The Hopewell Precision Site is located in the Hopewell Junction area of East Fishkill, Dutchess County, New York. Hopewell Precision is a sheet metal products manufacturer which was first investigated by EPA in 1979, and subsequently referred to the New York State Department of Environmental Conservation (NYSDEC) for further evaluation. The NYSDEC completed Phase I and Phase II Investigations of the Site during the 1980s, and in 1993 conducted split-sampling of on-site monitoring wells and nearby residential wells with Hopewell Precision. In 1994, the NYSDEC de-listed the Site from its Registry of Class 2 Inactive Hazardous Waste Disposal Sites.
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As part of EPA's Global List Assessment process, EPA's Removal Action Branch (RAB) sampled 75 residential wells in the vicinity of the Hopewell Precision facility in February of 2003. The analytical results for this sampling event identified five residential wells contaminated with trichloroethene (TCE) at concentrations up to 250 parts per billion (ppb). Based upon these findings, on March 25, 2003 the NYSDEC requested that EPA conduct a CERCLA Removal Action to mitigate the threat posed to residents by TCE contaminated groundwater at the Site.
EPA initiated a CERCLA Removal Action at the Site on March 26, 2003. EPA's groundwater investigation was eventually expanded to encompass 450 residential wells, and the subslab and/or indoor air sampling at more than 200 residences. As a result of this investigation, 41 residential wells have been found to be contaminated with TCE at or above the federal Maximum Contaminant Level (MCL). An additional 14 residential wells have been found to be contaminated with trichloroethane (TCA) at or above the NY state MCL. To mitigate the threat of exposure posed to the impacted residents, EPA has installed Point of Entry Treatment (POET) systems in all 41 residences exceeding the federal MCL for TCE. The NYSDEC has installed POET systems in all 14 residences exceeding the state regulatory limit for TCA. Additionally, the plume of TCE contaminated groundwater has resulted in the intrusion of TCE vapors into many homes overlying the plume, resulting in EPA's installation of vapor intrusion mitigation systems in 52 residences.
On April 27, 2005, the Site was listed on EPA's National Priorities List. The Record of Decision (ROD) for Operable Unit 1 (OU1) was signed on September 28, 2009, selecting 'Aerobic Cometabolic Bioremediation' for remediation of the TCE contaminated groundwater. The OU1 ROD also provides for vapor intrusion monitoring, and the installation and operation and maintenance (O&M) of vapor intrusion mitigation systems as needed. The ROD for Operable Unit 2 (OU2) was signed on September 30, 2008, selecting an 'Alternate Water Supply' as a means of supplying the impacted residents with a permanent source of potable water.
Pending implementation of the OU1 & OU2 Remedial Actions, RAB continues to fund the O&M of 42 POET systems and 56 vapor intrusion mitigation systems. RAB continues to fund the installation of additonal POET and vapor intrusion mitigiation systems as needed. The O&M of the 14 POET systems installed for the mitigation of groundwater contaminated with TCA continues to be funded by the NYSDEC.