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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 />