SDMS DocID 7834

FLETCHER'S PAINT WORKS & STORAGE SUPERFUND SITE

REMEDIAL INVESTIGATION MEETING

Hampshire Hills Sports & Fitness Center August 17,1994

6:00 p.m.

Sup^rfund Process

The Superfund Process

Removal Action (as needed)

Site NPL Ranking/ Remedial Feasibility Negotiations Discovery Listing Investigation Study

Public Remedial Long-Term Clean-up Plan Negotiations Comments Design Cleanup

OH-29

Site History

Historical uses in the Site Area:

farm

carriage painting

town burning dump

car dealership

armory

Fletcher's Paint Works

tannery

grain elevator/grist mill

Site Description •-N

Elm Street Site Area:

Fletcher's Elm Street Property (formerly Fletcher's Paint Works)

Mill Street Site Area:

Fletcher's Mill Street Property

Drainage Ditch

Keyes Field

EPA Activities At the Fletcher'sJPaint Site

1984 Contamination Of Keyes Municipal Well

1984 EPA performed a Preliminary Assessment and several Site Investigations of the Site

1988 EPA performed drum removal action at Fletcher's Paint \

Works

1989 Fletcher!s Paint Site was listed on the National Priorities List

1991 EPA performs removal action to fence Elm Street Site

1991- EPA performs Remedial Investigations into the

1994 nature and contamination at the site

1993 EPA performs removal action to take down storage shed

EPA Removal Actions

1988 removed 863 drums of hazardous materials and 12 bags of asbestos

EPA covered the Elm Street property and the Mill Street Property with a cap

1991 fenced a portion of the Elm Street property, and removed several small containers from inside the building

1993 removed 512 drums and 99 boxes of hazardous materials stored in Mill Street Shed and Elm Street Building

repaired the fence and added gravel to stabilize the cap on Elm Street

demolished and disposed of the former Mill Street Storage Shed; capped and this area

Summary of Major Findings

• High levels of contamination found in soils at Elm Street and Mill Street properties

• High levels of contamination found in groundwater moving from the Mill Street Site north to Elm Street Site and Souhegan River

• Low levels of contamination found in soils under the lawns and in dirt driveways of residential houses directly across from Mill Street Site.

• Low levels of contamination found in the soils along the upper portion of the Keyes Drive, adjacent to Elm Street Site

• Low levels of contamination found in sediments and soils in and along the drainage ditch, and in a former residential garden located adjacent to the ditch

• Low levels of contamination found in sediment and surface waters in Souhegan River near the Elm Street property; the riverbank soils directly beneath the Elm Street site had moderately higher contamination levels

What's Next Fletcher's Paint Works & Storage Superfund Site-

Elm & Mill St. locations

Informal Meeting - Fall - cleanup options/impacts

Proposed Cleanup Plan - Winter f

Public Comment Period on Proposed Cleanup Plan

Final Cleanup Plan

Field Investigation

Field Investigation Objectives

The objectives of the Remedial Investigation/Feasibility Study (RI/FS) field investigation are to determine the:

Nature and Extent of Contamination

Transport and Fate Mechanisms •

and to provide information in support of: .>'

Risk Assessment

Feasibility Study

Phase 1A Field Investigation

As part of the RI/FS several different surveys were conducted in and around the site between October 1991 and February 1992.

Field Reconnaissance Survey

Location and Elevation- Survey

Ground Penetrating Radar Survey 4 ­

s

• Seismic Refraction and Very Low Frequency Survey

• Subsurface Soil Exploration

Ground Water Monitoring

Phase 1A Field Investigation (continued)

Surface Water and Sediment Sampling

Surface Soil Sampling .

Catch Basin and Outfall Sampling

Building Surface Sampling

Hydraulic Survey

Biota and Ecosystems Survey

Demographics Survey

cr: ESS EM ESS sss E:r3 KM 8E3 L~J EE3 BE;-: EIE era ESS u SID ..~~i ,—i

Phase 1B Field Investigation

To address data gaps remaining from the Phase IA field investigation, we conducted some additional surveys in and around the site between October 1993 and January 1994.

Location and Elevation Survey Seismic Refraction Survey Subsurface Soil Exploration Ground Water Monitoring </ Hydraulic Survey

• Small Diameter Well Survey • Surface Water and Sediment Sampling • Surface Soil Sampling

Geology - Key Results

Bedrock

Massabesic Gneiss and Milford Granite at depths ranging from 20 to 70 feet below grade in the study area. Some relatively high angle (vertical) fractures. Bedrock high at Mill Street.

•

Overlying Unconsolidated Sediments J

Surface fill at Mill Street (boulders) and Elm Street (old municipal burn dump and resinous materials). Glacial Outwash Deposits (sands, gravel). Glacial Till (Sand).

MILL S" "'EET

F'

270 270

B&M RR EB-19 MILL ST.

260 EB-13 260 BACKFILL MW-08

FINE TO MEDIUM SAND AND GRAVEL

•\' •••-•• . - • • • • T -.' ••' ­ • ' rr-: .... ...-*-—i v • • . • • • • • • A . - • • • • • - . •:':7r7r:^ -^ . - - • •:^_u^j'^ *•'•:' ­ ­

I.": .' ••-... .V. . ; ­ • . • • ^>>^ • •' •:•'•'.' • • «^>^

Cn

] B A

250 250

MEDIUM TO COARSE SAND AND GRAVEL

240 240

\/ \ \7/ ^ I I \ / \ 'x /

230 230

VIEW LOOKING WEST 220 220

HORIZONTAL SCALE

0 25 FT.

210 210

ELM STREET

A'

SOUHEGAN RIVER

VIEW LOOKING NORTHWEST

Ground Water

The Milford-Souhegan Aquifer extends approximately three miles from East Wilton, NH to the Milford Town Center. The Keyes Municipal Supply Well and the Fletcher's Paint Site are located near the eastern end.

Ground water flow is generally toward the Souhegan River and flows in a north-northwest direction across the Elm Street Site and the Keyes Field. Ground water discharges into the Souhegan River.

Rl MONrrORMQ WELLS

LEGEND

WBLLS WTTH DETECTED OONTAMNATON N EXCESS OF DRNKMa WATER OTANDAnDS (MCU)

/4

WBLS WITH DETECTED CONTAMNATION BBjOW DRNONQ WATER 8TAN)An>3 (MCU)

DEEP WELL

SHALLOW WELL

C BEDROCK WELL

toot terra Cisj- CETJ ?rra

Around water samples from "n and around the Fletcher's Paint Site include:

• -Halogenated Organic Contaminants (HOCs)

- Trichlorethylene (TCE)

Benzene, Toluene, Ethylbenzene, Xylenes (BTEX)

Polychlorinated Biphenyls (RGBs)

• Trichlorobenzene (TCB) /»

Metals (lead)

LI IV-/ I I

Souhegan River Results

Chemicals of concern were found at elevated concentrations, particularly in sediments adjacent to the Elm Street site and then decreased downstream. Chemicals include:

• RGBs •

Metals (lead and chromium)

,>' Xylenes

• PAHs

Risk Assessment

Sup fund Process

The Superfund Process

Removal Action (as needed)

;t'"l^*Vv^ "*v lU U MujH_|Bani Auj i,

Site Discovery

NPL Ranking/ Listing Negotiations Remedial

Investigation Feasibility

Study

Public Comments

Clean-up Plan Negotiations Remedial Design

Long-Term Cleanup

OH-29

OVERVIEW OF SUPERFUND HUMAN HEALTH RISK ASSESSMENT ••-N

FOR THE ' ' N.

FLETCHER'S PAINT .SUPERFUND SITE

AUGUST 17, 1994

Ann-Marie Burke Toxicologist USEPA/ Region 1

RISK DEFINED What is risk? - probability of loss or injury

What is human health risk at Superfund sites? - Probability that people living, working, or playing at or near a Superfund site may experience health problems as a result of their exposure to chemicals at the site."

[BASELINE HUMAN HEALTHRISK ASSESSMENT

DEFINITION

The assessment of potential adverse human health effects (current and future) resulting from exposure to hazardous substances at a site in the absence of any cleanup.

PURPOSE

Identify-risks and their primary causes at site.

Support the need for clean-up.

BASELINE HUMAN HEALTH RISK ASSESSMENT IS NOT:

Study of current health of exposed population.

Prediction of health outcomes from past site exposures.

V ;i i fcj

COMPONENTS OF THE ASSESSMENT PROCESS

Data Collection and

Evaluation

Exposure Toxicity Assessment Assessment

Risk Characterization

3-5

HAZARD IDENTIFICATION '~ t] BASIS FOR SELECTION Q£ CONTAMINANTS

OF CONCERN (COC) 1

Occurrence and distribution

Fate, mobility, persistence in environment p

Concentration, toxicity f

1

E

CHEMICALS Ul'1 CGMCIiKN FOR FLKLCllLR'S PAir-Ti' SITE

Chemical ;•; .• ^?:?8i jj$ :f$ *-'± Surface • ' : ; • . .-?. ':',:. Subsurface * ..:.,}/•: ' '- Surface Walef S;?: Ground Water* :

: ' : i : V . : : ; ' Soil : :: Soil : •"! :'SouhcganRlveii'(i) W Souhe^ariRlver:W Drainage DltcHs! Drainage Dlich Vola Ulo Organic Compounds \ 1,2-Dlchloroethane * ^-^X' ' ' 3enzone Elhylboiuene

•;? .;.r.KM*.*>?...*.^*lx..#..?s^.

Felrnchlofoethene Toluene

;SlliSll ilil |l f4&M fr$m:%&'

Frlchloroethene Kylenas (total) Sonilvolnlllo Organic Compounds 1,2,4-Trichlorobenzene \cenaphthylona 3enzo (a) anthracene 3enzo (a) pyrene 3enzo (b) Huoranthene 3enzo (k) fluoranlhene 3enzo(g,h,l)pefylene Ghrysone Dlbaiuo (a,h) anthracene indono (1,2,3-c,d)pyrene Naphthalene 3honanthrene PestlcldeSPCBa

ilpha-Chlordane Voclor-1221 iVroclor-1242 ^oclor-1248 i\roclor-1254 Dleldrin Hopiachlor Epoxlde Inorganics

Arsenic Catlmlum Chromium Lead Manganese Mercury Nickej Vanadium

EXPOSURE ASSESSMENT PURPOSE n

'• -N.

To evaluate the potential for human exposure to hazardous chemicals identified in site media (i.e. sediment, surface water, fish, groundwater).

METHODS

Consider;

Source - from which chemicals released to .- i

-

environment • fs

&

Route ­ contaminants transported thenvironmental medium

..rough

P ~ y

Exposure - human or ecological receptor «

Source + Route + Exposure = Completed Exposure Pathway

EXPOSURE PATHWAYS FOR HUMANS

Prevailing Wind Direction

Transport Medium (Air)

R«l«a*« Mcchanicrn (Volatilization)

Inhalation Exposure Route

V

R«1««M Machantetn

Transport Mcdhmr (Ground Water) •

FLETCHER'S PAINT SITE EXPOSURE PATHWAYS IDENTIFIED

'•'£ EXPOSURE/OWE; ',£XpO^p& ^^^ 1 EXPOS' URE?^ $$». ,p^?J&£$*&

;

Groundwater Ingestion Future - , Adult 1 '•-N.

Surface Water Souhegan River Ingestion Present= Future Swimmer: Young Child

0fci

SwimmerAdult Dermal SwimmerYoung child B

SwimmerAdult Drainage Ditch Dermal WaderYoung child n

WaderAdult ti Sediment n Souhegan River Ingestion Present= Future Swimmer: Young child

SwimmerAdult Dermal " Swimmer- Young Child R

SwimmerAdult H Drainage Ditch Ingestion Wader: Young Child

WaderAdult Dermal Wader: Young Child

WaderAdult ^

Surface Soils • •A Mill & Elm Street Area Ingestion Present= Future Young child

Adult MbDermal Present= Future Young child Adult ess,

Drainage Ditch Ingestion Present= Future Young Child Bs . Adult Dermal Young Child

Adult { -p?{ Ingestion of Crops Adult

Subsurface Soils Mill & Elm Street Area Ingestion Future Young Child

Adult P Dermal Young Child iJ

Adult

Fish Present= Future I Souhegan River - Ingestion Adults (semi-quant.)

a

ASSESS EXPOSURE

Five Basic Variables Used to Estimate Intake

Exposure Point Concentrations: 9

Contact Rate: o Calendar o

« u T w T F »

Exposure Frequency/Duration: 9

Body Weight: 9

Exposure Averaging Time: 9

r

QUANTIFY EXPOSURE PUTTING IT ALL TOGETHER

Land Use

Potential Pathway-Specific Exposure Exposure Intakes Pathways For Each Chemical

Models

Reasonable Maximum Exposure (RME)

4-7

ASSESS EXPOSURE

Reasonable Maximum Exposure (RME)

Definition: Highest exposure" that is reasonably expected to occur at a s|ite, considering

• land use • intake variables • pathway combinations

ntent is to estimate a conservative exposure case that is still within the range of possible exposures.

J -<

TOXICITY ASSESSMENT r r

• Identifies adverse bealth effects - cancer, systemic, other.

• Characterizes quality and i strength of evidence for adverse i health effects i to develop a dose-response § relationship/value.,

• Based on available human studies and/or animal studies.

Q 0

TOXICITY ASSESSMENT '•*v

\

CARCINOGENS

• any agent that produces neoplasms (cancer)

• includes: organic and inorganic chemicals, viruses, ionizing radiation

• diff. properties, diff. mechanisms of action

• no threshold (no dose is risk free)

NONCARCINOQENS

adverse health effect other than cancer

protective mechanisms must be overcome before adverse effect occurs

threshold above which adverse effect occurs

RISK CHARACTERIZATION r> •"••••••. ^^^^mmmmmml ^mmmm^«^_mmmmm^_••m~mm—I

RISK = EXPOSURE X TOXlplTY ^ » »

CARCINOGENS |

Risk expressed as a probability S

Extrapolate - high dose to low dose ® animal to human |

Superfund - cancer risk less than 10-4 | generally 'does not warrant action.

>. .1 NONCARCINOGENS 1

f Exposure level compared to'Yeference " dose" (no effect below the reference dose)

Exposure dose = hazard quotient RfD

Summation of hazard quotients - hazard index (HI)

His greater than 1 are a sign to the RPM to look closely at possibe need for remedial action.

FLETCHER'S PAINT SUPERFUND SITE EXPOSURE PATHWAYS WHICH EXCEED EPA'S TARGET RISK RANGE

MEDIUM AREA EXPOSURE ROUTES

(Cancer Risks)

Surface Soils Mill & Elm Street Ingestion, dermal contact Drainage Ditch Ingestion, dermal contact, crop ingestion

Subsurface Soils Mill & Elm Street Ingestion, dermal contact

Groundwater Site Ingestion

(Noncancer Risks)

^urface Soils Drainage Ditch Ingestion, dermal contact, crop ingestion

Groundwater Site Ingestion

?Fish Souhegan River Ingestion

UNCERTAINTIES IN RISK ASSESSMENT

dose from site related exposures'

dose required to produce a particular health effect

metabolism of chemical in body to more or less toxic compound

correlation of toxic effects in animals with toxic effects in humans

.>' correlation of toxic effects from one route of exposure'to another

target organ and resulting impact on health