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pumped from the excavation during soil excavation activities at former <br /> tank site 2 <br /> 33 SITE CHARACTERIZATION <br />' ERM conducted a soil and ground water investigation to determine the <br /> extent of soil and ground water impacts in the vicinity of the former tank <br />' location The initial investigation was conducted on 2 and 3 April 1998 <br /> As summarized in the Tank Removal Report, the investigation consisted <br /> of <br /> • Collecting soil samples from the unsaturated zone (approximately 3 to <br />' 5 feet bgs) at four locations, <br /> • Collecting soil samples from directly above the water table <br />' (approximately 7 feet bgs) at nine locations, <br /> • Collecting ground water HydroPunch samples from five locations, and <br />' • Installing and sampling one monitoring well (MW-2) downgradient of <br /> the former tank location (the assumed downgradient direction was <br /> based on water level data from surrounding sites provided by <br /> PHS/EHD) <br />' The results of this investigation indicated that shallow soil impacts in the <br /> vicinity of the former tank location were hnuted to the immediate vicinity <br /> of the tank and were removed during soil excavation activities Petroleum <br />' hydrocarbons were found in soil samples collected immediately above the <br /> water table, but were determined to be associated with movement of <br />' ground water Ground water impacts were determined to be limited to <br /> the area immediately downgradient of the former tank location <br />' Based on the results of the investigation, the PHS/EHD requested that <br /> two additional monitoring wells be installed to confirm the assumed <br /> ground water flow direction and to determine the concentration of <br />' petroleum hydrocarbons immediately downgradient and upgradlent of <br /> the former tank location Two additional monitoring wells (MW-5 and <br />' MW-6) were installed on 10 November 1998 The results of samples <br /> collected from these two wells indicated that petroleum hydrocarbon <br /> concentrations were present in ground water immediately downgradient <br />' of the former tank location, but upgradient concentrations were non- <br /> detectable <br />' ERM 13 HEINZ USA 3374 60.3/27/0a <br />