Review of

Current Conditions Report and Work Plan for Area 1

Presented by

The Great Plains/Rocky Mountain Technical Outreach Services for Communities

Report Organization

1. Introduction 2. Current Conditions 3. Facility Dismantling Procedures 4. Assessment Locations 5. Soil Boring and Monitoring Well Installation Procedures 6. Soil and Stream Sediment Field Screening and Sample Collection and

Handling Procedures 7. Groundwater Monitoring Well Development and Sampling Procedures and

Surface Water Sampling Procedures 8. Determination of Remediation Objectives 9. Soil Remediation Procedures 10. Documentation and Reporting 11. Selected References

Introduction

Area 1 is about 14 acres, 2 miles long, 60 feet wide

goal of process is to obtain a No Further Remediation (NFR) letter from IEPA

Area 1 is to be a bicycle trail– plan to remediate soil as necessary– and/or install an engineered barrier– groundwater remediation if necessary

would occur while Area 1 is in use

Current Conditions

Area 1 includes– underground concrete and piping from several

buildings that need to be removed– a septic tank and piping from office building to

ditch on Eastern plant boundary no recorded spills within Area 1 boundaries groundwater less than 10 feet below

surface, flow is 0.05 to 0.57 feet per year

Current Conditions

no SWMUs in Area 1 storm water drainage is to the North and

South Stormwater Ponds Area 1 crosses 5 wetland areas

Preliminary soil assessment (Feb 2000)

62 samples from 23 borings Appendix B tables— organic chemicals

– Tier I remediation objectives exceeded» benzene at 2 to 4 feet in two locations (BC-4 and

BC-10)

» benzo(a)pyrene at 0 to 2 feet in two locations (BC-12 and BC-22)

» benzo(a)fluoranthene and benzo(a)anthracene also at BC-12

Preliminary soil assessment (Feb 2000)

Appendix B tables— organic chemicals– benzo(a)pyrene at 0 to 2 feet in two locations

(BC-12 and BC-22)» the detection limit for this chemical is greater than the

calculated soil remediation objective by about 4 times.

– There appear to be no Tier I remediation objectives for 1-methylnaphthalene, 2-methylnaphthalene and phenanthrene

» will Tier II calculations be required by IEPA?

Preliminary soil assessment (Feb 2000)

Appendix B tables— inorganic chemicals– beryllium in 48 of 62 samples– arsenic in 61 of 62 samples

» It appears that this is a natural occurrence of these metals. The average amounts are similar to reported values for Will county.

Environmental Audit (July 1990) Appendix H

2 sampling locations overlap Area 1 (F3 and F4)

toluene, trichloroethylene, and “oil and grease” were detected

Facility Dismantling Procedures

fluids will be removed from pipes with vacuum trucks and burned for energy recovery

water in pipes or structures will be tested and released, treated or shipped offsite, as appropriate

a cross section of Area 1 will be trenched to search for unknown structures

geophysical surveying will be used to identify unknown structures

Future Assessment Plans

at least one soil sample from under each structure in Area , except lunch room and gate house

at least one soil sample for every 250 feet along length of Area 1

up to 3 monitoring wells will be installed in Area 1 upstream and downstream surface water and

sediment will be sampled for each stream crossing Area 1

Remediation Objectives

If Tier I remediation objectives are exceeded,– soil or groundwater will be cleaned up– an engineered barrier will be used, or– a Tier 2 evaluation will be done.

Remediation procedures

Petroleum impacted soil will be removed immediately when found– stops ongoing migration of contaminants

to surrounding soil and groundwater

– sidewalls and bottom of excavation will be sampled and tested for remaining contamination

Documentation and Reporting

maps showing location of former piping and structures

summary of assessment and cleanup procedures figures and tables showing sample locations, where

soil was removed, screening and laboratory results laboratory reports description of procedures followed summary of management and final

disposal of contaminated soil