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1 <br /> 4 is <br /> as diesel (TPH-diesel), none detected to 20 ppm total? petroleum <br /> hydrocarbons calculated as oil (TPH-oil), with no detectable <br /> concentrations of total petroleum hydrocarbons calculated;as gasoline <br /> (TPH-gasoline) in Wells U-7 and U-8. There were no� detectable <br /> concentrations of petroleum hydrocarbons in Wells U-9 and U-10. <br /> Hydrocarbon concentrations were at a maximum at depths between <br /> 5 and 6-1/2 feet. Hydrocarbon concentrations generally attenuate to <br /> none detected at depths greater than 10 feet west and east of the site. <br /> o Static groundwater occurred at a depth of approximately 9i feet below <br /> grade during the March 31 and April 1, 1992, sampling event, with a <br /> northerly flow direction at a gradient ranging from 0.003 to 0.006. <br />�. o Certified laboratory analysis of groundwater samples c�1lected on <br /> March 31 and April 1, 1992, indicates concentrations of TPH-gasoline <br /> ranging from none detected to 970 parts per billion (ppb), of d benzene <br /> C, concentrations ranging from none detected to 330 ppb with the highest <br /> values in Well U-6. There were no detectable concentrations of <br /> TPH-diesel in any of the wells examined. <br /> i <br /> 4 <br /> i. <br /> 3 <br /> °i. <br /> i a <br /> 3100103/REPORT3 ii. June 11, 1992 <br />