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2.3.1 Fueling Area <br /> One 5,000-gallon diesel UST, one 10,000-gallon gasoline UST and a dispenser island with two <br /> dispensers were used for OMS operations vehicle fueling. The USTs were removed in April <br /> 1996 (Seward Schreder Construction, 1996). Releases of diesel fuel and gasoline appear to have <br /> occurred from the two UST, although benzene and toluene were not detected in soil samples <br /> collected at the time of UST removal. The highest concentrations of TPH-d and TPH as gasoline <br /> (TPH-g) detected in soil were 12,000 mg/kg and 7,100 mg/kg, respectively. The highest <br /> concentrations of the aromatic hydrocarbons, ethylbenzene and total xylene isomers, detected in <br /> soil were 6.2 mg/kg and 580 mg/kg, respectively. No MTBE was detected in soil samples <br /> collected from the Site. The highest lead concentration detected in soil was 10 mg/kg. <br /> Versar advanced two borings in March 2000 at the former location of the two USTs. The <br /> borings were advanced to 25 feet in depth and sampled at 10, 15, and 20 feet bgs for petroleum <br /> hydrocarbons as gasoline and diesel fuel. TPH-g and TPH-d were detected in each boring at a <br /> depth of 25 feet. One boring contained soil concentrations of TPH-g and TPH-d of 25.4 mg/kg <br /> and 209 mg/kg, respectively. The second boring contained soil concentrations of TPH-g and <br /> TPH-d of 5.9 mg/kg and 8.13 ma/kg, respectively. <br /> 2.3.2 Vehicle Inspection Rack <br /> Versar detected petroleum hydrocarbons in March 2000 in shallow soil in the area of the vehicle <br /> inspection rack. The release appears to impact soil to depths greater than 10 feet bgs, and may, <br /> therefore,present a potential impact to groundwater. Jet fuel-weight petroleum hydrocarbons <br /> were detected at a concentration of 10,500 mg/kg at the south end of the vehicle inspection rack. <br /> Oil-weight petroleum hydrocarbons were also detected in soil at this location at a concentration <br /> of 153 mg/kg. TPH-g and TPH-d were detected at concentrations of 9.24 mg/kg and 14.2 mg/kg, <br /> respectively. Volatile organic compounds (VOCs) were not detected in soil vapor at the 10-foot <br /> depth. <br /> 5 <br /> 3027-03/104700.4766.230/JUL23'03 <br />