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• <br /> approximately 6 feet bgs in the vicinity of the southern former UST The highest concentrations <br /> of benzene and MTBE (0 88 mg/Kg and 0 46 mg/Kg, respectively) were collected at a depth of <br /> approximately 10 5 feet bgs in compliance samples collected in the vicinity of the former <br /> northern USTs The current locations of petroleum hydrocarbon impact to soil occur in the <br /> vicinity of the former northern and southern USTs, and in an area northeast of the site centered <br /> on soil borings GP-7 and GP-9 The Iateral and vertical extent of petroleum hydrocarbon impact <br /> to soil has not been adequately assessed <br /> Historically, dissolved TPHD, total petroleum hydrocarbons as gasoline (TPHG), benzene, and <br /> MTBE have been reported in groundwater samples collected during groundwater monitoring <br /> activities at the site However, MTBE was the only petroleum hydrocarbon compound reported <br /> in the most recent monitoring event (second quarter, 2003) MTBE was reported in samples <br /> collected from 6 wells, at a maximum concentration of 780 micrograms per liter (�igfl The <br /> lateral extent of dissolved hydrocarbons has not been adequately characterized to the east and <br /> northeast of the site The vertical extent of the dissolved hydrocarbons has not been adequately <br /> characterized <br /> Water supply wells were not been identified within a 2,000-foot radius of the site during a search <br /> of Department of Water Resources (DWR) files in January 2000 There are no complete <br /> • pathways for exposure to residual or dissolved hydrocarbons at this site <br /> I <br /> I <br /> • <br /> P\Joe's Truck Plaza\Reports\SCM-09-2003\Joes truck plaza SCM doe Page 2 5TKATV5 <br />