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On February 5, 1998, based on the detection of elevated concentrations of gasoline <br /> hydrocarbons beneath the west dispenser island, PHS/EHD completed and filed an <br /> Unauthorized Release Form and directed that further site characterization be completed to <br /> determine the full nature and extent of contamination <br /> On February6 1998 under PHS/EHD observation West Hazmat Drilling Corporation drilled two <br /> 9 <br /> sod borings in the vicinity of the south end of the west dispenser island (Figure 3) The first soil <br /> boring (D-1) was positioned approximately 20 feet west of the former UST excavation and drilled <br /> vertically to a total depth of 20 feet below ground surface (bgs) From D-1, soil samples were <br /> collected for laboratory analysis from 15 and 20 feet bgs The second soil boring (D-2) was <br /> located to the south and west of the former west dispenser and drilled at an angle of 30 degrees <br /> off-vertical The boring was angled under the former dispenser and drilled to a total vertical <br /> depth of approximately 23 feet bgs From D-2, soil samples were collected for laboratory <br /> analysis from approximately 14 and 23 feet bgs (vertical depth) All four of the soil samples were <br /> analyzed for TPH-as-gasoline and BTEX by Modified EPA Method 8020/8015 and for MTBE by <br /> EPA Method 8260 <br /> On February 12, 1998, under PHS/EHD observation, L&M Construction excavated <br /> approximately 60 cubic yards of impacted soil from the vicinity of the west dispenser island The <br /> depth of the excavation ranged from approximately 7 feet near the former dispenser to <br /> approximately 12 feet beneath the former underground product distribution piping The <br /> excavated soil was stockpiled on site and remediated by passive aeration <br /> On October 1, 1998, under PHS/EHD observation, FGL Environmental re-sampled the soil <br /> stockpile Two soil samples were collected from the accumulated soil stockpile for laboratory <br /> composite and analysis The composite soil sample was analyzed for TPH-as-gasoline and <br /> BTEX by Modified EPA Method 8020/8015 and for oxygenates by EPA Method 8260 Based on <br /> the results of the soil sample analyses, PHSIEHD allowed the soil stockpile to be disposed of <br /> on-site <br /> On October 1 1998 under PHS/EHD observation FGL Environmental also sampled the one <br /> on-site water supply well One water sample was collected from the on-site water supply well, <br /> located approximately 100 feet northwest of the former gasoline USTs (Figure 2) The sample <br /> was analyzed for TPH-as-gasoline and BTEX by Modified EPA Method 8020/8015 and for <br /> oxygenates by EPA Method 8260 None of the analytes were detected in the water sample <br /> Well construction details were not available <br /> 2 <br /> i <br />