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Mr Harlin Knoll May 1998 Page 5 i ' southern (UST2-3) sidewalk contained TPH-g concentrations of 20 mg/kg and 550 mg/kg, respectively Low concentrations of BTEX compounds were detected in all samples collected TPH-g was detected at a concentration of 84 mg/1 in UST2-GW1 Concentrations of BTEX compounds were also detected within this sample ' Soil stockpile samples were collected for waste profiling purposes prior to removal of the soils from the site Stockpile samples for waste ' characterization were collected and analyzed for TPH-g, BTEX, and LUFT Metals using EPA Methods 6010 and 7000 All impacted soils were loaded, hauled and disposed of at Forward, Inc , landfill in Stockton, California, a Class II non-hazardous waste landfill Cement slurry removed from UST #2 and debris from the removal of surface pavements ' and slabs were also transported and disposed of at Forward, Inc , landfill Copies of the soil and debris transportation and disposal manifests for all excavation activities are included in Attachment 1 Liquids removed from UST #1 were transported and disposed of at Evergreen Oil, Inc , in Newark, California Copies of the liquid transportation and disposal manifests are included in Attachment 1 tGround water removed during the excavation activities was stored on- site for subsequent treatment and disposal as described in the following ' subsection Additional Soil Excavation and Ground Water Removal After reviewing the analytical data collected during the UST removals, the County requested that additional soil and ground water removal be ' conducted to remove additional petroleum contamination in soil and ground water at both the UST #1 and UST #2 excavations On 9 March 1998, ERM performed additional soil and ground water removal ' activities at each former UST location ERM excavated soil from the north, east and west sidewalls of the excavation for UST #1 and from the ' east and west sidewalls of the excavation for UST #2 Approximately 4,000 gallons of ground water were removed from each excavation during the soil removal activities As during the initial excavations, all ' soils removed from the excavations were placed on and covered with 10 mil plastic sheeting for subsequent disposal off-site Ground water was pumped to a temporary storage tank for subsequent treatment and rdisposal To ensure that the soil and ground water contamination had been removed to the County's satisfaction, ERM collected soil and ground