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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


Table of Contents

  
 
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