Under contract to Malcolm Pirnie, TRS Group, Inc. (TRS) designed, installed and operated the ERH remediation sys- tem at this dry cleaner facility in an active alley behind a shopping mall. The goal of the remediation project was to reduce tetrachloroethene (PCE) concentrations in soil to less than 11 milligrams per kilogram (mg/kg). While site soil also contained other chlorinated volatile or- ganic compounds (CVOCs), PCE was the most preva

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