oconomowoc electroplating co., inc.

W2573 OAK STREET

The Oconomowoc Electroplating Company Inc. (OECI) Site was once an electroplating facility located at 2572 West Oak Street, in Ashippun, Wisconsin. The 10-acre OECI Site comprises 4-acres formerly occupied by the OECI facility (bounded by Elm, Oak, and Eva Streets, and the Town of Ashippun’s municipal garage), and 6 acres of adjacent wetland located to the southwest. Davy Creek flows through the adjacent wetland approximately 500 feet south of the treatment facility. The area immediately surrounding the OECI Site is a mixture of light industrial, commercial, municipal, and residential parcels. There is no municipal water supply, and the residents and businesses rely on groundwater from individual wells for their drinking water. Site Responsibility This site is being addressed through federal and state actions. The Remedial Action at the OECI Site was federally financed because the only identified Potentially Responsible Party formally declined to participate in the CERCLA process. Federal regulations allow federally financed remedial actions to proceed for a period of up to ten years after the remedy becomes Operational and Functional (O&F). EPA defines the ten year period between the O&F determination and the start of Operation and Maintenance (O&M) as a long-term response action (LTRA). After the ten year LTRA, federal regulations provide the statutory basis for the transfer of federally financed ground water and surface water restoration projects from an EPA directed LTRA to a State directed O&M program. The OECI Site was deemed O&F on May 7, 1999; the ten year LTRA expired May 7, 2009. The transfer of the OECI Site to a State led O&M program was delayed by the shutdown of the groundwater extraction and treatment system in 2004, which necessitated formally amending the ROD. The ROD was amended in May 2011, and the selected remedy for OU-3 was changed from groundwater extraction and treatment to source area removal or in situ treatment and MNA. Subsequent to the ROD amendment, EPA completed the in situ treatment of residual source areas at the site, and responsibility for O&M at the site was oficially transferred to the State in October 2014.

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