.56 0.75 U 0.25 U 0.75 U 44.9 86.5 -- --Off-site ROW SB-47-3' 3 7/15/2010 0.945 1.03 94.9 0.25 U 0.5 U 7.46 5.03 9.12 5.93 0.0835 U 0.25 U 4.86 0.75 U 0.25 U 0.75 U 26.5 33.2 -- --Off-site ROW SB-47-6' 6 7/15/2010 0.75 U 1.59 61.9 0.25 U 0.5 U 5.96 5.88 5.12 2.42 0.0835 U 0.25 U 4.94 0.75 U 0.25 U 0.75 U 26.9 34.6 -- --

Notes:Samples SHADED GRAY are included in the exposed soils (0-0.5 feet bgs) dataset.All analytical results are presented in milligrams per kilogram (mg/kg).-- = not analyzed for. bgs = below ground surfaceDUP = field duplicate sampleLIW = Lodi Iron WorksROW = right-of-wayJ = Estimated value.U = Indicates constituent not detected at concentration equal to or greater than the specified reporting limit.



POLYCYCLIC AROMATIC HYDROCARBONSFormer Lodi Manufactured Gas Plant

Lodi, California

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On-site AK-1-30" 2.5 7/15/2010 0.02 U 0.02 U 0.02 U 0.04 0.02 U 0.078 0.2 0.19 0.57 0.18 0.15 0.036 0.28 0.02 U 0.36 0.02 U 0.081 0.32 0.29On-site AK-1-38" 3.17 7/15/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.024 0.068 0.072 0.23 0.068 0.047 0.02 U 0.078 0.02 U 0.13 0.02 U 0.026 0.096 0.10On-site AK-2-20" 1.7 7/15/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.027 0.025 0.06 0.02 U 0.02 0.02 U 0.033 0.02 U 0.034 0.02 U 0.02 U 0.048 0.039On-site AK-2-34" 2.83 7/15/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site AK-3-17" 1.42 7/15/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-1-0' 0 10/15/2008 -- -- 0.019 0.13 0.027 0.16 0.33 0.29 0.33 0.13 0.22 0.027 0.66 0.01 U 0.39 0.041 0.3 0.8 0.44On-site SB-1-3' 3 10/15/2008 -- -- 0.088 0.03 U 0.032 0.01 U 0.014 0.014 0.013 0.01 U 0.01 U 0.01 U 0.02 0.01 U 0.021 0.015 U 0.01 U 0.021 0.020On-site SB-1-6' 6 10/15/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.012 0.01 U 0.01 U 0.01 U 0.017 0.01 U 0.01 0.015 U 0.012 0.019 0.0093On-site SB-1-9' 9 10/15/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088On-site SB-2-0' 0 10/15/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 0.0088On-site SB-2-0' (DUP-6) 0 10/15/2008 -- -- 0.015 U 0.03 U 0.01 U 0.013 0.03 0.026 0.039 0.01 U 0.016 0.01 U 0.07 0.01 U 0.036 0.015 U 0.053 0.082 0.040On-site SB-2-3' 3 10/15/2008 -- -- 0.015 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.016 0.01 U 0.01 U 0.0088On-site SB-2-6' 6 10/15/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088On-site SB-2-9' 9 10/15/2008 -- -- 0.015 U 0.03 U 0.01 U 0.019 0.076 0.055 0.091 0.022 0.023 0.01 U 0.058 0.01 U 0.088 0.015 U 0.01 U 0.068 0.096On-site SB-5-0' 0 10/15/2008 -- -- 1.5 U 3 U 1.7 12 20 29 37 8.7 22 1 U 71 1 U 38 1.4 41 62 29On-site SB-5-6' 6 10/15/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.011 0.01 U 0.01 U 0.01 U 0.028 0.01 U 0.01 0.02 0.033 0.033 0.0093On-site SB-5-9' 9 10/15/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.016 0.01 U 0.01 U 0.042 0.021 0.02 0.0088On-site SB-6-7.5' 7.5 10/14/2008 -- -- 1.5 U 3 U 1 U 2.1 5.6 4.4 6.6 1.6 3.7 1 U 14 1 U 6 12 13 16 7.2On-site SB-6-9.5' 9.5 10/14/2008 -- -- 30 U 60 U 20 U 20 U 42 27 37 20 U 30 20 U 120 20 U 34 790 170 140 54On-site SB-7-0' 0 10/15/2008 -- -- 7.5 U 20 13 39 69 68 80 30 54 12 280 10 84 180 220 300 96On-site SB-7-3' 3 10/15/2008 -- -- 0.075 U 0.15 U 0.05 U 0.2 0.44 0.41 0.68 0.17 0.27 0.05 U 1.2 0.05 U 0.58 0.42 0.91 1.5 0.59On-site SB-7-6' 6 10/15/2008 -- -- 3 U 6 U 3.3 12 24 24 38 9.4 17 4.2 81 2.5 31 27 70 97 33On-site SB-7-6' (DUP-4) 6 10/15/2008 -- -- 0.15 U 0.3 U 0.15 0.53 1.1 1.1 1.4 0.44 0.7 0.1 U 3.1 0.1 U 1.5 1.4 2.7 3.8 1.5On-site SB-7-9' 9 10/15/2008 -- -- 0.016 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.048 0.01 U 0.014 0.0088On-site SB-8-0' 0 10/15/2008 -- -- 0.075 U 2.1 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.05 U 0.089 0.05 U 0.05 U 0.075 U 0.05 U 0.099 0.044On-site SB-8-3' 3 10/15/2008 -- -- 0.015 U 0.061 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088On-site SB-8-5.5' 5.5 10/15/2008 -- -- 9.6 7.5 U 7 17 41 35 57 14 23 2.5 U 100 4.5 50 67 89 130 53On-site SB-8-6' 6 10/15/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.033 0.012 0.29 0.01 U 0.01 U 0.01 U 0.024 0.01 U 0.01 U 0.015 U 0.023 0.034 0.037On-site SB-8-9' 9 10/15/2008 -- -- 0.037 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.09 0.01 U 0.01 U 0.015 U 0.012 0.14 0.0088On-site SB-9-0' 0 10/13/2008 -- -- 0.3 U 0.6 U 0.26 1.5 3.6 3.3 5 1.4 2 0.3 7.5 0.2 U 4.7 0.52 4.5 9.3 4.8On-site SB-9-3' 3 10/13/2008 -- -- 0.015 U 0.03 U 0.01 U 0.03 0.1 0.093 0.16 0.034 0.037 0.022 0.11 0.01 0.15 0.027 0.022 0.14 0.14On-site SB-9-3' (DUP-1) 3 10/13/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.03 0.03 0.06 0.01 U 0.013 0.01 U 0.028 0.01 U 0.046 0.015 U 0.01 U 0.048 0.040On-site SB-9-6' 6 10/13/2008 -- -- 0.075 U 0.15 U 0.05 U 0.28 0.89 0.8 1.5 0.28 0.31 0.05 U 1.1 0.05 U 1.2 0.2 0.55 1.5 1.2On-site SB-9-9' 9 10/13/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.011 0.01 0.017 0.01 U 0.01 U 0.01 U 0.023 0.01 U 0.016 0.041 0.015 0.023 0.016On-site SB-9-9' (DUP-2) 9 10/13/2008 -- -- 0.015 U 0.033 0.011 0.065 0.16 0.15 0.29 0.061 0.12 0.01 U 0.47 0.011 0.24 0.21 0.26 0.53 0.21On-site SB-10-1.5' 1.5 10/15/2008 -- -- 0.75 U 1.5 U 0.5 U 1.3 2.4 2.4 3.5 0.83 1.6 0.5 U 8.1 0.5 U 3.1 2.7 7.1 10 3.26On-site SB-10-3' 3 10/15/2008 -- -- 0.015 U 0.052 0.01 U 0.072 0.37 0.3 0.47 0.1 0.095 0.01 U 0.25 0.01 U 0.44 0.015 U 0.031 0.4 0.46On-site SB-10-3' (DUP-5) 3 10/15/2008 -- -- 0.036 0.039 0.01 U 0.098 0.41 0.32 0.56 0.12 0.014 0.058 0.31 0.01 U 0.49 0.031 0.05 0.46 0.53On-site SB-10-6' 6 10/15/2008 -- -- 0.029 0.03 U 0.01 U 0.097 0.32 0.25 0.42 0.09 0.11 0.04 0.32 0.01 U 0.38 0.018 0.061 0.47 0.42On-site SB-10-9' 9 10/15/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.043 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.22 0.01 U 0.01 U 0.0088On-site SB-13-0' 0 10/13/2008 -- -- 7.5 U 15 U 11 44 68 70 78 33 53 5.4 190 6.4 87 19 120 220 94On-site SB-13-3' 3 10/13/2008 -- -- 3 U 6 U 3.3 13 20 21 21 9.5 16 4.4 66 2 U 24 3.4 44 72 28On-site SB-13-6' 6 10/13/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088




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On-site SB-13-9' 9 10/13/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088On-site SB-14-0' 0 10/13/2008 -- -- 0.084 0.2 0.13 0.69 1.6 1.6 2.7 0.57 1 0.14 3.9 0.096 2.5 0.68 2.5 4.6 2.2On-site SB-14-2' 2 10/13/2008 -- -- 12 60 22 38 66 54 63 23 46 5 U 200 20 59 510 250 240 85On-site SB-14-3' 3 10/13/2008 -- -- 7.5 U 50 19 32 55 45 49 20 41 5 U 180 16 51 460 210 200 71On-site SB-14-6' 6 10/13/2008 -- -- 7.5 U 15 U 5.4 8.3 15 12 15 5 U 9.8 5 U 45 5 U 14 170 57 51 20On-site SB-14-9' 9 10/13/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088On-site SB-15-0' 0 10/13/2008 -- -- 1.6 3 U 2.4 6.1 11 10 13 4.6 7.9 1 U 39 1.1 13 4.1 28 39 15On-site SB-15-3' 3 10/13/2008 -- -- 0.75 U 1.5 U 0.52 3.8 7.2 7.6 11 3.3 5.3 0.75 18 0.5 U 11 3 12 21 10On-site SB-15-6' 6 10/13/2008 -- -- 0.75 U 1.5 U 0.5 U 0.93 1.8 1.9 3.1 0.67 1.3 0.5 U 4.9 0.5 U 2.5 0.75 U 3.6 5.9 2.5On-site SB-15-9' 9 10/13/2008 -- -- 0.03 U 0.079 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.03 U 0.02 U 0.02 U 0.018On-site SB-16-1' 1 10/13/2008 -- -- 0.75 U 1.5 U 1.2 5.7 12 12 17 4.8 8.1 0.84 36 0.5 U 16 1.6 22 40 16On-site SB-16-3' 3 10/13/2008 -- -- 0.34 0.06 U 0.2 U 0.034 0.068 0.074 0.12 0.026 0.049 0.035 0.18 0.2 U 0.051 0.15 0.11 0.2 0.099On-site SB-16-6' 6 10/13/2008 -- -- 0.03 U 0.06 U 0.2 U 0.047 0.078 0.1 0.21 0.031 0.085 0.34 0.23 0.027 0.028 0.3 U 0.082 0.23 0.22On-site SB-16-9' 9 10/13/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088On-site SB-17-1' 1 11/5/2009 0.35 0.47 0.2 U 0.78 0.38 1.3 3 2.9 5.5 1.8 2 0.41 5.2 0.2 U 4 0.79 3.3 5.8 4.2On-site SB-18-0' 0 11/4/2009 5 U 5 U 5 U 7.7 5 U 23 33 57 140 37 38 5.1 100 5 U 100 11 66 130 57On-site SB-18-8' 8 11/4/2009 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.17 0.1 U 0.1 U 0.1 U 0.31 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.21 0.21On-site SB-19-5' 5 11/5/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-20-0' 0 11/4/2009 0.4 U 0.4 U 0.4 U 0.67 0.4 U 1.6 3.7 3.3 9.2 2.3 2.2 0.62 4.5 0.4 U 6 0.62 2.1 6.5 5.3On-site SB-21-0' 0 11/3/2009 0.04 U 0.04 U 0.04 U 0.04 U 0.04 U 0.16 0.3 0.3 0.52 0.19 0.23 0.04 U 0.58 0.04 U 0.35 0.054 0.39 0.57 0.41On-site SB-21-5' 5 11/2/2009 0.1 U 0.1 U 0.1 U 0.2 0.11 0.7 1 0.87 1.6 0.79 0.78 0.16 2.3 0.1 U 1.2 0.29 1.7 2.4 1.4On-site SB-21-10' 10 11/2/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-22-0' 0 11/2/2009 2 U 2 U 2 U 9.4 3.2 9.5 14 11 19 8.9 11 2 U 44 3.7 14 16 47 52 19On-site SB-22-5' 5 11/2/2009 0.2 U 0.2 U 0.2 U 0.47 0.22 1.2 1.9 1.6 3.6 1.2 1.3 0.2 U 3.7 0.2 U 2.6 0.46 3.1 4.9 2.6On-site SB-22-10' 10 11/2/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-23-0' 0 11/2/2009 2 U 2 U 2 U 2.7 2 U 9 17 22 46 13 13 2.4 34 2 U 35 3.4 14 40 26On-site SB-23-10' 10 11/2/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-24-0' 0 11/2/2009 0.1 U 0.1 U 0.1 U 0.11 0.1 U 0.21 0.38 0.32 0.74 0.27 0.26 0.1 U 0.75 0.1 U 0.54 0.1 0.55 0.88 0.53On-site SB-24-5' 5 11/2/2009 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.19 0.46 0.41 1.3 0.29 0.23 0.1 U 0.63 0.1 U 0.93 0.1 U 0.39 0.83 0.66On-site SB-24-10' 10 11/2/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-25-0' 0 11/2/2009 5 U 5 U 5 U 9.8 7.3 27 46 39 74 30 35 5 U 120 5 U 56 24 99 150 62On-site SB-25-5' 5 11/2/2009 0.02 U 0.02 U 0.02 U 0.024 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-25-10' 10 11/2/2009 0.02 U 0.02 U 0.02 U 0.051 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-34-0' 0 11/3/2009 2 U 2 U 2 U 2 U 2 U 8.4 14 11 21 9 9.8 2 U 25 2 U 17 3.6 16 34 19On-site SB-34-8' 8 11/3/2009 0.1 U 0.1 U 0.1 U 0.12 0.1 U 0.1 U 0.1 U 0.1 U 0.31 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.088On-site SB-48-1.5' 1.5 7/13/2010 4 U 4 U 4 U 11 12 25 72 42 83 35 36 8.2 96 4 U 57 9.6 71 120 91On-site SB-48-3' 3 7/13/2010 0.5 U 0.5 U 0.5 U 0.95 1.2 2.2 6 3.4 7.2 3.1 3 0.71 9.9 0.5 U 4.9 1.2 7.2 12 7.6On-site SB-48-6' 6 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-49-3' 3 7/13/2010 1 U 1 U 1 U 2.7 1.3 3.5 14 7.8 22 6.5 5.4 1.7 10 1 U 13 4.9 6.5 13 18On-site SB-49-4' 4 7/13/2010 1000 U 1000 1000 U 4100 2400 2000 3900 2200 3400 2200 2800 1000 U 9800 1400 2600 23000 13000 10000 4998On-site SB-49-6' 6 7/13/2010 0.02 U 0.02 U 0.02 U 0.13 0.079 0.1 0.21 0.12 0.16 0.1 0.15 0.021 0.49 0.042 0.12 0.17 0.65 0.54 0.26On-site SB-50-1.5' 1.5 7/13/2010 4 U 4 U 4 U 4 U 4 U 13 34 20 54 20 19 4 U 56 4 U 35 4 U 25 61 44On-site SB-50-3' 3 7/13/2010 0.02 U 0.02 U 0.02 U 0.033 0.02 U 0.034 0.076 0.047 0.12 0.046 0.046 0.02 U 0.13 0.02 U 0.077 0.02 U 0.049 0.17 0.10




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On-site SB-50-6' 6 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-51-1.5' 1.5 7/13/2010 0.2 U 0.2 U 0.2 U 0.36 0.2 U 0.78 1.8 1.2 2.6 1.1 1.1 0.21 2.7 0.2 U 1.8 0.34 2.1 2.7 2.4On-site SB-51-3' 3 7/13/2010 0.02 U 0.02 U 0.02 U 0.086 0.046 0.18 0.45 0.28 0.59 0.25 0.28 0.062 0.6 0.02 U 0.41 0.27 0.53 0.82 0.59On-site SB-51-6.5' 6.5 7/13/2010 1000 U 1000 U 1000 U 1400 1000 U 3300 7600 4600 11000 4700 4400 1000 U 20000 1000 U 7500 1000 U 9600 21000 9824On-site SB-51-9' 9 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-52-1' 1 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.043 0.14 0.086 0.24 0.07 0.057 0.02 0.13 0.02 U 0.15 0.02 U 0.041 0.19 0.18On-site SB-52-3' 3 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.023 0.052 0.037 0.1 0.031 0.03 0.02 U 0.055 0.02 U 0.063 0.02 U 0.02 U 0.082 0.071On-site SB-52-6' 6 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-52-9' 9 7/12/2010 0.03 0.062 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.04 0.02 U 0.02 U 0.018On-site SB-53-0.5' 0.5 7/12/2010 0.04 U 0.04 U 0.04 U 0.04 U 0.04 U 0.04 U 0.073 0.059 0.28 0.05 0.052 0.04 U 0.14 0.04 U 0.13 0.04 U 0.087 0.16 0.11On-site SB-53-3' 3 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-53-6' 6 7/13/2010 0.04 U 0.04 U 0.04 U 0.054 0.04 U 0.1 0.25 0.21 0.53 0.15 0.17 0.04 U 0.5 0.04 U 0.33 0.04 U 0.25 0.45 0.34On-site SB-53-9' 9 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-54-1' 1 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.038 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.023 0.02 U 0.02 U 0.02 U 0.019On-site SB-54-3' 3 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.024 0.053 0.05 0.17 0.037 0.049 0.02 U 0.1 0.02 U 0.11 0.02 U 0.058 0.1 0.079On-site SB-54-6' 6 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-54-9' 9 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-55-1.5' 1.5 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.024 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.021 0.018On-site SB-55-3' 3 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-55-6' 6 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-55-9' 9 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-56-0.5' 0.5 7/14/2010 4 U 4 U 4 U 6.2 4 U 15 26 25 43 22 26 4 U 69 4 U 32 4 U 39 63 36On-site SB-56-3' 3 7/14/2010 0.02 U 0.02 U 0.02 U 0.043 0.02 U 0.12 0.17 0.23 0.47 0.17 0.23 0.042 0.58 0.02 U 0.34 0.058 0.22 0.71 0.27On-site SB-56-6' 6 7/14/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.023 0.035 0.045 0.099 0.03 0.041 0.02 U 0.11 0.02 U 0.069 0.02 U 0.038 0.14 0.056On-site SB-56-9' 9 7/14/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.052 0.02 U 0.02 U 0.02 U 0.048 0.02 U 0.033 0.02 U 0.021 0.061 0.020On-site SB-62-0 0 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.024 0.02 U 0.018On-site SB-62-5 5 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-62-10 10 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.021 0.031 0.02 U 0.031 0.02 U 0.036 0.02 U 0.02 U 0.02 U 0.025 0.034 0.019On-site SB-63-1 1 9/23/2010 0.02 U 0.02 U 0.12 0.11 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.059 0.02 U 0.2 0.02 U 0.02 U 0.018On-site SB-63-5 5 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-63-10 10 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-64-1 1 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-64-5 5 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-64-10 10 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-65-1 1 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.022 0.027 0.031 0.029 0.02 U 0.034 0.02 U 0.047 0.02 U 0.02 U 0.02 U 0.031 0.046 0.038On-site SB-65-5 5 9/23/2010 0.02 U 0.02 U 0.039 0.036 0.02 U 0.02 U 0.024 0.031 0.036 0.024 0.035 0.02 U 0.041 0.021 0.022 0.062 0.024 0.048 0.036On-site SB-65-10 10 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.086 0.15 0.2 0.17 0.12 0.19 0.047 0.27 0.02 U 0.13 0.02 U 0.1 0.22 0.22On-site SB-66-0 0 9/23/2010 0.02 U 0.02 U 0.11 0.098 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.048 0.02 U 0.19 0.02 U 0.02 U 0.018On-site SB-66-5 5 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-66-10 10 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.028 0.037 0.041 0.036 0.02 U 0.044 0.02 U 0.048 0.02 U 0.024 0.02 U 0.027 0.045 0.051On-site SB-67-0 0 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.022 0.02 U 0.018On-site SB-67-5 5 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-67-10 10 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018




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On-site SB-68-0 0 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-68-5 5 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-68-10 10 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site SB-69-0 0 9/23/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.029 0.02 U 0.02 U 0.02 U 0.022 0.027 0.018On-site SB-69-5 5 9/23/2010 0.02 U 0.02 U 0.063 0.05 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.036 0.02 U 0.039 0.02 U 0.02 U 0.018On-site SB-69-10 10 9/23/2010 0.02 U 0.021 0.023 0.02 U 0.024 0.028 0.029 0.027 0.032 0.029 0.033 0.025 0.031 0.031 0.029 0.035 0.042 0.036 0.049On-site SS-1 0 2/24/2006 -- 1.65 U 1.65 U 1.65 U 1.65 U 0.064 0.11 0.14 0.22 0.17 0.056 1.65 U 0.17 1.65 U 0.11 1.65 U 0.1 0.23 0.44On-site SS-2 0 2/24/2006 -- 0.18 0.043 0.76 0.34 2.4 4.7 7.4 8.6 9.1 4.1 0.71 9.4 0.091 5.9 0.54 5.2 12 7.5On-site SS-3 0 2/24/2006 -- 0.24 0.34 15 6.8 83 110 180 95 220 95 13 300 1.6 64 5 140 340 170On-site SS-4 0 2/24/2006 -- 0.59 0.27 5.8 3.6 11 18 23 11 4.5 14 1.5 43 2.1 8.8 5.1 45 49 23On-site SS-5 0 2/24/2006 -- 1.65 U 1.65 U 0.16 0.088 0.37 0.75 1 0.75 1.3 0.55 0.081 1.5 1.65 U 0.49 1.65 U 0.81 1.9 1.1On-site SS-6 0 2/24/2006 -- 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.33 U 0.29On-site SS-7 0 2/24/2006 -- 0.8 0.29 11 4.7 30 60 82 48 100 43 7 120 1.9 31 15 88 150 87On-site SS-8 0 2/24/2006 -- 0.22 0.092 3.9 1.7 13 29 46 28 57 19 3.4 40 0.66 14 3.3 23 51 43On-site SS-9 0 2/24/2006 -- 0.058 0.055 1.7 0.75 4 7.5 9 7.9 2.5 4.9 0.68 18 0.2 4.4 0.96 10 23 9.8On-site TP-1-0.5' 0.5 7/12/2010 0.02 U 0.02 U 0.02 U 0.026 0.02 U 0.054 0.12 0.13 0.22 0.078 0.098 0.02 U 0.26 0.02 U 0.15 0.02 U 0.12 0.33 0.17On-site TP-1-3' 3 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 0.02 U 0.02 U 0.02 U 0.023 0.02 U 0.02 U 0.02 U 0.02 U 0.032 0.018On-site TP-1-6' 6 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site TP-2-0.5' 0.5 7/12/2010 0.2 U 0.2 U 0.2 U 0.25 0.2 U 0.38 0.95 0.86 2.2 0.61 0.69 0.2 U 1.4 0.2 U 1.3 0.2 U 0.73 1.7 1.3On-site TP-2-3' 3 7/12/2010 0.02 U 0.02 U 0.02 U 0.024 0.02 U 0.048 0.12 0.12 0.23 0.071 0.085 0.02 U 0.18 0.02 U 0.15 0.02 U 0.065 0.23 0.16On-site TP-2-6' 6 7/12/2010 1 U 1 U 1 U 1 U 1 U 2.3 5.1 4 9.9 2.7 3.7 1 U 16 1 U 5.7 1 U 7.6 20 6.8On-site TP-2-9' 9 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.048 0.02 U 0.02 U 0.02 U 0.028 0.02 U 0.029 0.02 U 0.02 U 0.035 0.019On-site TP-3-0.5' 0.5 7/12/2010 2 U 2 U 2 U 5.4 2 U 10 18 24 40 19 19 3.9 44 2 U 28 2 U 21 46 28On-site TP-3-3' 3 7/12/2010 0.1 U 0.1 U 0.1 U 0.11 0.1 U 0.33 0.55 0.76 1.3 0.57 0.64 0.12 1.3 0.1 U 0.93 0.1 U 0.49 1.4 0.86On-site TP-3-6' 6 7/12/2010 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.37 0.58 0.72 1.3 0.62 0.64 0.13 1.4 0.1 U 0.9 0.1 U 0.69 1.5 0.89On-site TP-4-0.5' 0.5 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.028 0.023 0.043 0.02 U 0.02 0.02 U 0.039 0.02 U 0.029 0.02 U 0.02 U 0.055 0.039On-site TP-4-3' 3 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site TP-4-6' 6 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site TP-5-0.5' 0.5 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.04 0.039 0.09 0.02 0.029 0.02 U 0.076 0.02 U 0.054 0.045 0.036 0.098 0.056On-site TP-5-3' 3 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site TP-5-6' 6 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site TP-6-0.5' 0.5 7/13/2010 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 0.86 2.1 1.5 3.6 1.3 1.4 0.4 U 4.3 0.4 U 2.3 0.4 U 2.5 4.8 2.8On-site TP-6-3' 3 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018On-site TP-6-6' 6 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.025 0.02 U 0.02 U 0.02 U 0.022 0.02 U 0.02 U 0.02 U 0.02 U 0.027 0.018On-site TP-7-25S 1.17 7/12/2010 0.4 U 0.4 U 0.4 U 0.57 0.4 U 0.8 2.1 1.5 4.3 1.1 1.2 0.4 U 3.7 0.4 U 2.4 0.4 U 2.4 4.3 2.8On-site TP-7-25D 2.67 7/12/2010 0.2 U 0.2 U 0.2 U 0.25 0.2 U 0.39 1.2 0.86 2.5 0.61 0.62 0.2 U 2.1 0.2 U 1.4 0.28 1.2 2.7 1.6On-site TP-7-40S 1.17 7/12/2010 0.02 U 0.02 U 0.02 U 0.047 0.036 0.12 0.26 0.2 0.29 0.13 0.18 0.033 0.48 0.02 U 0.21 0.038 0.31 0.54 0.34On-site TP-7-40D 2.67 7/12/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.029 0.046 0.02 U 0.02 U 0.02 U 0.031 0.02 U 0.03 0.02 U 0.02 U 0.038 0.021On-site TP-8-0.5' 0.5 7/13/2010 2 U 2 U 2 U 2.9 2.7 14 35 23 48 18 20 4.8 45 2 U 32 3.8 18 50 46On-site TP-8-3' 3 7/13/2010 0.02 U 0.02 U 0.02 U 0.046 0.027 0.2 0.39 0.31 0.47 0.25 0.3 0.055 0.61 0.02 U 0.34 0.031 0.19 0.73 0.52On-site TP-8-6' 6 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.042 0.1 0.087 0.14 0.066 0.064 0.02 U 0.1 0.02 U 0.1 0.02 U 0.031 0.14 0.13On-site TP-9-0.5' 0.5 7/13/2010 2 U 2 U 2 U 2.4 2 U 13 42 27 67 21 19 5.4 44 2 U 41 2 U 8.4 54 54On-site TP-9-3' 3 7/13/2010 0.4 U 0.4 U 0.4 U 0.41 0.4 U 0.76 2.5 1.7 4.2 1.2 1.1 0.4 U 4 0.4 U 2.6 0.4 U 2.1 5 3.2




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On-site TP-9-6' 6 7/13/2010 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.24 0.52 0.32 0.71 0.29 0.33 0.1 U 0.72 0.1 U 0.46 0.1 U 0.18 0.89 0.67On-site TP-9-9' 9 7/13/2010 0.1 U 0.1 U 0.1 U 0.13 0.1 U 0.2 0.63 0.38 0.93 0.27 0.3 0.1 U 1.2 0.1 U 0.55 0.34 0.66 1.6 0.79On-site TP-10-0.5' 0.5 7/13/2010 0.02 U 0.02 U 0.02 U 0.054 0.02 U 0.076 0.17 0.13 0.23 0.087 0.12 0.02 0.4 0.02 U 0.16 0.029 0.24 0.49 0.22On-site TP-10-3' 3 7/13/2010 0.2 U 0.2 U 0.2 U 0.21 0.2 U 0.42 1.3 0.94 2.5 0.59 0.67 0.2 U 1.9 0.2 U 1.5 0.2 U 0.5 2.3 1.7On-site TP-10-6' 6 7/13/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.038 0.12 0.09 0.23 0.057 0.059 0.02 U 0.19 0.02 U 0.14 0.02 U 0.037 0.25 0.16On-site TP-11-0.5' 0.5 7/13/2010 4 U 4 U 4 U 4 U 4 U 30 68 47 84 42 46 9.4 80 4 U 59 5.8 22 95 89On-site TP-11-3' 3 7/13/2010 1 U 1 U 1 U 2.5 1 U 6.8 24 17 45 12 11 3 23 1 U 26 1.2 4.1 30 31On-site TP-11-6' 6 7/13/2010 0.2 U 0.2 U 0.2 U 0.43 0.2 U 0.55 1.5 1.1 2.4 0.85 0.86 0.2 U 2 0.2 U 1.5 0.2 U 0.78 2.4 1.9On-site TP-11-9' 9 7/13/2010 0.4 U 0.4 U 0.4 U 1.7 0.56 2 3.7 2.5 4.1 2.3 2.8 0.47 8.1 0.41 2.9 1.5 8.5 8.8 4.9

LIW Property SB-35-0' 0 11/9/2009 0.5 U 0.5 U 0.5 U 0.86 0.5 U 4.1 7.6 6 12 5 5.3 1.1 11 0.5 U 9.5 2.1 7.3 15 10LIW Property SB-35-3' 3 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.04 0.07 0.058 0.13 0.056 0.049 0.02 U 0.085 0.02 U 0.1 0.02 U 0.053 0.15 0.10LIW Property SB-35-6' 6 11/9/2009 0.02 U 0.02 U 0.044 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-35-9' 9 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-36-0' 0 11/9/2009 0.13 0.18 0.1 U 0.1 U 0.1 U 0.17 0.29 0.32 0.66 0.26 0.23 0.1 U 0.33 0.1 U 0.49 1.3 0.24 0.49 0.43LIW Property SB-36-3' 3 11/9/2009 0.1 U 0.1 U 0.1 U 0.1 U 0.1 U 0.24 0.51 0.54 1.2 0.39 0.34 0.1 U 0.54 0.1 U 0.94 0.1 0.22 0.78 0.74LIW Property SB-36-6' 6 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-36-9' 9 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-37-0' 0 11/9/2009 0.36 0.57 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 5.8 0.21 0.2 U 0.18LIW Property SB-37-3' 3 11/9/2009 0.4 U 0.4 U 0.4 U 0.4 U 0.4 U 1.1 2.3 2.7 4.5 1.5 1.8 0.4 U 2.8 0.4 U 3.6 0.66 0.71 4.1 3.3LIW Property SB-37-6' 6 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.028 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.028 0.04 0.02 U 0.028 0.019LIW Property SB-37-9' 9 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-38-0' 0 11/9/2009 0.4 U 0.49 0.4 U 0.4 U 0.4 U 0.98 1.3 1 1.1 1.3 1.4 0.4 U 1.4 0.4 U 1.2 5 1.2 1.7 1.8LIW Property SB-38-3' 3 11/9/2009 0.02 U 0.022 0.02 U 0.023 0.02 U 0.1 0.2 0.19 0.3 0.16 0.14 0.02 U 0.17 0.02 U 0.24 0.16 0.067 0.26 0.27LIW Property SB-38-6' 6 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-38-9' 9 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-39-0' 0 11/9/2009 0.2 U 0.24 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 0.2 U 2.2 0.2 0.22 0.18LIW Property SB-39-3' 3 11/9/2009 0.024 0.035 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.025 0.02 U 0.02 U 0.36 0.027 0.032 0.018LIW Property SB-39-6' 6 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-39-9' 9 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-39-9' (DUP-6) 9 11/9/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-40-0' 0 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.032 0.052 0.051 0.063 0.041 0.047 0.02 U 0.035 0.02 U 0.053 0.02 U 0.024 0.044 0.074LIW Property SB-40-3' 3 11/10/2009 0.02 U 0.02 U 0.02 U 0.023 0.02 U 0.04 0.092 0.06 0.31 0.061 0.051 0.02 U 0.12 0.02 U 0.14 0.039 0.041 0.11 0.13LIW Property SB-40-6' 6 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-40-9' 9 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-41-0' 0 11/10/2009 0.11 0.16 0.02 U 0.02 U 0.02 U 0.056 0.093 0.084 0.093 0.076 0.08 0.02 U 0.076 0.02 U 0.083 1.4 0.1 0.083 0.13LIW Property SB-41-3' 3 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.026 0.02 U 0.02 U 0.02 U 0.03 0.02 U 0.02 U 0.037 0.029 0.043 0.018LIW Property SB-41-6' 6 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-41-9' 9 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-42-0' 0 11/10/2009 0.065 0.09 0.02 U 0.02 U 0.02 U 0.042 0.074 0.072 0.082 0.065 0.058 0.02 U 0.037 0.02 U 0.077 0.12 0.046 0.047 0.10LIW Property SB-42-3' 3 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-42-6' 6 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-42-9' 9 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-43-0' 0 11/10/2009 0.2 U 0.2 U 0.2 U 0.5 0.46 2.1 3.9 3.3 5.3 2.8 2.8 0.5 6.6 0.2 U 4.3 0.86 5 8.1 5.3




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LIW Property SB-43-3' 3 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.034 0.031 0.058 0.024 0.023 0.02 U 0.044 0.02 U 0.044 0.02 U 0.02 U 0.061 0.049LIW Property SB-43-6' 6 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-43-9' 9 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-44-0' 0 11/10/2009 0.15 0.24 0.02 U 0.02 U 0.02 U 0.026 0.029 0.036 0.03 0.032 0.042 0.02 U 0.043 0.02 U 0.029 1.3 0.1 0.045 0.045LIW Property SB-44-3' 3 11/10/2009 0.02 U 0.02 U 0.02 U 0.045 0.02 U 0.059 0.16 0.17 0.34 0.11 0.093 0.02 U 0.13 0.02 U 0.26 0.078 0.049 0.16 0.22LIW Property SB-44-6' 6 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-44-9' 9 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-45-0' 0 11/10/2009 0.55 0.81 0.02 U 0.02 U 0.04 0.055 0.086 0.088 0.069 0.081 0.085 0.02 U 0.1 0.04 0.073 6.9 0.28 0.087 0.12LIW Property SB-45-3' 3 11/10/2009 0.02 U 0.021 0.02 U 0.02 U 0.02 U 0.03 0.063 0.073 0.093 0.049 0.046 0.02 U 0.064 0.02 U 0.078 0.24 0.025 0.087 0.090LIW Property SB-45-6' 6 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-45-9' 9 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-46-0' 0 11/10/2009 0.1 U 0.14 0.1 U 0.1 U 0.1 U 0.17 0.3 0.29 0.31 0.28 0.27 0.1 U 0.19 0.1 U 0.32 1.1 0.16 0.23 0.43LIW Property SB-46-3' 3 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.055 0.02 U 0.02 U 0.018LIW Property SB-46-6' 6 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018LIW Property SB-46-9' 9 11/10/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-3-0' 0 10/14/2008 -- -- 0.075 U 0.15 U 0.05 U 0.19 0.37 0.35 0.62 0.19 0.34 0.05 U 0.65 0.05 U 0.56 0.57 0.34 0.79 0.51Off-site ROW SB-3-3' 3 10/14/2008 -- -- 0.075 U 0.15 U 0.05 U 0.1 0.23 0.22 0.34 0.066 0.2 0.05 U 0.41 0.05 U 0.33 0.23 0.11 0.44 0.31Off-site ROW SB-3-6' 6 10/14/2008 -- -- 0.075 U 0.15 U 0.05 U 0.15 0.38 0.33 0.59 0.14 0.27 0.05 U 0.87 0.05 U 0.53 0.35 0.49 1 0.51Off-site ROW SB-3-9' 9 10/14/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.062 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088Off-site ROW SB-3-9' (DUP-3) 9 10/14/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088Off-site ROW SB-4-0' 0 10/14/2008 -- -- 0.03 U 0.06 U 0.027 0.33 0.73 0.67 1.1 0.25 0.6 0.02 U 1.4 0.02 U 0.98 0.14 0.45 1.4 0.96Off-site ROW SB-4-3' 3 10/14/2008 -- -- 0.075 U 0.15 U 0.05 U 0.24 0.44 0.54 0.88 0.17 0.48 0.05 U 0.98 0.05 U 0.85 0.54 0.4 1.2 0.63Off-site ROW SB-4-6' 6 10/14/2008 -- -- 0.15 U 0.3 U 0.1 U 0.1 U 0.15 0.14 0.25 0.1 U 0.3 0.1 U 0.24 0.1 U 0.22 0.15 U 0.13 0.33 0.22Off-site ROW SB-4-7' 7 10/14/2008 -- -- 0.3 U 0.6 U 0.2 U 1.6 2.8 3 4.1 1.2 2.4 0.2 U 6.3 0.2 U 3.8 0.95 2.9 6.4 3.8Off-site ROW SB-4-9' 9 10/14/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.073 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088Off-site ROW SB-11-0' 0 10/14/2008 -- -- 0.15 U 0.3 U 0.1 U 0.47 1.1 1 1.8 0.4 0.88 0.1 U 2.1 0.1 U 1.6 0.24 1.1 2.2 1.5Off-site ROW SB-11-3' 3 10/14/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.021 0.019 0.034 0.01 U 0.014 0.01 U 0.029 0.01 U 0.029 0.028 0.01 U 0.036 0.029Off-site ROW SB-11-6' 6 10/14/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.022 0.038 0.01 U 0.022 0.01 U 0.037 0.01 U 0.02 0.034 0.025 0.038 0.012Off-site ROW SB-11-9' 9 10/14/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088Off-site ROW SB-12-0' 0 10/14/2008 -- -- 0.15 U 0.3 U 0.1 U 0.41 1 0.86 1.8 0.34 0.73 0.1 U 2 0.1 U 1.4 0.4 1 2 1.3Off-site ROW SB-12-1.5' 1.5 10/14/2008 -- -- 0.015 U 0.03 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.01 U 0.015 U 0.01 U 0.01 U 0.0088Off-site ROW SB-12-3' 3 10/14/2008 -- -- 1.5 U 3 U 2.1 12 27 24 39 12 19 1 U 31 1.3 37 6.8 32 47 36Off-site ROW SB-12-6' 6 10/14/2008 -- -- 0.3 U 0.83 0.5 2.9 6.5 5.6 8.2 1.9 5.1 0.28 7.9 0.25 7.6 2.6 7.3 13 8.4Off-site ROW SB-12-9' 9 10/14/2008 -- -- 0.15 U 0.3 U 0.1 U 0.25 0.58 0.46 0.77 0.13 0.43 0.1 U 1.2 0.1 U 0.78 0.71 1.1 1.3 0.76Off-site ROW SB-26-0.5' 0.5 11/5/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-26-5' 5 11/5/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-27-0.5' 0.5 11/5/2009 0.02 U 0.02 U 0.02 U 0.24 0.02 U 0.95 1.4 1 1.6 1.1 1.3 0.02 U 3.7 0.02 U 1.4 0.02 U 3.8 4.6 1.9Off-site ROW SB-27-10' (DUP-5) 10 11/5/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-27-5' 5 11/5/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-28-0.5' 0.5 11/5/2009 0.02 U 0.02 U 0.02 U 0.066 0.04 0.25 0.44 0.36 0.67 0.34 0.33 0.069 0.6 0.02 U 0.56 0.051 0.3 0.84 0.62Off-site ROW SB-28-8' 8 11/5/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-29-0.5' 0.5 11/4/2009 0.02 U 0.02 U 0.02 U 0.1 0.02 U 0.078 0.16 0.14 0.31 0.14 0.11 0.02 U 0.19 0.02 U 0.24 0.02 U 0.065 0.27 0.22Off-site ROW SB-29-5' 5 11/4/2009 0.02 U 0.02 U 0.032 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018




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Off-site ROW SB-29-10' 10 11/4/2009 0.02 U 0.02 U 0.035 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-30-0.5' 0.5 11/4/2009 0.02 U 0.02 U 0.02 U 0.061 0.029 0.2 0.46 0.36 0.74 0.32 0.29 0.067 0.45 0.02 U 0.57 0.086 0.19 0.63 0.63Off-site ROW SB-30-5' 5 11/4/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-30-5' (DUP-3) 5 11/4/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.028 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.022 0.02 U 0.02 U 0.027 0.019Off-site ROW SB-30-10' 10 11/4/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-31-0.5' 0.5 11/4/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.037 0.06 0.062 0.12 0.049 0.043 0.02 U 0.1 0.02 U 0.083 0.026 0.047 0.15 0.087Off-site ROW SB-31-5' 5 11/4/2009 0.02 U 0.02 U 0.03 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-31-10' 10 11/4/2009 0.02 U 0.02 U 0.021 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-32-0.5' 0.5 11/4/2009 0.02 U 0.02 U 0.02 U 0.039 0.04 0.14 0.26 0.26 0.55 0.22 0.22 0.02 U 0.57 0.02 U 0.38 0.02 U 0.4 0.76 0.37Off-site ROW SB-32-5' 5 11/4/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.032 0.055 0.057 0.1 0.038 0.04 0.02 U 0.13 0.02 U 0.064 0.02 U 0.076 0.14 0.078Off-site ROW SB-32-10' 10 11/4/2009 0.02 U 0.02 U 0.045 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-33-0.5' 0.5 11/4/2009 10 U 10 U 10 U 41 10 U 78 110 83 150 85 110 16 290 10 U 120 49 340 350 153Off-site ROW SB-33-5' 5 11/4/2009 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-33-10' 10 11/4/2009 0.02 U 0.02 U 0.029 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-47-0.5' 0.5 7/15/2010 1 U 1 U 1 U 2.3 1.3 9.1 18 19 35 14 16 2.4 39 1 U 23 1.2 22 47 25Off-site ROW SB-47-3' 3 7/15/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.051 0.12 0.14 0.35 0.11 0.11 0.021 0.21 0.02 U 0.23 0.02 U 0.076 0.24 0.18Off-site ROW SB-47-6' 6 7/15/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-58-0 0 9/22/2010 0.02 U 0.021 0.02 U 0.02 U 0.02 U 0.046 0.052 0.046 0.024 0.052 0.052 0.02 U 0.02 U 0.02 U 0.022 0.02 U 0.02 0.025 0.073Off-site ROW SB-58-5 5 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-58-10 10 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-59-3 3 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.025 0.02 U 0.02 U 0.02 U 0.02 U 0.027 0.018Off-site ROW SB-59-5 5 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.041 0.02 U 0.02 U 0.02 U 0.02 U 0.075 0.018Off-site ROW SB-59-10 10 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.052 0.056 0.069 0.076 0.059 0.069 0.02 U 0.085 0.02 U 0.045 0.02 U 0.041 0.22 0.083Off-site ROW SB-60-0 0 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-60-5 5 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 0.02 U 0.032 0.02 U 0.026 0.02 U 0.02 U 0.02 U 0.027 0.03 0.018Off-site ROW SB-60-10 10 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-61-0 0 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.018Off-site ROW SB-61-5 5 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.021 0.02 U 0.022 0.02 U 0.026 0.02 U 0.02 U 0.02 U 0.02 U 0.025 0.018Off-site ROW SB-61-10 10 9/22/2010 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.02 U 0.025 0.02 U 0.02 U 0.038 0.02 U 0.02 U 0.02 U 0.15 0.018

Notes:Samples SHADED GRAY are included in the exposed soils (0-0.5 feet bgs) dataset.All analytical results are presented in milligrams per kilogram (mg/kg).-- = not analyzed for. bgs = below ground surfaceDUP = field duplicate sample.LIW = Lodi Iron WorksROW = right-of-wayU = Indicates constituent not detected at concentration equal to or greater than the specified reporting limit.



VOLATILE ORGANIC COMPOUNDSFormer Lodi Manufactured Gas Plant

Lodi, California

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On-site AK-1-30" 2.5 7/15/2010 0.0014 U 0.0014 U 0.0014 U 0.0027 U 0.0014 UOn-site AK-1-38" 3.17 7/15/2010 0.0018 0.00095 U 0.00095 U 0.0019 U 0.00095 UOn-site AK-2-20" 1.7 7/15/2010 0.001 U 0.001 U 0.001 U 0.002 U 0.001 UOn-site AK-2-34" 2.83 7/15/2010 0.0011 U 0.0011 U 0.0011 U 0.0022 U 0.0011 UOn-site AK-3-17" 1.42 7/15/2010 0.0013 U 0.0013 U 0.0013 U 0.0026 U 0.0013 UOn-site SB-1-0' 0 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-1-3' 3 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-1-6' 6 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-1-9' 9 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-2-0' 0 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-2-0' (DUP-6) 0 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-2-3' 3 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-2-6' 6 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-2-9' 9 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-5-0' 0 10/15/2008 0.023 0.005 U 0.018 0.0099 0.005 UOn-site SB-5-6' 6 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-5-9' 9 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-6-7.5' 7.5 10/14/2008 0.14 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-6-9.5' 9.5 10/14/2008 2700 50 500 U 58 19On-site SB-7-0' 0 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-7-3' 3 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-7-6' 6 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-7-6' (DUP-4) 6 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-7-9' 9 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-8-0' 0 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-8-3' 3 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-8-5.5' 5.5 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-8-6' 6 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-8-9' 9 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-9-0' 0 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-9-3' 3 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-9-3' (DUP-1) 3 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-9-6' 6 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-9-9' 9 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-9-9' (DUP-2) 9 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-10-1.5' 1.5 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-10-3' 3 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-10-3' (DUP-5) 3 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-10-6' 6 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-10-9' 9 10/15/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-13-0' 0 10/13/2008 0.5 U 0.5 U 0.5 U 0.5 U 0.5 UOn-site SB-13-3' 3 10/13/2008 0.5 U 0.5 U 0.5 U 0.5 U 0.5 UOn-site SB-13-6' 6 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 U




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On-site SB-13-9' 9 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-14-0' 0 10/13/2008 0.5 U 0.5 U 0.5 U 0.5 U 0.5 UOn-site SB-14-2' 2 10/13/2008 5 U 5 U 5 U 5 U 5 UOn-site SB-14-3' 3 10/13/2008 5 U 5 U 5 U 5 U 5 UOn-site SB-14-6' 6 10/13/2008 0.5 U 0.5 U 0.5 U 0.5 U 0.5 UOn-site SB-14-9' 9 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-15-0' 0 10/13/2008 0.5 U 0.5 U 0.5 U 0.5 U 0.5 UOn-site SB-15-3' 3 10/13/2008 0.5 U 0.5 U 0.5 U 0.5 U 0.5 UOn-site SB-15-6' 6 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-15-9' 9 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-16-1' 1 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-16-3' 3 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-16-6' 6 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-16-9' 9 10/13/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SB-17-1' 1 11/5/2009 0.001 U 0.001 U 0.001 U 0.0021 U 0.001 UOn-site SB-18-0' 0 11/4/2009 0.00079 U 0.00079 U 0.00079 U 0.0016 U 0.00079 UOn-site SB-18-8' 8 11/4/2009 0.00066 U 0.00066 U 0.00066 U 0.0013 U 0.00066 UOn-site SB-19-5' 5 11/5/2009 0.00092 U 0.00092 U 0.00092 U 0.0018 U 0.00092 UOn-site SB-20-0' 0 11/4/2009 0.0047 0.00064 U 0.00064 U 0.0013 U 0.00064 UOn-site SB-21-0' 0 11/3/2009 0.00077 0.0006 U 0.00062 0.0012 U 0.0006 UOn-site SB-21-5' 5 11/2/2009 0.0009 U 0.0009 U 0.0009 U 0.0018 U 0.0009 UOn-site SB-21-10' 10 11/2/2009 0.00078 U 0.00078 U 0.00078 U 0.0016 U 0.00078 UOn-site SB-22-0' 0 11/2/2009 0.0018 0.00056 U 0.00056 U 0.0011 U 0.00056 UOn-site SB-22-5' 5 11/2/2009 0.00056 U 0.00056 U 0.00056 U 0.0011 U 0.00056 UOn-site SB-22-10' 10 11/2/2009 0.00062 U 0.00062 U 0.00062 U 0.0012 U 0.00062 UOn-site SB-23-0' 0 11/2/2009 0.0012 0.00071 U 0.0019 0.0014 U 0.00071 UOn-site SB-23-10' 10 11/2/2009 0.00069 U 0.00069 U 0.00069 U 0.0014 U 0.00069 UOn-site SB-24-0' 0 11/2/2009 0.00086 U 0.00086 U 0.00086 U 0.0017 U 0.00086 UOn-site SB-24-5' 5 11/2/2009 0.00074 U 0.00074 U 0.00074 U 0.0015 U 0.00074 UOn-site SB-24-10' 10 11/2/2009 0.00057 U 0.00057 U 0.00057 U 0.0011 U 0.00057 UOn-site SB-25-0' 0 11/2/2009 0.035 0.00067 U 0.0025 0.0013 U 0.00067 UOn-site SB-25-5' 5 11/2/2009 0.00042 U 0.00042 U 0.00042 U 0.00085 U 0.00042 UOn-site SB-25-10' 10 11/2/2009 0.00042 U 0.00042 U 0.00042 U 0.00085 U 0.00042 UOn-site SB-34-0' 0 11/3/2009 0.0038 0.00063 U 0.00063 U 0.0013 U 0.00063 UOn-site SB-34-8' 8 11/3/2009 0.00086 U 0.00086 U 0.00086 U 0.0017 U 0.00086 UOn-site SB-48-1.5' 1.5 7/13/2010 0.0016 0.00061 U 0.00061 U 0.0012 U 0.00061 UOn-site SB-48-3' 3 7/13/2010 0.001 U 0.001 U 0.001 U 0.002 U 0.001 UOn-site SB-48-6' 6 7/13/2010 0.00054 U 0.00054 U 0.00054 U 0.0011 U 0.00054 UOn-site SB-49-3' 3 7/13/2010 0.001 0.00055 U 0.00055 U 0.0011 U 0.00055 UOn-site SB-49-4' 4 7/13/2010 0.81 0.64 0.99 1.1 0.47On-site SB-49-6' 6 7/13/2010 0.00061 U 0.00061 U 0.00061 U 0.0012 U 0.00061 UOn-site SB-50-1.5' 1.5 7/13/2010 0.03 U 0.00073 U 0.00073 U 0.0015 U 0.00073 UOn-site SB-50-3' 3 7/13/2010 0.00064 U 0.00064 U 0.00064 U 0.0013 U 0.00064 U




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On-site SB-50-6' 6 7/13/2010 0.00066 U 0.00066 U 0.00066 U 0.0013 U 0.00066 UOn-site SB-51-1.5' 1.5 7/13/2010 0.013 0.00058 U 0.00073 0.0012 U 0.00058 UOn-site SB-51-3' 3 7/13/2010 0.0034 0.00062 U 0.00062 U 0.0012 U 0.00062 UOn-site SB-51-6.5' 6.5 7/13/2010 0.0054 0.00052 U 0.00052 U 0.001 U 0.00052 UOn-site SB-51-9' 9 7/13/2010 0.00071 U 0.00071 U 0.00071 U 0.0014 U 0.00071 UOn-site SB-52-1' 1 7/12/2010 0.00069 U 0.00069 U 0.00069 U 0.0014 U 0.00069 UOn-site SB-52-3' 3 7/12/2010 0.00074 U 0.00074 U 0.00074 U 0.0015 U 0.00074 UOn-site SB-52-6' 6 7/12/2010 0.00059 U 0.00059 U 0.00059 U 0.0012 U 0.00059 UOn-site SB-52-9' 9 7/12/2010 0.00052 U 0.00052 U 0.00052 U 0.001 U 0.00052 UOn-site SB-53-0.5' 0.5 7/12/2010 0.00058 U 0.00058 U 0.00058 U 0.0012 U 0.00058 UOn-site SB-53-3' 3 7/13/2010 0.00052 U 0.00052 U 0.00052 U 0.001 U 0.00052 UOn-site SB-53-6' 6 7/13/2010 0.00056 U 0.00056 U 0.00056 U 0.0011 U 0.00056 UOn-site SB-53-9' 9 7/13/2010 0.00076 U 0.00076 U 0.00076 U 0.0015 U 0.00076 UOn-site SB-54-1' 1 7/12/2010 0.00078 U 0.00078 U 0.00078 U 0.0016 U 0.00078 UOn-site SB-54-3' 3 7/12/2010 0.00062 U 0.00062 U 0.00062 U 0.0012 U 0.00062 UOn-site SB-54-6' 6 7/12/2010 0.0006 U 0.0006 U 0.0006 U 0.0012 U 0.0006 UOn-site SB-54-9' 9 7/12/2010 0.00067 U 0.00067 U 0.00067 U 0.0013 U 0.00067 UOn-site SB-55-1.5' 1.5 7/13/2010 0.00043 U 0.00043 U 0.00043 U 0.00086 U 0.00043 UOn-site SB-55-3' 3 7/13/2010 0.00057 U 0.00057 U 0.00057 U 0.0011 U 0.00057 UOn-site SB-55-6' 6 7/13/2010 0.00083 U 0.00083 U 0.00083 U 0.0017 U 0.00083 UOn-site SB-55-9' 9 7/13/2010 0.00068 U 0.00068 U 0.00068 U 0.0014 U 0.00068 UOn-site SB-56-0.5' 0.5 7/14/2010 0.00076 U 0.00076 U 0.00076 U 0.0015 U 0.00076 UOn-site SB-56-3' 3 7/14/2010 0.00066 U 0.00066 U 0.00066 U 0.0013 U 0.00066 UOn-site SB-56-6' 6 7/14/2010 0.00058 U 0.00058 U 0.00058 U 0.0012 U 0.00058 UOn-site SB-56-9' 9 7/14/2010 0.00087 U 0.00087 U 0.00087 U 0.0017 U 0.00087 UOn-site SB-62-0 0 9/22/2010 0.0057 0.00038 U 0.0072 0.001 0.00038 UOn-site SB-62-5 5 9/22/2010 0.00075 0.00043 U 0.00043 U 0.00085 U 0.00043 UOn-site SB-62-10 10 9/22/2010 0.00035 U 0.00035 U 0.00035 U 0.00069 U 0.00035 UOn-site SB-63-1 1 9/23/2010 0.002 0.00043 U 0.00043 U 0.00086 U 0.00043 UOn-site SB-63-5 5 9/23/2010 0.00031 U 0.00031 U 0.00031 U 0.00062 U 0.00031 UOn-site SB-63-10 10 9/23/2010 0.0003 U 0.0003 U 0.0003 U 0.00059 U 0.0003 UOn-site SB-64-1 1 9/22/2010 0.00035 0.0003 U 0.0003 U 0.00061 U 0.0003 UOn-site SB-64-5 5 9/22/2010 0.00038 0.0003 U 0.0003 U 0.0006 U 0.0003 UOn-site SB-64-10 10 9/22/2010 0.00025 U 0.00025 U 0.00025 U 0.00051 U 0.00025 UOn-site SB-65-1 1 9/23/2010 0.001 0.00027 U 0.00027 U 0.00053 U 0.00027 UOn-site SB-65-5 5 9/23/2010 0.0018 0.00034 U 0.00034 U 0.00069 U 0.00034 UOn-site SB-65-10 10 9/23/2010 0.00027 U 0.00027 U 0.00027 U 0.00054 U 0.00027 UOn-site SB-66-0 0 9/23/2010 0.00024 U 0.00024 U 0.00024 U 0.00049 U 0.00024 UOn-site SB-66-5 5 9/23/2010 0.00025 U 0.00025 U 0.00025 U 0.00051 U 0.00025 UOn-site SB-66-10 10 9/23/2010 0.00022 U 0.00022 U 0.00022 U 0.00043 U 0.00022 UOn-site SB-67-0 0 9/23/2010 0.00034 U 0.00034 U 0.006 0.00068 U 0.00034 UOn-site SB-67-5 5 9/23/2010 0.00037 U 0.00037 U 0.00037 U 0.00075 U 0.00037 UOn-site SB-67-10 10 9/23/2010 0.00027 U 0.00027 U 0.00027 U 0.00054 U 0.00027 U




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On-site SB-68-0 0 9/23/2010 0.0011 0.00038 U 0.0034 0.0013 0.00058On-site SB-68-5 5 9/23/2010 0.00029 U 0.00029 U 0.00076 0.00058 U 0.00029 UOn-site SB-68-10 10 9/23/2010 0.00033 0.00028 U 0.00065 0.00056 U 0.00028 UOn-site SB-69-0 0 9/23/2010 0.086 0.061 0.99 0.39 0.17On-site SB-69-5 5 9/23/2010 0.00027 U 0.00027 U 0.0049 0.0007 0.00027 UOn-site SB-69-10 10 9/23/2010 0.0003 U 0.0003 U 0.0007 0.0006 U 0.0003 UOn-site SS-1 0 2/24/2006 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SS-2 0 2/24/2006 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SS-3 0 2/24/2006 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOn-site SS-4 0 2/24/2006 0.025 U 0.025 U 0.025 U 0.025 U 0.025 UOn-site SS-5 0 2/24/2006 0.025 U 0.025 U 0.025 U 0.025 U 0.025 UOn-site SS-6 0 2/24/2006 0.025 U 0.025 U 0.025 U 0.025 U 0.025 UOn-site SS-7 0 2/24/2006 0.025 U 0.025 U 0.025 U 0.025 U 0.025 UOn-site SS-8 0 2/24/2006 0.025 U 0.025 U 0.025 U 0.025 U 0.025 UOn-site SS-9 0 2/24/2006 0.025 U 0.025 U 0.025 U 0.025 U 0.025 UOn-site TP-1-0.5' 0.5 7/12/2010 0.0009 U 0.0009 U 0.0009 U 0.0018 U 0.0009 UOn-site TP-1-3' 3 7/12/2010 0.00092 U 0.00092 U 0.00092 U 0.0018 U 0.00092 UOn-site TP-1-6' 6 7/12/2010 0.0011 U 0.0011 U 0.0011 U 0.0022 U 0.0011 UOn-site TP-2-0.5' 0.5 7/12/2010 0.0011 U 0.0011 U 0.0011 U 0.0023 U 0.0011 UOn-site TP-2-3' 3 7/12/2010 0.001 U 0.001 U 0.001 U 0.002 U 0.001 UOn-site TP-2-6' 6 7/12/2010 0.0011 U 0.0011 U 0.0011 U 0.0022 U 0.0011 UOn-site TP-2-9' 9 7/12/2010 0.0011 U 0.0011 U 0.0011 U 0.0023 U 0.0011 UOn-site TP-3-0.5' 0.5 7/12/2010 0.001 U 0.001 U 0.001 U 0.0021 U 0.001 UOn-site TP-3-3' 3 7/12/2010 0.0011 U 0.0011 U 0.0011 U 0.0022 U 0.0011 UOn-site TP-3-6' 6 7/12/2010 0.0011 U 0.0011 U 0.0011 U 0.0021 U 0.0011 UOn-site TP-4-0.5' 0.5 7/12/2010 0.001 U 0.001 U 0.001 U 0.0021 U 0.001 UOn-site TP-4-3' 3 7/12/2010 0.001 U 0.001 U 0.001 U 0.0021 U 0.001 UOn-site TP-4-6' 6 7/12/2010 0.001 U 0.001 U 0.001 U 0.002 U 0.001 UOn-site TP-5-0.5' 0.5 7/13/2010 0.001 U 0.001 U 0.001 U 0.0021 U 0.001 UOn-site TP-5-3' 3 7/13/2010 0.0016 U 0.0016 U 0.0016 U 0.0031 U 0.0016 UOn-site TP-5-6' 6 7/13/2010 0.00096 U 0.00096 U 0.00096 U 0.0019 U 0.00096 UOn-site TP-6-0.5' 0.5 7/13/2010 0.0015 0.00099 U 0.00099 U 0.002 U 0.00099 UOn-site TP-6-3' 3 7/13/2010 0.0011 U 0.0011 U 0.0011 U 0.0022 U 0.0011 UOn-site TP-6-6' 6 7/13/2010 0.0011 U 0.0011 U 0.0011 U 0.0021 U 0.0011 UOn-site TP-7-25S 1.17 7/12/2010 0.0014 0.0022 0.0044 0.016 0.0061On-site TP-7-25D 2.67 7/12/2010 0.0008 U 0.0008 U 0.0008 U 0.0016 U 0.0008 UOn-site TP-7-40S 1.17 7/12/2010 0.00097 U 0.00097 U 0.00097 U 0.0019 U 0.00097 UOn-site TP-7-40D 2.67 7/12/2010 0.00085 U 0.00085 U 0.00085 U 0.0017 U 0.00085 UOn-site TP-8-0.5' 0.5 7/13/2010 0.0017 0.0011 U 0.0011 U 0.0023 U 0.0011 UOn-site TP-8-3' 3 7/13/2010 0.001 U 0.001 U 0.001 U 0.002 U 0.001 UOn-site TP-8-6' 6 7/13/2010 0.001 U 0.001 U 0.001 U 0.002 U 0.001 UOn-site TP-9-0.5' 0.5 7/13/2010 0.13 0.0011 U 0.0023 0.0022 U 0.0011 UOn-site TP-9-3' 3 7/13/2010 0.0017 0.001 U 0.001 U 0.002 U 0.001 U




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On-site TP-9-6' 6 7/13/2010 0.0064 0.001 U 0.001 U 0.002 U 0.001 UOn-site TP-9-9' 9 7/13/2010 0.00095 U 0.00095 U 0.00095 U 0.0019 U 0.00095 UOn-site TP-10-0.5' 0.5 7/13/2010 0.001 U 0.001 U 0.001 U 0.002 U 0.001 UOn-site TP-10-3' 3 7/13/2010 0.001 U 0.001 U 0.001 U 0.002 U 0.001 UOn-site TP-10-6' 6 7/13/2010 0.0011 U 0.0011 U 0.0011 U 0.0022 U 0.0011 UOn-site TP-11-0.5' 0.5 7/13/2010 0.013 0.0012 U 0.0012 U 0.0023 U 0.0012 UOn-site TP-11-3' 3 7/13/2010 0.0059 0.0013 U 0.0013 U 0.0025 U 0.0013 UOn-site TP-11-6' 6 7/13/2010 0.0014 0.0011 U 0.0011 U 0.0022 U 0.0011 UOn-site TP-11-9' 9 7/13/2010 0.0012 U 0.0012 U 0.0012 U 0.0023 U 0.0012 U

LIW Property SB-35-0' 0 11/9/2009 0.0032 0.0012 U 0.0012 U 0.0023 U 0.0012 ULIW Property SB-35-3' 3 11/9/2009 0.00093 U 0.00093 U 0.00093 U 0.0019 U 0.00093 ULIW Property SB-35-6' 6 11/9/2009 0.00085 U 0.00085 U 0.00085 U 0.0017 U 0.00085 ULIW Property SB-35-9' 9 11/9/2009 0.00078 U 0.00078 U 0.00078 U 0.0016 U 0.00078 ULIW Property SB-36-0' 0 11/9/2009 0.0015 0.0012 U 0.0012 U 0.0023 U 0.0012 ULIW Property SB-36-3' 3 11/9/2009 0.0012 U 0.0012 U 0.0012 U 0.0025 U 0.0012 ULIW Property SB-36-6' 6 11/9/2009 0.00091 U 0.00091 U 0.00091 U 0.0018 U 0.00091 ULIW Property SB-36-9' 9 11/9/2009 0.00098 U 0.00098 U 0.00098 U 0.002 U 0.00098 ULIW Property SB-37-0' 0 11/9/2009 0.0014 0.0011 U 0.0011 U 0.0021 U 0.0011 ULIW Property SB-37-3' 3 11/9/2009 0.0013 0.0011 U 0.0011 U 0.0022 U 0.0011 ULIW Property SB-37-6' 6 11/9/2009 0.00096 U 0.00096 U 0.00096 U 0.0019 U 0.00096 ULIW Property SB-37-9' 9 11/9/2009 0.001 U 0.001 U 0.001 U 0.002 U 0.001 ULIW Property SB-38-0' 0 11/9/2009 0.0017 0.00095 U 0.00095 U 0.0019 U 0.00095 ULIW Property SB-38-3' 3 11/9/2009 0.0011 U 0.0011 U 0.0011 U 0.0022 U 0.0011 ULIW Property SB-38-6' 6 11/9/2009 0.0011 U 0.0011 U 0.0011 U 0.0021 U 0.0011 ULIW Property SB-38-9' 9 11/9/2009 0.0011 U 0.0011 U 0.0011 U 0.002 U 0.0011 ULIW Property SB-39-0' 0 11/9/2009 0.0011 U 0.0011 U 0.0011 U 0.0022 U 0.0011 ULIW Property SB-39-3' 3 11/9/2009 0.001 U 0.001 U 0.001 U 0.0021 U 0.001 ULIW Property SB-39-6' 6 11/9/2009 0.001 U 0.001 U 0.001 U 0.002 U 0.001 ULIW Property SB-39-9' 9 11/9/2009 0.0011 U 0.0011 U 0.0011 U 0.0021 U 0.0011 ULIW Property SB-39-9' (DUP-6) 9 11/9/2009 0.0011 U 0.0011 U 0.0011 U 0.0021 U 0.0011 ULIW Property SB-40-0' 0 11/10/2009 0.0011 0.0011 U 0.0013 0.0021 U 0.0011 ULIW Property SB-40-3' 3 11/10/2009 0.0022 0.0012 U 0.0012 U 0.0024 U 0.0012 ULIW Property SB-40-6' 6 11/10/2009 0.00097 U 0.00097 U 0.00097 U 0.0019 U 0.00097 ULIW Property SB-40-9' 9 11/10/2009 0.00095 U 0.00095 U 0.00095 U 0.0019 U 0.00095 ULIW Property SB-41-0' 0 11/10/2009 0.0017 0.001 U 0.001 U 0.002 U 0.001 ULIW Property SB-41-3' 3 11/10/2009 0.00085 U 0.00085 U 0.00085 U 0.0017 U 0.00085 ULIW Property SB-41-6' 6 11/10/2009 0.00099 U 0.00099 U 0.00099 U 0.002 U 0.00099 ULIW Property SB-41-9' 9 11/10/2009 0.00089 U 0.00089 U 0.00089 U 0.0018 U 0.00089 ULIW Property SB-42-0' 0 11/10/2009 0.0034 0.0011 U 0.0013 0.0022 U 0.0011 ULIW Property SB-42-3' 3 11/10/2009 0.00095 U 0.00095 U 0.00095 U 0.0019 U 0.00095 ULIW Property SB-42-6' 6 11/10/2009 0.0008 U 0.0008 U 0.0008 U 0.0016 U 0.0008 ULIW Property SB-42-9' 9 11/10/2009 0.00086 U 0.00086 U 0.00086 U 0.0017 U 0.00086 ULIW Property SB-43-0' 0 11/10/2009 0.009 0.00097 U 0.001 0.0019 U 0.00097 U




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LIW Property SB-43-3' 3 11/10/2009 0.001 U 0.001 U 0.001 U 0.0021 U 0.001 ULIW Property SB-43-6' 6 11/10/2009 0.00092 U 0.00092 U 0.00092 U 0.0018 U 0.00092 ULIW Property SB-43-9' 9 11/10/2009 0.00097 U 0.00097 U 0.00097 U 0.0019 U 0.00097 ULIW Property SB-44-0' 0 11/10/2009 0.047 U 0.047 U 0.067 0.094 U 0.047 ULIW Property SB-44-3' 3 11/10/2009 0.00098 U 0.00098 U 0.00098 U 0.002 U 0.00098 ULIW Property SB-44-6' 6 11/10/2009 0.001 U 0.001 U 0.001 U 0.002 U 0.001 ULIW Property SB-44-9' 9 11/10/2009 0.00099 U 0.00099 U 0.00099 U 0.002 U 0.00099 ULIW Property SB-45-0' 0 11/10/2009 0.0019 0.0011 U 0.0012 0.0022 U 0.0011 ULIW Property SB-45-3' 3 11/10/2009 0.0012 U 0.0012 U 0.0012 U 0.0024 U 0.0012 ULIW Property SB-45-6' 6 11/10/2009 0.00086 U 0.00086 U 0.00086 U 0.0017 U 0.00086 ULIW Property SB-45-9' 9 11/10/2009 0.00088 U 0.00088 U 0.00088 U 0.0018 U 0.00088 ULIW Property SB-46-0' 0 11/10/2009 0.003 0.00099 U 0.0019 0.002 U 0.00099 ULIW Property SB-46-3' 3 11/10/2009 0.0011 U 0.0011 U 0.0011 U 0.0022 U 0.0011 ULIW Property SB-46-6' 6 11/10/2009 0.00093 U 0.00093 U 0.00093 U 0.0019 U 0.00093 ULIW Property SB-46-9' 9 11/10/2009 0.00083 U 0.00083 U 0.00083 U 0.0017 U 0.00083 UOff-site ROW SB-3-0' 0 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-3-3' 3 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-3-6' 6 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-3-9' 9 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-3-9' (DUP-3) 9 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-4-0' 0 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-4-3' 3 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-4-6' 6 10/14/2008 0.0095 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-4-7' 7 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-4-9' 9 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-11-0' 0 10/14/2008 0.022 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-11-3' 3 10/14/2008 0.017 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-11-6' 6 10/14/2008 0.0063 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-11-9' 9 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-12-0' 0 10/14/2008 0.016 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-12-1.5' 1.5 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-12-3' 3 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-12-6' 6 10/14/2008 0.0077 0.005 U 0.0068 0.005 U 0.005 UOff-site ROW SB-12-9' 9 10/14/2008 0.005 U 0.005 U 0.005 U 0.005 U 0.005 UOff-site ROW SB-26-0.5' 0.5 11/5/2009 0.00092 U 0.00092 U 0.00092 U 0.0018 U 0.00092 UOff-site ROW SB-26-5' 5 11/5/2009 0.00081 U 0.00081 U 0.00081 U 0.0016 U 0.00081 UOff-site ROW SB-27-0.5' 0.5 11/5/2009 0.00087 U 0.00087 U 0.00087 U 0.0017 U 0.00087 UOff-site ROW SB-27-5' 5 11/5/2009 0.00077 U 0.00077 U 0.00077 U 0.0015 U 0.00077 UOff-site ROW SB-27-10' (DUP-5) 10 11/5/2009 0.00091 U 0.00091 U 0.00091 U 0.0018 U 0.00091 UOff-site ROW SB-28-0.5' 0.5 11/5/2009 0.00092 U 0.00092 U 0.00092 U 0.0018 U 0.00092 UOff-site ROW SB-28-8' 8 11/5/2009 0.0009 U 0.0009 U 0.0009 U 0.0018 U 0.0009 UOff-site ROW SB-29-0.5' 0.5 11/4/2009 0.00087 U 0.00087 U 0.00087 U 0.0017 U 0.00087 UOff-site ROW SB-29-5' 5 11/4/2009 0.00077 U 0.00077 U 0.00077 U 0.0015 U 0.00077 U




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Off-site ROW SB-29-10' 10 11/4/2009 0.00078 U 0.00078 U 0.00078 U 0.0016 U 0.00078 UOff-site ROW SB-30-0.5' 0.5 11/4/2009 0.00091 U 0.00091 U 0.00091 U 0.0018 U 0.00091 UOff-site ROW SB-30-5' 5 11/4/2009 0.00083 U 0.00083 U 0.00083 U 0.0017 U 0.00083 UOff-site ROW SB-30-5' (DUP-3) 5 11/4/2009 0.00087 U 0.00087 U 0.00087 U 0.0017 U 0.00087 UOff-site ROW SB-30-10' 10 11/4/2009 0.00083 U 0.00083 U 0.00083 U 0.0017 U 0.00083 UOff-site ROW SB-31-0.5' 0.5 11/4/2009 0.00084 U 0.00084 U 0.00084 U 0.0017 U 0.00084 UOff-site ROW SB-31-5' 5 11/4/2009 0.00075 U 0.00075 U 0.00075 U 0.0015 U 0.00075 UOff-site ROW SB-31-10' 10 11/4/2009 0.00077 U 0.00077 U 0.00077 U 0.0015 U 0.00077 UOff-site ROW SB-32-0.5' 0.5 11/4/2009 0.00086 U 0.00086 U 0.00086 U 0.0017 U 0.00086 UOff-site ROW SB-32-5' 5 11/4/2009 0.00089 U 0.00089 U 0.00089 U 0.0018 U 0.00089 UOff-site ROW SB-32-10' 10 11/4/2009 0.00082 U 0.00082 U 0.00082 U 0.0016 U 0.00082 UOff-site ROW SB-33-0.5' 0.5 11/4/2009 0.051 0.00076 U 0.0035 0.0015 U 0.00076 UOff-site ROW SB-33-5' 5 11/4/2009 0.00076 U 0.00076 U 0.00076 U 0.0015 U 0.00076 UOff-site ROW SB-33-10' 10 11/4/2009 0.00084 U 0.00084 U 0.00084 U 0.0017 U 0.00084 UOff-site ROW SB-47-0.5' 0.5 7/15/2010 0.00069 U 0.00069 U 0.00069 U 0.0014 U 0.00069 UOff-site ROW SB-47-3' 3 7/15/2010 0.00084 U 0.00084 U 0.00084 U 0.0017 U 0.00084 UOff-site ROW SB-47-6' 6 7/15/2010 0.00075 U 0.00075 U 0.00075 U 0.0015 U 0.00075 UOff-site ROW SB-58-0 0 9/22/2010 0.00081 0.00021 U 0.00021 U 0.00042 U 0.00021 UOff-site ROW SB-58-5 5 9/22/2010 0.00034 U 0.00034 U 0.00034 U 0.00067 U 0.00034 UOff-site ROW SB-58-10 10 9/22/2010 0.00024 U 0.00024 U 0.00024 U 0.00049 U 0.00024 UOff-site ROW SB-59-3 3 9/22/2010 0.0073 0.00055 U 0.00064 0.0011 U 0.00055 UOff-site ROW SB-59-5 5 9/22/2010 0.0003 U 0.0003 U 0.0003 U 0.0006 U 0.0003 UOff-site ROW SB-59-10 10 9/22/2010 0.00038 U 0.00038 U 0.00038 U 0.00075 U 0.00038 UOff-site ROW SB-60-0 0 9/22/2010 0.00028 U 0.00028 U 0.00028 U 0.00056 U 0.00028 UOff-site ROW SB-60-5 5 9/22/2010 0.00021 U 0.00021 U 0.00021 U 0.00042 U 0.00021 UOff-site ROW SB-60-10 10 9/22/2010 0.00022 U 0.00022 U 0.00022 U 0.00045 U 0.00022 UOff-site ROW SB-61-0 0 9/22/2010 0.00035 U 0.00035 U 0.00035 U 0.0007 U 0.00035 UOff-site ROW SB-61-5 5 9/22/2010 0.00026 U 0.00026 U 0.00026 U 0.00053 U 0.00026 UOff-site ROW SB-61-10 10 9/22/2010 0.00035 U 0.00035 U 0.00035 U 0.00069 U 0.00035 U

Notes:Samples SHADED GRAY are included in the exposed soils (0-0.5 feet bgs) dataset.All analytical results are presented in milligrams per kilogram (mg/kg).-- = not analyzed for. bgs = below ground surfaceDUP = field duplicate sample.LIW = Lodi Iron WorksROW = right-of-wayU = Indicates constituent not detected at concentration equal to or greater than the specified reporting limit.



TOTAL PETROLEUM HYDROCARBONSFormer Lodi Manufactured Gas Plant

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On-site AK-1-30" 2.5 7/15/2010 0.5 U 15 43On-site AK-1-38" 3.17 7/15/2010 0.5 U 5 U 25 UOn-site AK-2-20" 1.7 7/15/2010 0.5 U 5 U 25 UOn-site AK-2-34" 2.83 7/15/2010 0.5 U 5 U 25 UOn-site AK-3-17" 1.42 7/15/2010 0.5 U 5 U 25 UOn-site SB-1-0' 0 10/15/2008 0.5 U 30 65 JOn-site SB-1-3' 3 10/15/2008 0.5 U 5 U 25 UOn-site SB-1-6' 6 10/15/2008 0.5 U 5 U 25 UOn-site SB-1-9' 9 10/15/2008 0.5 U 5 U 25 UOn-site SB-2-0' 0 10/15/2008 0.5 U 5 U 25 UOn-site SB-2-0' (DUP-6) 0 10/15/2008 0.5 U 5 U 25 UOn-site SB-2-3' 3 10/15/2008 0.5 U 11 25 UOn-site SB-2-6' 6 10/15/2008 0.5 U 5 U 25 UOn-site SB-2-9' 9 10/15/2008 0.5 U 5 U 25 UOn-site SB-5-0' 0 10/15/2008 0.69 2500 J 7000On-site SB-5-6' 6 10/15/2008 0.5 U 5 U 25 UOn-site SB-5-9' 9 10/15/2008 0.5 U 5 U 25 UOn-site SB-6-7.5' 7.5 10/14/2008 1.6 J 1400 J 2600On-site SB-6-9.5' 9.5 10/14/2008 2800 42000 J 29000On-site SB-7-0' 0 10/15/2008 330 J 6200 11000 JOn-site SB-7-3' 3 10/15/2008 0.5 U 110 260 JOn-site SB-7-6' 6 10/15/2008 17 J 2600 5800 JOn-site SB-7-6' (DUP-4) 6 10/15/2008 1.1 J 36 J 98 JOn-site SB-7-9' 9 10/15/2008 0.5 U 5 U 25 UOn-site SB-8-0' 0 10/15/2008 5 U 5 U 25 UOn-site SB-8-3' 3 10/15/2008 5 U 5.7 25 UOn-site SB-8-5.5' 5.5 10/15/2008 12 J 4100 6700 JOn-site SB-8-6' 6 10/15/2008 5 U 5 U 25 UOn-site SB-8-9' 9 10/15/2008 5 U 5 U 25 UOn-site SB-9-0' 0 10/13/2008 0.5 U 940 J 3000On-site SB-9-3' 3 10/13/2008 0.5 U 17 J 39On-site SB-9-3' (DUP-1) 3 10/13/2008 0.5 U 11 25 UOn-site SB-9-6' 6 10/13/2008 0.5 U 150 J 960 JOn-site SB-9-9' 9 10/13/2008 0.5 U 5 U 25 UOn-site SB-9-9' (DUP-2) 9 10/13/2008 0.5 U 53 J 150On-site SB-10-1.5' 1.5 10/15/2008 7.7 J 3000 7800 JOn-site SB-10-3' 3 10/15/2008 0.5 U 220 810 JOn-site SB-10-3' (DUP-5) 3 10/15/2008 0.5 U 7.8 26On-site SB-10-6' 6 10/15/2008 0.5 U 13 48On-site SB-10-9' 9 10/15/2008 0.5 U 5 U 25 UOn-site SB-13-0' 0 10/13/2008 0.5 U 3300 J 6000 JOn-site SB-13-3' 3 10/13/2008 0.5 U 650 J 1300 JOn-site SB-13-6' 6 10/13/2008 0.5 U 5 U 25 U




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On-site SB-13-9' 9 10/13/2008 0.5 U 5 U 25 UOn-site SB-14-0' 0 10/13/2008 0.5 U 2200 J 7400On-site SB-14-2' 2 10/13/2008 1100 J 27000 J 27000 JOn-site SB-14-3' 3 10/13/2008 460 J 4300 J 5000 JOn-site SB-14-6' 6 10/13/2008 49 J 770 J 880On-site SB-14-9' 9 10/13/2008 0.5 U 5 U 25 UOn-site SB-15-0' 0 10/13/2008 0.5 U 3000 J 9900On-site SB-15-3' 3 10/13/2008 0.5 U 3100 J 8700On-site SB-15-6' 6 10/13/2008 0.5 U 490 J 1400On-site SB-15-9' 9 10/13/2008 0.5 U 9.5 25 UOn-site SB-16-1' 1 10/13/2008 0.5 U 430 J 980 JOn-site SB-16-3' 3 10/13/2008 0.5 U 160 J 820On-site SB-16-6' 6 10/13/2008 0.5 U 240 J 1300On-site SB-16-9' 9 10/13/2008 0.5 U 5 U 25 UOn-site SB-17-1' 1 11/5/2009 0.5 U 1900 4900On-site SB-18-0' 0 11/4/2009 0.5 U 1800 6900On-site SB-18-8' 8 11/4/2009 31 1200 6000On-site SB-19-5' 5 11/5/2009 0.5 U 1500 2900On-site SB-20-0' 0 11/4/2009 0.5 U 420 1100On-site SB-21-0' 0 11/3/2009 0.5 U 57 180On-site SB-21-5' 5 11/2/2009 0.5 U 5 U 25 UOn-site SB-21-10' 10 11/2/2009 0.5 U 5 U 25 UOn-site SB-22-0' 0 11/2/2009 0.5 U 63 180On-site SB-22-5' 5 11/2/2009 0.5 U 5 U 25 UOn-site SB-22-10' 10 11/2/2009 0.5 U 5 U 25 UOn-site SB-23-0' 0 11/2/2009 0.5 U 2800 8300On-site SB-23-10' 10 11/2/2009 0.5 U 5 U 25 UOn-site SB-24-0' 0 11/2/2009 0.5 U 84 240On-site SB-24-5' 5 11/2/2009 0.5 U 5 U 25 UOn-site SB-24-10' 10 11/2/2009 0.5 U 12 25 UOn-site SB-25-0' 0 11/2/2009 0.5 U 1600 4100On-site SB-25-5' 5 11/2/2009 0.5 U 5 U 25 UOn-site SB-25-10' 10 11/2/2009 0.5 U 5 U 25 UOn-site SB-34-0' 0 11/3/2009 0.5 U 1900 7300On-site SB-34-8' 8 11/3/2009 0.5 U 2200 5900On-site SB-48-1.5' 1.5 7/13/2010 0.5 U 400 1100On-site SB-48-3' 3 7/13/2010 0.5 U 270 860On-site SB-48-6' 6 7/13/2010 0.5 U 5 U 25 UOn-site SB-49-3' 3 7/13/2010 0.5 U 280 940On-site SB-49-4' 4 7/13/2010 2500 12000 17000On-site SB-49-6' 6 7/13/2010 0.55 18 45On-site SB-50-1.5' 1.5 7/13/2010 0.5 U 500 1000On-site SB-50-3' 3 7/13/2010 0.5 U 5 U 25 U




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On-site SB-50-6' 6 7/13/2010 0.5 U 5 U 25 UOn-site SB-51-1.5' 1.5 7/13/2010 0.5 U 130 250On-site SB-51-3' 3 7/13/2010 0.5 U 160 250On-site SB-51-6.5' 6.5 7/13/2010 0.5 U 12000 18000On-site SB-51-9' 9 7/13/2010 0.5 U 5 U 25 UOn-site SB-52-1' 1 7/12/2010 0.5 U 5 U 25 UOn-site SB-52-3' 3 7/12/2010 0.5 U 5 U 25 UOn-site SB-52-6' 6 7/12/2010 0.5 U 5 U 25 UOn-site SB-52-9' 9 7/12/2010 0.5 U 5 U 25 UOn-site SB-53-0.5' 0.5 7/12/2010 0.5 U 410 1300On-site SB-53-3' 3 7/13/2010 0.5 U 1000 3700On-site SB-53-6' 6 7/13/2010 0.5 U 850 2200On-site SB-53-9' 9 7/13/2010 0.5 U 8.8 70On-site SB-54-1' 1 7/12/2010 0.5 U 5 U 25 UOn-site SB-54-3' 3 7/12/2010 0.5 U 170 360On-site SB-54-6' 6 7/12/2010 0.5 U 5 U 25 UOn-site SB-54-9' 9 7/12/2010 0.5 U 160 410On-site SB-55-1.5' 1.5 7/13/2010 0.5 U 5 U 41On-site SB-55-3' 3 7/13/2010 0.5 U 5 U 25 UOn-site SB-55-6' 6 7/13/2010 0.5 U 5 U 25 UOn-site SB-55-9' 9 7/13/2010 0.5 U 5 U 25 UOn-site SB-56-0.5' 0.5 7/14/2010 0.5 U 740 1400On-site SB-56-3' 3 7/14/2010 0.5 U 8 50On-site SB-56-6' 6 7/14/2010 0.5 U 5 U 25 UOn-site SB-56-9' 9 7/14/2010 0.5 U 5 U 25 UOn-site SB-62-0 0 9/22/2010 0.2 6500 14000On-site SB-62-5 5 9/22/2010 0.18 460 920On-site SB-62-10 10 9/22/2010 0.047 5 U 25 UOn-site SB-63-1 1 9/23/2010 0.11 810 2400On-site SB-63-5 5 9/23/2010 0.016 U 5 U 25 UOn-site SB-63-10 10 9/23/2010 0.016 6.5 25 UOn-site SB-64-1 1 9/22/2010 0.018 570 1600On-site SB-64-5 5 9/22/2010 0.015 U 940 3300On-site SB-64-10 10 9/22/2010 0.013 U 5 U 25 UOn-site SB-65-1 1 9/23/2010 0.013 U 5 U 25 UOn-site SB-65-5 5 9/23/2010 0.025 570 2100On-site SB-65-10 10 9/23/2010 0.013 U 6 25 UOn-site SB-66-0 0 9/23/2010 0.028 15 28On-site SB-66-5 5 9/23/2010 0.013 5 U 25 UOn-site SB-66-10 10 9/23/2010 0.011 U 5 U 25 UOn-site SB-67-0 0 9/23/2010 0.12 24 100On-site SB-67-5 5 9/23/2010 0.044 5 U 25 UOn-site SB-67-10 10 9/23/2010 0.013 U 5 U 25 U




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On-site SB-68-0 0 9/23/2010 0.073 4300 7300On-site SB-68-5 5 9/23/2010 0.026 5 U 25 UOn-site SB-68-10 10 9/23/2010 0.025 5 U 25 UOn-site SB-69-0 0 9/23/2010 11 350 1200On-site SB-69-5 5 9/23/2010 0.016 5 U 25 UOn-site SB-69-10 10 9/23/2010 0.015 U 5 U 25 UOn-site SS-1 0 2/24/2006 1 U 700 1000On-site SS-2 0 2/24/2006 1 U 420 570On-site SS-3 0 2/24/2006 1 U 4900 7700On-site SS-4 0 2/24/2006 1 U 210 250On-site SS-5 0 2/24/2006 1 U 280 380On-site SS-6 0 2/24/2006 1 U 16 19On-site SS-7 0 2/24/2006 1 U 2200 3700On-site SS-8 0 2/24/2006 1 U 1700 2900On-site SS-9 0 2/24/2006 1 U 910 1300On-site TP-1-0.5' 0.5 7/12/2010 0.5 U 5.8 26On-site TP-1-3' 3 7/12/2010 0.5 U 5 U 25 UOn-site TP-1-6' 6 7/12/2010 0.5 U 5 U 25 UOn-site TP-2-0.5' 0.5 7/12/2010 0.5 U 42 110On-site TP-2-3' 3 7/12/2010 0.5 U 5 U 25 UOn-site TP-2-6' 6 7/12/2010 0.5 U 5 U 25 UOn-site TP-2-9' 9 7/12/2010 0.5 U 5 U 25 UOn-site TP-3-0.5' 0.5 7/12/2010 0.5 U 410 880On-site TP-3-3' 3 7/12/2010 0.5 U 27 68On-site TP-3-6' 6 7/12/2010 0.5 U 18 45On-site TP-4-0.5' 0.5 7/12/2010 0.5 U 5 U 25 UOn-site TP-4-3' 3 7/12/2010 0.5 U 5 U 25 UOn-site TP-4-6' 6 7/12/2010 0.5 U 5 U 25 UOn-site TP-5-0.5' 0.5 7/13/2010 0.5 U 5 U 25 UOn-site TP-5-3' 3 7/13/2010 0.5 U 5 U 25 UOn-site TP-5-6' 6 7/13/2010 0.5 U 5 U 25 UOn-site TP-6-0.5' 0.5 7/13/2010 0.5 U 72 170On-site TP-6-3' 3 7/13/2010 0.5 U 5 U 25 UOn-site TP-6-6' 6 7/13/2010 0.5 U 5 U 25 UOn-site TP-7-25S 1.17 7/12/2010 0.5 U 70 130On-site TP-7-25D 2.67 7/12/2010 0.5 U 5.5 25 UOn-site TP-7-40S 1.17 7/12/2010 0.5 U 7.8 25 UOn-site TP-7-40D 2.67 7/12/2010 0.5 U 5 U 25 UOn-site TP-8-0.5' 0.5 7/13/2010 0.5 U 520 1500On-site TP-8-3' 3 7/13/2010 0.5 U 55 150On-site TP-8-6' 6 7/13/2010 0.5 U 5 U 25 UOn-site TP-9-0.5' 0.5 7/13/2010 0.5 U 490 1400On-site TP-9-3' 3 7/13/2010 0.5 U 82 230




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On-site TP-9-6' 6 7/13/2010 0.5 U 5 U 25 UOn-site TP-9-9' 9 7/13/2010 0.5 U 22 45On-site TP-10-0.5' 0.5 7/13/2010 0.5 U 5 U 25 UOn-site TP-10-3' 3 7/13/2010 0.5 U 70 190On-site TP-10-6' 6 7/13/2010 0.5 U 5 U 25 UOn-site TP-11-0.5' 0.5 7/13/2010 0.5 U 700 1600On-site TP-11-3' 3 7/13/2010 0.5 U 340 940On-site TP-11-6' 6 7/13/2010 0.5 U 40 99On-site TP-11-9' 9 7/13/2010 0.5 U 19 44

LIW Property SB-35-0' 0 11/9/2009 0.5 U 110 280LIW Property SB-35-3' 3 11/9/2009 0.5 U 5 U 25 ULIW Property SB-35-6' 6 11/9/2009 0.5 U 5 U 25 ULIW Property SB-35-9' 9 11/9/2009 0.5 U 5 U 25 ULIW Property SB-36-0' 0 11/9/2009 0.5 U 50 49LIW Property SB-36-3' 3 11/9/2009 0.5 U 5.4 25 ULIW Property SB-36-6' 6 11/9/2009 0.5 U 5 U 25 ULIW Property SB-36-9' 9 11/9/2009 0.5 U 5 U 25 ULIW Property SB-37-0' 0 11/9/2009 0.5 U 140 100LIW Property SB-37-3' 3 11/9/2009 0.5 U 43 130LIW Property SB-37-6' 6 11/9/2009 0.5 U 5 U 25 ULIW Property SB-37-9' 9 11/9/2009 0.5 U 5 U 25 ULIW Property SB-38-0' 0 11/9/2009 0.5 U 110 130LIW Property SB-38-3' 3 11/9/2009 0.5 U 7.8 25 ULIW Property SB-38-6' 6 11/9/2009 0.5 U 5 U 25 ULIW Property SB-38-9' 9 11/9/2009 0.5 U 5 U 25 ULIW Property SB-39-0' 0 11/9/2009 0.5 U 48 25 ULIW Property SB-39-3' 3 11/9/2009 0.5 U 5 U 25 ULIW Property SB-39-6' 6 11/9/2009 0.5 U 5 U 25 ULIW Property SB-39-9' 9 11/9/2009 0.5 U 5 U 25 ULIW Property SB-39-9' (DUP-6) 9 11/9/2009 0.5 U 5 U 25 ULIW Property SB-40-0' 0 11/10/2009 0.5 U 50 160LIW Property SB-40-3' 3 11/10/2009 0.5 U 190 360LIW Property SB-40-6' 6 11/10/2009 0.5 U 11 25 ULIW Property SB-40-9' 9 11/10/2009 0.5 U 6.7 25 ULIW Property SB-41-0' 0 11/10/2009 0.5 U 410 1400LIW Property SB-41-3' 3 11/10/2009 0.5 U 5 U 25 ULIW Property SB-41-6' 6 11/10/2009 0.5 U 5 U 25 ULIW Property SB-41-9' 9 11/10/2009 0.5 U 5 U 25 ULIW Property SB-42-0' 0 11/10/2009 0.5 U 15 25 ULIW Property SB-42-3' 3 11/10/2009 0.5 U 5 U 25 ULIW Property SB-42-6' 6 11/10/2009 0.5 U 5 U 25 ULIW Property SB-42-9' 9 11/10/2009 0.5 U 5 U 25 ULIW Property SB-43-0' 0 11/10/2009 0.5 U 220 620




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LIW Property SB-43-3' 3 11/10/2009 0.5 U 5 U 25 ULIW Property SB-43-6' 6 11/10/2009 0.5 U 5 U 25 ULIW Property SB-43-9' 9 11/10/2009 0.5 U 8.1 25 ULIW Property SB-44-0' 0 11/10/2009 0.5 U 83 83LIW Property SB-44-3' 3 11/10/2009 0.93 46 80LIW Property SB-44-6' 6 11/10/2009 0.5 U 5 U 25 ULIW Property SB-44-9' 9 11/10/2009 0.5 U 5 U 25 ULIW Property SB-45-0' 0 11/10/2009 0.5 U 130 37LIW Property SB-45-3' 3 11/10/2009 0.5 U 6.5 25 ULIW Property SB-45-6' 6 11/10/2009 0.5 U 5 U 25 ULIW Property SB-45-9' 9 11/10/2009 0.5 U 5 U 25 ULIW Property SB-46-0' 0 11/10/2009 0.5 U 58 150LIW Property SB-46-3' 3 11/10/2009 0.5 U 5 U 25 ULIW Property SB-46-6' 6 11/10/2009 0.5 U 5 U 25 ULIW Property SB-46-9' 9 11/10/2009 0.5 U 5 U 25 UOff-site ROW SB-3-0' 0 10/14/2008 0.5 U 200 J 710Off-site ROW SB-3-3' 3 10/14/2008 0.5 U 200 J 950Off-site ROW SB-3-6' 6 10/14/2008 0.5 U 90 J 500Off-site ROW SB-3-9' 9 10/14/2008 0.5 U 5 U 25 UOff-site ROW SB-3-9' (DUP-3) 9 10/14/2008 0.5 U 5 U 25 UOff-site ROW SB-4-0' 0 10/14/2008 0.5 U 980 J 4600Off-site ROW SB-4-3' 3 10/14/2008 0.5 U 58 J 210Off-site ROW SB-4-6' 6 10/14/2008 0.5 U 1100 J 4000Off-site ROW SB-4-7' 7 10/14/2008 0.5 U 220 930Off-site ROW SB-4-9' 9 10/14/2008 0.5 U 5 U 30Off-site ROW SB-11-0' 0 10/14/2008 0.5 U 390 J 1500Off-site ROW SB-11-3' 3 10/14/2008 0.5 U 5 U 27Off-site ROW SB-11-6' 6 10/14/2008 0.5 U 6.5 25 UOff-site ROW SB-11-9' 9 10/14/2008 0.5 U 5 U 25 UOff-site ROW SB-12-0' 0 10/14/2008 0.5 U 540 J 1600Off-site ROW SB-12-1.5' 1.5 10/14/2008 0.5 U 5 U 25 UOff-site ROW SB-12-3' 3 10/14/2008 0.5 U 2400 J 8600Off-site ROW SB-12-6' 6 10/14/2008 0.5 U 1300 J 7400Off-site ROW SB-12-9' 9 10/14/2008 0.5 U 120 J 290Off-site ROW SB-26-0.5' 0.5 11/5/2009 0.5 U 210 680Off-site ROW SB-26-5' 5 11/5/2009 0.5 U 6 25 UOff-site ROW SB-27-0.5' 0.5 11/5/2009 0.5 U 26 73Off-site ROW SB-27-5' 5 11/5/2009 0.5 U 7 25 UOff-site ROW SB-27-10' (DUP-5) 10 11/5/2009 0.5 U 5 U 25 UOff-site ROW SB-28-0.5' 0.5 11/5/2009 0.5 U 5 U 25 UOff-site ROW SB-28-8' 8 11/5/2009 0.5 U 5 U 25 UOff-site ROW SB-29-0.5' 0.5 11/4/2009 0.5 U 7.4 25 UOff-site ROW SB-29-5' 5 11/4/2009 0.5 U 5 U 25 U




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Off-site ROW SB-29-10' 10 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-30-0.5' 0.5 11/4/2009 0.5 U 15 41Off-site ROW SB-30-5' 5 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-30-5' (DUP-3) 5 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-30-10' 10 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-31-0.5' 0.5 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-31-5' 5 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-31-10' 10 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-32-0.5' 0.5 11/4/2009 0.5 U 22 50Off-site ROW SB-32-5' 5 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-32-10' 10 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-33-0.5' 0.5 11/4/2009 0.5 U 2200 5100Off-site ROW SB-33-5' 5 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-33-10' 10 11/4/2009 0.5 U 5 U 25 UOff-site ROW SB-47-0.5' 0.5 7/15/2010 0.5 U 620 1400Off-site ROW SB-47-3' 3 7/15/2010 0.5 U 25 100Off-site ROW SB-47-6' 6 7/15/2010 0.5 U 5 U 25 UOff-site ROW SB-58-0 0 9/22/2010 0.02 770 2800Off-site ROW SB-58-5 5 9/22/2010 0.017 U 5 U 25 UOff-site ROW SB-58-10 10 9/22/2010 0.012 U 5 U 25 UOff-site ROW SB-59-3 3 9/22/2010 0.15 15000 35000Off-site ROW SB-59-5 5 9/22/2010 0.015 U 5 U 25 UOff-site ROW SB-59-10 10 9/22/2010 0.019 U 5 U 25 UOff-site ROW SB-60-0 0 9/22/2010 0.018 270 810Off-site ROW SB-60-5 5 9/22/2010 0.01 U 13 83Off-site ROW SB-60-10 10 9/22/2010 0.013 5 U 25 UOff-site ROW SB-61-0 0 9/22/2010 0.025 27 96Off-site ROW SB-61-5 5 9/22/2010 0.013 U 5 U 25 UOff-site ROW SB-61-10 10 9/22/2010 0.017 U 5 U 25 U

Notes:Samples SHADED GRAY are included in the exposed soils (0-0.5 feet bgs) dataset.All analytical results are presented in milligrams per kilogram (mg/kg).-- = not analyzed for. bgs = below ground surfaceDUP = field duplicate sample.LIW = Lodi Iron WorksROW = right-of-wayTPH = total petroleum hydrocarbonJ = Estimated value.U = Indicates constituent not detected at concentration equal to or greater than the specified reporting limit.


Modified ASTM D-1946

(%)

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SG-1S 5 7/15/2009 1.7 11 52 311 1.4 <1.6 3.2 68 <4.4 <1.0UJ 5.3 <1.2 <1.5 2.1 <5.8 <1.2 5.8 21 160 66 140 <3.8 <7.5 0.38SG-1D 8 7/15/2009 2.2 13 71 459 <2.1 <2.4 <4.0 78 <6.7 <1.5 3.9 <1.8 <2.3 3.9 <8.8 5.0 8.0 28 220 91 210 <5.8 <11 NASG-2S 5 7/14/2009 <12 3400 250 1340 <19 <21 <36 150 <59 <14UJ <11 <16 <20 <26 <78 <16 19 <19 70 41 120 <52 <100 NASG-2D 8 7/14/2009 <34 8000 690 3490 <53 <60 <81 260 <33 <38 <32 <44 <58 <72 <180 <46 <52 <53 91 69 160 <120 <220 NASG-3S 5 7/14/2009 <3.0 120 28 188 <4.6 <5.2 <8.8 71 <14 <3.4UJ <2.8 <3.8 <5.0 <6.3 <19 <4.0 10 31 210 60 170 <13 <24 NA

DUP-1 (SG-3S) 5 7/14/2009 1.4 120 30 200 1.0 1.3 <1.6 85 <2.7 <0.63UJ 3.2 1.0 2.1 3.5 <3.6 <0.74 11 32 210 60 180 <2.4 23 NASG-3D 8 7/15/2009 1.3 36 23 134 <0.97 1.4 <1.8 18 <3.0 <0.71UJ 2.6 1.7 <1.0 9.0 4.2 <0.83 10 48 310 88 240 <2.6 15 NASG-4S 5 7/14/2009 4.6 6.9 40 252 <1.5 1.8 <2.9 82 34 <1.1UJ 4.0 <1.2 6.2 2.6 <6.2 <1.3 22 12 83 29 59 <4.1 <8.0 NASG-4D 8 7/14/2009 7.5 9.9 42 250 <8.2 <9.4 <16 210 <26 <6.0UJ 7.8 <6.8 <9.0 <11 <34 <7.1 27 10 72 26 45 <22 <44 NASG-5S 5 7/16/2009 <2.7 36 3.7 26.3 <4.2 <4.7 <7.9 180 <13 <3.0 4.4 <3.4 <4.5 <5.7 <17 <3.6 5.6 9.6 66 26 66 <11 <22 NASG-5D 8 7/16/2009 <2.8 51 <3.9 19.8 <4.4 <5.0 16 250 <14 <3.2 8.1 <3.7 <4.8 <6.1 <18 <3.8 <4.4 16 110 50 120 5.1J <23 ND<0SG-6S 5 7/16/2009 <2.8 570 37 182 <4.3 <4.9 <8.2 28 <14 <3.2 4.0 7.6 <4.7 <5.9 <18 <3.7 <4.3 <4.3 7.8 <4.3 11 <12 <23 NA

DUP-2 (SG-6S) 5 7/16/2009 <2.7 480 33 171 <4.2 <4.8 <8.0 26 <13 <3.1 3.9 6.8 <4.6 <5.8 <18 <3.6 <4.2 <4.2 8.0 <4.2 11 <12 <22 NASG-6S (LAB DUP) -- -- <5.6 560 32 158 <8.6 <9.8 <16 30 <27 <6.3 <5.2 7.5 <9.4 <12 <36 <7.4 <8.6 <8.6 <8.6 <8.6 11 <24 <46 NA

SG-6D 8 7/16/2009 <5.4 1000 69 340 <8.3 <9.4 <16 60 <26 <6.0 6.9 13 <9.0 <11 <34 <7.2 <8.2 <8.2 12 <8.2 16 <23 <44 NAEB-1 -- 7/16/2009 <3.0 3.6 <4.1 <4.1 <4.7 <5.4 <9.0 300 <15 <3.4 4.2 <3.9 <5.1 <6.5 <20 <4.1 <4.7 <4.7 <4.7 <4.7 <4.7 <13 <25 NA

Notes:Only analytes detected above the method reporting limit are shownBold value denotes values that exceed the method detection or reporting limit.µg/m3 - micrograms per cubic meterbgs - below ground surfaceDUP - Duplicate sample% - percent< - Indicates constituent not detected at concentration equal to or greater than the specified reporting limit.J - Estimated value; concentration is above the method detection limit, but below the method reporting limit.UJ - Non-detected compound associated with low bias in the continuing calibration verification (CCV).

TABLE A-5ANALYTICAL DATA INCLUDED IN THE HRA - SOIL GAS


VOLATILE ORGANIC COMPOUNDS

Method Modified TO-15 Low Level

(µg/m3)

Sample NameSample Depth

(feet bgs) Sample Date

Att_A_Tables_Lodi 1 of 1 IRIS ENVIRONMENTAL


IRIS ENVIRONMENTAL

ATTACHMENT B

DETERMINATION OF AMBIENT ARSENIC CONCENTRATIONS


B-1 IRIS ENVIRONMENTAL

ATTACHMENT B

DETERMINATION OF AMBIENT ARSENIC CONCENTRATIONS

B.1 Introduction

As indicated in the human health risk assessment (HRA) for the Former Lodi Manufactured Gas Plant Site (the “Site”), Cal/EPA guidance calls for the exclusion of inorganic chemicals from the quantitative risk assessment if they are detected at levels within the local background/ambient concentrations. As ambient soil concentrations of arsenic commonly exceed concentrations corresponding to incremental cancer risks of 10-

6 to 10-4, a more detailed Site-wide determination of ambient levels for arsenic was conducted. The Site-wide ambient determination for arsenic was conducted following the approach put forth by the California Environmental Protection Agency (Cal/EPA 1997, 2009) to determine whether arsenic in Site soils should be considered a COPC in the HRA. The approach and conclusions of the evaluation are summarized below.

B.2 Evaluation of Arsenic

The approach set forth by Cal/EPA (1997, 2009) evaluates whether the data distributions reflect single normal or lognormal populations, or contain multiple populations that would indicate contamination in addition to ambient levels. Cal/EPA recommends a “weight-of-evidence” approach where three indicators of local background/ambient exceedance are considered. The three indicators include: (1) the degree to which the site data distributions are fit by a normal or lognormal distribution; (2) a graphical assessment (probability plot against the normal or lognormal distribution) to identify breaks or nonlinearity indicative of more than a single population; and (3) the skewness of the data as indicated by the coefficient of variation (CV = standard deviation/average) and the data range (order of magnitude difference between the maximum and minimum concentrations). The arsenic dataset used herein for the ambient determination includes all arsenic data. Samples were collected from on-site (i.e., sampling locations within the Site boundaries, within the adjacent right-of-way to the west of the Site, and in the adjacent Lodi Iron Works property south of the Site) as well as from off-site (i.e., local background sampling locations). This arsenic data set is summarized in Table B-1.

B.2.1 Data Distributions

The distribution of the arsenic data set was tested using the Lilliefors test for normality to evaluate whether the data population was normally or lognormally distributed (Gilbert 1987). The test was performed on both raw and log-transformed data sets. The results of the Lilliefors test for normality are provided in Exhibit A. At the 95% confidence level, the data population of the entire dataset appears to be lognormally distributed. Therefore, the arsenic dataset was treated as distributed lognormally for the purposes of graphical and statistical assessments discussed below.



B.2.2 Graphical Assessment

A visual review of the cumulative probability plots for log-transformed arsenic dataset (presented in Exhibit B) indicates a generally smooth line for the data without obvious inflection points in the distribution; this implies a single population of arsenic at the Site. Furthermore, the box plot for the log-transformed arsenic dataset does not indicate any potential outliers in the upper end of the distribution (Exhibit C) and the Rosner outlier test did not detected any outliers at the 1% or 5% significance level (Exhibit D). The visual evidence of the cumulative probability plots, along with the results of the outlier test, support that the Site arsenic data comprises a single population.

B.2.3 Summary Statistics

As indicated in Table B-2, the log-transformed arsenic dataset consists of 228 samples ranging in concentration of -0.12 milligrams per kilogram (mg/kg; 0.75 mg/kg in non-transformed scale) up to 1.1 mg/kg (12 mg/kg in non-transformed scale), with a mean of 0.37 mg/kg (2.3 mg/kg in non-transformed scale) 1.

Typically, data drawn from just one population will display a range of detected values of no more than 2 orders of magnitude and a coefficient of variation no greater than 1. As shown in Table B-2, based on these criteria, both the range of detected values and coefficient of variation for the raw dataset suggest that the arsenic dataset is comprised of one population.

B.2 Conclusions

Based on the results presented above, arsenic present at the Site appears to be representative of local ambient concentrations, and is therefore excluded as a COPC in the HRA.

B.4 References Cal/EPA. 2009. Arsenic Strategies, Determination of Arsenic Remediation,

Development of Arsenic Cleanup Goals. Department of Toxic Substances Control. January 16.

Cal/EPA. 1997. Selecting Inorganic Constituents as Chemicals of Potential Concern at

Risk Assessment at Hazardous Waste Sites and Permitted Facilities. Department of Toxic Substances Control. February.

1 Note that only 4 out of 228 samples contained arsenic concentrations greater than 10 mg/kg (i.e., SB-30-13' [11.6 mg/kg], SB-31-15' [11.6 mg/kg], SB-33-10' [12 mg/kg], and SB-46-0' [10.4 mg/kg]). Three of these samples were collected at depths of 10 feet below ground surface (bgs) or greater within the adjacent right-of-way to the west of the Site, and the remaining sample was collect at surface from the adjacent Lodi Iron Works property south of the Site. Further, polycyclic aromatic hydrocarbons (PAHs), total petroleum hydrocarbons (TPHs), and benzene, toluene, ethylbenzene, and xylenes (BTEX) were not detected above laboratory reporting limits in any of these four samples.



Gilbert, R.O. 1987. Statistical Methods for Environmental Pollution Monitoring. New

York: Van Nostrand Reinhold.


IRIS ENVIRONMENTAL

ATTACHMENT B

TABLES

TABLE B-1SUMMARY OF ARSENIC DATASETFormer Lodi Manufactured Gas Plant

Lodi, California

Area 1 Sample ID Sample Date Sample Depth 2

On-site AK-1-30" 7/15/2010 2.5 0.795 -0.10On-site AK-1-38" 7/15/2010 3.17 0.956 -0.020On-site AK-2-20" 7/15/2010 1.7 0.75 U -0.12 UOn-site AK-2-34" 7/15/2010 2.83 0.926 -0.033On-site AK-3-17" 7/15/2010 1.42 1.23 0.090On-site SB-1-0' 10/15/2008 0 2.18 0.34On-site SB-1-3' 10/15/2008 3 0.75 U -0.12 UOn-site SB-1-6' 10/15/2008 6 0.75 U -0.12 UOn-site SB-1-9' 10/15/2008 9 6.03 0.78On-site SB-2-0' 10/15/2008 0 0.807 -0.093On-site SB-2-3' 10/15/2008 3 1.19 0.076On-site SB-2-6' 10/15/2008 6 0.904 -0.044On-site SB-2-9' 10/15/2008 9 1.97 0.29On-site SB-3-0' 10/14/2008 0 0.75 U -0.12 UOn-site SB-3-3' 10/14/2008 3 1.48 0.17On-site SB-3-6' 10/14/2008 6 1.27 0.10On-site SB-3-9' 10/14/2008 9 2.08 0.32On-site SB-4-0' 10/14/2008 0 1.17 0.068On-site SB-4-3' 10/14/2008 3 1.29 0.11On-site SB-4-6' 10/14/2008 6 1.23 0.090On-site SB-4-7' 10/14/2008 7 2.19 0.34On-site SB-4-9' 10/14/2008 9 0.75 U -0.12 UOn-site SB-5-0' 10/15/2008 0 5.36 0.73On-site SB-5-6' 10/15/2008 6 1.83 0.26On-site SB-5-9' 10/15/2008 9 1.39 0.14On-site SB-6-7.5' 10/14/2008 7.5 0.858 -0.067On-site SB-6-9.5' 10/14/2008 9.5 0.75 U -0.12 UOn-site SB-6-12.5' 10/14/2008 12.5 1.18 0.072On-site SB-7-0' 10/15/2008 0 2.37 0.37On-site SB-7-3' 10/15/2008 3 1.91 0.28On-site SB-7-6' 10/15/2008 6 2.33 0.37On-site SB-7-9' 10/15/2008 9 6.79 0.83On-site SB-8-0' 10/15/2008 0 0.75 U -0.12 UOn-site SB-8-3' 10/15/2008 3 0.75 U -0.12 UOn-site SB-8-5.5' 10/15/2008 5.5 5.66 0.75On-site SB-8-6' 10/15/2008 6 0.75 U -0.12 UOn-site SB-8-9' 10/15/2008 9 5.43 0.73On-site SB-9-0' 10/13/2008 0 3.49 0.54On-site SB-9-3' 10/13/2008 3 1.97 0.29On-site SB-9-6' 10/13/2008 6 1.93 0.29On-site SB-9-9' 10/13/2008 9 2.29 0.36On-site SB-10-1.5' 10/15/2008 1.5 1.21 0.083On-site SB-10-3' 10/15/2008 3 1.03 0.013On-site SB-10-6' 10/15/2008 6 1.15 0.061On-site SB-10-9' 10/15/2008 9 4.92 0.69On-site SB-11-0' 10/14/2008 0 1.29 0.11On-site SB-11-3' 10/14/2008 3 1.9 0.28

RawArsenic

(mg/kg) 3

Log-Transformed

Arsenic(mg/kg) 3

Attachment Arsenic Bkgd Determination Page 1 of 7 IRIS ENVIRONMENTAL


Lodi, California


RawArsenic

(mg/kg) 3

Log-Transformed

Arsenic(mg/kg) 3

On-site SB-11-6' 10/14/2008 6 2.04 0.31On-site SB-11-9' 10/14/2008 9 0.893 -0.049On-site SB-11-15' 10/14/2008 15 1.86 0.27On-site SB-12-0' 10/14/2008 0 1.38 0.14On-site SB-12-1.5' 10/14/2008 1.5 1.94 0.29On-site SB-12-3' 10/14/2008 3 2.82 0.45On-site SB-12-6' 10/14/2008 6 1.75 0.24On-site SB-12-9' 10/14/2008 9 1.5 0.18On-site SB-12-12' 10/14/2008 12 1.6 0.20On-site SB-12-15' 10/14/2008 15 4.11 0.61On-site SB-13-0' 10/13/2008 0 3.61 0.56On-site SB-13-3' 10/13/2008 3 1.75 0.24On-site SB-13-6' 10/13/2008 6 1.55 0.19On-site SB-13-9' 10/13/2008 9 2.42 0.38On-site SB-14-0' 10/13/2008 0 3.07 0.49On-site SB-14-2' 10/13/2008 2 2.3 0.36On-site SB-14-3' 10/13/2008 3 2.26 0.35On-site SB-14-6' 10/13/2008 6 2.26 0.35On-site SB-14-9' 10/13/2008 9 2.21 0.34On-site SB-15-0' 10/13/2008 0 2.31 0.36On-site SB-15-3' 10/13/2008 3 2.07 0.32On-site SB-15-6' 10/13/2008 6 2.63 0.42On-site SB-15-9' 10/13/2008 9 0.935 -0.029On-site SB-16-1' 10/13/2008 1 2.31 0.36On-site SB-16-3' 10/13/2008 3 0.923 -0.035On-site SB-16-6' 10/13/2008 6 2.63 0.42On-site SB-16-9' 10/13/2008 9 4.1 0.61On-site SB-17-1' 11/5/2009 1 5.04 0.70On-site SB-17-18' 11/6/2009 18 5.18 0.71On-site SB-17-20.5' 11/6/2009 20.5 1.7 0.23On-site SB-17-25.5' 11/6/2009 25.5 1.61 0.21On-site SB-18-0' 11/4/2009 0 2.8 0.45On-site SB-18-8' 11/4/2009 8 3.54 0.55On-site SB-18-16' 11/4/2009 16 8.67 0.94On-site SB-18-26' 11/4/2009 26 5.54 0.74On-site SB-18-65' 11/4/2009 65 3.08 0.49On-site SB-19-5' 11/5/2009 5 2.68 0.43On-site SB-19-15.5 11/5/2009 15.5 8.47 0.93On-site SB-19-21' 11/5/2009 21 2.34 0.37On-site SB-19-28' 11/5/2009 28 2.19 0.34On-site SB-20-0' 11/4/2009 0 2.9 0.46On-site SB-20-14' 11/5/2009 14 6.42 0.81On-site SB-20-20' 11/5/2009 20 2.46 0.39On-site SB-20-66.5' 11/5/2009 66.5 5.73 0.76On-site SB-21-0' 11/3/2009 0 8.46 0.93On-site SB-21-5' 11/2/2009 5 2.85 0.45On-site SB-21-10' 11/2/2009 10 4.54 0.66



Lodi, California


RawArsenic

(mg/kg) 3

Log-Transformed

Arsenic(mg/kg) 3

On-site SB-22-0' 11/2/2009 0 2.88 0.46On-site SB-22-5' 11/2/2009 5 2.7 0.43On-site SB-22-10' 11/2/2009 10 6.09 0.78On-site SB-23-0' 11/2/2009 0 7.16 0.85On-site SB-23-10' 11/2/2009 10 4.48 0.65On-site SB-23-12' 11/2/2009 12 4.75 0.68On-site SB-23-15' 11/2/2009 15 1.41 0.15On-site SB-24-0' 11/2/2009 0 2.45 0.39On-site SB-24-5' 11/2/2009 5 3.59 0.56On-site SB-24-10' 11/2/2009 10 5.73 0.76On-site SB-25-0' 11/2/2009 0 4.56 0.66On-site SB-25-10' 11/2/2009 10 2.53 0.40On-site SB-25-5' 11/2/2009 5 3.72 0.57On-site SB-26-0.5' 11/5/2009 0.5 1.41 0.15On-site SB-26-5' 11/5/2009 5 2.32 0.37On-site SB-26-15' 11/5/2009 15 8.82 0.95On-site SB-27-0.5' 11/5/2009 0.5 1.92 0.28On-site SB-27-5' 11/5/2009 5 1.42 0.15On-site SB-27-10' (DUP-5) 11/5/2009 10 1.42 0.15On-site SB-27-15' 11/5/2009 15 4.92 0.69On-site SB-28-0.5' 11/5/2009 0.5 1.39 0.14On-site SB-28-8' 11/5/2009 8 2.82 0.45On-site SB-28-15' 11/5/2009 15 3.48 0.54On-site SB-29-0.5' 11/4/2009 0.5 2.07 0.32On-site SB-29-5' 11/4/2009 5 2.42 0.38On-site SB-29-10' 11/4/2009 10 1.72 0.24On-site SB-29-13' 11/4/2009 13 2.76 0.44On-site SB-30-0.5' 11/4/2009 0.5 1.78 0.25On-site SB-30-5' 11/4/2009 5 3.06 0.49On-site SB-30-10' 11/4/2009 10 3.83 0.58On-site SB-30-13' 11/4/2009 13 11.6 1.06On-site SB-31-0.5' 11/4/2009 0.5 1.89 0.28On-site SB-31-5' 11/4/2009 5 2.64 0.42On-site SB-31-10' 11/4/2009 10 3.13 0.50On-site SB-31-15' 11/4/2009 15 11.6 1.06On-site SB-32-0.5' 11/4/2009 0.5 1.44 0.16On-site SB-32-5' 11/4/2009 5 3.28 0.52On-site SB-32-10' 11/4/2009 10 6.6 0.82On-site SB-32-15' 11/4/2009 15 4.06 0.61On-site SB-33-0.5' 11/4/2009 0.5 3.72 0.57On-site SB-33-5' 11/4/2009 5 3.35 0.53On-site SB-33-10' 11/4/2009 10 12 1.08On-site SB-33-15' 11/4/2009 15 3.79 0.58On-site SB-34-0' 11/3/2009 0 4.51 0.65On-site SB-34-8' 11/3/2009 8 2.87 0.46On-site SB-34-12' 11/3/2009 12 1.75 0.24On-site SB-35-0' 11/9/2009 0 3.27 0.51



Lodi, California


RawArsenic

(mg/kg) 3

Log-Transformed

Arsenic(mg/kg) 3

On-site SB-35-3' 11/9/2009 3 3 0.48On-site SB-35-6' 11/9/2009 6 3.93 0.59On-site SB-35-9' 11/9/2009 9 4.86 0.69On-site SB-36-0' 11/9/2009 0 3.76 0.58On-site SB-36-3' 11/9/2009 3 4.36 0.64On-site SB-36-6' 11/9/2009 6 3.21 0.51On-site SB-36-9' 11/9/2009 9 4.34 0.64On-site SB-37-0' 11/9/2009 0 1.43 0.16On-site SB-37-3' 11/9/2009 3 3.14 0.50On-site SB-37-6' 11/9/2009 6 4.47 0.65On-site SB-37-9' 11/9/2009 9 4.17 0.62On-site SB-38-0' 11/9/2009 0 6.35 0.80On-site SB-38-3' 11/9/2009 3 3.71 0.57On-site SB-38-6' 11/9/2009 6 4.42 0.65On-site SB-38-9' 11/9/2009 9 2.94 0.47On-site SB-39-0' 11/9/2009 0 3.14 0.50On-site SB-39-3' 11/9/2009 3 2.95 0.47On-site SB-39-6' 11/9/2009 6 3.79 0.58On-site SB-39-9' 11/9/2009 9 3.01 0.48On-site SB-40-0' 11/10/2009 0 3.93 0.59On-site SB-40-3' 11/10/2009 3 2.74 0.44On-site SB-40-6' 11/10/2009 6 2.53 0.40On-site SB-40-9' 11/10/2009 9 2.41 0.38On-site SB-41-0' 11/10/2009 0 1.87 0.27On-site SB-41-3' 11/10/2009 3 4.31 0.63On-site SB-41-6' 11/10/2009 6 3.37 0.53On-site SB-41-9' 11/10/2009 9 2.84 0.45On-site SB-42-0' 11/10/2009 0 1.99 0.30On-site SB-42-3' 11/10/2009 3 2.7 0.43On-site SB-42-6' 11/10/2009 6 5.75 0.76On-site SB-42-9' 11/10/2009 9 3.12 0.49On-site SB-43-0' 11/10/2009 0 2.35 0.37On-site SB-43-3' 11/10/2009 3 2.45 0.39On-site SB-43-6' 11/10/2009 6 2.4 0.38On-site SB-43-9' 11/10/2009 9 4.26 0.63On-site SB-44-0' 11/10/2009 0 3.87 0.59On-site SB-44-3' 11/10/2009 3 3.84 0.58On-site SB-44-6' 11/10/2009 6 4.26 0.63On-site SB-44-9' 11/10/2009 9 1.98 0.30On-site SB-45-0' 11/10/2009 0 1.44 0.16On-site SB-45-3' 11/10/2009 3 3.11 0.49On-site SB-45-6' 11/10/2009 6 1.97 0.29On-site SB-45-9' 11/10/2009 9 2.33 0.37On-site SB-46-0' 11/10/2009 0 10.4 1.02On-site SB-46-3' 11/10/2009 3 2.33 0.37On-site SB-46-6' 11/10/2009 6 3.59 0.56On-site SB-46-9' 11/10/2009 9 1.61 0.21



Lodi, California


RawArsenic

(mg/kg) 3

Log-Transformed

Arsenic(mg/kg) 3

On-site SB-47-0.5' 7/15/2010 0.5 6.93 0.84On-site SB-47-3' 7/15/2010 3 1.03 0.013On-site SB-47-6' 7/15/2010 6 1.59 0.20On-site SB-48-1.5' 7/13/2010 1.5 0.913 -0.04On-site SB-48-3' 7/13/2010 3 1.49 0.17On-site SB-48-6' 7/13/2010 6 2.22 0.35On-site SB-49-3' 7/13/2010 3 1.19 0.08On-site SB-49-4' 7/13/2010 4 1.29 0.11On-site SB-49-6' 7/13/2010 6 1.8 0.26On-site SB-50-1.5' 7/13/2010 1.5 2.1 0.32On-site SB-50-3' 7/13/2010 3 2.8 0.45On-site SB-50-6' 7/13/2010 6 5.03 0.70On-site SB-51-1.5' 7/13/2010 1.5 1.83 0.26On-site SB-51-3' 7/13/2010 3 2.15 0.33On-site SB-51-6.5' 7/13/2010 6.5 1.63 0.21On-site SB-51-9' 7/13/2010 9 3.98 0.60On-site SB-52-1' 7/12/2010 1 1.18 0.072On-site SB-52-3' 7/12/2010 3 2.69 0.43On-site SB-52-6' 7/12/2010 6 2.3 0.36On-site SB-52-9' 7/12/2010 9 4.94 0.69On-site SB-52-15' 7/12/2010 15 1.74 0.24On-site SB-52-20' 7/12/2010 20 3.84 0.58On-site SB-52-24.5' 7/12/2010 24.5 3.18 0.50On-site SB-53-0.5' 7/12/2010 0.5 2.59 0.41On-site SB-53-3' 7/13/2010 3 3.52 0.55On-site SB-53-6' 7/13/2010 6 4.03 0.61On-site SB-53-9' 7/13/2010 9 4.47 0.65On-site SB-53-15' 7/13/2010 15 2.66 0.42On-site SB-53-20.5' 7/13/2010 20.5 2.18 0.34On-site SB-53-25' 7/13/2010 25 3.19 0.50On-site SB-54-1' 7/12/2010 1 2.87 0.46On-site SB-54-3' 7/12/2010 3 2.35 0.37On-site SB-54-6' 7/12/2010 6 2.22 0.35On-site SB-54-9' 7/12/2010 9 3.44 0.54On-site SB-54-15' 7/12/2010 15 3.75 0.57On-site SB-54-20' 7/12/2010 20 5.48 0.74On-site SB-54-22' 7/12/2010 22 1.77 0.25On-site SB-55-1.5' 7/13/2010 1.5 1.46 0.16On-site SB-55-3' 7/13/2010 3 2.32 0.37On-site SB-55-6' 7/13/2010 6 3.23 0.51On-site SB-55-9' 7/13/2010 9 1.06 0.03On-site SB-55-15' 7/13/2010 15 2.63 0.42On-site SB-55-20' 7/13/2010 20 0.984 -0.007On-site SB-55-25' 7/13/2010 25 2.69 0.43On-site SB-56-0.5' 7/14/2010 0.5 2.78 0.44On-site SB-56-3' 7/14/2010 3 1.83 0.26On-site SB-56-6' 7/14/2010 6 4.35 0.64



Lodi, California


RawArsenic

(mg/kg) 3

Log-Transformed

Arsenic(mg/kg) 3

On-site SB-56-9' 7/14/2010 9 3.57 0.55On-site SB-56-15' 7/14/2010 15 2.97 0.47On-site SB-56-20.5' 7/14/2010 20.5 1.19 0.076On-site SB-56-25' 7/14/2010 25 3.25 0.51On-site SB-57-20.5' 7/15/2010 20.5 0.764 -0.12On-site SS-1 2/24/2006 0 2 0.30On-site SS-2 2/24/2006 0 1.3 0.11On-site SS-3 2/24/2006 0 4.7 0.67On-site SS-4 2/24/2006 0 3.7 0.57On-site SS-5 2/24/2006 0 2.8 0.45On-site SS-6 2/24/2006 0 2.5 0.40On-site SS-7 2/24/2006 0 9.2 0.96On-site SS-8 2/24/2006 0 7.5 0.88On-site SS-9 2/24/2006 0 3.2 0.51On-site TP-1-0.5' 7/12/2010 0.5 1.44 0.16On-site TP-1-3' 7/12/2010 3 0.941 -0.026On-site TP-1-6' 7/12/2010 6 0.983 -0.007On-site TP-2-0.5' 7/12/2010 0.5 2.12 0.33On-site TP-2-3' 7/12/2010 3 1.61 0.21On-site TP-2-6' 7/12/2010 6 1.39 0.14On-site TP-2-9' 7/12/2010 9 0.961 -0.017On-site TP-3-0.5' 7/12/2010 0.5 2.07 0.32On-site TP-3-3' 7/12/2010 3 2.08 0.32On-site TP-3-6' 7/12/2010 6 1.55 0.19On-site TP-4-0.5' 7/12/2010 0.5 0.867 -0.062On-site TP-4-3' 7/12/2010 3 1.47 0.17On-site TP-4-6' 7/12/2010 6 1.73 0.24On-site TP-5-0.5' 7/13/2010 0.5 0.988 -0.005On-site TP-5-3' 7/13/2010 3 1.17 0.07On-site TP-5-6' 7/13/2010 6 2.62 0.42On-site TP-6-0.5' 7/13/2010 0.5 4.78 0.68On-site TP-6-3' 7/13/2010 3 1.66 0.22On-site TP-6-6' 7/13/2010 6 1.83 0.26On-site TP-7-25D 7/12/2010 2.67 1.48 0.17On-site TP-7-25S 7/12/2010 1.17 0.75 U -0.12 UOn-site TP-7-40D 7/12/2010 2.67 2.03 0.31On-site TP-7-40S 7/12/2010 1.17 2.56 0.41On-site TP-8-0.5' 7/13/2010 0.5 2.83 0.45On-site TP-8-3' 7/13/2010 3 2.03 0.31On-site TP-8-6' 7/13/2010 6 1.54 0.19On-site TP-9-0.5' 7/13/2010 0.5 3.3 0.52On-site TP-9-3' 7/13/2010 3 2.13 0.33On-site TP-9-6' 7/13/2010 6 2 0.30On-site TP-9-9' 7/13/2010 9 1.1 0.04On-site TP-10-0.5' 7/13/2010 0.5 1.69 0.23On-site TP-10-3' 7/13/2010 3 2.23 0.35On-site TP-10-6' 7/13/2010 6 2.25 0.35



Lodi, California


RawArsenic

(mg/kg) 3

Log-Transformed

Arsenic(mg/kg) 3

On-site TP-11-0.5' 7/13/2010 0.5 1.06 0.03On-site TP-11-3' 7/13/2010 3 1.42 0.15On-site TP-11-6' 7/13/2010 6 1.49 0.17On-site TP-11-9' 7/13/2010 9 1.16 0.06Background PS-1-0' 11/13/2008 0 2.55 0.41Background PS-1-2' 11/13/2008 2 1.88 0.27Background PS-2-0' 11/13/2008 0 3.06 0.49Background PS-2-2' 11/13/2008 2 4.17 0.62Background PS-3-0' 11/13/2008 0 3.71 0.57Background PS-3-2' 11/13/2008 2 2.93 0.47Background PS-4-0' 11/13/2008 0 1.39 0.14Background PS-4-2' 11/13/2008 2 1.58 0.20Background PS-5-0' 11/13/2008 0 1.99 0.30Background PS-5-2' 11/13/2008 2 1.52 0.18Background PS-6-0' 11/13/2008 0 1.94 0.29Background PS-6-2' 11/13/2008 2 1.27 0.10

Notes:mg/kg = milligrams per kilogram

2 Depth from which sample was collected in feet below ground surface.

3 Results flagged with a "U" denote analyte was not detected above the reporting limit.

1 Area where soil sample was collected designated as follows: On-site = within the Site and Lodi Iron Works property boundaries, and in the adjacent right-of-way (South Sacramento Street), and Background = off-site samples collected within close proximity to Site for background purposes.


TABLE B-2DESCRIPTIVE STATISTICS OF LOG-TRANSFORMED

ARSENIC DATASETFormer Lodi Manufactured Gas Plant

Lodi, California

Descriptive Statistic

Full Log-Transformed

DatasetSample Size (n) 298Minimum Concentration -0.12 (0.76)Maximum Concentration 1.1 (12)Mean (µ) 0.37 (2.3)Median 0.37 (2.3)Standard Deviation 0.28Standard Error of the Mean 1 0.016Lower Quartile (Q1) 0.19Upper Quartile (Q3) 0.6Fourth Spread (fs) 0.36Lower Quartile Limit (LQL) -0.35 (0.45)Upper Quartile Limit (UQL) 1.1 (12)Coefficient of Variation 2 0.67Range - Order of Magnitude Difference 2 1.2

Notes:Concentration in units of milligrams per kilogram (mg/kg).1 The standard error of the mean = standard deviation / n.2 Based values from full raw dataset.



IRIS ENVIRONMENTAL

ATTACHMENT B

EXHIBITS

Exhibit ADESCRIPTIVE STATISTICS OF RAW ARSENIC DATASET


0.95

K-S Critical(0.95) Value 0.0528

Data follow Appr. Gamma Distribution at (0.05) Significance Level

A-D Critical (0.95) Value 0.761

K-S Test Statistic 0.0477

Correlation Coefficient R 0.984

A-D Test Statistic 1.274

Data not Normal at (0.05) Significance Level

Gamma Distribution Test Results

Lilliefors Test Statistic 0.129

Lilliefors Critical (0.95) Value 0.0513

Approximate Shapiro Wilk Test Statistic 0.833

Approximate Shapiro Wilk P Value 0

Normal Distribution Test Results


Mean of Log Transformed Data 0.842

Standard Deviation of Log Transformed Data 0.647

Standard Deviation of Raw Data 1.894

Kstar 2.671

Maximum 12

Mean of Raw Data 2.825

Number of Distinct Observations 217

Minimum 0.375

Raw Statistics

Number of Valid Observations 298

Confidence Coefficient

Arsenic

From File Site_Arsenic.wst

Full Precision OFF

Goodness-of-Fit Test Statistics for Full Data Sets without Non-Detects

User Selected Options


Exhibit ADESCRIPTIVE STATISTICS OF RAW ARSENIC DATASET


Data appear Lognormal at (0.05) Significance Level


Lilliefors Critical (0.95) Value 0.0513

Approximate Shapiro Wilk Test Statistic 0.964

Approximate Shapiro Wilk P Value 4.661E-05

Lognormal Distribution Test Results



Exhibit BCUMULATIVE PROBABILITY PLOT OF LOG-TRANSFORMED ARSENIC DATASET


99.9

9

99.9

0

99.0

0

95.0

0

90.0

0

80.0

0

70.0

0

60.0

0

50.0

0

40.0

0

30.0

0

20.0

0

10.0

0

5.00

1.00

0.10

0.01

Cumulative Percent

1.2

0.8

0.4

0.0

-0.4

-0.8

Soil

Con

cent

ratio

n [m

g/kg

]Log10(Arsenic)


Exhibit CBOX PLOT OF LOG-TRANSFORMED ARSENIC DATASET



Exhibit DOUTLIER TESTS OF LOG-TRANSFORMED ARSENIC DATASET


1

5

# Mean outlier Number value (5%)

Test for Suspected Outliers with Dixon test

Test for Suspected Outliers with Rosner test

Rosner's Outlier Test for Log10(Arsenic)

CriticalObs. Critical

3.708

Test

1

value

4.0780.393 0.243 1.079 2.8271

value (1%)sd

2 0.391 0.24 1.064

2.851 3.708 4.078

2.806 3.708 4.078

0.234 1.017

33 0.388 0.237 1.064

2

Number of data

For 1% Significance Level, there is no Potential Outlier

0.964

4 2.695 3.708 4.0784 0.386

For 5% Significance Level, there is no Potential Outlier

5 3.708 4.0785 0.384 0.232 2.505

From File Site_Arsenic.wst

Full Precision OFF

Outlier Tests for Selected Variables


Potential

Mean 0.393

Standard Deviation

288

Number of suspected outliers 5

0.243



IRIS ENVIRONMENTAL

ATTACHMENT C

DATA STATISTICAL EVALUATION

LOCAL BACKGROUND SOILS

1.428

Raw Statistics Log-transformed Statistics

Minimum 1.27 Minimum of Log Data 0.239

Shapiro Wilk Critical Value 0.859

99% Chebyshev (MVUE) UCL 4.999

95% UCLs (Adjusted for Skewness) 95% Chebyshev (MVUE) UCL 3.498

95% Adjusted-CLT UCL (Chen-1995) 2.851 97.5% Chebyshev (MVUE) UCL 4.005

Mean 102.7 Mean of log Data 4.626

Maximum 118 Maximum of Log Data 4.771

Raw Statistics


Log-transformed Statistics

Number of Distinct Observations 11Number of Valid Observations 12

General Statistics

Chemical (barium)

and Singh and Singh (2003). For additional insight, the user may want to consult a statistician.

Note: Suggestions regarding the selection of a 95% UCL are provided to help the user to select the most appropriate 95% UCL.

These recommendations are based upon the results of the simulation studies summarized in Singh, Singh, and Iaci (2002)

Potential UCL to Use Use 95% Student's-t UCL 2.825

95% Adjusted Gamma UCL 3.001

95% Approximate Gamma UCL 2.901

99% Chebyshev(Mean, Sd) UCL 5.061Assuming Gamma Distribution

97.5% Chebyshev(Mean, Sd) UCL 4.045

95% Chebyshev(Mean, Sd) UCL 3.528Data appear Gamma Distributed at 5% Significance Level

Kolmogorov-Smirnov 5% Critical Value 0.246 95% BCA Bootstrap UCL 2.812

Kolmogorov-Smirnov Test Statistic 0.195 95% Percentile Bootstrap UCL 2.808

Anderson-Darling 5% Critical Value 0.731 95% Hall's Bootstrap UCL 2.896

Anderson-Darling Test Statistic 0.361 95% Bootstrap-t UCL 2.937

95% Standard Bootstrap UCL 2.76

Adjusted Chi Square Value 100 95% Jackknife UCL 2.825

Nonparametric Statistics

Adjusted Level of Significance 0.029 95% CLT UCL 2.784

Approximate Chi Square Value (.05) 103.4

nu star 128.6

MLE of Standard Deviation 1.007

MLE of Mean 2.333

Data appear Normal at 5% Significance Level

Theta Star 0.435

k star (bias corrected) 5.36

Gamma Distribution Test Data Distribution

95% Modified-t UCL (Johnson-1978) 2.835

Assuming Normal Distribution Assuming Lognormal Distribution

95% Student's-t UCL 2.825 95% H-UCL 2.978


Data appear Normal at 5% Significance Level Data appear Lognormal at 5% Significance Level

Normal Distribution Test

Shapiro Wilk Test Statistic 0.945Shapiro Wilk Test Statistic 0.905

Lognormal Distribution Test

Relevant UCL Statistics

Skewness 0.793

Coefficient of Variation 0.407

SD 0.95

Median 1.965 SD of log Data 0.393


Maximum 4.17 Maximum of Log Data

General Statistics

Number of Valid Observations 12 Number of Distinct Observations 12

Chemical (arsenic)

Confidence Coefficient 95%

Number of Bootstrap Operations 2000

From File qryProUCLVer4_ForOutput_10ft.wst

Full Precision OFF

General UCL Statistics for Data Sets with Non-Detects


Page 1 of 10


108 97.5% Chebyshev (MVUE) UCL 123.5




95% Modified-t UCL (Johnson-1978) 108.6 99% Chebyshev (MVUE) UCL 135.9

Approximate Chi Square Value (.05) 1491

95% Adjusted Gamma UCL 110

Lognormal Distribution Test with Detected Values Only

Shapiro Wilk Test Statistic 0.886 Shapiro Wilk Test Statistic 0.9

Normal Distribution Test with Detected Values Only

UCL Statistics

It is recommended to have 10-15 or more distinct observations for accurate and meaningful results.

the resulting calculations may not be reliable enough to draw conclusions

Note: It should be noted that even though bootstrap may be performed on this data set

Warning: There are only 6 Detected Values in this data

Maximum Non-Detect 0.25 Maximum Non-Detect -1.386

SD of Detected 0.159

Minimum Non-Detect 0.25 Minimum Non-Detect -1.386


Mean of Detected 0.306 Mean of Detected -1.194

Maximum Detected 0.369 Maximum Detected -0.997

Minimum Detected 0.253 Minimum Detected -1.374


Percent Non-Detects 50.00%

Number of Distinct Detected Data 6 Number of Non-Detect Data 6

Number of Valid Data 12 Number of Detected Data 6

General Statistics

Chemical (beryllium)





Assuming Gamma Distribution 99% Chebyshev(Mean, Sd) UCL 135.4

95% Approximate Gamma UCL 109

Data appear Gamma Distributed at 5% Significance Level 95% Chebyshev(Mean, Sd) UCL 117


Kolmogorov-Smirnov 5% Critical Value 0.245 95% BCA Bootstrap UCL 108


Anderson-Darling 5% Critical Value 0.731 95% Hall's Bootstrap UCL 108


95% Standard Bootstrap UCL 108




nu star 1582


MLE of Mean 102.7

Theta Star 1.558

k star (bias corrected) 65.92 Data appear Normal at 5% Significance Level


95% Adjusted-CLT UCL (Chen-1995)


Shapiro Wilk Critical Value 0.859 Shapiro Wilk Critical Value 0.859



Normal Distribution Test Lognormal Distribution Test

Skewness -0.118


SD 11.36

Median 101 SD of log Data 0.112

Page 2 of 10


Data Distribution Test with Detected Values Only

SD in Original Scale 0.0722

nu star 284.7

0.0415

K-S Test Statistic 0.697 Mean 0.28

0.313

Assuming Gamma Distribution

Gamma ROS Statistics using Extrapolated Data 95% KM (jackknife) UCL 0.3







Skewness -0.139


SD 1.822



Maximum 12.4 Maximum of Log Data 2.518




General Statistics

Chemical (chromium)


These recommendations are based upon the results of the simulation studies summarized in Singh, Maichle, and Lee (2006).

For additional insight, the user may want to consult a statistician.

Note: DL/2 is not a recommended method.


95% KM (t) UCL 0.303

95% KM (Percentile Bootstrap) UCL 0.312 95% Gamma Approximate UCL 0.332

AppChi2 817.7

Nu star 885.8 Potential UCLs to Use

Theta star 0.0083

k star 36.91 99% KM (Chebyshev) UCL 0.41

SD 0.0452 97.5% KM (Chebyshev) UCL 0.361

Median 0.303 95% KM (Chebyshev) UCL 0.337

Mean 0.306 95% KM (Percentile Bootstrap) UCL 0.312

Maximum 0.369 95% KM (BCA) UCL 0.323

Minimum 0.234 95% KM (bootstrap t) UCL

95% KM (z) UCL 0.301

95% KM (t) UCL 0.303

SE of Mean 0.0131Data appear Gamma Distributed at 5% Significance Level

5% K-S Critical Value 0.332 SD

A-D Test Statistic 0.384 Nonparametric Statistics

5% A-D Critical Value 0.697 Kaplan-Meier (KM) Method

Gamma Distribution Test with Detected Values Only


Theta Star 0.0129

95% BCA Bootstrap UCL 0.283

95% Percentile Bootstrap UCL 0.282

95% MLE (Tiku) UCL 0.295

95% t UCL 0.285

95% MLE (t) UCL 0.287 Mean in Original Scale 0.248

SD 0.0723 SD in Log Scale 0.292

Mean 0.249 Mean in Log Scale -1.435

Maximum Likelihood Estimate(MLE) Method Log ROS Method

95% DL/2 (t) UCL 0.268 95% H-Stat (DL/2) UCL 0.295

SD 0.1 SD 0.475

DL/2 Substitution Method

Mean 0.216 Mean -1.637




5% Shapiro Wilk Critical Value 0.788 5% Shapiro Wilk Critical Value 0.788

Page 3 of 10



1.991










Adjusted Chi Square Value 380.6 95% Jackknife UCL 5.911




nu star 434.8


MLE of Mean 5.312


Theta Star 0.293












Skewness 0.675


SD 1.155



Maximum 7.32 Maximum of Log Data

General Statistics



Chemical (cobalt)














95% CLT UCL 10.2


Adjusted Level of Significance 0.029


nu star 492.2


MLE of Mean 9.337


Theta Star 0.455


95% Adjusted-CLT UCL (Chen-1995) 10.18


97.5% Chebyshev (MVUE) UCL 12.79



Page 4 of 10


11.67 97.5% Chebyshev (MVUE) UCL 15.23













Data appear Gamma Distributed at 5% Significance Level 95% Chebyshev(Mean, Sd) UCL 13.7










nu star 299.5


MLE of Mean 10.36

Theta Star 0.83



95% Adjusted-CLT UCL (Chen-1995)






Skewness 0.214


SD 2.651




Raw Statistics



Number of Distinct Observations 12Number of Valid Observations 12

General Statistics

Chemical (copper)












Page 5 of 10


41.89

95% UCLs (Adjusted for Skewness)

Assuming Normal Distribution

95% H-UCL 24.26

Data do not follow a Discernable Distribution (0.05)

Theta Star 8.301



7



SD of Detected 0.0254 SD of Detected 0.23






Number of Distinct Detected Data 5 Number of Non-Detect Data

General Statistics

Chemical (mercury)




Potential UCL to Use Use 95% Chebyshev (Mean, Sd) UCL 21.53


97.5% Chebyshev(Mean, Sd) UCL 26

Kolmogorov-Smirnov 5% Critical Value 0.249

95% Chebyshev(Mean, Sd) UCL 21.53Data not Gamma Distributed at 5% Significance Level








Approximate Chi Square Value (.05) 20.35 Nonparametric Statistics

nu star 32.35


MLE of Mean 11.19



95% Modified-t UCL (Johnson-1978) 15.48 99% Chebyshev (MVUE) UCL



Assuming Lognormal Distribution

95% Student's-t UCL 15.45

Data not Normal at 5% Significance Level Data not Lognormal at 5% Significance Level





Skewness 0.237


SD 8.213







General Statistics

Chemical (lead)

Page 6 of 10

LOCAL BACKGROUND SOILSMaximum Non-Detect -2.483

95% H-Stat (DL/2) UCL 0.101


Gamma Distribution Test with Detected Values Only Data Distribution Test with Detected Values Only


95% KM (Chebyshev) UCL 0.125



0.109

Theta star 0.00744

95% Gamma Approximate UCL 0.135 95% KM (Percentile Bootstrap) UCL 0.123

General Statistics


Chemical (nickel)







AppChi2 340.2 95% KM (t) UCL


Median 0.123

Minimum 0.0779 95% KM (bootstrap t) UCL 0.109


95% KM (z) UCL 0.108Assuming Gamma Distribution

95% KM (t) UCL 0.109


5% K-S Critical Value 0.357 SD 0.0198




nu star 97.77

Theta Star 0.0115





95% t UCL 0.0964




Maximum Likelihood Estimate(MLE) Method


Log ROS Method

95% DL/2 (t) UCL 0.0919

SD 0.0397 SD 0.52

Mean 0.0714 Mean -2.771

DL/2 Substitution Method DL/2 Substitution Method




Normal Distribution Test with Detected Values Only Lognormal Distribution Test with Detected Values Only

UCL Statistics





Maximum Non-Detect 0.0835

Page 7 of 10


Mean of log Data 1.869

7.09






8.222








Assuming Lognormal DistributionAssuming Normal Distribution


Data appear Lognormal at 5% Significance Level




Skewness 1.112


SD 4.837


Mean 26.24




General Statistics

Chemical (vanadium)




Use 95% Student's-t UCL 7.028Potential UCL to Use



97.5% Chebyshev(Mean, Sd) UCL

95% Bootstrap-t UCL 7.009


Anderson-Darling Test Statistic 0.391





nu star 952.8


MLE of Mean 6.546

Theta Star 0.165






95% H-UCL







Skewness -0.107


SD 0.93


Mean 6.546




Page 8 of 10

LOCAL BACKGROUND SOILS28.91




34.96




SD of log Data 0.383



Shapiro Wilk Test Statistic 0.932



81.28


95% H-UCL 60.67



95% Hall's Bootstrap UCL 55.6Anderson-Darling 5% Critical Value 0.731



95% CLT UCL 56.2


Adjusted Level of Significance 0.029


nu star 141.3


MLE of Mean 47.77

Theta Star 8.114






97.5% Chebyshev (MVUE) UCL



Data appear Lognormal at 5% Significance LevelData appear Normal at 5% Significance Level



Skewness 0.338


SD 17.76

Median 46.2




General Statistics

Chemical (zinc)






Data follow Appr. Gamma Distribution at 5% Significance Level 95% Chebyshev(Mean, Sd) UCL 32.33









nu star 628


MLE of Mean 26.24

Theta Star 1.003





95% UCLs (Adjusted for Skewness) 95% Chebyshev (MVUE) UCL 32

95% H-UCL

Page 9 of 10













Page 10 of 10

EXPOSED SOILS (0-0.5 FEET BGS)






Minimum 1E-12 95% KM (bootstrap t) UCL 0.189

Assuming Gamma Distribution 95% KM (z) UCL 0.144


Data appear Gamma Distributed at 5% Significance Level SE of Mean 0.0235

95% KM (t) UCL 0.145





nu star 13.39


Theta Star 0.204




95% t UCL 0.091


Mean in Original Scale 0.0618

MLE method failed to converge properly Mean in Log Scale -3.52

SD in Log Scale 1.155

Maximum Likelihood Estimate(MLE) Method N/A Log ROS Method


SD 0.72 SD 1.945

Mean 0.48 Mean -2.169








UCL Statistics




Observations < Largest ND are treated as NDs Single DL Non-Detect Percentage 100.00%

Note: Data have multiple DLs - Use of KM Method is recommended Number treated as Non-Detect 37

For all methods (except KM, DL/2, and ROS Methods), Number treated as Detected 0

Maximum Non-Detect 5 Maximum Non-Detect 1.609









General Statistics


Chemical (1-methylnaphthalene)



From File qryProUCLVer4_ForOutput_Surface.wst

Full Precision OFF



Page 1 of 39



Data not Normal at 5% Significance Level Data appear Lognormal at 5% Significance Level

Mean 0.497 Mean -1.86

0.21




Median 0.379



Gamma ROS Statistics using Extrapolated Data


95% KM (jackknife) UCL 0.242


95% KM (t) UCL 0.25

5% K-S Critical Value 0.224

Data follow Appr. Gamma Distribution at 5% Significance Level SE of Mean 0.0376

SD



nu star 49.27

Theta Star 0.203

k star (bias corrected) 1.642 Data Follow Appr. Gamma Distribution at 5% Significance Level




95% t UCL 0.208



MLE method failed to converge properly


Mean in Log Scale -2.382



SD 0.654 SD 1.843



UCL Statistics















General Statistics










AppChi2 32.35 95% KM (t) UCL 0.145

Theta star 0.718

Page 2 of 39




Maximum Non-Detect 7.5 Maximum Non-Detect 2.015

Mean -2.164


Data appear Gamma Distributed at 5% Significance Level

95% KM (Percentile Bootstrap) UCL 0.175


Mean 0.508

95% KM (bootstrap t) UCL 0.267


Minimum 0.019



95% KM (t) UCL 0.163






nu star 11.97

Theta Star 0.485





95% t UCL 0.117




Mean in Log Scale -4.165MLE method failed to converge properly



SD 0.899 SD 1.971

Mean 0.541






UCL Statistics

Single DL Non-Detect Percentage 100.00%Observations < Largest ND are treated as NDs

Number treated as Detected 0For all methods (except KM, DL/2, and ROS Methods),

Number treated as Non-Detect 55Note: Data have multiple DLs - Use of KM Method is recommended




Maximum Detected 1.6 Maximum Detected 0.47



Chemical (acenaphthene)

General Statistics







95% Gamma Approximate UCL 0.449

AppChi2 233.5 95% KM (t) UCL 0.25



Theta star 0.132

k star 2.941

Page 3 of 39


Number of Detected Data 27




2.996




95% KM (BCA) UCL 3.128



Maximum 20

95% KM (t) UCL 3.01




Kaplan-Meier (KM) Method


5% A-D Critical Value 0.804


nu star 26.91

Theta Star 8.16

k star (bias corrected) 0.498 Data appear Gamma Distributed at 5% Significance Level




95% t UCL 2.946




Maximum Likelihood Estimate(MLE) Method N/A


Log ROS Method


SD 4.122 SD 2.478


Mean 2.281 Mean -1.276







UCL Statistics







Mean of Detected 4.067 Mean of Detected 0.223

Maximum Detected 20 Maximum Detected


General Statistics


Number of Valid Data 55


Chemical (acenaphthylene)



AppChi2 149.1 95% KM (t) UCL 0.163

Nu star 179 Potential UCLs to Use

Theta star 0.312



Page 4 of 39

EXPOSED SOILS (0-0.5 FEET BGS)Median 2.7 95% KM (Chebyshev) UCL 4.524



4.731

Potential UCLs to Use


1.766





Minimum 0.027


95% KM (t) UCL



nu star 19.45

Theta Star 6.189





95% t UCL 1.714



MLE yields a negative mean Mean in Log Scale -3.002



SD 2.64


SD 2.348

Mean 1.331 Mean -1.772







UCL Statistics








Maximum Detected 13 Maximum Detected 2.565





General Statistics


Chemical (anthracene)





95% Adjusted Gamma UCL


AppChi2 73.24 95% KM (t) UCL 3.01

Nu star 94.68

Theta star 4.223

k star 0.861

Page 5 of 39



AppChi2 97.71 95% KM (t) UCL 1.766

78.00%





95% KM (t) UCL 4.518

Data not Gamma Distributed at 5% Significance Level SE of Mean 1.173



nu star 10.37

Theta Star 20.54


k star (bias corrected) 0.471 Data appear Lognormal at 5% Significance Level




95% t UCL 4.1




Log ROS Method

Mean in Log Scale -3.275MLE yields a negative mean


95% H-Stat (DL/2) UCL 1.713 95% DL/2 (t) UCL 4.315

SD 8.027 SD 1.153

Mean 2.412 Mean -0.541









UCL Statistics











Percent Non-Detects


General Statistics

Chemical (antimony)








Theta star 2.967




Maximum 13 95% KM (BCA) UCL 1.799

Page 6 of 39



7.665




Mean 3.316 Mean in Log Scale 1.019

95% MLE (Tiku) UCL 3.811 SD in Original Scale 2.16


95% t UCL 3.847

3.85



95% KM (z) UCL 3.84




95% KM (t) UCL





nu star 284.2


Theta Star 1.169




SD 2.17


SD 2.167 SD 0.652

Mean 3.33 Mean 1.009








UCL Statistics





Maximum Detected 10.4




Minimum Detected 0.807

Raw Statistics

Minimum Detected -0.214




General Statistics

Chemical (arsenic)







AppChi2 10.57 95% KM (Chebyshev) UCL 7.665


Theta star 39.22



Median 7.246 95% KM (Chebyshev) UCL




Page 7 of 39


95% KM (BCA) UCL 3.865

95% KM (BCA) UCL 3.865

k star 0.781











99% Chebyshev(Mean, Sd) UCL 145Assuming Gamma Distribution

Data not Gamma Distributed at 5% Significance Level 95% Chebyshev(Mean, Sd) UCL 119.9








nu star 804.3



MLE of Mean 100.4

Theta Star 12.48







Data appear Normal at 5% Significance Level Data not Lognormal at 5% Significance Level




Skewness -0.00217


SD 31.7


Maximum of Log Data 5.252


Maximum 191

Raw Statistics




General Statistics

Chemical (barium)







AppChi2 58.74



Theta star 4.254




Maximum 10.4


Page 8 of 39





k star (bias corrected) 0.466 Data do not follow a Discernable Distribution (0.05)

Theta Star 0.0302

0.0124








AppChi2 6.001 95% KM (BCA) UCL 0.0135


Theta star 0.139

97.5% KM (Chebyshev) UCL 0.0263


SD 0.0296







95% KM (t) UCL






nu star 22.35



95% t UCL 0.0114






SD 0.0591 SD 1.831

Mean 0.022 Mean -5.771






UCL Statistics










Raw Statistics






General Statistics

Chemical (benzene)

Page 9 of 39


0.925

Observations < Largest ND are treated as NDs

Note: Data have multiple DLs - Use of KM Method is recommended

For all methods (except KM, DL/2, and ROS Methods),












Theta star 65.29


Median 0.38



Maximum 83


95% KM (BCA) UCL 11.07





95% KM (t) UCL 10.92


Mean 7.592






nu star 29.76

Theta Star 28.05





95% t UCL 10.91






SD 14.71 SD 2.872

Mean 7.595 Mean -0.54



UCL Statistics


Shapiro Wilk Test Statistic 0.657 Shapiro Wilk Test Statistic

Single DL Non-Detect Percentage 47.27%

Number treated as Detected 29

Number treated as Non-Detect 26












General Statistics

Chemical (benzo(a)anthracene)

Page 10 of 39


Number of Non-Detect Data 9



-3.912




95% DL/2 (t) UCL 18.71




Theta star 105.5







Nu star 14


SD 23.39



Minimum 1E-12




95% KM (t) UCL 18.72

Mean 13.43





nu star 29.96

Theta Star 49.27





95% t UCL 18.7

95% MLE (t) UCL 9.423




Mean 1.509


95% H-Stat (DL/2) UCL 659.1

SD 23.39 SD 2.958

Mean 13.43 Mean 0.016






UCL Statistics





Minimum Non-Detect 0.02 Minimum Non-Detect




General Statistics


Number of Distinct Detected Data 42

Chemical (benzo(a)pyrene)


Page 11 of 39





MLE of Mean 19.09





47.6



Chemical (benzo(b)fluoranthene)









General Statistics






Potential UCL to Use Use 97.5% Chebyshev (Mean, Sd) UCL




Kolmogorov-Smirnov Test Statistic 0.183






nu star 29.97


Theta Star 70.08




95% Adjusted-CLT UCL (Chen-1995) 28.22 97.5% Chebyshev (MVUE) UCL 362

95% Chebyshev (MVUE) UCL 274.7 95% UCLs (Adjusted for Skewness)




95% H-UCL 777.8

Data appear Lognormal at 5% Significance LevelData not Normal at 5% Significance Level


Lilliefors Critical Value 0.119 Lilliefors Critical Value 0.119




Skewness 2.466


SD 33.85



Maximum 170.1

Minimum 0.0175 Minimum of Log Data -4.046

General Statistics


Chemical (benzo(a)pyrene equivalent)



Page 12 of 39






Theta Star 58.49

15.18





SD of Detected 2.645SD of Detected 32.91








General Statistics


Chemical (benzo(g,h,i)perylene)







Potential UCLs to UseNu star 13.79


Theta star 121.1



Median 1





95% KM (t) UCL 22.06

SE of Mean 4.108Data not Gamma Distributed at 5% Significance Level


K-S Test Statistic 0.858 Mean


nu star 28.54



95% t UCL 22.04



Log ROS Method




SD 30.41 SD 2.996

Mean 15.18 Mean 0.0147









UCL Statistics





Page 13 of 39




nu star 30.39


25.86


95% KM (BCA) UCL 25.53

95% KM (z) UCL 25.74



Maximum Detected 220






General Statistics

Chemical (benzo(k)fluoranthene)









Theta star 148.3




Mean 18.81 95% KM (Percentile Bootstrap) UCL 26

Maximum 140





95% KM (t) UCL




Theta Star 68.07




95% t UCL 25.85






95% DL/2 (t) UCL 25.85 95% H-Stat (DL/2) UCL 1281

SD 31.19 SD 3.04

Mean 18.81 Mean 0.327



UCL Statistics






Maximum Non-Detect -1.109Maximum Non-Detect 0.33


Page 14 of 39




95% H-Stat (DL/2) UCL 489.1

SD 33.54 SD 2.962





Mean 12.87









General Statistics










Theta star 114.4









95% KM (t) UCL 20.46

SE of Mean 4.533Data follow Appr. Gamma Distribution at 5% Significance Level




nu star 27.17

Theta Star 52.09



95% t UCL 20.44




95% DL/2 (t) UCL 20.44


Mean 12.88 Mean -0.297







UCL Statistics








Page 15 of 39




5% Shapiro Wilk Critical Value 0.866

UCL Statistics



Mean -1.946




0.065


nu star 199.9


0.215









Chemical (cadmium)






General Statistics







AppChi2 918.2 95% KM (t) UCL 0.215

Nu star 990.2

Theta star 0.0258

k star 9.902




Minimum 0.077


95% KM (t) UCL



Theta Star 0.0328





95% t UCL 0.213

95% MLE (Tiku) UCL 0.198 SD in Original Scale




SD 0.075 SD 0.356

Mean 0.154










Page 16 of 39




SD 0.107 SD 0.259



0.263



Minimum 0.00286


General Statistics

Chemical (chromium)









AppChi2 107.8 95% KM (t) UCL 0.242

k star 1.335

Theta star 0.216



Median 0.253






95% KM (z) UCL 0.242


95% KM (t) UCL 0.242





nu star 19.9

Theta Star 0.268





95% t UCL





Mean 0.278 Mean -1.322







UCL Statistics










Maximum Detected -0.304

Page 17 of 39



















Raw Statistics






General Statistics

Chemical (chrysene)















nu star 255.4



MLE of Mean 12.1

Theta Star 4.736











Skewness 2.942


SD 9.959

Minimum of Log Data 1.008


Minimum 2.74


Page 18 of 39


0.945 5% Shapiro Wilk Critical Value 0.945


3.053





14.64

SD 18.48

Mean 10.42

Skewness 0.034


SD 1.866







Chemical (cobalt)

General Statistics










Theta star 81.65

k star 0.128









95% KM (t) UCL





nu star 29.68

Theta Star 38.61




95% t UCL 14.63




SD in Log Scale


SD 18.65 SD 2.9

Mean 10.43 Mean -0.216




5% Shapiro Wilk Critical Value


UCL Statistics

Page 19 of 39


5.193








MLE of Mean 28.79


Theta Star 19.11












Skewness 3.003


SD 32.23



Maximum 180 Maximum of Log Data


Chemical (copper)

General Statistics

















nu star 697.7


MLE of Mean 5.5



Theta Star 0.788







Data appear Normal at 5% Significance Level Data not Lognormal at 5% Significance Level





Page 20 of 39


0.915





N/A Log ROS Method

Mean 1.582 Mean -1.689

nu star 23.81

Theta Star 6.509






95% t UCL 2.099



MLE yields a negative mean





SD 2.954 SD 2.443




UCL Statistics

















General Statistics

Chemical (dibenz(a,h)anthracene)



















nu star 150.6

Page 21 of 39


2.134


0.905









95% t UCL 46.38






SD 63.59 SD 3.199

Mean 32.04 Mean 0.537



UCL Statistics

















General Statistics

Chemical (fluoranthene)







AppChi2 106.7 95% KM (t) UCL 2.134


Theta star 2.917









95% KM (t) UCL






Page 22 of 39






-4.605




95% t UCL 0.898







SD 1.699 SD 2.161

Mean 0.835 Mean -1.988






UCL Statistics









General Statistics



Chemical (fluorene)









Theta star 236


Median 1.4



Maximum 300


95% KM (BCA) UCL 45.7





95% KM (t) UCL 46.4


Mean 32.03






nu star 26.71

Theta Star 131.9



Page 23 of 39





Theta star 16.29


AppChi2 14.33 95% KM (t) UCL 0.97


Mean of Detected 0.84





SD 24.73






SD 2.972


Mean 14.54 Mean 0.1







UCL Statistics












General Statistics

Chemical (indeno(1,2,3-cd)pyrene)







Nu star 24.63


SD 3.87



Minimum 1E-12




95% KM (t) UCL 0.97

Mean 0.574





nu star 11.87

Theta Star 4.707




Page 24 of 39





Adjusted Chi Square Value 21.75 95% Jackknife UCL 1578

Adjusted Level of Significance 0.0453 95% CLT UCL 1563


nu star 34.47

MLE of Standard Deviation 1318

MLE of Mean 766


Theta Star 2267

Data DistributionGamma Distribution Test

95% Adjusted-CLT UCL (Chen-1995) 2068

95% Modified-t UCL (Johnson-1978) 1657 99% Chebyshev (MVUE) UCL 2360

97.5% Chebyshev (MVUE) UCL 1673

95% UCLs (Adjusted for Skewness) 95% Chebyshev (MVUE) UCL 1324

95% Student's-t UCL 1578 95% H-UCL 1291




Lilliefors Test Statistic 0.413 Lilliefors Test Statistic 0.0535



Skewness 6.966


SD 3461

Mean 766 Mean of log Data 4.689





Chemical (lead)

General Statistics







Theta star 114.2


Median 1.2








95% KM (t) UCL 20.13


Mean 14.54





nu star 30.22


Theta Star 52.91




95% t UCL 20.12

Page 25 of 39



Mean of Detected -2.163








nu star 18.01

Theta Star 0.53



95% t UCL 0.211








Mean 0.125

SD 0.388 SD 0.853

Mean -2.83





Data appear Lognormal at 5% Significance LevelData not Normal at 5% Significance Level




UCL Statistics














Chemical (mercury)

General Statistics




H-statistic often results in unstable (both high and low) values of UCL95 as shown in examples in the Technical Guide.

It is therefore recommended to avoid the use of H-statistic based 95% UCLs.

Use of nonparametric methods are preferred to compute UCL95 for skewed data sets which do not follow a gamma distribution.

ProUCL computes and outputs H-statistic based UCLs for historical reasons only.

Potential UCL to Use Use 95% H-UCL 1291

Assuming Gamma Distribution 99% Chebyshev(Mean, Sd) UCL 5588

95% Approximate Gamma UCL 1198


95% Chebyshev(Mean, Sd) UCL 2879Data not Gamma Distributed at 5% Significance Level

95% Percentile Bootstrap UCL 1697



95% Bootstrap-t UCL 6828




Page 26 of 39



95% KM (t) UCL 0.211

0.225


0.352




Chemical (molybdenum)


SD 1.467

Mean 1.539 Mean -1.134

2.059


2.481


nu star 20.32

Theta Star 7.154





95% t UCL



SD in Log Scale


SD 4.026







UCL Statistics











Minimum Detected 0.103

Raw Statistics

Minimum Detected -2.273




General Statistics





95% Gamma Approximate UCL

AppChi2 139.7 95% KM (BCA) UCL 0.225

Nu star 168.7

Theta star 0.172





Maximum 2.77 95% KM (BCA) UCL





Page 27 of 39



Minimum 1E-12






76.36%



Mean -0.584



Theta Star 24.16

nu star 27.51







95% t UCL 11.58






SD 24.4 SD 2.51

Mean 6.157





UCL Statistics

Observations < Largest ND are treated as NDs Single DL Non-Detect Percentage


Maximum Non-Detect 4







General Statistics

Chemical (naphthalene)









k star 0.276

Theta star 25.8



Median 3.652






95% KM (z) UCL 2.487


95% KM (t) UCL 2.506





Page 28 of 39



AppChi2 4.479 97.5% KM (Chebyshev) UCL 26.74



0.947


SD 617.4

156.3



Assuming Gamma Distribution 99% Chebyshev(Mean, Sd) UCL 1010



95% Hall's Bootstrap UCL 755.4


Anderson-Darling 5% Critical Value 0.854






nu star 32.9


MLE of Mean 141

Theta Star 428.7

Data Distribution


Gamma Distribution Test




97.5% Chebyshev (MVUE) UCL




Shapiro Wilk Critical Value



Skewness 6.649



Mean 141


Minimum 3 Minimum of Log Data 1.099


General Statistics

Chemical (nickel)







Theta star 66.27





Mean 6.535



Minimum 1E-12



95% KM (t) UCL 11.63






Page 29 of 39

EXPOSED SOILS (0-0.5 FEET BGS) 95% Approximate Gamma UCL 223.2




Mean 20.01

Theta star 126.7


SD 41.51 97.5% KM (Chebyshev) UCL 55

Mean 20.01







95% KM (t) UCL 29.39



Kaplan-Meier (KM) Method


5% A-D Critical Value 0.871


nu star 27.64

Theta Star 79.64






95% t UCL 29.38



Mean in Log Scale 0.0923



Mean 0.194

SD 41.51 SD 3







UCL Statistics






Minimum Non-Detect -3.912


Minimum Non-Detect 0.02










General Statistics

Chemical (phenanthrene)





Page 30 of 39

EXPOSED SOILS (0-0.5 FEET BGS)Potential UCLs to Use












Minimum 1E-12



95% KM (t) UCL 52.96




Mean 36.71



nu star 27.2

Data do not follow a Discernable Distribution (0.05)k star (bias corrected) 0.278

Theta Star 148.4




95% t UCL 52.94



95% MLE (t) UCL 31.7





SD 71.92 SD 3.211

Mean 36.71 Mean 0.695





UCL Statistics















General Statistics

Chemical (pyrene)







Nu star 17.37

Page 31 of 39



0.354







Mean 0.299



95% KM (t) UCL 0.272


Mean 0.243





nu star 106.4

Theta Star 0.0653





95% t UCL 0.27




SD in Log Scale


Mean -1.889

SD 0.106 SD 0.421

Mean 0.169






UCL Statistics











Chemical (silver)

General Statistics









Theta star 252.9

Page 32 of 39

EXPOSED SOILS (0-0.5 FEET BGS)k star 14.86 99% KM (Chebyshev) UCL 0.414







95% t UCL 0.0504


Theta Star 0.3



Data not Gamma Distributed at 5% Significance Level

Minimum 1E-12


95% KM (z) UCL 0.0512

95% KM (t) UCL 0.0517

SE of Mean 0.0185






nu star 7.377








Mean -6.144

SD 0.143 SD 1.965

Mean 0.0357







UCL Statistics







Maximum Detected -0.0101







Chemical (toluene)

General Statistics






AppChi2 1397 95% KM (t) UCL 0.272


Theta star 0.0201

Page 33 of 39

















95% KM (z) UCL 2.788

95% KM (t) UCL 2.824

SE of Mean 0.548



Nonparametric StatisticsA-D Test Statistic 0.348


nu star 24.66


Theta Star 2.997




95% t UCL 2.588






SD 2.782 SD 1.291

Mean 1.628 Mean -0.441




UCL Statistics






Maximum Detected 13






General Statistics

Chemical (total cyanide)









Nu star 26.31

Theta star 0.266

k star 0.239




Page 34 of 39


95% KM (t) UCL 2.824






95% DL/2 (t) UCL 1337 95% H-Stat (DL/2) UCL 8245

Data Follow Appr. Gamma Distribution at 5% Significance Level

Median 280 95% KM (Chebyshev) UCL 1902

Maximum 6500

Mean 986.1 95% KM (Percentile Bootstrap) UCL 1336

95% KM (BCA) UCL 1372


Minimum 1E-12 95% KM (bootstrap t) UCL 1419

95% KM (jackknife) UCL 1337

Assuming Gamma Distribution 95% KM (z) UCL 1332

95% KM (t) UCL 1338


Mean 986.6

5% K-S Critical Value 0.132 SD 1541





nu star 48.52

Theta Star 2236



95% BCA Bootstrap UCL 1362


95% t UCL 1337

95% MLE (Tiku) UCL 1241 SD in Original Scale 1555

95% MLE (t) UCL 1264 Mean in Original Scale 986.5

SD 1648 SD in Log Scale 2.14

Mean 892 Mean in Log Scale 5.34


SD 1555 SD 2.234

Mean 986.3 Mean 5.287




UCL Statistics



SD of Detected 1599

Minimum Non-Detect 5 Minimum Non-Detect 1.609

Mean of Detected 1085 Mean of Detected 5.724


Minimum Detected 5.8 Minimum Detected 1.758




General Statistics

Chemical (tph-d)







AppChi2 11.56


Theta star 11.97




Page 35 of 39








Mean 6.52 Mean -1.093



nu star 2.763

Theta Star 247.6





95% t UCL 16.57








SD 44.45 SD 1.208



UCL Statistics











SD of Detected 124 SD of Detected 3.307




General Statistics



Chemical (tph-g)






95% Gamma Approximate UCL 1822

AppChi2 10.76 95% KM (Chebyshev) UCL 1902


Theta star 5457

k star 0.181 99% KM (Chebyshev) UCL 3075

SD 1556 97.5% KM (Chebyshev) UCL 2297

Page 36 of 39


44.07



Minimum Detected 19 Minimum Detected 2.944

3.219


SD 2.232


SD in Original Scale 3395

Mean 1917


K-S Test Statistic 0.815 Mean 2266



nu star 45.83


Theta Star 5434

Data Distribution Test with Detected Values OnlyGamma Distribution Test with Detected Values Only



95% t UCL 3032

95% MLE (Tiku) UCL 2735

95% MLE (t) UCL 2766 Mean in Original Scale 2266


SD 3762 SD in Log Scale 2.244



SD 3395

Mean 2265 Mean 6.059






UCL Statistics


Minimum Non-Detect 25 Minimum Non-Detect





Chemical (tph-mo)

General Statistics








AppChi2 6.991 95% KM (t) UCL 17.06



Theta star 314.3

k star 0.133



Median 52.29







95% KM (t) UCL 17.06



SD

Page 37 of 39


99% KM (Chebyshev) UCL 6827


4551


AppChi2 7.953 97.5% KM (Chebyshev) UCL 5129



36.7













95% Jackknife UCL 38.92


Adjusted Chi Square Value 188.4



nu star 222.8


MLE of Mean 31.91

Theta Star 14.32








95% H-UCL






Skewness 3.304

SD 29.58






General Statistics

Chemical (vanadium)







Theta star 15576

k star 0.145

95% KM (Chebyshev) UCL 4264Median 570

Mean 2264 95% KM (Percentile Bootstrap) UCL 3057

Maximum 14000 95% KM (BCA) UCL 3014

95% KM (jackknife) UCL 3032



95% KM (t) UCL 3033

95% KM (z) UCL 3020Assuming Gamma Distribution


Page 38 of 39

EXPOSED SOILS (0-0.5 FEET BGS)Note: Suggestions regarding the selection of a 95% UCL are provided to help the user to select the most appropriate 95% UCL.



Chemical (zinc)

General Statistics



Minimum 16 Minimum of Log Data 2.773




SD 68.07


Skewness 2.08













Theta Star 42.58

MLE of Mean 93.63


nu star 219.9

















Potential UCL to Use Use 95% Approximate Gamma UCL 110.3

Page 39 of 39

ON-SITE SOILS (0-10 FEET BGS)






95% KM (t) UCL 0.0397





nu star 16.05


Theta Star 0.22




95% t UCL 0.017







SD 49.25 SD 1.823

Mean 5.037 Mean -3.67








UCL Statistics
















General Statistics





From File qryProUCLVer4_ForOutput_10ft.wst

Full Precision OFF



Page 1 of 42






95% KM (t) UCL 12.6





nu star 7.122


Theta Star 282.4




95% t UCL 12.42







SD 76.27 SD 1.901

Mean 7.186 Mean -3.517





UCL Statistics















General Statistics










AppChi2 362.7 95% KM (t) UCL 0.0397

Theta star 5.608





Page 2 of 42





95% KM (t) UCL 0.202





nu star 17.63


Theta Star 2.899




95% t UCL 0.184







SD 42.25 SD 1.943

Mean 3.924 Mean -3.396





UCL Statistics















General Statistics



Chemical (acenaphthene)








Theta star 73200252


SD 15150062 97.5% KM (Chebyshev) UCL 34.49

Median 453373 95% KM (Chebyshev) UCL 25.5

Mean 8226079 95% KM (Percentile Bootstrap) UCL 14.07


Page 3 of 42




95% KM (t) UCL 46.49





nu star 23.95


Theta Star 483.4




95% t UCL 46.35







SD 259.1 SD 2.357

Mean 21.01 Mean -2.922




5% Lilliefors Critical Value 0.101 5% Lilliefors Critical Value 0.101

UCL Statistics















General Statistics



Chemical (acenaphthylene)








Theta star 3.589







Page 4 of 42







95% Percentile Bootstrap UCL 152.6Kolmogorov-Smirnov Test Statistic 0.24





95% Jackknife UCL 160.2Adjusted Chi Square Value 2.661


nu star 9.282

Nonparametric StatisticsApproximate Chi Square Value (.05) 3.498

MLE of Mean 86.83

MLE of Standard Deviation 114


Theta Star 149.7


95% Modified-t UCL (Johnson-1978) 163.8 99% Chebyshev (MVUE) UCL 520




95% Student's-t UCL 160.2 95% H-UCL 1038

0.752



Warning: There are only 8 Values in this data

Note: It should be noted that even though bootstrap methods may be performed on this data set,

Skewness 1.612


1.374

SD 109.5

Maximum of Log Data

Median 47.5 SD of log Data


General Statistics



Chemical (ammonia (as n))








Theta star 46715



Median 11 95% KM (Chebyshev) UCL 88.7







The literature suggests to use bootstrap methods on data sets having more than 10-15 observations.



Shapiro Wilk Test Statistic

5.737



Maximum 310

Page 5 of 42



Theta star 224



95% KM (Chebyshev) UCL 46.94Median 54.13

SD 143.6




95% KM (jackknife) UCL 23.31Gamma ROS Statistics using Extrapolated Data

Minimum 1E-12



95% KM (t) UCL 23.44





nu star 17.26


Theta Star 294.6



95% t UCL 23.31




SD 2.232SD 146.6

Mean -3.336Mean 11.03


DL/2 Substitution MethodDL/2 Substitution Method




UCL Statistics








Chemical (anthracene)

General Statistics




Use 95% Approximate Gamma UCL 230.4Potential UCL to Use







99.64%











Page 6 of 42


Theta star 31.98




SD 4.624





Minimum 1E-12



95% KM (t) UCL 1.487





nu star 21.38


Theta Star 12.95



95% t UCL 1.034




SD 0.648SD 3.886

Mean -0.832Mean 0.913


DL/2 Substitution MethodDL/2 Substitution Method




UCL Statistics







General Statistics



Chemical (antimony)












92.59%











Page 7 of 42


Theta star 5.398




Median 2.31

95% KM (BCA) UCL 2.869


Maximum 12





95% KM (t) UCL 2.874





nu star 1608


Theta Star 0.805



95% t UCL 2.868




Mean 2.656




SD 1.712 SD 0.645




UCL Statistics






General Statistics



Chemical (arsenic)







AppChi2 51.09 95% KM (BCA) UCL 1.88


AppChi2 204.8 95% KM (BCA) UCL 2.869



Mean 0.795



Mean 2.677







Page 8 of 42


General Statistics


Chemical (benzene)





or 95% Modified-t UCL 101.2













nu star 3744

Approximate Chi Square Value (.05) 3603 Nonparametric Statistics

MLE of Mean 97.08



Theta Star 12.6






95% Student's-t UCL 101.1 95% H-UCL

0.0568




Skewness 2.963


SD 38.1

4.51


Minimum

Mean 97.08 Mean of log Data


Chemical (barium)

General Statistics









101.3



Lilliefors Critical Value 0.0568 Lilliefors Critical Value

23 Minimum of Log Data 3.135



3.115

Page 9 of 42


Number of Non-Detect Data 143Number of Distinct Detected Data 103


General Statistics



Chemical (benzo(a)anthracene)








Theta star 206.3






Kaplan-Meier (KM) Method5% A-D Critical Value 1.12

Theta Star 498.2

nu star 10.84






95% t UCL 25.65



-10.56

Log ROS Method



MLE method failed to converge properly Mean in Log Scale

95% DL/2 (t) UCL 25.68

SD 1.944

Mean -6.737Mean 9.707

SD 161.6



5% Lilliefors Critical Value 0.118


5% Lilliefors Critical Value













k star 0.221


95% KM (BCA) UCL 29.04


Maximum 2700


95% KM (t) UCL 25.77


95% H-Stat (DL/2) UCL 0.0112

0.118

UCL Statistics





Page 10 of 42




General Statistics



Chemical (benzo(a)pyrene)






108

Median 0.17



1E-12

SD 246.6 97.5% KM (Chebyshev) UCL



95% KM (t) UCL 44.44

SD 230.2

Mean 21.61K-S Test Statistic 0.947




Theta Star 252

nu star 47.82




95% t UCL 44.39







95% H-Stat (DL/2) UCL 6.385

SD 2.751SD 230.6

95% DL/2 (t) UCL 44.43

Mean 21.64 Mean -2.588


UCL Statistics











0.013 Minimum Detected -4.343


777.5


Theta star






Minimum








Minimum Detected

Page 11 of 42


279 166Number of Distinct Observations

General Statistics

Number of Valid Observations


Chemical (benzo(a)pyrene equivalent)






237.4

Median 0.15



1E-12

SD 512.7 97.5% KM (Chebyshev) UCL



95% KM (t) UCL 96.72

SD 509.6

Mean 46.21K-S Test Statistic 0.959




Theta Star 513.6

nu star 50.19




95% t UCL 96.64







95% H-Stat (DL/2) UCL 22.76

SD 3.01SD 510.5

95% DL/2 (t) UCL 96.64

Mean 46.2 Mean -2.183


UCL Statistics






Maximum Non-Detect -1.109







972.8


Theta star



95% KM (bootstrap t) UCL 1463



Minimum









Minimum Detected

Page 12 of 42


0.00875 -4.739

9824 9.193

59.99 -1.74

0.0555 2.91

658.7

10.98

13.33

0.464 0.223

0.053 0.053

125.1 25.13

29

158.5 36.7

130.3 51.83

0.135

444.9

59.99

163.4

75.24

56.26

0.0491 124.9

56.18 125.1

125.6

49.67 1870

1.08 818.5

0.286 131.5

0.0639 167

231.9

306.3

452.4

80.22

80.34

231.9

UCL Statistics










General Statistics





Chemical (benzo(b)fluoranthene)

Use 95% Chebyshev (Mean, Sd) UCLPotential UCL to Use



99% Chebyshev(Mean, Sd) UCLAssuming Gamma Distribution

95% Approximate Gamma UCL

95% Chebyshev(Mean, Sd) UCLData not Gamma Distributed at 5% Significance Level


95% Percentile Bootstrap UCL

Kolmogorov-Smirnov 5% Critical Value 95% BCA Bootstrap UCL

Kolmogorov-Smirnov Test Statistic

95% Bootstrap-t UCL

Anderson-Darling 5% Critical Value 95% Hall's Bootstrap UCL

Anderson-Darling Test Statistic

95% Standard Bootstrap UCL

Adjusted Chi Square Value 95% Jackknife UCL

Adjusted Level of Significance 95% CLT UCL

nu star

Approximate Chi Square Value (.05) Nonparametric Statistics

MLE of Mean

MLE of Standard Deviation

Data do not follow a Discernable Distribution (0.05)k star (bias corrected)

Theta Star


95% Modified-t UCL (Johnson-1978) 99% Chebyshev (MVUE) UCL

95% Chebyshev (MVUE) UCL 95% UCLs (Adjusted for Skewness)

95% Adjusted-CLT UCL (Chen-1995) 97.5% Chebyshev (MVUE) UCL

95% Student's-t UCL 95% H-UCL



Lilliefors Critical Value Lilliefors Critical Value



Lilliefors Test Statistic Lilliefors Test Statistic

Skewness

SD

Maximum of Log Data

Median SD of log Data

Mean Mean of log Data

-4.605





Coefficient of Variation


Minimum Minimum of Log Data

Maximum

Page 13 of 42


UCL Statistics









General Statistics




Chemical (benzo(g,h,i)perylene)








Theta star 566.9




Median 0.13

95% KM (BCA) UCL 68.9


Maximum 4600




95% KM (t) UCL 59.37



Mean 29.19




nu star 54.05


Theta Star 301.3




95% t UCL 59.31





Log ROS Method

SD 304.9




Mean 29.19 Mean -2.229

5% Lilliefors Critical Value 0.07235% Lilliefors Critical Value 0.0723

Lilliefors Test Statistic 0.107Lilliefors Test Statistic 0.452

-4.605





SD 2.955




Page 14 of 42










General Statistics




Chemical (benzo(k)fluoranthene)








Theta star 962.8




Median 0.082

95% KM (BCA) UCL 137


Maximum 11000




95% KM (t) UCL 126.5



Mean 58.36




nu star 55.1


Theta Star 591




95% t UCL 126.4





Log ROS Method

SD 688.4




Mean 58.36 Mean -1.873






-4.605





SD 3.102




Page 15 of 42










General Statistics












Theta star 1070




Median 0.17

95% KM (BCA) UCL 62.59


Maximum 4700




95% KM (t) UCL 59.1



Mean 28.37




nu star 46.88


Theta Star 337.5




95% t UCL 59.03





Log ROS Method

SD 310.4




Mean 28.41 Mean -2.491


UCL Statistics





-1.609





SD 2.815




Page 16 of 42








General Statistics




Chemical (cadmium)





95% Gamma Approximate UCL 0.318 95% KM (% Bootstrap) UCL 0.232


AppChi2 14151 95% KM (t) UCL 0.232

Theta star 0.0105




Median 0.316

95% KM (BCA) UCL 0.231


Maximum 0.709




95% KM (t) UCL 0.232



Mean 0.219




nu star 1704


Theta Star 0.0288




95% t UCL 0.224





Log ROS Method

SD 0.102




Mean 0.184 Mean -1.807


UCL Statistics





-0.693





SD 0.441




Page 17 of 42


General Statistics



Chemical (chromium)






AppChi2 40.06 95% KM (t) UCL 0.233


Theta star 3.709



SD 0.432



95% KM (BCA) UCL 0.584

95% KM (bootstrap t) UCL 0.273Minimum 1E-12

Maximum 3.35


95% KM (t) UCL





Theta Star 0.938

nu star 20.05






95% t UCL 0.222






0.257

-1.346



SD 0.242 SD

0.713

Mean 0.279 Mean






Maximum 58.5

0.233








UCL Statistics



Page 18 of 42




Lilliefors Test Statistic 0.474 Lilliefors Test Statistic











Chemical (chrysene)

General Statistics

Number of Detected Data 151Number of Valid Data 279



















nu star 2409



MLE of Mean 8.941


99% Chebyshev (MVUE) UCL 11.24 95% Modified-t UCL (Johnson-1978) 9.547


97.5% Chebyshev (MVUE) UCL 10.33 95% Adjusted-CLT UCL (Chen-1995) 9.644








Skewness 4.801

SD 5.553




0.12





UCL Statistics


Theta Star 1.804



Page 19 of 42




0.1


Skewness 13.93


SD 8.836




Minimum 0.618 Minimum of Log Data -0.481



General Statistics



Chemical (cobalt)








Theta star 553.6



SD 312.2

Median 0.085 95% KM (Chebyshev) UCL 111






95% KM (t) UCL



Theta Star 316.2







95% t UCL 60.31



4.121




SD in Log Scale


2.869







Lilliefors Test Statistic 0.32 Lilliefors Test Statistic

60.36



nu star 52.08

N/A Log ROS Method

Mean 29.52 Mean -2.342

SD 311.7 SD

Page 20 of 42









nu star 846


16.09


Theta Star 8.057







Skewness 5.343


SD 18.8






Chemical (copper)


General Statistics













Anderson-Darling Test Statistic 4.115E+28 95% Bootstrap-t UCL 9.832






nu star 1866

MLE of Mean 6.945




MLE of Mean 14.03




95% Modified-t UCL (Johnson-1978)







Theta Star 1.809


Page 21 of 42


279 56

51 223

79.93%

0.02 -3.912

16 2.773

2.187 -0.893

3.588 2.116

0.01 -4.605

1000 6.908

279

0

100.00%

0.289 0.122

0.118 0.118

4.15 -3.308

42.25 2.195

8.325 0.632

N/A

-6.664

4.042

0.442

1.821

0.621

0.628

0.665

0.385

5.684

43.08

1.772

0.841

0.841 0.464

0.128 1.825

0.111

0.648

0.647

0.646

1E-12 0.705

16 0.663

1.707 0.661

Maximum 95% KM (BCA) UCL

Minimum 95% KM (bootstrap t) UCL

95% KM (z) UCLAssuming Gamma Distribution

Gamma ROS Statistics using Extrapolated Data 95% KM (jackknife) UCL

95% KM (t) UCL

Mean

SE of MeanData not Gamma Distributed at 5% Significance Level

5% K-S Critical Value SD

k star (bias corrected) Data do not follow a Discernable Distribution (0.05)

Theta Star

95% BCA Bootstrap UCL

Mean in Original Scale

SD in Log Scale


Mean in Log ScaleMLE method failed to converge properly

Log ROS Method

95% DL/2 (t) UCL 95% H-Stat (DL/2) UCL

SD SD

Mean Mean






Number treated as Non-DetectNote: Data have multiple DLs - Use of KM Method is recommended

Single DL Non-Detect Percentage

For all methods (except KM, DL/2, and ROS Methods), Number treated as Detected

Maximum Non-Detect

Minimum Non-DetectMinimum Non-Detect

Maximum Non-Detect

Maximum Detected

SD of Detected SD of Detected

Mean of Detected

Percent Non-Detects

General Statistics

Number of Detected Data

Number of Distinct Detected Data Number of Non-Detect Data

Number of Valid Data

Chemical (dibenz(a,h)anthracene)




Use 95% Chebyshev (Mean, Sd) UCL 19.28Potential UCL to Use





Mean 95% KM (Percentile Bootstrap) UCL


5% A-D Critical Value Kaplan-Meier (KM) Method

A-D Test Statistic

K-S Test Statistic

nu star



95% t UCL

SD in Original Scale

UCL Statistics





Mean of Detected


Minimum Detected Minimum Detected

Maximum Detected




Page 22 of 42

ON-SITE SOILS (0-10 FEET BGS)1.699 0.948

1.862 1.157

0.18 1.569

9.506

100.2

78.11 1.157

2.19

2.193

95% KM (BCA) UCL 296.3Maximum 20000

95% KM (bootstrap t) UCL 3877


Minimum 1E-12



95% KM (t) UCL 250.3

Mean 118.6



nu star 49.71





Theta Star 1331




95% t UCL 250.1






Mean 118.6 Mean -1.801

SD 1331 SD 3.241


UCL Statistics










SD of Detected 1718








General Statistics


Chemical (fluoranthene)







Potential UCLs to UseNu star

AppChi2 97.5% KM (Chebyshev) UCL

Theta star

k star 99% KM (Chebyshev) UCL

SD 97.5% KM (Chebyshev) UCL






95% KM (Chebyshev) UCLMedian

Page 23 of 42





95% KM (t) UCL 13.7


SD



nu star 10.03


Theta Star 293.7




95% t UCL 13.56







SD 88.89 SD 2.078



UCL Statistics











Chemical (fluorene)

General Statistics









Theta star 2085




SD 1331

95% KM (Percentile Bootstrap) UCL 261.7Mean 118.8

83.67



Mean 7.244 Mean -3.456




Data not Normal at 5% Significance Level







Page 24 of 42


279 154

112 125

44.80%

0.01 -4.605

7500 8.923

75.21 -0.0497

637.7 2.677

0.01 -4.605

0.33 -1.109

183

96

65.59%

0.468 0.0863

0.0714 0.0714

41.52 -2.092

474.6 3.036

88.41 27.34

N/A

-3.073

4.204

41.52

474.6

88.41

87.61

139.7

0.173

434.1

53.37

19.2

0.955

0.955 41.52

0.0849 473.7

28.45

88.48

88.32

88.41

95% KM (z) UCLAssuming Gamma Distribution

Gamma ROS Statistics using Extrapolated Data 95% KM (jackknife) UCL

95% KM (t) UCL

Data not Gamma Distributed at 5% Significance Level SE of Mean

SD

A-D Test Statistic Nonparametric Statistics

5% A-D Critical Value Kaplan-Meier (KM) Method

nu star

k star (bias corrected) Data do not follow a Discernable Distribution (0.05)

Theta Star




95% t UCL


Mean in Original Scale

SD in Log Scale

Mean in Log ScaleMLE yields a negative mean



SD SD



UCL Statistics


Number treated as DetectedFor all methods (except KM, DL/2, and ROS Methods),

Single DL Non-Detect PercentageObservations < Largest ND are treated as NDs

Number treated as Non-DetectNote: Data have multiple DLs - Use of KM Method is recommended

Minimum Non-Detect Minimum Non-Detect

SD of Detected SD of Detected

Maximum Detected Maximum Detected

Mean of Detected Mean of Detected


Percent Non-Detects

Number of Valid Data Number of Detected Data

Chemical (indeno(1,2,3-cd)pyrene)

General Statistics










Theta star 168.1

k star 0.295



Median 58.89



K-S Test Statistic Mean

5% K-S Critical Value

Mean Mean

95% DL/2 (t) UCL 95% H-Stat (DL/2) UCL

Data not Lognormal at 5% Significance Level

5% Lilliefors Critical Value 5% Lilliefors Critical Value

Data not Normal at 5% Significance Level


Maximum Non-Detect Maximum Non-Detect

Minimum Detected Minimum Detected

Number of Distinct Detected Data Number of Non-Detect Data

Page 25 of 42

ON-SITE SOILS (0-10 FEET BGS)1E-12 1176

7500 103

47.5 96.04

0.11 165.5

474.7 219.2

0.0644 324.6

737.8

35.93

23.21 219.2

73.53

73.7





99% Chebyshev(Mean, Sd) UCL 1204Assuming Gamma Distribution





Kolmogorov-Smirnov Test Statistic 0.242 95% Percentile Bootstrap UCL 388


Anderson-Darling Test Statistic 4.098E+28 95% Bootstrap-t UCL 1160




nu star 129.8



MLE of Mean 184.4


Theta Star 693.4










Skewness 15.1



SD 1601




Chemical (lead)

General Statistics







Nu star Potential UCLs to Use

AppChi2 97.5% KM (Chebyshev) UCL

99% KM (Chebyshev) UCL

Theta star

k star

95% KM (Chebyshev) UCL

SD 97.5% KM (Chebyshev) UCL

Median

Mean 95% KM (Percentile Bootstrap) UCL

Maximum 95% KM (BCA) UCL

Minimum 95% KM (bootstrap t) UCL


122.6


95% UCLs (Adjusted for Skewness) 95% Chebyshev (MVUE) UCL



Page 26 of 42



AppChi2 27.66 95% KM (t) UCL 0.58

Theta star 461.8




Maximum 296.1

Median 3.109



95% KM (z) UCL 0.579


Mean 0.214





Theta Star 42.67

nu star 2.789





95% t UCL 0.556





SD 3.478 SD 1.542

Mean 0.238 Mean -6.602



UCL Statistics


















General Statistics



Chemical (m,p-xylene)

95% KM (BCA) UCL 0.64



95% KM (t) UCL 0.58

3.473









Page 27 of 42



Theta star 0.788




Maximum 2.77

Median 0.14



95% KM (z) UCL 0.0586


Mean 0.0387





Theta Star 0.37

nu star 28.62





95% t UCL 0.0629





SD 0.178 SD 0.52

Mean 0.0586 Mean -3.149











General Statistics



Chemical (mercury)






95% KM (BCA) UCL 0.0633



95% KM (t) UCL 0.0587

0.181




UCL Statistics





-2.303


Maximum Non-Detect 0.1 Maximum Non-Detect




Page 28 of 42


Theta star 1.508




Maximum 22.2

Median 1.669



95% KM (z) UCL 0.697


Mean 0.488





Theta Star 4.299

nu star 40.85





95% t UCL 0.661





SD 1.926 SD 0.86

Mean 0.469 Mean -1.784











General Statistics



Chemical (molybdenum)






AppChi2 64.07 95% KM (BCA) UCL 0.0633

95% KM (BCA) UCL 0.734



95% KM (t) UCL 0.698

1.931




UCL Statistics





-0.693


Maximum Non-Detect 0.5 Maximum Non-Detect




Page 29 of 42





Maximum 23000

Median 182.8


Minimum 0.016 95% KM (bootstrap t) UCL 3444

95% KM (z) UCL 227.4


Mean 91.33





Theta Star 1681

nu star 30.3





95% t UCL 227.4





SD 1378 SD 2.726

Mean 93.12 Mean -2.634











General Statistics



Chemical (naphthalene)







AppChi2 508.8 95% KM (BCA) UCL 0.734

95% KM (BCA) UCL 255.9



95% KM (t) UCL 227.9

1378



0.0845 5% Lilliefors Critical Value 0.0845

UCL Statistics





6.908


Maximum Non-Detect 1000 Maximum Non-Detect




Page 30 of 42



Number of Detected Data 5Number of Valid Data 279


Chemical (o-xylene)

General Statistics




Use 95% Chebyshev (Mean, Sd) UCL 116.8Potential UCL to Use





95% Chebyshev(Mean, Sd) UCL 116.8


Data not Gamma Distributed at 5% Significance Level



Anderson-Darling Test Statistic 4.115E+28 95% Bootstrap-t UCL 189.7

Adjusted Chi Square Value 186.1 95% Jackknife UCL

MLE of Mean 37.57

nu star 219.6

MLE of Standard Deviation


Theta Star 83.15



21.61


95% Student's-t UCL

95% UCLs (Adjusted for Skewness)

95% Adjusted-CLT UCL (Chen-1995) 85.6 97.5% Chebyshev (MVUE) UCL


Skewness 14.57







General Statistics



Chemical (nickel)








Theta star 1188




67.56


55.89


67.56 95% H-UCL 16.83





SD 283.2


Page 31 of 42








AppChi2 38.2 95% KM (t) UCL 0.197


Theta star 37.93

0.307


Median 4.832

95% KM (jackknife) UCL

Maximum 19 95% KM (BCA) UCL

0.778



nu star 2.112



95% t UCL 0.183





SD 1.156 SD 1.704











Maximum Non-Detect 1.609Maximum Non-Detect 5








Raw Statistics




19

Mean 3.678 95% KM (Percentile Bootstrap) UCL

0.178


95% KM (t) UCL 0.197


Mean 0.0711



K-S Test Statistic

18.6



Theta Star


Mean 0.0949 Mean -7.128


0.571 Shapiro Wilk Test Statistic 0.982


UCL Statistics



Page 32 of 42








k star 0.231

Nu star 128.7

Theta star 508.8


Minimum 0.012 95% KM (bootstrap t) UCL 2439




95% KM (t) UCL 185.9

0.995



nu star 45.73


Theta Star 1103


185.8


SD in Log Scale

95% t UCL



SD 965.7









SD of Detected 1293





Raw Statistics



General Statistics



Chemical (phenanthrene)




Mean 90.39




K-S Test Statistic




4.679



SD 3.143

Mean 90.39 Mean -2.17


0.0712

UCL Statistics



5% Lilliefors Critical Value 0.0712

Page 33 of 42






97.5% KM (Chebyshev) UCL 645.2AppChi2 20.59

Theta star 2134



SD 1390



Mean 124.9






95% KM (t) UCL 262.4






nu star 51.94


Theta Star 1342





95% t UCL 262.3



Mean -1.674


SD 1390




UCL Statistics







Minimum Detected -4.269Minimum Detected 0.014





General Statistics


Chemical (pyrene)




SD 3.292



Mean 124.9






Page 34 of 42








AppChi2 112.8 95% KM (t) UCL 0.271

Theta star 1.262










95% KM (t) UCL 0.271





nu star 24.76


Theta Star 0.601




95% t UCL 0.261







SD 0.227 SD 0.303

Mean 0.149 Mean -2.022





UCL Statistics











Chemical (silver)


Number of Distinct Detected Data 11 Number of Non-Detect Data




231

General Statistics


Page 35 of 42








Theta star 0.427







Theta Star 0.367

nu star 11.54






95% t UCL 0.0159



-12.25

Log ROS Method



MLE method failed to converge properly Mean in Log Scale

95% DL/2 (t) UCL 2.407

SD 1.808

Mean -6.983Mean 0.928

SD 14.97















General Statistics



Chemical (toluene)



k star 0.168


95% KM (BCA) UCL 0.0163


Maximum 0.99


95% KM (t) UCL 0.0168


95% H-Stat (DL/2) UCL 0.00653

0.918

UCL Statistics







Page 36 of 42




95% KM (t) UCL







95% KM (t) UCL 1.519






nu star 53.64



95% t UCL 1.213





Log ROS Method


SD 2.261 SD 1.016

Mean 0.984 Mean -0.93






UCL Statistics











General Statistics



Chemical (total cyanide)



1.519

Theta star 38.78


AppChi2 87.36




Median 14.68



Theta Star 3.719






Minimum Detected

Page 37 of 42



1715





Theta star 13752

Median 130 95% KM (Chebyshev) UCL 1636


95% KM (BCA) UCL 1106

95% KM (bootstrap t) UCL 1399Minimum 1E-12

Maximum 42000


Gamma ROS Statistics using Extrapolated Data 95% KM (jackknife) UCL 1090


95% KM (t) UCL 1091





Theta Star 4273

nu star 98.82





95% t UCL 1089

MLE yields a negative mean Mean in Log Scale 2.652




SD 3354 SD 2.662


Mean 757.8 Mean 3.221






UCL Statistics


1.609


Maximum Detected

Minimum Non-Detect 5 Minimum Non-Detect



General Statistics


Chemical (tph-d)





99% KM (Chebyshev) UCL 2760


k star 0.086

1231






10.65


Minimum Detected 5.4 Minimum Detected 1.686

Raw Statistics

Maximum Detected 42000

Page 38 of 42


428


Theta star 5429

Median 1E-12 95% KM (Chebyshev) UCL 88.55


95% KM (BCA) UCL 50.98

95% KM (bootstrap t) UCL 104.5Minimum 1E-12

Maximum 2800




95% KM (t) UCL 49.86





Theta Star 1463

nu star 10.01





95% t UCL 49.66





SD 235.6 SD 1.667


Mean 26.49 Mean -1.401






UCL Statistics









Maximum Detected 7.937Maximum Detected 2800


Minimum Detected -4.343Minimum Detected 0.013



General Statistics


Chemical (tph-g)






k star 0.0466

63.06



1.609


Maximum Non-Detect 5 Maximum Non-Detect

Page 39 of 42






AppChi2 46.46 95% KM (Chebyshev) UCL 2421

Theta star 32040

k star 0.114 99% KM (Chebyshev) UCL 3755


Maximum 35000 95% KM (BCA) UCL 1806


Gamma ROS Statistics using Extrapolated Data 95% KM (jackknife) UCL 1770

Assuming Gamma Distribution 95% KM (z) UCL 1773


K-S Test Statistic 0.832 Mean 1381

nu star 118


95% t UCL 1772



Mean in Original Scale 1379

Mean in Log Scale 3.969MLE yields a negative mean




SD 2.389

Mean 4.432Mean 1377

SD 3979





Data not Lognormal at 5% Significance LevelData not Normal at 5% Significance Level




Minimum Non-Detect 25 Minimum Non-Detect 3.219

SD of Detected 5387




General Statistics



Chemical (tph-mo)




2421


Median 1121 95% KM (Chebyshev) UCL

95% KM (t) UCL 1775







Theta Star 6483


UCL Statistics





Minimum Detected 19 Minimum Detected 2.944

Mean of Detected 2876

Page 40 of 42


SD 56.68






Chemical (zinc)


General Statistics




Potential UCL to Use Use 95% Student's-t UCL 34

or 95% Modified-t UCL





95% Percentile Bootstrap UCL 34.04Kolmogorov-Smirnov Test Statistic 0.0888





Adjusted Chi Square Value 2759 95% Jackknife UCL 34



32.26

nu star 2883





95% Student's-t UCL 34 95% H-UCL 33.59







Skewness 4.18


SD 16.42







General Statistics

Number of Valid Observations 243 Number of Distinct Observations



34.05

42.75


Assuming Gamma Distribution 99% Chebyshev(Mean, Sd) UCL


Theta Star 5.438


MLE of Mean

184

Chemical (vanadium)

Page 41 of 42















Adjusted Chi Square Value 1008




nu star 1084


MLE of Mean 56.05



Theta Star 25.12












Skewness 5.013


95% Jackknife UCL 62.05


Page 42 of 42


IRIS ENVIRONMENTAL

ATTACHMENT D

MODELING METHODOLOGIES


D-1 IRIS ENVIRONMENTAL

ATTACHMENT D MODELING METHODOLOGIES

D.1 Introduction

The conceptual Site model for the former Lodi Manufactured Gas Plant site, located in Lodi, California (“the Site”), includes the inhalation of vapor-phase chemicals in indoor and outdoor air, and the inhalation of particulate-phase chemicals in outdoor air as potentially complete exposure pathways to be evaluated in the human health risk assessment (HRA). These exposure pathways require the transport of chemicals of potential concern (COPCs) from the impacted medium (soil gas or soil) to the exposure medium (indoor or outdoor air), where persons may be potentially exposed to the COPCs via the inhalation route. Given the presence of current off-site populations, as well as the presence of potential future on-site populations that may be exposed to Site-related chemicals, and the assumption of several potential exposure scenarios, there are three distinct transport pathways that involve the movement of COPCs from one medium to another:

1) transport of vapor-phase COPCs from on-site soil gas to on-site indoor air, where future on-site residential populations may be exposed;

2) transport of vapor-phase COPCs from on-site soil gas to on-site outdoor air where current off-site commercial and residential, and future on-site residential populations may be exposed; and

3) transport of particulate-phase COPCs from on-site soil to on-site outdoor air, where current off-site commercial and residential, and future on-site residential populations may be exposed.

Current off-site commercial and residential populations are conservatively assumed to work or reside directly at the boundaries of the Site and are assumed to be exposed to the predicted on-site outdoor vapor- and particulate-phase COPC concentrations. However, the concentrations to which off-site populations are potentially exposed would be lower than on-site concentrations due to dispersion.

To account for the outdoor air vapor inhalation exposure pathway in the development of soil risk-based screening concentrations (RBSCs) for volatile chemicals, a fourth distinct transport pathway that involves the transport of vapor-phase COPCs from on-site soil to on-site outdoor air, is also described in this Attachment.

This Attachment describes the methodologies employed to model the transport of chemicals from one medium to another for each of the transport pathways listed above.

The subsurface transport of a COPC is governed by soil and source properties and by the physicochemical properties of the chemical. Chemical properties that influence transport include its diffusivity in air, diffusivity in water, Henry’s law constant, solubility in water, and organic carbon partitioning coefficient. Physiochemical properties for COPCs in soil gas and their sources are documented in Table D-1. As Site-specific values were



not available, default soil parameter values were conservatively used for modeling the transport of vapor-phase COPCs from on-site soil gas to on-site indoor and outdoor air, as presented in Table D-2.

D.2 Vapor-Phase Transport from On-site Soil Gas to On-site Indoor Air

Volatile chemicals present in the subsurface beneath the Site have the potential to volatilize from soils and migrate up through the soil column and into the indoor air space of buildings, where future on-site residents may be exposed via inhalation. This transport phenomenon is referred to as “vapor intrusion” and is discussed in Section 4.5.2 of the HRA.

The transport of a volatile chemical from soil gas to indoor air is represented by the attenuation coefficient, or alpha (α). By definition, the attenuation coefficient represents the ratio of the chemical concentration in indoor air (attributable to vapor intrusion) to the chemical concentration in soil gas beneath the building. Thus, the concentration of a volatile chemical in indoor air may be expressed as a function of the chemical concentration in soil gas and the attenuation coefficient:

αCC sgia ×= (Eq. D-1)

where:

Cia = chemical concentration in indoor air (µg/m3); and

Csg = chemical concentration in soil gas (µg/m3).

α = attenuation coefficient (unitless);

The transport of volatile COPCs from soil gas to indoor air was modeled using the USEPA-recommended Johnson & Ettinger Model for soil gas (SG-SCREEN Version 2.0), as modified by the California Environmental Protection Agency (Cal/EPA) Department of Toxic Substances Control (DTSC) (USEPA, 2004; Cal/EPA, 2009). As recommended by DTSC (Cal/EPA, 2005), soil gas, rather than soil data, were used to evaluate the vapor intrusion pathway, because soil gas data represent a direct measurement of the volatile chemical that has the potential to migrate into indoor air.

Inputs to the Johnson and Ettinger Model include: soil type and lithology, depth of soil gas contamination, physicochemical properties of the COPCs, and building parameters.

Physicochemical properties of the COPCs are presented in Table D-1; this table also presents corrected (to soil temperature) Henry’s Law constants and effective diffusivities of the COPCs, as calculated by the Johnson and Ettinger Model. Model default values for soil temperature, dry bulk density, total porosity, and water-filled porosity were used as soil input parameters and model defaults for building parameters were also used. The soil and building parameters used in the Johnson and Ettinger Model are summarized in Table D-2.



Volatile chemicals detected in Site soil gas which were included in the Johnson & Ettinger Model analysis of the vapor intrusion pathway were:

• 1,1-Difluoroethane • 1,2,4-Trimethylbenzene • 1,3,5-Trimethylbenzene • 2-Butanone (MEK) • 2-Hexanone • 4-Ethyltoluene • Acetone • Benzene • Carbon disulfide • Isopropylbenzene (cumene) • Ethanol • Dichlorodifluoromethane (Freon 12) • Ethylbenzene • Heptane • Methyl tert-butyl ether (MTBE) • Naphthalene • Propylbenzene • Styrene • Tetrachloroethene • Toluene • Trichlorofluoromethane (Freon 11) • Trichloroethene • Total xylenes

For those VOCs detected in at least one Site soil gas sample, the maximum detected concentration at each sampled depth of each soil gas sampling location was input into the Johnson and Ettinger Model; for sampling locations where a VOC was not detected (but detected elsewhere), one-half the detection limit was input into the Model. In this way, worst-case concentrations of chemicals in the indoor air space of future on-site buildings and the maximum potential health risks to future on-site residents associated with inhalation exposure to the COPCs present in indoor air were estimated. Maximum risks were calculated for each location where detected VOCs were sampled in soil gas.

The attenuation factors estimated from the Johnson & Ettinger Model for the residential scenario are provided in Table D-3 and the chemical concentrations in indoor air for soil gas COPCs are presented in Table 23 of the HRA for the future onsite residential scenario.



D.3 Vapor-Phase Transport from On-site Soil Gas to On-site Outdoor Air

Volatile chemicals present in the subsurface beneath the Site have the potential to volatilize from soils and migrate up through the soil column and into outdoor air, where current off-site and future on-site populations may be exposed via inhalation. As with indoor air, it is preferable to estimate the transport of vapor-phase chemicals from the subsurface to outdoor air using soil gas data (rather than soil or groundwater data), as soil gas data represent the most direct measurement of the contaminants that may potentially migrate to outdoor air; this preferred approach was used in estimating outdoor vapor exposures for all receptors. This transport of on-site soil gas to on-site outdoor air is similar to vapor intrusion, described above in Section D.2, except the chemicals are emitted and dispersed into outdoor air rather than indoor air. COPCs for the soil gas-to-outdoor air pathway are the same as those defined above in Section D.2.

The transport of a volatile chemical from soil gas to outdoor air is represented by the transfer factor (TF). Analogous to the attenuation factor, discussed above, the transfer factor represents the ratio of the chemical concentration in outdoor air (attributable to transport from soil gas) to the chemical concentration in soil gas. Thus, the concentration of a volatile chemical in outdoor air may be expressed as a function of the chemical concentration in soil gas and the transfer factor:

TFCC SGOA ×= (Eq. D-2)

where:

COA = chemical concentration in outdoor air (µg/m3);

CSG = chemical concentration in soil gas (µg/m3); and

TF = transfer factor (unitless).

As described in the following sections below, the transfer factor incorporates two distinct processes: the diffusive transport of volatile chemicals from soil gas to the ground surface; and the dispersion of volatile chemicals from the ground surface into the ambient air. The transfer factors estimated for COPCs in soil gas are provided in Table D-5 and the chemical concentration in outdoor air for soil gas COPCs are presented in Tables 21 and 22 of the HRA for residential and commercial scenarios, respectively.

For those VOCs detected in at least one Site soil gas sample, the maximum detected concentration at each of the soil gas sampling locations was input into the soil gas to outdoor air transport model described below; for sampling locations where a VOC was not detected (but detected elsewhere), one-half the detection limit was input into the model. Estimates of the worst-case concentrations of chemicals in the outdoor air at each location across the Site were thus calculated. Then, the average total risks from the inhalation of VOC vapors in outdoor air from all soil gas sources across the Site was calculated by averaging the maximum risks for all detected VOCs in soil gas from each location across the Site.



D.3.1 Transfer Factor Methodology

The transfer factor incorporates two distinct processes: the diffusive transport (i.e., flux) of volatile chemicals from at-depth soil gas to the ground surface; and the dispersion of volatile chemicals from the ground surface into the ambient air. The steady-state diffusive flux of each COPC from soil gas to the ground surface was estimated using the approach recommended in Standard Guide for Risk-based Corrective Action Applied at Petroleum Release Sites (ASTM, 1995):

CF2CF1d

CDQ SGeffV

ss ×××

= (Eq. D-3)

where:

Qss = steady state flux from subsurface vapor source (g/m2/s);

CSG = chemical concentration in soil gas (µg/m3);

DeffV = vadose zone effective diffusion coefficient (cm2/s);

d = depth of soil gas sample (m);

CF1 = area conversion factor, 10-4 m2/cm2; and

CF2 = mass conversion factor, 103 g/kg.

This flux model requires that there are no non-aqueous phase liquids (NAPLs) present. If this model were used to estimate the flux of NAPLs, the flux would be overestimated. The presence of NAPLs has not been identified at the Site in the areas where soil gas samples were collected.

The concentration of each COPC in outdoor air was modeled using the “Q over C” dispersion-factor approach recommended in the Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites (USEPA, 2002):

vol

ssOA (Q/C)

QC = (Eq. D-4)

where:

(Q/C)vol = dispersion factor for volatiles (g/m2/s per kg/m3).

Combining Equations D-2, D-3, and D-4 yields:

g/kg10/cmm10Q/C)(d

DTF 3224

vol

effV ×××

= − (Eq. D-5)

The dispersion factor [(Q/C)vol] represents the reciprocal of the ratio of the annual-average geometric mean air concentration at the center of a square source area to the



emission flux from that source area. The dispersion factor for the Site was estimated as recommended in the Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites (USEPA, 2002). The dispersion factor is a function of the source area and of empirical coefficients which are based on air dispersion modeling for specific climate zones (USEPA, 2002). The source area used to estimate the dispersion factor was the Site area of 0.73 acres. Default dispersion coefficients specific to the Site region (San Francisco area) were used (USEPA, 2002). Calculation of the dispersion factor is documented in Table D-4.

D.4 Particulate-Phase Transport from On-site Soil to On-site Outdoor Air

Non-volatile chemicals present in onsite soils (i.e., adhered to soil particles) have the potential to be emitted into the ambient air via wind erosion of impacted soils, where current off-site commercial workers, current off-site residents, or future on-site residents may be exposed via inhalation. As presented in Tables 7 and 8 of the HRA, COPCs for the soil-to-outdoor air pathway include as many as: 5 volatile chemicals; 18 polycyclic aromatic hydrocarbons (PAHs); and 17 inorganics.

The transport of particulate-phase chemicals from soil to outdoor air is represented by the particulate emission factor (PEF). The particulate emission factor represents the ratio of the chemical concentration in soil to the chemical concentration in outdoor air (attributable to transport from soil). Thus, the particulate-phase concentration of a chemical in outdoor air may be expressed as a function of the chemical concentration in soil and the particulate emission factor:

PEF1CC SpOA, ×= (Eq. D-6)

where:

COA,p = particulate-phase chemical concentration in outdoor air (mg/m3);

CS = chemical concentration in soil (mg/kg); and

PEF = particulate emission factor (m3/kg).

As defined, the particulate emission factor is effectively equal to the reciprocal of the dust concentration in air. Unlike the attenuation factor and transfer factor discussed above, the particulate emission factor is not chemical-specific. The particulate emission factor incorporates two distinct processes: the wind erosion of impacted particulate matter (i.e., dust) from the ground surface, and the dispersion of the particulate matter into the ambient air. The particulate emission factor for the Site was estimated using the approach recommended in the Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites (USEPA, 2002). The flux of impacted particulate matter from the ground surface was estimated using USEPA-recommended default values for all input parameters. The dispersion of particulate matter into onsite outdoor air was estimated using a site-specific particulate matter dispersion factor [(Q/C)wind], analogous to the



volatile dispersion factor discussed above. Calculation of the particulate emission factor is documented in Table D-6 and predicted particulate-phase chemical concentrations in outdoor air for COPCs in soils are presented in Tables 7 and 8 of the HRA for exposed soils (0-0.5 feet bgs) and on-site soils (0-10 feet bgs), respectively.

D.5 Vapor-Phase Transport from On-site Soil to On-site Outdoor Air

To develop a multi-pathway RBSC for volatile chemicals detected in soil, the transport of vapor-phase COPCs in on-site soils to on-site outdoor air needs to be predicted. The transport of volatile COPCs from soil to outdoor air was modeled as two distinct processes: the volatilization of chemicals from soil to the ground surface, and the dispersion of the chemicals from the ground surface into the ambient air. These two distinct processes are described further below.

D.6.1 Volatilization Flux Methodology

The transport of volatile COPCs from soil into outdoor air was modeled using the approach recommended in the USEPA soil screening guidance (USEPA, 1996) for infinite sources:

Ab

22-41/2Avol

Dρ 2)/cm(m 10 T) D (3.14Q/CVF

××××××

= (Eq. D-7)

where:

TSawb

2w

10/3wi

10/3a

A H'θ+ θ + Kdρ )]/ηD(θ + )H' D[(θD =

And where:

VF = volatilization factor (m3/kg);

Q/Cvol = dispersion factor (g/m2/s per kg/m3);

T = exposure interval (based on exposure duration) (s);

ρb = dry soil bulk density (g/cm3);

η = total soil porosity (cm3pore/cm3soil);

ρb = dry soil bulk density (g/cm3);

θa = air-filled soil porosity (cm3air/cm3soil - calculated, η-θw);

θw = water-filled soil porosity (cm3water/cm3soil);

Di = diffusivity in air (chemical-specific, cm2/s);

H’ = Henry's Law Constant (chemical-specific, unitless);

Dw = diffusivity in water (chemical-specific, cm2/s); and

Kd = soil-water partition coefficient (chemical specific, g/cm3);



where:

Kd = Koc x foc

And where:

Koc = soil organic carbon partition coefficient (chemical-specific, g/cm3); and

foc = fraction organic carbon in soil (g/g);

For mass-limited sources, the following equation is used to model transport of volatile COPCs from soil into outdoor air:

224sb

vol

/mcm10dρTQ/CVF

×××

= (Eq. D-8)

where:

VF = volatilization factor (m3/kg);

Q/Cvol = dispersion factor (g/m2/s per kg/m3);

T = exposure interval (based on exposure duration) (s);

ρb = dry soil bulk density (g/cm3); and

ds = average source depth (Site-specific) (cm).

The dispersion factor [(Q/C)vol] represents the reciprocal of the ratio of the annual-average geometric mean air concentration at the center of a square source area to the emission flux from that source area and is the same volatile dispersion factor discussed in Section D.3.1 above.

USEPA-recommended conservative default values were used in calculating the volatilization factor; these input parameters are presented in Table D-7. Table D-8 presents the infinite source VF for volatile compounds in on-site soils for the future residential scenario. The infinite source assumption VF is used in the development of soil RBSCs for volatile chemicals. Example calculations of the VF for naphthalene for the future residential scenario are provided in Attachment F.



D.7 References

American Society for Testing and Materials (ASTM). 1995. Standard Guide for Risk-Based Corrective Action Applied at Petroleum Release Sites. Designation: E 1739-95.

Cal/EPA. 2009. Johnson and Ettinger SG-SCREEN Model, EPA Version 2.0, dated April 2003, as modified by DTSC February 4.

Cal/EPA. 2005. Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air. Department of Toxic Substances Control. Interim Final. February 2.

USEPA. 2004. User’s Guide for Evaluating Subsurface Vapor Intrusion into Buildings. Office of Emergency and Remedial Response Washington, D.C. Revised February 22, 2004.

USEPA. 2002. Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. Office of Solid Waste and Emergency Response. Washington, D.C. OSWER/9355.4-24. December.

USEPA. 1996. Soil Screening Guidance: User’s Guide. Office of Solid Waste and Emergency Response. Washington, D.C. EPA/540/R-96/018. July.


IRIS ENVIRONMENTAL

ATTACHMENT D

TABLES

Volatile Organic Compounds

1,1-Difluoroethane 1.0E-01 2 1.2E-05 2 2.0E-02 2 8.3E-01 2 NONE 1 NONE 1 NONE 1 NONE J&E 2.0E-02 J&E 8.3E-01 J&E 8.0E-03 J&E

1,2,4-Trimethylbenzene 6.1E-02 1 7.9E-06 1 6.1E-03 1 2.5E-01 1 9.4E+03 1 4.4E+02 1 6.5E+02 1 1.2E+04 J&E 5.8E-03 J&E 2.4E-01 J&E 4.7E-03 J&E

1,3,5-Trimethylbenzene 6.0E-02 1 8.7E-06 1 5.9E-03 1 2.4E-01 1 9.3E+03 1 4.4E+02 2 6.4E+02 1 1.1E+04 J&E 5.5E-03 J&E 2.3E-01 J&E 4.7E-03 J&E

2-Butanone (Methyl Ethyl Ketone 8.1E-02 1 9.8E-06 1 5.6E-05 1 2.3E-03 1 7.5E+03 3.5E+02 1 5.4E+02 8.2E+03 J&E 5.3E-05 J&E 2.2E-03 J&E 6.3E-03 J&E

2-Hexanone 7.0E-02 2 8.4E-06 2 9.3E-05 2 3.8E-03 2 NONE 1 4.0E+02 2 NONE 1 NONE J&E 9.3E-05 J&E 3.8E-03 J&E 5.5E-03 J&E

4-Ethyltoluene 6.8E-02 3 7.8E-06 4 5.0E-03 3 2.1E-01 3 NONE 1 4.3E+02 1 NONE 1 NONE J&E 5.0E-03 J&E 2.1E-01 J&E 5.3E-03 J&E

Acetone 1.2E-01 1 1.1E-05 1 3.9E-05 1 1.6E-03 1 7.0E+03 1 3.3E+02 1 5.1E+02 1 7.4E+03 J&E 3.7E-05 J&E 1.5E-03 J&E 9.7E-03 J&E

Benzene 8.8E-02 1 9.8E-06 1 5.5E-03 1 2.3E-01 1 7.3E+03 1 3.5E+02 1 5.6E+02 1 8.0E+03 J&E 5.3E-03 J&E 2.2E-01 J&E 6.9E-03 J&E

Carbon Disulfide 1.0E-01 1 1.0E-05 1 3.0E-02 1 1.2E+00 1 6.4E+03 1 3.2E+02 1 5.5E+02 1 6.6E+03 J&E 2.9E-02 J&E 1.2E+00 J&E 8.1E-03 J&E

Cumene 6.5E-02 1 7.1E-06 1 1.2E+00 1 4.7E+01 1 1.0E+04 1 4.3E+02 1 6.3E+02 1 1.2E+04 J&E 1.1E+00 J&E 4.4E+01 J&E 5.1E-03 J&E

Ethanol 1.2E-01 3 1.3E-05 4 5.0E-06 3 2.1E-04 3 NONE 1 3.5E+02 1 NONE 1 NONE J&E 5.0E-06 J&E 2.1E-04 J&E 1.0E-02 J&E

Ethylbenzene 7.5E-02 1 7.8E-06 1 7.9E-03 1 3.2E-01 1 8.5E+03 1 4.1E+02 2 6.2E+02 1 1.0E+04 J&E 7.4E-03 J&E 3.0E-01 J&E 5.9E-03 J&E

Freon 11 8.7E-02 1 9.7E-06 1 9.7E-02 1 4.0E+00 1 6.0E+03 1 3.0E+02 1 4.7E+02 1 6.0E+03 J&E 9.4E-02 J&E 3.8E+00 J&E 6.8E-03 J&E

Freon 12 6.7E-02 1 9.9E-06 1 3.4E-01 1 1.4E+01 1 9.4E+03 1 2.4E+02 1 3.8E+02 1 8.0E+03 J&E 3.3E-01 J&E 1.3E+01 J&E 5.2E-03 J&E

Heptane 7.0E-02 3 7.6E-06 4 2.0E+00 3 8.2E+01 3 NONE 1 3.7E+02 1 NONE 1 NONE J&E 2.0E+00 J&E 8.2E+01 J&E 5.5E-03 J&E

Methyl tert-butyl ether 1.0E-01 1 1.1E-05 1 6.2E-04 1 2.6E-02 1 6.7E+03 1 3.3E+02 1 5.0E+02 1 7.1E+03 J&E 6.0E-04 J&E 2.5E-02 J&E 8.0E-03 J&E

Naphthalene 5.9E-02 1 7.5E-06 1 4.8E-04 1 2.0E-02 1 1.0E+04 1 4.9E+02 1 7.5E+02 1 1.3E+04 J&E 4.5E-04 J&E 1.8E-02 J&E 4.6E-03 J&E

Propylbenzene 6.0E-02 1 7.8E-06 1 1.1E-02 1 4.4E-01 1 9.1E+03 1 4.3E+02 1 6.3E+02 1 1.1E+04 J&E 1.0E-02 J&E 4.1E-01 J&E 4.7E-03 J&E

Styrene 7.1E-02 1 8.0E-06 1 2.7E-03 1 1.1E-01 1 8.7E+03 1 4.2E+02 1 6.4E+02 1 1.0E+04 J&E 2.6E-03 J&E 1.1E-01 J&E 5.5E-03 J&E

Tetrachloroethene 7.2E-02 1 8.2E-06 1 1.8E-02 1 7.5E-01 1 8.3E+03 1 3.9E+02 1 6.2E+02 1 9.4E+03 J&E 1.7E-02 J&E 7.1E-01 J&E 5.6E-03 J&E

Toluene 8.7E-02 1 8.6E-06 1 6.6E-03 1 2.7E-01 1 7.9E+03 1 3.8E+02 1 5.9E+02 1 9.0E+03 J&E 6.3E-03 J&E 2.6E-01 J&E 6.8E-03 J&E

Trichloroethene 7.9E-02 1 9.1E-06 1 1.0E-02 1 4.2E-01 1 7.5E+03 1 3.6E+02 1 5.4E+02 1 8.4E+03 J&E 9.8E-03 J&E 4.0E-01 J&E 6.2E-03 J&E

Total Xylenes 8.5E-02 2 9.9E-06 2 5.2E-03 2 2.1E-01 2 8.7E+03 1 4.2E+02 1 6.3E+02 1 1.0E+04 J&E 4.9E-03 J&E 2.0E-01 J&E 6.6E-03 J&E

References:1. USEPA. 2004. User's Guide for Evaluating Subsurface Vapor Intrusion Into Buildings . Office of Emergency and Remedial Response. Washington, D.C. February 22. Available at: http://www.epa.gov/oswer/riskassessment/airmodel/pdf/2004_0222_3phase_users_guide.pdf2. SRC PhysProp Database. 2002. found at http://esc.syrres.com/interkow/physdemo.htm and methods from Schwarzenback R. P. et al. 1993. Environmental Organic Chemistry. John Wiley and Sons, Inc., New York, NY.

TABLE D-1PHYSICOCHEMICAL PROPERTIES



(cm2/s)


Dw

(cm2/s)


Temperature (25° C),H

(atm-m3/mol)

Critical Temperature,

TC

(K)


Temperature, H'

(unitless)

Vadose Zone Effective Diffusion

Coefficient, DeffV

(cm2/s)


Temperature, H'TS

(unitless)

Henry's Law Constant at Average Soil

Temperature, HTS

(atm-m3/mol)

Enthalpy of Vaporization at

Average Soil Temperature,

DHv,TS

(cal/mol)

Enthalpy of Vaporization at

the Normal Boiling Point,

DHv,b

(cal/mol)

Normal Boiling Point,

TB

(K)

PGE_Lodi_J&E Page 1 of 2 IRIS ENVIRONMENTAL

TABLE D-1PHYSICOCHEMICAL PROPERTIES


References:

3. USEPA. 2006. Water9, Version 3. June 29. URL: http://www.epa.gov/ttn/chief/software/water/water9_3.4. United States Environmental Protection Agency (USEPA). 2010. FromUSEPA Regional Screening Levels for Chemical Contaminants at Superfund Sites , December, 2009. Available at: http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/Generic_Tables/pdf/composite_sl_table_run_DECEMBER2009.pdf5. Regional Water Quality Control Board (RWQCB). 2008. Risked Based Screening Levels. Table J. Physio-chemical and Toxicity Constants used in Models. May.J&E = Calculated by Johnson & Ettinger model


Parameter Symbol Residential Units Reference

Building Properties

Depth below grade to bottom of enclosed space floor LF 15 cm DTSC/HERD default (Cal/EPA, 2009)

Building height H 244 cm DTSC/HERD default (Cal/EPA, 2009)

Building area Ab 1.0E+06 cm2 DTSC/HERD default (Cal/EPA, 2009)

Area of enclosed space below grade Ab,sg 1.0E+06 cm2 DTSC/HERD default (Cal/EPA, 2009)

Building air exchange rate AXRb 0.5 hr-1 OEHHA default (Cal/EPA, 2005)

Vapor flow rate into building Qsoil 5 L/min DTSC/HERD default (Cal/EPA, 2009)

Soil Properties

Average soil temperature Ts 24 oC DTSC/HERD default (Cal/EPA, 2009)

SCS soil type Default –Dry bulk density ρb 1.5 g/cm3 Default (USEPA, 2004)

Total porosity η 0.43 cm3/cm3 Default (USEPA, 2004)

Water-filled porosity θw 0.15 cm3/cm3 DTSC/HERD default (Cal/EPA, 2009)

References:Cal/EPA. 2009. Johnson and Ettinger SG-SCREEN Model, EPA Version 2.0, dated April 2003, as modified by DTSC February 4.Cal/EPA. 2005. Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air. Department of Toxic Substances Control. Interim Final. February 2.USEPA. 2004. User’s Guide for Evaluating Subsurface Vapor Intrusion into Buildings. Office of Emergency and Remedial Response Washington, D.C.

TABLE D-2JOHNSON AND ETTINGER MODEL INPUT DATA



Attenuation Factor at 5 ft bgs

Attenuation Factor at 8 ft bgs

Residential Residential

1,1-Difluoroethane 1.0E-03 7.3E-04

1,2,4-Trimethylbenzene 7.2E-04 4.9E-04


2-Butanone (Methyl Ethyl Ketone) 8.8E-04 6.1E-04

2-Hexanone 8.0E-04 5.5E-04

4-Ethyltoluene 7.8E-04 5.4E-04

Acetone 1.1E-03 8.3E-04

Benzene 9.2E-04 6.5E-04

Carbon Disulfide 1.0E-03 7.3E-04

Cumene 7.6E-04 5.2E-04

Ethanol 1.2E-03 8.6E-04

Ethylbenzene 8.3E-04 5.8E-04

Freon 11 9.2E-04 6.5E-04

Freon 12 7.7E-04 5.3E-04

Heptane 8.0E-04 5.5E-04

Methyl tert-butyl ether 1.0E-03 7.3E-04

Naphthalene 7.1E-04 4.8E-04

Propylbenzene 7.2E-04 4.9E-04

Styrene 8.0E-04 5.5E-04

Tetrachloroethene 8.1E-04 5.6E-04

Toluene 9.2E-04 6.5E-04

Trichloroethene 8.6E-04 6.0E-04

Total Xylenes 9.0E-04 6.3E-04

Notes:

1

α = CIA / CSG

where CIA is the chemical concentration in indoor air and CSG is the chemical concentration in soil gas.

2

References:

TABLE D-3ATTENUATION FACTORS


VOCs

Chemical of Potential Concern

Attenuation factors at depth are calculated with the USEPA-recommended Johnson & Ettinger Model for soil gas(SG-SCREEN Version 2.0), as modified by DTSC/HERD (Johnson and Ettinger, 1991; USEPA, 2004; Cal/EPA, 2009), and as modified by Iris Environmental.

By definition, the attenuation factor (α) is the ratio of the chemical concentration in indoor air to the chemical concentration in soil gas beneath the building:

Cal/EPA. 2009. Johnson and Ettinger SG-SCREEN Model, EPA Version 2.0, dated April 2003, as modified by DTSC February 4.Johnson, P.C, and R.A. Ettinger. 1991. Heuristic model for predicting the intrusion rate of contaminant vapors in buildings. Environ. Sci. Technol. 25: 1445-1452.USEPA. 2004. User’s Guide for Evaluating Subsurface Vapor Intrusion into Buildings. Office of Emergency and Remedial Response Washington, D.C. Revised February 22, 2004.


Q/Cvol = A exp[(ln Asite - B)2 (1/C)] = 82.72 (g/m2-s) / (kg/m3)where:

Asite 0.73 acres areal extent of the SiteLocation SF -- General location (USEPA 2002)A 13.8139 -- constant, default value presented in Exhibit D-3 (USEPA 2002)B 20.1624 -- constant, default value presented in Exhibit D-3 (USEPA 2002)C 234.2869 -- constant, default value presented in Exhibit D-3 (USEPA 2002)

References:USEPA. 2002. Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. Office of Solid Waste and Emergency Response. Washington, D.C., December.

Site-specific Dispersion Factor for Volatiles (USEPA 2002, Equation D-1)

TABLE D-4DISPERSION FACTOR CALCULATION FOR VOLATILE COMPOUNDS



Chemical of Potential ConcernTransfer Factor

at 5 ft bgsTransfer Factor

at 8 ft bgs

1,1-Difluoroethane 6.3E-06 3.9E-06



2-Butanone (Methyl Ethyl Ketone) 5.0E-06 3.1E-06

2-Hexanone 4.4E-06 2.7E-06

4-Ethyltoluene 4.2E-06 2.6E-06

Acetone 7.7E-06 4.8E-06

Benzene 5.4E-06 3.4E-06

Carbon Disulfide 6.4E-06 4.0E-06

Cumene 4.0E-06 2.5E-06

Ethanol 8.1E-06 5.0E-06

Ethylbenzene 4.6E-06 2.9E-06

Freon 11 5.4E-06 3.4E-06

Freon 12 4.1E-06 2.6E-06

Heptane 4.3E-06 2.7E-06

Methyl tert-butyl ether 6.3E-06 3.9E-06

Naphthalene 3.6E-06 2.3E-06

Propylbenzene 3.7E-06 2.3E-06

Styrene 4.4E-06 2.7E-06

Tetrachloroethene 4.4E-06 2.8E-06

Toluene 5.4E-06 3.4E-06

Trichloroethene 4.9E-06 3.0E-06

Total Xylenes 5.2E-06 3.3E-06

Notes:1 The methodology used in the calculation of transfer factors, the ratios of the chemical

concentration in outdoor air to the chemical concentration in soil gas, is presented in the text of Attachment D.

Volatile Organic Compounds

TABLE D-5TRANSFER FACTORS FROM SOIL GAS TO AMBIENT AIR



PEF (m3/kg) = = 1.2E+09 m3/kg0.036 x (1-V) x (Um/Ut)

3 x F(x)where:

Q/Cwind 82.72 (g/m2-s) / (kg/m3) dispersion factor (calculated, see below)V 0.5 unitless fraction veg. cover (default from USEPA 2002)Um 4.69 m/s mean annual windspeed (default from USEPA 2002)Ut 11.32 m/s threshold value of windspeed at 7 m (default from USEPA 2002)F(x) 0.194 unitless function dependent on Um/Ut (default from USEPA 2002)

Q/Cwind = A exp[(ln Asite - B)2 (1/C)] = 82.72 (g/m2-s) / (kg/m3)where:

Asite 0.73 acres areal extent of the SiteLocation SF -- General location (USEPA 2002)A 13.8139 -- constant, default value presented in Exhibit D-2 (USEPA 2002)B 20.1624 -- constant, default value presented in Exhibit D-2 (USEPA 2002)C 234.2869 -- constant, default value presented in Exhibit D-2 (USEPA 2002)

References:USEPA. 2002. Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. Office of Solid Waste and Emergency Response. Washington, D.C., December.

Particulate Emission Factor (PEF), (USEPA 2002, Equation 4-5)Q/C x 3600 s/h

Site-specific Dispersion Factor for Particulates (USEPA 2002, Equation D-1)

TABLE D-6PARTICULATE EMISSION FACTOR CALCULATION



TABLE D-7VOLATILIZATION FACTOR EQUATIONS AND SAMPLE CALCULATIONS


VF = Q/Cvol x (3.14 x DA x T)1/2 x 10-4 (m2/cm2) = 7.0E+04 m3/kg Consistent with USEPA 1996, 2 x ρb x DA the larger VF is used to evaluate

where: air concentrations.DA = [(θa

3.33DiH') + (θw3.33Dw)]/η2

ρbKd + θw +θaH'and:

DA 4.66E-06 cm2/s apparent diffusivity (calculated using equation cited above)Q/Cvol 8.27E+01 (g/m2-s) / (kg/m3) dispersion factor (calculated, see below)T 9.46E+08 s exposure interval (based on exposure duration of 30 year)ρb 1.50 g/cm3 dry soil bulk density (default)η 0.43 cm3

pore/cm3soil total soil porosity (default)

θw 0.15 cm3water/cm3

soil water-filled soil porosity (default)θa 0.28 cm3

air/cm3soil air-filled soil porosity (calculated, n-θw)

Di 0.059 cm2/s diffusivity in air (chemical-specific, see Table 14 of HRA)H’ 1.8E-02 unitless

Dw 7.5E-06 cm2/s

Kd =Koc x foc 12 cm3/g

Koc 2000 cm3/gfoc 0.006 g/g

Q/Cvol = A exp[(ln Asite - B)2 (1/C)] = 82.72 (g/m2-s) / (kg/m3)where:

Asite 0.73 acres areal extent of the SiteLocation San Francisco -- General location (USEPA 2002)A 13.8 -- constant, default value presented Exhibit D-2 (USEPA 2002)B 20.2 -- constant, default value presented Exhibit D-2 (USEPA 2002)C 234.3 -- constant, default value presented Exhibit D-2 (USEPA 2002)

References:U.S. Environmental Protection Agency (USEPA). 1996. Soil Screening Guidance: User’s Guide . Office of Solid Waste and Emergency Response. EPA/540/R-96/018. July.USEPA. 2002. Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. Office of Soild Waste and Emergency Response. Washington, D.C., December.

diffusivity in water (chemical-specific, value in Table 14 of HRA adjusted for temperature)

Equation for Dispersion Factor for Volatile Compounds (Equation D-1, USEPA 2002) Future Residential Scenario

Outdoor Air Volatilization Factor (VF) Calculated for Naphthalene, (USEPA 2002, Equation 4-8) Future Residential Scenario

Henry's Law Constant (chemical-specific, see Table 14 of HRA)

soil-water partition coefficient (chemical specific, see Table 14 of HRA)soil organic carbon partition coefficient (chemical-specific, see Table 14 of HRA)fraction organic carbon in soil (default)


Chemicals

Infinite SourceVolatilization Factor

(m3/kg)

1-Methylnaphthalene 7.7E+042-Methylnaphthalene 8.5E+04Acenaphthene 2.7E+05Benzene 6.8E+03Ethylbenzene 6.8E+03Naphthalene 7.0E+04Toluene 6.8E+03m,p-Xylene 6.9E+03o-Xylene 7.6E+03

Future On-site Resident Scenario

Lodi, California

TABLE D-8SOIL TO OUTDOOR AIR

VOLATILIZATION FACTORFormer Lodi Manufactured Gas Plant



IRIS ENVIRONMENTAL

ATTACHMENT E

UNCERTAINTIES IN THE RISK ASSESSMENT


E-1 IRIS ENVIRONMENTAL

ATTACHMENT E UNCERTAINTIES IN THE RISK ASSESSMENT

E.1 Introduction

Risk assessment includes several uncertainties that warrant discussion. Many of the assumptions used in this human health risk assessment (HRA) regarding the representativeness of the sampling data, human exposures, fate and transport modeling, and chemical toxicity are conservative, following agency guidance, and reflect a 90th or 95th percentile value, rather than a typical or average value. The use of several conservative exposure and toxicity assumptions can introduce considerable uncertainty into the risk assessment. By using conservative exposure or toxicity estimates, the assessment can develop a significant conservative bias that may result in the calculation of significantly higher cancer risk or noncancer hazard than is actually posed by the chemicals present in soils and soil gas at the Former Lodi Manufactured Gas Plant Site (the “Site”). A discussion of the key uncertainties used in this evaluation for the Site is discussed below.

E.2 Uncertainties in the Exposure Assumptions

As described below, numerous assumptions must be made in order to estimate human exposure to Site chemicals.

Exposure Assumptions and Pathways

Consistent with recommended Cal/EPA (2005a) default exposure assumptions, we have assumed that future on-site resident populations examined in this HRA are directly exposed to soils on a daily basis, for a continual 30-year exposure period. The assumed exposure duration used in this HRA represents an upper-bound estimate of the total amount of time that an individual may be residing in one location. As the average residential exposure duration in one location is actually less than 30 years, the cumulative exposures and risks presented in this HRA for the future onsite residential scenario likely represent overestimates of the more typical exposures that might be incurred in a residential setting.

Additionally, the estimates of potential health risks for future on-site residents do not account for potential clean soil cover, grass, or other covering that actually would reduce exposure below that assumed in this analysis. Thus, the actual exposures to soils at the Site under possible future residential use would probably be much lower than has been estimated in this assessment.

The selection of complete exposure pathways is another area of uncertainty in all risk assessments. In general, this HRA has quantified all potentially complete exposure pathways through which individuals could become exposed to chemicals present in soils. Accordingly, we believe that the exposure pathways quantified in this HRA capture the



range of even theoretical future exposures, and thus provides a conservative estimate of long-term exposures that could occur at the Site.

Bioavailability of Chemicals in Soil

Another exposure factor that has not been taken into account in this assessment is the bioavialability of chemicals in soil. Studies support that certain organic compounds, particularly highly lipophilic compounds such as carcinogenic polycyclic aromatic hydrocarbons (CPAHs), tend to be tightly bound to soil (Kelsey et al. 1997). This phenomenon can substantially reduce the bioavailability of chemicals to people exposed to chemicals in soils. A reduction in the bioavailability of the chemicals adsorbed to soil would reduce the projected health risk associated with exposure to these soils. Low bioavailability could substantially reduce estimated risks below levels calculated using the default assumption that all chemicals are 100% bioavailable.

Soil Exposure Point Concentrations (EPC)

In accordance with USEPA guidance (USEPA, 2010), 95% UCLs were not calculated for data sets with less than five detections or less than eight samples. Although the USEPA guidance (USEPA, 2010) recommends either the use of the mean or the median in these cases, the maximum detected concentration was conservatively used as the representative EPC. The use of maximum concentrations of chemicals of potential concern (COPCs) detected in soil as the representative EPC will result in an overestimate of the cancer risks and noncancer hazards. For instance, thallium was detected in soils in only 1 out of 243 samples, thus, the maximum detected concentration (i.e. 7.8 mg/kg) was conservatively used as the representative EPC. The EPC is 18-times higher than the mean concentration (i.e. 0.43 mg/kg) for thallium. Therefore, the potential exposure to thallium in soils and associated noncancer HI for thallium (i.e. 1.6) is believed to be overestimated in this HRA and the actual noncancer HI is likely below 1.

Fate and Transport Modeling and Estimated Cancer Risks Associated with Volatile Compounds in Soil Gas Soil Gas to Indoor Air

As recommended by Cal/EPA (2005b), the Johnson and Ettinger SG-SCREEN Model for soil gas was used to estimate potential vapor intrusion risks for the future on-site residential populations in this HRA. The modeling is based on the assumptions that the source of contamination is infinite and fixed in place. Both of these assumptions are conservative for soil sources. First, the actual source of contamination is likely finite and will deplete over time, as volatile chemicals migrate upward through the soil column. This depletion can be further accelerated by biodegradation. Second, as the contamination is depleted, the distance between the source and the building will increase, resulting in decreased transport into the indoor environment. Thus, the actual long-term exposures that may occur at the Site are likely significantly lower than assumed in the calculation of future potential risks, especially if biodegradation is occurring.



The Johnson and Ettinger Model was run using default residential building assumptions under the residential exposure scenario, with an indoor air exchange rate that represents an energy-efficient home. The actual ventilation inside the building may be higher due to open windows and natural ventilation, which will lead to lower indoor air concentrations of chemicals than those predicted by the model. Further, the Johnson and Ettinger model is sensitive to the soil property inputs. Therefore, getting a site conceptual framework that accurately describes site lithology is critical to generating accurate modeling results. No site-specific soil properties were used in the model; instead the conservative model default soil property values were used as model inputs. These conservative source and model assumptions incorporated into the model result in an overestimate of exposure concentrations and actual long-term exposures that may occur at the Site are likely significantly lower than assumed in the calculation of future potential risks.

Soil Gas to Outdoor Air

Many of the uncertainties associated with the fate and transport modeling conducted to estimate the predicted outdoor air concentrations for volatile organic compounds (VOCs) are similar to those associated with modeling of indoor air concentrations. As in the indoor air modeling, the modeling assumes that VOCs in soil are not undergoing biodegradation and the modeling is based on the assumption that there is an infinite source of contamination. Additionally, the modeling of outdoor air concentrations is based on the assumption that only a single chemical is present in the subsurface. When many chemicals are present, these chemicals can interact in ways that reduce the vapor pressure of VOCs available for transport through the vadose zone. These assumptions are all likely conservative.

E.3 Uncertainties in the Toxicity Assessment

Uncertainty in the toxicity assessment arises for those chemicals which rely on animal studies as the basis for determining the appropriate toxicity value. All risk assessments assume that adverse effects observed in animal toxicity experiments would also be observed in humans (animal-to-human extrapolation), and that the toxic effect observed after exposure by one route would occur following exposure by a different route (route-to-route extrapolation).

In order to adjust for uncertainties that arise from the use of animal data, regulatory agencies often base the reference dose for noncarcinogenic effects on the most sensitive animal species (i.e., the species that experiences adverse effects at the lowest dose) and adjust the dose via the use of safety or uncertainty factors. The adjustment compensates for the lack of knowledge regarding interspecies extrapolation and possibility that humans are more sensitive than the most sensitive experimental animal species tested. The use of uncertainty factors is considered to be health protective.

Second, when route-specific toxicity data were unavailable, data were derived by route-to-route extrapolation, and equal absorption rates for both routes were assumed (i.e., oral to inhalation and inhalation to oral). This may or may not reflect the actual differences in



toxicity that can be associated with the route of exposure, but is considered to be a conservative and health-protective assumption. Finally, for dermal exposure to soil, chemical-specific absorption data generally were not available. Instead, dermal absorption rates, which were based on the default assumptions provided by the Cal/EPA (Cal/EPA, 1994), were assumed.

Cal/EPA has published a cancer potency factor for naphthalene. The cancer potency factor was based on inhalation studies with rats, conducted by the National Toxicology Program (NTP). According to Cal/EPA, the results of these inhalation studies show clear evidence of respiratory epithelial adenomas and olfactory epithelial neuroblastomas in male and female rats. As the studies are focused on the inhalation route of exposure, and as the cancers observed in these studies are associated with the respiratory system, it is possible that the observed carcinogenicity is route-specific, and would not be observed if exposures were to occur via the oral route. Nonetheless, as a conservative screening-level approach, the cancer potency factor for naphthalene developed by Cal/EPA has been applied to the oral and dermal routes of exposure in this HRA. Accordingly, the cancer risk for naphthalene estimated in this HRA is based on the assumption that inhalation, oral and dermal exposure to naphthalene present in soils could result in cancer effects. Further note that there are uncertainties associated with the toxicity value used to estimate the hazard associated with exposure to thallium in soils. The reference dose (RfD) used in the HRA to estimate the hazard associated with exposure to thallium in soils has been withdrawn by USEPA from the Integrated Risk Information System (IRIS) database as of September 30, 2009. Previously, the IRIS database contained separate IRIS summaries for each of the five soluble thallium salts (thallium (I) acetate, thallium (I) carbonate, thallium (I) chloride, thallium (I) nitrate, and thallium (I) sulfate) that were posted in 1988. The previous RfD values for these soluble salts, ranging from 8 × 10-5 to 9 × 10-5 mg/kg-day, were based on the same principal study (MRI, 1988). The available toxicity database for thallium contains studies that are generally of poor quality. The Midwest Research Institute study (MRI, 1988) that was selected as a candidate principal study suffers from certain critical limitations (e.g., high background incidence of alopecia, lack of histopathological examination of skin tissue in low- and mid-dose groups, and inadequate examination of objective measures of neurotoxicity), and there are particular difficulties in the selection of appropriate endpoints. Therefore, even though an RfD would generally be derived with a combined uncertainty factor of 3000, an RfD for soluble thallium salts is not derived in this specific case under the current assessment. Nonetheless, the hazards associated with exposure to thallium in soils have been estimated in the HRA using the withdrawn RfD for thallium salts.

E.4 Uncertainties in the Approaches for the Risk Evaluation of Total Petroleum Hydrocarbon as a Mixture

As indicated in the HRA, the toxicity of total petroleum hydrocarbon (TPH) mixtures is evaluated by evaluating the toxicity of individual compounds that are likely to be associated with the TPH (e.g., benzene, toluene, ethylbenzene, and xylenes [BTEX] and



PAHs), as recommended in California Environmental Protection Agency (Cal/EPA) Department of Toxic Substances Control’s (DTSC) 1994 Preliminary Endangerment Assessment (PEA) Guidance Manual. This approach assesses the health risks associated with the more toxic constituents known to be associated with TPH. Uncertainties inherent in the use of this approach is that not all of the mass of TPH is accounted for by these individual compounds and therefore, the health risks associated with the entire TPH mixture may be underestimated.

Cal/EPA DTSC, TPH Criteria Working Group (TPHCWG), and Massachusetts Department of Environmental Protection (MADEP) have put forth guidance for approaches to evaluate health risks associated with TPH mixtures. In general, these approaches examine a mixture as the sum of several smaller subsets, which are defined by specific carbon ranges and are referred to as fractions. Surrogate toxicity values (i.e. toxicity values derived using toxicity data for mixtures or toxicity values for indicator compounds within a certain fractions) are used to evaluate health risks associated with the individual fractions. Further, the fractional composition of a TPH mixture in terms of both carbon range and structural class (i.e., aliphatic or aromatic) is required for these approaches. There is uncertainty associated with the use of these surrogate approaches in estimating the toxicity of TPH mixtures at the Site because the true composition of weathered TPH-gasoline, TPH-diesel, and TPH-motor oil present at the Site is not known. In addition, the recommended surrogate toxicity values for the TPH fractions are often based on animal studies in which the animals are exposed to fresh petroleum product streams and/or mixtures (i.e. DTSC recommended toxicity value for aliphatic carbon chain C9 to C18 based on various petroleum stream studies on rodents); such studies are arguably not appropriate and/or relevant for evaluating the toxicity of weathered releases, which is the type of TPH present at the Site.

Note that the majority of TPH impacts in the top 10 feet of soils at the Site are collocated with CPAHs and/or other COPCs that exceed their respective ambient-based or risk-based screening concentrations and will be concurrently removed along with CPAHs and other COPCs that exceed their respective ambient-based or risk-based screening concentrations during the implementation of the Feasibility Study/Removal Action Plan (FS/RAW).

E.5 References

California Environmental Protection Agency (Cal/EPA), 1994, reprinted in 1999, Preliminary Endangerment Assessment Guidance Manual, Department of Toxic Substances Control (DTSC), dated January.

California Environmental Protection Agency (Cal/EPA). 2005a. DTSC/HERD Human Health Risk Assessment (HHRA) Note Number 1. Department of Toxic Substances Control (DTSC). October 27.



California Environmental Protection Agency (Cal/EPA). 2005b. Interim Final Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion to Indoor Air. Department of Toxic Substances Control. February.

Kelsey, J.W., B.D. Kottler, and M. Alexander. 1997. Selective Chemical Extractants to Predict Bioavailability of Soil-Aged Organic Chemicals. Environmental Science & Technology, 31(1): 214-217.

Midwest Research Institute (MRI). 1988. Toxicity of thallium (I) sulfate (CAS No. 7446-18-6) in Sprague-Dawley rats. Vol. 2. Subchronic (90-day) study [revised final report]. Prepared by Dynamac Corporation, Rockville, MD, for the Office of Solid Waste, Washington, DC; Project No. 8702-L(18); Work Assignment No. 111148-008.

U.S. Environmental Protection Agency (USEPA). 2010. ProUCL Version 4.00.05 User Guide. Office of Research and Development. Washington, D.C. EPA/600/R-07/038. May.


IRIS ENVIRONMENTAL

ATTACHMENT F

SAMPLE RBSC CALCULATION FOR NAPHTHALENE

ATTACHMENT FEXAMPLE RISK-BASED CONCENTRATION

CANCER ENDPOINT CALCULATION FOR NAPHTHALENE UNDER A FUTURE RESIDENTIAL SCENARIO


For carcinogens, the following equation is used to derive the soil RBSC:

Parameter Definition

RBSCa,carcinogen

Risk-Based Screening Concentration, chemical a, forcarcinogenic effects, (mg/kg)

Target Risk Level Target Cancer Risk Level (unitless)

Riska,inhv

Calculated Cancer Risk for Chemical a for the vaporinhalation pathway, developed as described above(unitless)

Riska,inhp

Calculated Cancer Risk for Chemical a for the particulateinhalation pathway, developed as described above(unitless)

Riska,ing

Calculated Cancer Risk for Chemical a for the soilingestion pathway, developed as described above(unitless)

Riska,der

Calculated Cancer Risk for Chemical a for the dermalcontact pathway, developed as described above (unitless)

Conca,inhv

Representative Exposure Concentration of Chemical a forthe vapor inhalation pathway; mg/kg

Conca,inhp

Representative Exposure Concentration of Chemical a forthe particulate inhalation pathway; mg/kg

Conca,ing

Representative Exposure Concentration of Chemical a forthe soil ingestion pathway; mg/kg

Conca,der

Representative Exposure Concentration of Chemical a forthe dermal contact pathway; mg/kg

Notes:

608

5.5E-05

608

608

608

2.1=

PAH = Polycyclic aromatic hydrocarbons.a Riska,inhv is calculated using the Cancer Risk equation (i.e., cancer risk = EC x URF) presented in Section 7.2.1, where exposure concentration (EC) is calculated using the equation presented in Table 5 for the vapor inhalation pathway for the cancer endpoint; unit risk factor (URF) for naphthalene is presented in Table 10. The concentration of chemical in air (Ca) in the EC equation is calculated by dividing the concentration in soils (i.e., 608 mg/kg for naphthalene) by the volatilation factor (VF) for the chemical (i.e., 7.0 x 104 m3/kg). VFs for volatile chemicals are presented in Table D-8 of Attachment D.

Parameter Values for PAHNaphthalene

See calculated value above

1.0E-06

1.2E-04

7.1E-09

1.1E-04

a

⎟⎟⎠

⎞⎜⎜⎝

⎛⎥⎦⎤

⎢⎣⎡

⎥⎦⎤

⎢⎣⎡

⎥⎦⎤

⎢⎣⎡

⎥⎦⎤

⎢⎣⎡

=+++

dera

dera

inga

inga

inhpa

inhpa

inhva

inhvaa

ConcRisk

ConcRisk

ConcRisk

ConcRisk

letRiskLeveTcarcinogenRBSC

,

,

,

,

,

,

,

,

arg,

Attachment F Example RBSC Calculation Page 1 of 1 IRIS ENVIRONMENTAL


APPENDIX E Extent of Soil Chemical Impacts Above Cleanup Goals



July 11, 2012

599

SS‐1 BaPe Naph Pb

0' 0.43946 <1.65 23.9

SS‐2 BaPe Naph Pb

0' 7.4624 0.540 24,800

SS‐3 BaPe Naph Pb Thal l ium

0' 170.07 5.0 451 7.8

SS‐4 BaPe Naph Pb

0' 23.38 5.1 691

SS‐5 BaPe Naph Pb

0' 1.09904 <1.65 147

SS‐6 BaPe Naph Pb

0' (0.28875) <0.330 3.2

SS‐7 BaPe Naph Pb Antimony

0' 87.11 15 1,400 49.6

SS‐8 BaPe Naph Pb

0' 43.346 3.3 2,320

SS‐9 BaPe Naph Pb

0' 9.7702 0.960 165

SS‐10 Pb

0' 599

SB‐1 BaPe Naph Pb

0' 0.43838 0.041 39.33' 0.02025 <0.015 5.556' 0.00925 <0.015 1.939' (0.00875) <0.015 3.56

SB‐2 BaPe Naph Pb

0' 0.03986 <0.015 2.763' (0.00875) 0.016 2.226' (0.00875) <0.015 1.829' 0.09633 <0.015 1.79

SB‐3 BaPe Naph Pb

0' 0.5109 0.570 1.963' 0.3121 0.230 53.16' 0.5062 0.350 22.19' (0.00875) <0.015 13.4

SB‐4 BaPe Naph Pb

0' 0.9624 0.140 14.93' 0.6333 0.540 64.96' 0.216 <0.150 24.87' 3.818 0.950 783

9' (0.00875) <0.015 1.8

SB‐5 BaPe Naph Pb

0' 29.16 1.40 1,1006' 0.00925 0.020 2.249' (0.00875) 0.042 2.72

SB‐6 BaPe Naph Pb Benzene Ethylbenzene

7.5' 7.217 12.0 12.2 0.140 <0.0059.5 53.8 790 26.6 2,700 5012.5 117.57 1,500 93.2 3,700 40

SB‐7 BaPe Naph Pb

0' 95.72 180 988

3' 0.5872 0.420 31.96' 33.238 27.0 227

9' (0.00875) 0.048 4.14

SB‐8 BaPe Naph Pb

0' (0.04375) <0.075 3.303' (0.00875) <0.015 3.995.5' 53.255 67 97.36' 0.03745 <0.015 2.549' (0.00875) <0.015 5.60

SB‐9 BaPe Naph Pb

0' 4.812 0.52 153

3' 0.13855 0.027 13.16' 1.1576 0.2 6.939' 0.2145 0.21 3.79

SB‐10 BaPe Naph Pb Cobal t

1.5' 3.264 2.7 56.6 1393' 0.53266 0.031 9.40 16.76' 0.4164 0.018 2.79 7.299' (0.00875) 0.22 3.42 8.56

SB‐11 BaPe Naph Pb

0' 1.4728 0.24 1013' 0.02864 0.028 4.706' 0.01212 0.034 3.629' (0.00875) <0.015 2.4215' (0.00875) <0.015 1.47


0' 1.3253 0.4 99.21.5' (0.00875) <0.015 2.483' 35.86 6.8 383

6' 8.4462 2.6 549' 0.7633 0.71 7.6712' (0.00875) <0.015 3.5415' 0.01215 <0.015 4.43


0' 93.766 19 386

3' 28.406 3.4 1166' (0.00875) <0.015 46.69' (0.00875) <0.015 3.36


0' 2.1936 0.68 1452' 84.71 510 1433' 71.06 460 37.96' 19.628 170 10.19' (0.00875) <0.015 2.58


0' 14.619 4.1 261

3' 10.078 3 55.36' 2.498 <0.750 27.39' (0.0175) <0.030 1.09


1' 16.2166 1.6 371

3' 0.09889 0.15 32.06' 0.21505 <0.30 4.879' (0.0175) <0.015 3.14


1' 4.1594 0.79 86318' 0.1762 <0.20 10.120.5' 0.3587 4.8 2.0025.5' (0.0175) 0.020 1.45


0' 56.814 11 268

8' 0.2101 <0.10 3.4216' 0.993 0.47 4.2526' (0.0175) <0.020 5.6265' (0.0175) <0.020 3.63

SB‐19 BaPe Naph Pb Ethylbenzene

5' 0.0175 <0.020 1.99 <0.0009215.5' 0.3555 1.8 3.14 0.92021' 0.3547 4.8 2.23 7.528' (0.0175) <0.020 3.79 <0.0011


0' 5.2528 0.62 90.614' (0.0175) <0.020 4.1220' 0.0394 0.087 2.2566.5' (0.0175) <0.020 5.23


0' 0.4091 0.054 77.85' 1.4182 0.290 1.9310' (0.0175) <0.020 2.86


0' 18.79 16 323

5' 2.607 0.46 2.2710' (0.0175) <0.020 4.50


0' 25.846 3.4 1,340

10' (0.0175) <0.020 2.5112' 23.88 3.3 1,100

15' (0.0175) <0.020 3.02


0' 0.5336 0.10 12.35' 0.6613 <0.10 3.2010' (0.0175) <0.020 3.93


0' 62.4 24 180

5' (0.0175) <0.020 2.9010' (0.0175) <0.020 1.64


0.5' (0.0175) <0.020 6.035' (0.0175) <0.020 1.8110' (0.0175) <0.020 1.83


0.5' 1.8614 <0.020 52.15' (0.0175) <0.020 3.4110' (0.0175) <0.020 1.2515' (0.0175) <0.020 1.83


0.5' 0.61776 0.051 52.18' (0.0175) <0.020 3.9715' (0.0175) <0.020 3.28


0.5' 0.2243 <0.020 29.55' (0.0175) <0.020 1.9310' (0.0175) <0.020 2.6113' (0.0175) <0.020 3.39


0.5' 0.63068 0.086 57.25' 0.0187 <0.020 2.6710' (0.0175) <0.020 3.4813' (0.0175) <0.020 3.84


0.5' 0.08693 0.026 7.185' (0.0175) <0.020 1.6810' (0.0175) <0.020 3.7315' (0.0175) <0.020 0.602


0.5' 0.3656 <0.020 5.315' 0.0779 <0.020 4.6010' (0.0175) <0.020 5.2715' (0.0175) <0.020 0.889


0.5' 153.14 49 80.75' (0.0175) <0.020 2.3910' (0.0175) <0.020 6.7015' (0.0175) <0.020 1.23


0' 18.978 3.6 2078' (0.0875) <0.10 2.4112' (0.0175) <0.020 1.42


0' 10.487 2.1 1293' 0.09929 <0.020 3.396' (0.0175) <0.020 2.509' (0.0175) <0.020 3.31


0' 0.4333 1.3 45.33' 0.7414 0.10 9.316' (0.0175) <0.020 3.249' (0.0175) <0.020 3.46


0' (0.175) 5.8 7.663' 3.276 0.66 12.66' 0.0193 0.040 4.049' (0.0175) <0.020 2.77


0' 1.83 5.0 53.23' 0.2738 0.16 6.666' (0.0175) <0.020 3.829' (0.0175) <0.020 2.65


0' (0.175) 2.2 25.93' (0.0175) 0.36 3.346' (0.0175) <0.020 2.749' (0.0175) <0.020 1.87


0' 0.07357 <0.020 70.93' 0.12601 0.039 2506' (0.0175) <0.020 3.449' (0.0175) <0.020 2.16


0' 0.1271 1.4 17.73' (0.0175) 0.037 3.726' (0.0175) <0.020 3.629' (0.0175) <0.020 1.91


0' 0.10358 0.12 16.33' (0.0175) <0.020 3.436' (0.0175) <0.020 3.949' (0.0175) <0.020 2.42


0' 5.348 0.86 99.83' 0.04853 <0.020 3.776' (0.0175) <0.020 2.069' (0.0175) <0.020 2.71

SB‐44 BaPe Naph Pb Nickel

0' 0.04512 1.3 36.0 4,3303' 0.22423 0.078 15.3 1156' (0.0175) <0.020 7.01 14.69' (0.0175) <0.020 1.88 4.17


0' 0.11995 6.9 13.83' 0.08986 0.24 5.946' (0.0175) <0.020 1.689' (0.0175) <0.020 2.08


0' 0.4257 1.1 52.33' (0.0175) 0.055 3.926' (0.0175) <0.020 3.059' (0.0175) <0.020 1.47


0.5' 25.486 1.2 2223' 0.18134 <0.020 5.936' (0.0175) <0.020 2.42


1.5' 91.048 9.6 24.63' 7.6314 1.2 7.876' (0.0175) <0.020 3.38

SB‐49 BaPe Naph Pb Benzene Pyrene Fluoranthene

Benzo(g,h,i )Perylene

Acenaph‐thylene

2‐Methyl ‐naphtha lene

3' 17.712 4.9 10.8 0.0010 13 10 22 2.7 <1.04' 4,998 23,000 86.2 0.810 10,000 9,800 3,400 4,100 1,0006' 0.26264 0.17 9.11 <0.00061 0.54 0.49 0.16 0.13 <0.020


1.5' 43.67 <4.0 15.33' 0.10026 <0.020 3.126' (0.0175) <0.020 3.41

SB‐51 BaPe Naph Pb Pyrene Fluoranthene Perylene

1.5' 2.3704 0.34 11.4 2.7 2.7 2.63' 0.58588 0.27 6.70 0.82 0.60 0.596.5' 9,824 <1,000 15.1 21,000 20,000 11,0009' (0.0175) <0.020 3.59 <0.020 <0.020 <0.020


1' 0.18227 <0.020 6.783' 0.0711 <0.020 4.046' (0.0175) <0.020 2.639' (0.0175) 0.040 4.4115' (0.0175) <0.020 1.9420' 0.3529 <0.40 3.3924.5' (0.0175) 0.062 5.89


0.5' 0.10622 <0.040 39.13' (0.0175) <0.020 5.926' 0.3375 <0.040 14.49' (0.0175) <0.020 4.0415' (0.0175) <0.020 2.1120.5' 0.0358 <0.040 2.2725' (0.0175) 0.12 4.35


1' 0.0188 <0.020 9.213' 0.07899 <0.020 7.956' (0.0175) <0.020 2.829' (0.0175) <0.020 4.7515' 0.0758 <0.040 6.2620' 0.037 <0.040 4.8922' 0.0845 0.21 3.51


1.5' (0.0175) <0.020 3.753' (0.0175) <0.020 4.046' (0.0175) <0.020 3.479' (0.0175) <0.020 2.7515' (0.0175) <0.020 4.0720' 0.0373 <0.040 2.3425' (0.0175) <0.020 6.20


0.5' 36.34 <4.0 3463' 0.27258 0.058 6.966' 0.05551 <0.020 4.169' 0.0198 <0.020 3.5015' 0.03653 <0.020 5.3120.5' 0.882 <1.0 3.5825' (0.0175) <0.020 5.17


20.5' (0.0175) <0.020 2.32SB‐58 BaPe Naph

0' 0.07252 <0.0205' (0.0175) <0.02010' (0.0175) <0.020

SB‐59 BaPe Naph

3' (0.0175) <0.0205' (0.0175) <0.02010' 0.08259 <0.020

SB‐60 BaPe Naph

0' (0.0175) <0.0205' 0.01772 <0.02010' (0.0175) <0.020

SB‐61 BaPe Naph

0' (0.0175) <0.0205' 0.01762 <0.02010' 0.01765 <0.020

SB‐62 BaPe Naph

0' (0.0175) <0.0205' (0.0175) <0.02010' 0.01881 <0.02015' (0.0175) <0.020

SB‐63 BaPe Naph

1' (0.0175) 0.205' (0.0175) <0.02010' (0.0175) <0.02015' 0.02053 <0.020

SB‐64 BaPe Naph

1' (0.0175) <0.0205' (0.0175) <0.02010' (0.0175) <0.02015' (0.0175) <0.020

SB‐65 BaPe Naph

1' 0.03804 <0.0205' 0.03645 0.06210' 0.22148 <0.02015' (0.0175) <0.020

SB‐66 BaPe Naph

0' (0.0175) 0.195' (0.0175) <0.02010' 0.05114 <0.020

SB‐67 BaPe Naph

0' (0.0175) <0.0205' (0.0175) <0.02010' (0.0175) <0.020

SB‐68 BaPe Naph

0' (0.0175) <0.0205' (0.0175) <0.02010' (0.0175) <0.020

SB‐69 BaPe Naph

0' (0.0175) <0.0205' (0.0175) 0.03910' 0.04913 0.035

TP‐1 BaPe Naph Pb0.5' 0.16558 <0.020 1083' (0.0175) <0.020 9.756' (0.0175) <0.020 4.29

TP‐2 BaPe Naph Pb

0.5' 1.3059 <0.20 2003' 0.16315 <0.020 39.36' 6.777 <1.0 28.19' 0.0194 <0.020 8.11

TP‐3 BaPe Naph Pb0.5' 27.616 <2.0 3473' 0.8562 <0.10 75.16' 0.8916 <0.10 19.9

TP‐4 BaPe Naph Pb0.5' 0.0388 <0.020 8.683' (0.0175) <0.020 4.696' (0.0175) <0.020 2.83

TP‐5 BaPe Naph Pb0.5' 0.05599 0.045 92.73' (0.0175) <0.020 8.926' (0.0175) <0.020 3.10

TP‐6 BaPe Naph Pb0.5' 2.778 <0.40 7013' (0.0175) <0.020 57.66' (0.0175) <0.020 8.05

TP‐7‐25 BaPe Naph Pb1.1' 2.76 <0.40 2592.7' 1.5662 0.28 22.4

TP‐7‐40 BaPe Naph Pb1.1' 0.33902 0.038 11.92.7' 0.0214 <0.020 4.08

TP‐8 BaPe Naph Pb0.5' 45.532 3.8 2503' 0.5217 0.031 7.366' 0.13354 <0.020 4.04

TP‐9 BaPe Naph Pb0.5' 54.226 <2.0 1683' 3.205 <0.40 24.96' 0.6713 <0.10 5.499' 0.79 0.34 2.91

TP‐10 BaPe Naph Pb0.5' 0.2233 0.029 30.73' 1.6857 <0.20 15.96' 0.15649 <0.020 4.92

TP‐11 BaPe Naph Pb0.5' 89.456 5.8 32.03' 31.31 1.2 9.436' 1.9426 <0.20 4.479' 4.8578 1.5 3.20

AK‐1 BaPe Naph Pb2.5' 0.29454 <0.020 39.63.2' 0.10127 <0.020 24.4AK‐2 BaPe Naph Pb

1.7' 0.0385 <0.020 31.72.8' (0.0175) <0.020 6.69

AK‐3 BaPe Naph Pb1.4' (0.0175) <0.020 2.77


APPENDIX F DTSC Responsiveness Summary and CEQA Notice of

Exemption Human Health Risk Assessment / Feasibility Study / Removal Action


PN: 185702232 July 11, 2012

Department of Toxic Substances Control

Matthew Rodriguez Secretary for

Environmental Protection

Deborah O. Raphael, Director 1515 Tollhouse Road

Clovis, California 93611

Edmund G. Brown Jr.

Governor

Printed on Recycled Paper

Responsiveness Summary

Draft Final Removal Action Workplan, July 2011 Notice of Exemption – CEQA

Former Lodi Manufactured Gas Plant Site

June 22, 2012

Project Title: Draft Human Health Risk Assessment/Feasibility Study/Removal Action Workplan for Former Lodi Manufactured Gas Plant Site Project Location: 712 South Sacramento Street, Lodi, California Contact Person: Jeff Gymer (559) 297‐3907

I. Introduction From May 20 through June 21, 2012, the California Department of Toxic Substances control (DTSC) held a public comment period on the Draft Final Human Health Risk Assessment/Feasibility Study/Removal Action Workplan (Draft RAW) and CEQA – Notice of Exemption for the former Lodi Manufactured Gas Plant (MGP) site located at 712 South Sacramento Street, San Joaquin County, California. The purpose of the comment period was to provide the public with an opportunity to review information regarding the project and to solicit public comments on the adequacy of the Draft RAW and appropriateness of the Notice of Exemption. DTSC received one written comment on the project during the public comment period. Project records are available for review at:

DTSC – File Room 1515 Tollhouse Road Clovis CA 93611 (559) 297‐3901 Please call for an appointment

The RAW and associated documents are also available for review at: Fresno County Free Library ‐ Reference Desk 2420 Mariposa Street Fresno, CA 93721 (559) 600‐7323 Or electronically at: http://www.envirostor.dtsc.ca.gov/public. II. Comment and Response

Comment: “Considering the economics of the City of Lodi, the State of California, the United States of America, and all European nations, the soonest this ground would be needed for any purpose that would at al disturb it would be a minimum of fifty years. Leave it alone!.” Received May 30, 2012 from Mr. James N. Sayles, 411 S. School Street, Apt. 1, Lodi, CA 95240. DTSC Response: Pacific Gas and Electric Company (PG&E) is voluntarily cleaning up this project and bearing the sole cost of project investigation and cleanup. The remediation of this site is part of a company‐wide program to address soil and groundwater impacts at all manufactured gas plant properties that the company historically owned and/or operated. DTSC’s mission is to provide the highest level of safety and to protect public health and the environment from toxic harm. Cleanup of this site is in keeping with DTSC’s mission.

July 2012 (PDF, 9.9 MB)

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