Roux Associates has been remediating the Recticon/Allied Steel site, located in Parker Ford, Pennsylvania, for over 15 years and has achieved site closure. In their third five-year review, the United States Environmental Protection Agency (EPA) officially recognized that the remediation of the Recticon/Allied Steel site has achieved the Remedial Action Objectives (RAOs) and that no further action is necessary – 15 years earlier than expected.
Since 1979, when the Pennsylvania Department of Environmental Protection (PADEP) detected trichloroethylene (TCE) in the groundwater beneath the site, TCE was found in the Recticon (silicon wafer manufacturer) drain lines, in sludge trapped within buried waste lines, and in soil. Allied Steel Products Corporation fabricated steel since 1972 on the adjacent property, and in 1984, Allied Steel identified leakage of TCE in the compressor room. High concentrations of TCE were detected in Allied Steel’s on-site well and private wells sampled by the EPA.
The site was listed on the National Priorities List in 1989. The remediation selected in the Record of Decision included soil excavation, extending a public water supply line and groundwater pump and treat, which started in 1997. In 2003, Roux Associates demonstrated that monitored Natural Attenuation (MNA) would achieve the RAOs for groundwater (the other activities had been completed and groundwater was the only remaining affected medium), replacing the pump and treat system. In 2005, the EPA issued an Explanation of Significant Difference approving the enhanced MNA remedy. By 2011, the enhanced MNA achieved the RAOs and after 12 quarters of groundwater monitoring data demonstrating the RAOs were achieved and maintained, the EPA, in their 2015 five-year review concluded:
“EPA will not conduct another five-year review for this [Recticon/Allied Steel] Site since the RAOs have been accomplished.”
Roux Associates is arranging for the decommissioning of the site.
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