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Record of Decision System (RODS)

EAU CLAIRE MUNICIPAL WELL FIELD

Abstract

Site Name:  EAU CLAIRE MUNICIPAL WELL FIELD
Address:  SEC5 T27N R9W 
City & State:  EAU CLAIRE  WI  54701
County:  EAU CLAIRE
 
EPA ID:  WID980820054
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-88/064
ROD Date:  03/31/1988
Operable Unit(s):  01
 
Media:  GROUNDWATER
 
Contaminant:  PCE, TCE, VOCS
 
Abstract:  THE 500-ACRE EAU CLAIRE MUNICIPAL WELL FIELD (ECMWF) SITE IS LOCATED IN NORTHWESTERN EAU CLAIRE COUNTY AND SOUTHWESTERN CHIPPEWA COUNTY, WISCONSIN, AT THE CONFLUENCE OF THE EAU CLAIRE RIVER AND THE CHIPPEWA RIVER. ECMWF SUPPLIES DRINKING WATER TO APPROXIMATELY 57,600 RESIDENTS AND NUMEROUS COMMERCIAL ESTABLISHMENTS IN THE CITY OF EAU CLAIRE AND WASHINGTON TOWNSHIP. GROUND WATER FROM FIVE MUNICIPAL WELLS IN THE NORTH WELL FIELD IS CONTAMINATED WITH VOCS. THE CONTAMINATION AT THE ECMWF SITE HAS BEEN CHARACTERIZED AS TWO SEPARATE PLUMES WITH THE ESTIMATED VOLUME OF CONTAMINATION AT PLUME 1 AND 2 OF 1.9 X 10(8) FT3 AND 2.6 X 10(8) FT3, RESPECTIVELY. THE CHIPPEWA RIVER IS NOT BELIEVED TO BE AFFECTED BY THIS VOC CONTAMINATION DUE TO MUNICIPAL WELL PUMPING WHICH PREVENTS GROUND WATER DISCHARGE INTO THE RIVER. IN MARCH 1981, AS PART OF THE EPA GROUND WATER SUPPLY SURVEY, THE WISCONSIN DEPARTMENT OF NATURAL RESOURCES (WDNR) TESTED THE EAU CLAIRE MUNICIPAL WATER SUPPLY FOR VOCS AND DID NOT DETECT VOCS AT LEVELS OF IMMEDIATE CONCERN. ADDITIONAL TESTING OF THE CITY'S ACTIVE PRODUCTION WELLS, IN JANUARY 1982, REPORTED VOC CONCENTRATIONS BELOW HEALTH ADVISORY LEVELS. CONCERNED ABOUT THE FUTURE USE OF THE WATER SUPPLY, ADDITIONAL TESTING IN SEPTEMBER 1982 AND JANUARY 1983 WAS CONDUCTED TO IDENTIFY THE SOURCE AND EXTENT OF VOC CONTAMINATION. SEVERAL RESIDENTIAL WELLS REPORTED DETECTABLE LEVELS OF VOCS INCLUDING, 1,1-DICHLOROETHENE CONCENTRATIONS IN EXCESS OF THE WDNR HEALTH ADVISORY. THE EAU CLAIRE SITE WAS GIVEN A HIGH SUPERFUND NPL PRIORITY BY WDNR DUE TO THE NATURE OF THE TOXICITY AND PERSISTENCE OF THE CONTAMINANTS AND THE LARGE POPULATION AFFECTED. THE PRIMARY CONTAMINANTS OF CONCERN AFFECTING THE GROUND WATER ARE VOCS AND INCLUDE; CHLOROFORM, DCE, DICHLOROETHENE, PCE, TCE, AND TRICHLOROETHANE.

THE SELECTED REMEDIAL ACTION FOR THIS SITE INCLUDES; GROUND WATER PUMP AND TREATMENT USING THE EXISTING AIR STRIPPER WITH DISCHARGE OF TREATED WATER TO THE MUNICIPAL WATER SYSTEM AND THE UNTREATED WATER TO THE CHIPPEWA RIVER; AND PROVISION OF MUNICIPAL WATER TO PRIVATE WELL USERS WITHIN OR NEAR THE AREA OF GROUND WATER CONTAMINATION. THE ESTIMATED CAPITAL COST FOR THIS REMEDIAL ACTION IS $1,214,200 WITH ANNUAL O&M OF $396,700.
 
Remedy:  THE FINAL GROUNDWATER REMEDY FOR THE SITE WAS DEVELOPED TO PROTECT PUBLIC HEALTH AND THE ENVIRONMENT BY PREVENTING INGESTION AND INHALATION OF CONTAMINANTS FOUND IN THE GROUNDWATER, AND BY RESTORING THE CONTAMINATED AQUIFER.
THE MAJOR COMPONENTS OF THE SELECTED REMEDY ARE AS FOLLOWS;
- TREAT CONTAMINATED MUNICIPAL WATER WITH AN EXISTING AIR STRIPPER;
- PROVIDE MUNICIPAL WATER TO PRIVATE WELL USERS WITHIN OR NEAR THE AREA OF GROUNDWATER CONTAMINATION;
- INSTALL GROUNDWATER EXTRACTION WELLS IN THE PLUMES OF CONTAMINATION; AND
- DISCHARGE UNTREATED GROUNDWATER FROM EXTRACTION WELLS TO THE CHIPPEWA RIVER.
 
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