Superfund Record of Decision (EPA Region 5): Eau Claire Municipal Well Field, Eau Claire County, Wisconsin (First Remedial Action), March 1988

摘要

The 500-acre Eau Claire Municipal Well Field (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) ft(3) and 2.6 x 10(8) ft(3), respectively. 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 the site is proposed in the report. The estimated capital cost for the remedial action is $1,214,200 with annual O&M of $396,700.