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' waste landfill Approximately 200 tons of soil was removed from the tank <br /> excavation All ground water removed from the tank excavation was <br /> pumped to a temporary storage tank for subsequent treatment and <br /> disposal to the sanitary sewer The ground water was treated to non- <br /> detectable concentrations of total petroleum hydrocarbons as gasoline <br />' (TPH-g) and benzene, toluene, ethylbenzene, and xylenes (BTEX) using <br /> granular activated carbon prior to disposal In total, approximately 12,280 <br /> gallons of ground water was pumped from the excavation during soil <br />' excavation activities at former tank site 1 <br /> 2.3 SITE CHARACTERIZATION <br />' Following the soil and ground water removal activities, ERM conducted a <br /> soil and ground water investigation to determine the extent of soil and <br /> ground water impact in the vicinity of the former tank location The <br /> 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 two locations, <br /> o Collecting soil samples from directly above the water table <br /> (approximately 7 feet bgs) at seven locations, <br /> o Collecting ground water HydroPunch samples from five locations, and <br /> ® Installing and sampling one monitoring well (MW-1) 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 limited 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 immediate area downgradient of the former tank location <br />' Based on the results of the investigation, the PHS/EHD requested that <br /> two additional morutoring wells be installed to confirm the ground water <br /> flow direction and to determine the concentration of petroleum <br /> hydrocarbons immediately downgradient and upgradient of the former <br />' ERM 7 HEINZ USA-3374 60-3/27/00 <br />