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Mr Harkin Knoll . 22 May 1998 Page 4 a The bottoms of the UST pits were also excavated an additional two feet in order to remove impacted soils and facilitate ground water sample collection All soils removed from the excavations were again placed on and covered with 10 mil plastic sheeting for subsequent disposal off-site Approximately 4,000 gallons of ground water were pumped from each excavation during the soil excavation activities to aid in soil removal and to remove contaminated ground water The ground water was pumped to a temporary storage tank for subsequent treatment and disposal ERM collected sidewall soil d an es samP lground les from �' water samples each UST excavation Soil samples were collected from the northern, eastern, and western sidewalls of UST #1 (UST1-1, UST1-2, and UST1-3) and from the northern, southern, eastern, and western sidewalls of UST ' #2 (UST2-1, UST2-2, UST2-3, and UST2-4) No soil sample was collected from the southern sidewall of UST#1 due to the presence of a water pipe A ground water grab sample was also collected from each UST 10 excavation (UST1-GW1 and UST2-GW1) Analysis of soil samples included TPH as gasoline (TPH-g) using EPA tMethod 8015-Modified (8015M), TPH as diesel (TPH-d) using EPA Method 8015-Modified (8015M), lead using EPA Method 6010, and ' benzene, toluene, ethyl benzene, and xylenes (BTEX) and methyl tertiary butyl ether (MTBE) using EPA Method 8020 Analysis of ground water samples included TPH-g, TPH-d, lead, BTEX, and MTBE as well ' The analytical results for the soil and ground water samples collected in the vicinity of UST #1 are presented in Table 1 and copies of the ' laboratory analytical reports are included as Attachment 2 TPH-g was detected in all of the soil samples collected from the UST #1 excavation Concentrations of TPH-g ranged from 1,400 mg/kg along the northern ' (USTI-1) and western sidewalls (UST1-2) to 2,400 mg/kg along the eastern sidewall (UST1-3) In addition, low concentrations of BTEX ' compounds were detected in all three soil samples TPH-g was detected at a concentration of 45 mg/1 In UST1-GW1 Concentrations of BTEX compounds were also detected within this sample ' The analytical results for the soil and ground water samples collected in • the vicinity of UST #2 are presented in Table 2 TPH-g was detected in all soil samples collected from the UST #2 excavation Samples collected from the eastern (UST2-4) and western (UST2-2) sidewalls of the excavation contained TPH-g concentrations of 2,900 mg/kg and 7,600 mg/kg, respectively Samples collected from the northern (UST2-1) and