HOPEWELL JUNCTION, NY
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The Hopewell Precision Site is located in Hopewell Junction in the Town of East Fishkill, Dutchess County, New York. Hopewell Precision, Inc. has operated at either 15 or 19 Ryan Drive since the early 1970's manufacturing sheet metal parts and assemblies. Various painting and degreasing processes used at these locations generated wastes that were reportedly disposed of directly on the ground, resulting in a groundwater contamination plume which now extends about 1.5 miles in a southwesterly direction from 15 and 19 Ryan Drive. The area surrounding the Site is mostly residential, all of which is served by private drinking water wells and septic systems.
What Has Been Done to Clean Up the Site?
EPA began its cleanup efforts in March 2003. Carbon filtration systems were installed at contaminated wells. Point-of-entry-treatment (POET) systems, which are highly effective in removing volatile organic compounds (VOCs) from drinking water, have been installed in 41 homes. At 53 homes where indoor air showed elevated concentrations of VOCs, EPA installed sub-slab ventilation systems (SVS), which have been successful in addressing vapor intrusion problem. Drinking well and soil gas monitoring is ongoing. Should EPA identify additional affected residences, the Agency will install POET systems and/or SVS in those residences. EPA is working to determine whether, under current conditions, there are any potential or actual human exposures to contaminants at the site. Sampling results from June 2013 found all deep bedrock private well water is clean and free of all VOCs.
What Is the Current Site Status?
EPA has divided the Hopewell Precision site into two OUs. OU 1 addresses remediation and restoration of the contaminated groundwater to drinking water standards by using naturally-occurring microorganisms that break contaminants down, making them harmless. OU 2 includes provision of an alternate water supply to the area with private drinking water wells that have been or have the potential to be affected by the groundwater plume from the Hopewell Precision facility. The OU 2 Record of Decision (ROD) was completed in September 2008 and the OU 1 ROD was completed in September 2009.
The OU 2 Remedial Design activities began in July 2009; the OU 2 Remedial Design was completed in July 2016. A request for proposal for construction of the water supply infrastructure was issued in May 2017 and an award to a construction contractor is anticipated in Fall 2017. Site mobilization and construction would not occur until construction contractor workplans are completed and is estimated to be in Spring 2018.
The OU 1 Remedial Design began in September 2010. Due to declining TCE and 1,1,1-TCA concentrations in groundwater, EPA is presently evaluating whether monitored natural attenuation (MNA) can be an effective remedy in achieving drinking water standards within a reasonable time period. If MNA is determined to be effective in restoring groundwater, EPA will amend the OU 1 remedy selected in the September 2009 ROD.