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corresponding TPH-g concentrations This may be because of the age of the release, i.e., <br /> the BTEX constituents have vaporized and/or been biodegraded Significant hydrocarbon <br /> concentrations 'were not detected in the soil samples collected from Borings B-4 <br /> through B-8 <br /> Hydrocarbon concentrations were detected by the TPH-d analysis in a number of samples, <br /> however, it is noted that there is some 'overlap" between the gasoline and diesel <br /> hydrocarbon ranges detected by the two methods of analyses Most of the hydrocarbon <br /> concentrations reported in the TPH-d range appear to be attributable to gasoline-range <br /> hydrocarbons TRPH was not detected in the 11- and 16-foot samples collected from <br /> Boring B-3, which was drilled at the suspected former location of a waste oil tank <br /> 6 3 GROUND WATER QUALITY <br /> Ground water samples were collected from Borings B-2, B-3, and B-6 and analyzed for <br /> TPH-g, BTEX, and TPH-d. The results of these analyses, summarized in Table 2, show that <br /> elevated TPH-g and BTEX concentrations were detected in all three ground water samples <br /> Dissolved TPH-g concentrations ranged from 35 to 150 mg/e . Dissolved benzene <br /> concentrations ranged from 0.97 to 13 mg/e The highest concentrations were detected in <br /> the sample from Boring. B-2, located near the suspected former location of three gasoline <br /> tanks Boring B-6 was believed to be located upgradient of the former underground tanks, <br /> however, the relatively flat gradient (0 002 at the nearby BP station) and the proximity of <br /> Boring B-6 to the former tanks suggest that the hydrocarbons detected in the sample may <br /> be attributable to lateral spreading from the suspected source area near Borings B-1 <br /> and B-2 Detectable concentrations of hydrocarbons were reported in the TPH-d range, <br /> however, as with the soil samples, this apparently is the result of overlap between the <br /> gasoline and diesel hydrocarbon ranges The decontamination rinsate sample contained low <br /> concentrations of TPH-g (0170 mg/P_) and toluene (0 003 mg/e) <br /> 6-2 <br /> GE r' f Y4JTE�Mi <br /> Consultants, Inc <br />