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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/R05-85/016
ROD Date:  06/10/1985
Operable Unit(s):  01
 
Media:  GROUNDWATER
 
Contaminant:  1,1-DICHLOROETHANE, 1,1-DICHLOROETHENE, 1,1,1-TRICHLOROETHANE, TETRACHLOROETHENE, TRICHLOROETHENE, VOCS
 
Abstract:  THE EAU CLAIRE MUNICIPAL WELL FIELD CONSISTS OF A 500-ACRE SITE LOCATED IN THE NORTHWEST CORNER OF THE CITY OF EAU CLAIRE, WISCONSIN. THE EAU CLAIRE MUNICIPAL WELL SYSTEM SUPPLIES DRINKING WATER TO APPROXIMATELY 57,500 RESIDENTS AND TO NUMEROUS COMMERCIAL AND INDUSTRIAL ESTABLISHMENTS IN THE CITY OF EAU CLAIRE AND THE TOWN OF WASHINGTON. IN MARCH 1981, AS PART OF THE U.S. ENVIRONMENTAL PROTECTION AGENCY GROUNDWATER SUPPLY SURVEY, THE WISCONSIN DEPARTMENT OF NATURAL RESOURCES (WDNR) TESTED THE EAU CLAIRE MUNICIPAL WATER SUPPLY FOR VOLATILE ORGANIC COMPOUNDS. THE FOLLOWING ORGANIC COMPOUNDS WERE IDENTIFIED IN THE MUNICIPAL WATER SUPPLY; 1,1-DICHLOROETHENE, 1,1-DICHLOROETHANE, 1,1,1-TRICHLOROETHANE, AND TRICHLOROETHENE.

THE SELECTED REMEDIAL ACTION INCLUDES CONSTRUCTION OF AIR STRIPPING FACILITIES TO REMOVE VOLATILE ORGANIC COMPOUNDS FROM THE CONTAMINATED FLOW (14 MILLION GALLONS PER DAY (MGD)) FROM THE NORTH WELL FIELD. THE TREATED WATER WILL BE DISCHARGED INTO THE MUNICIPAL WATER TREATMENT PLANT AND DISTRIBUTION SYSTEM. TOTAL CAPITAL COST FOR THE SELECTED REMEDIAL ALTERNATIVE IS ESTIMATED TO BE $1,420,000 WITH O&M COSTS ESTIMATED TO BE AN ADDITIONAL $195,000 PER YEAR.
 
Remedy:  CONSTRUCT AIR STRIPPING FACILITIES TO REMOVE VOLATILE ORGANIC COMPOUNDS FROM THE CONTAMINATED FLOW (14 MILLION GALLONS PER DAY (MGD)) FROM THE NORTH WELL FIELD. THE TREATED WATER WILL BE DISCHARGED INTO THE MUNICIPAL WATER TREATMENT PLANT AND DISTRIBUTION SYSTEM.
 
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