PUBLIC HEALTH ASSESSMENT

EVERGREEN MANOR GROUNDWATER CONTAMINATION SITE
WINNEBAGO COUNTY
ROSCOE, ILLINOIS

TABLES

Table 1.

Evergreen Manor Residential Drinking Water Sample Results

Chemical	Maximum Detected Level (ppb)	Comparison		Residential Wells Greater Than Comparison Value*
		Value (ppb)	Source
Trichloroethene (TCE)	91	5	MCL	128
Tetrachloroethene (PCE)	5.8	5 (100)	MCL (RMEG)	5
1,1-Dichloroethene (DCE)	7.2	7 (0.06)	MCL (CREG)	1

MCL - Maximum Contaminant Level * - Number of residences with sample results greater than or equal to the comparison value. CREG - Cancer Risk Evaluation Guide

ppb - parts per billion RMEG - Minimum Risk Level (for children)

Table 2.

Evergreen Manor Monitoring Well Sample Results

Chemical	Concentration Range (ppb)	Comparison
		Value (ppb)	Source
Trichloroethene (TCE)	0.2 - 15.0	5	MCL
Tetrachloroethene (PCE)	0.2 - 40.0	5 (100)	MCL (RMEG)
1,1-Dichloroethene (DCE)	0.5 - 2.0	7 (0.06)	MCL (CREG)

MCL - Maximum Contaminant Level CREG - Cancer Risk Evaluation Guide (one in a million risk) RMEG - Minimum Risk Level (for Children)

ppb - parts per billion

Table 3.

Exposure Dose From Ingestion Of Drinking Water

Chemical	Maximum Detected Level (ppb)	Estimated Adult Exposure Dose (mg/kg/day)	Estimated Child Exposure Dose (mg/kg/day)	Health Guideline (mg/kg/day)	Guideline Source
Trichloroethene (TCE)	91	0.003	0.009	NA	-
Tetrachloroethene (PCE)	5.8	0.0002	0.0006	0.01	RfD
1,1-Dichloroethene (DCE)	7.2	0.0002	0.0007	0.009	RfD

mg/kg/day -milligrams per kilogram per day
ppb - parts per billion
RfD - USEPA reference dose
NA - no chronic minimal risk level (MRL) is available; the acute MRL is not applicable under site conditions because exposure may have occurred for up to 17 years.

Table 4.

Completed Exposure Pathways

Pathway Name	Source	Medium	Exposure Point	Exposure Route	Receptor Population	Time of Exposure	Exposure Activities	Estimated Number Exposed	Primary Chemicals
Evergreen Manor Ground water	Unknown, Off the site	Ground Water	Water Faucets	Ingestion Inhalation Dermal	Residents	Past, Present	Domestic Use of Well Water	700	Trichloroethylene Tetrachloroethylene 1,1-Dichloroethylene

Table 5.

Potential Exposure Pathways

Pathway Name	Source	Medium	Exposure Point	Exposure Route	Receptor Population	Time of Exposure	Exposure Activities	Estimated Number Exposed	Primary Chemicals
Evergreen Manor Ground Water	Unknown, Off the site	Ground Water	Water Faucets	Ingestion Inhalation Dermal	Residents outside the current contamination plume	Future	Domestic Use of Well Water	200	Trichloroethylene Tetrachloroethylene 1,1-Dichloroethylene
Rock River	Unknown, Off the site	Surface Water	Rock River	Ingestion Inhalation Dermal	Persons using the river	Past Present Future	Recreational Use of the River	100	Trichloroethylene Tetrachloroethylene 1,1-Dichloroethylene

ATTACHMENTS

Attachment 1. Evergreen Manor Site Location

Attachment 2. Evergreen Manor Site and Groundwater Contamination Plume

Attachment 3

Comparison Values Used In Screening Contaminants For Further Evaluation

Maximum Contaminant Levels (MCLs) have been established by USEPA for public watersupplies to reduce the chances of adverse health effects from contaminated drinking water. These standards are well below levels for which health effects have been observed and take intoaccount the financial feasibility of achieving specific contaminant levels. These are enforceablelimits that public water supplies must meet.

Reference Dose Media Evaluation Guides (RMEGs) are another type of comparison valuederived to protect the most sensitive populations. They do not consider carcinogenic effects,chemical interactions, multiple route exposure, or other media-specific routes of exposure, andare very conservative concentration values designed to protect sensitive members of the population.

Cancer Risk Evaluation Guides (CREGs) are estimated contaminant concentrations based on aprobability of one excess cancer in a million persons exposed to a chemical over a lifetime.These are also very conservative values designed to protect sensitive members of the population.

CERTIFICATION

This Evergreen Manor Groundwater Contamination Site Public Health Assessment was preparedby the Illinois Department of Public Health under a cooperative agreement with the Agency forToxic Substances and Disease Registry (ATSDR). It is in accordance with approved methodology and procedures existing at the time the public health assessment was begun.

Gail D. Godfrey
Technical Project Officer
Division of Health Assessment and Consultation
ATSDR

The Division of Health Assessment and Consultation, ATSDR, has reviewed this public health assessment and concurs with its findings.

Lisa C. Hayes
for Richard E. Gillig
for Chief, State Programs Section
Division of Health Assessment and Consultation
ATSDR

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