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Backfilling <br /> The tank excavation was backfilled on the same day that the tank was <br /> removed The soils removed during excavation of the tank were used <br /> for backfill material Additional clean fill material was added as <br /> needed As the pit was backfilled, the material was compacted, and the <br /> area was then paved with asphalt <br />' Summary of Findings <br /> Former i # <br />' A release of petroleum products to soil and ground water from a 2,000- <br /> gallon underground fuel storage tank formerly located at Site #1 has <br /> been documented Investigations conducted at the site have defined <br /> the extent of the release The lateral and vertical extent of TPH and <br /> BTEX in soil at Site #1 is limited to a localized area in the vicinity of <br /> the former tank, in a zone between approximately 6 and 11 feet bgs <br /> Based on data obtained during the investigation, the volume of soils <br /> containing TPH as gasoline in excess of 100 mg/kg (ppm) at Site #1 is <br /> estimated to be approximately 200 to 300 cubic yards <br /> The extent of TPH and BTEX in ground water is also limited to a <br /> localized area in the vicinity of the former tank The results of <br /> quarterly ground water samples collected from site monitoring wells <br /> since April 1991 have shown a steady decline in the concentrations of <br /> TPH as gasoline and benzene in ground water since December 1992 <br /> ' All monitoring wells at Site #1 have been non-detect for these <br /> compounds except for well MW-5 <br /> Former Tank Site #2 <br /> ' The extent of the release of petroleum products to soil and ground <br /> water from a 500-gallon underground fuel storage tank formerly <br /> located at Site #2 was defined during the Phase I and Phase II <br /> ' investigations The lateral occurrence of TPH and BTEX in soils is <br /> limited to the area immediately northeast of the former tank location <br /> and the vertical occurrence is primarily limited to the 5-to-7 5-foot bgs <br /> ' depth interval Based on data obtained during the investigations, the <br /> volume of soils containing TPH as gasoline in excess of 100 mg/kg <br /> (ppm) at Former Tank Site #2 is estimated to be approximately 500 to <br /> 700 cubic yards <br /> 3-8 <br /> 1 <br />