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7.1 Tank Replacement <br /> Four single-wall USTs and associated piping were removed and four double-wall, fiberglass <br />' USTs and associated double containment piping were installed at the Site. The new USTs were <br /> installed in the same general area of the Site as the former USTs. Six conductor casings were <br />' installed between the new USTs to enable the drilling of future soil bonngs or vapor extraction <br /> wells in the new tank cavity area (Figure 4) <br /> 1 <br />' 72 Petroleum Hydrocarbons in Soil Below the Removed Tanks <br />' Laboratory analyses of eight soil samples collected from below the removed gasoline tanks at <br /> a depth of 16 ft. bgs indicated TPH-G concentrations ranging from non-detected to 4,000 mg/kg <br /> (ppm), BTEX concentrations ranging from non-detected to 620 mg/kg, and total lead <br /> concentrations ranging from 6 4 mg/kg to 28 mg/kg (Table 1). Ethylene dibromade was not <br /> present above the method detection limits in the four samples analyzed. Soil samples T1A, T2A <br /> and T4A, collected below the fill ends of USTs T1, 72, and T4, contained the highest <br />' concentrations of TPH-G and BTEX (Figure 3). <br /> 7.3 Petroleum Hydrocarbons in Soil Below the Removed Product Lines <br /> Laboratory analyses of five soil samples collected from below the removed product lines and <br /> ' pump islands at depths of 2 5 ft. bgs indicated TPH-G concentrations ranging from not detected <br /> to 1,600 mg/kg and BTEX concentrations ranging from not detected to 200 mg/kg (Table 1) <br /> Soil sample L2 and L3 contained the highest concentrations of TPH-G and BTEX (Figure 3) <br /> ' ROUX 8 Doc #A158W0117 <br />