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Prior Investigations <br /> Historical data exist concerning chemicals in soil and ground water <br /> beneath the site. Volatile organic compounds (VOCs), primarily <br /> halogenated VOCs (HVOCs) have been found in both soil and ground <br /> water beneath the site. Smaller amounts of aromatic VOCs have also been <br /> detected in soil beneath the site. <br /> Halogenated Volatile Organic Compounds (HVOCs) <br /> The principal HVOCs detected include 1,1-dichloroethane (1,1-DCA), <br /> 1,1,1-trichloroethane (1,1,1-TCA), vinyl chloride, trichloroethylene (TCE), <br /> and perchloroethylene (PCE). Concentrations as high as 270 ug/kg of <br /> vinyl chloride, 110 ug/kg of methylene chloride, and 480 ug/kg of both <br /> 1,1-DCA and 1,1,1-TCA were detected in soil in certain "hot spot areas" <br /> beneath the site. Previous ground water investigations showed vinyl <br /> chloride concentrations as high as 1,100 ug/L in one location (average <br /> 103 ug/L). <br /> Aromatic Volatile Organic Compounds <br /> Aromatic volatile organic compounds have also been identified in soil <br /> beneath the site. Small amounts of benzene (up to 18 ug/kg), and larger <br /> amounts of ethyl benzene and xylene (up to 130 and 2000 ug/kg, <br /> respectively) have been identified in isolated areas. <br /> Remedial Workplan A <br /> This HSP has been developed for soil and ground water remediation at <br /> the site. The remedial alternative chosen for ground water remediation <br /> includes a dual phase extraction system for the simultaneous extraction <br /> from a single extraction well of soil gas, ground water, and floating <br /> product. <br /> Eight extraction wells will be installed with extracted soil gas and ground <br /> water (including any entrained solids) routed through piping to the <br /> treatment system. The treatment system consists of six primary <br /> subsystems: <br /> • Vapor/Liquid Separator Subsystem; <br /> 1-3 <br />