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April 7, 1992 <br /> tie April <br /> Service Station No. 760, Lodi, California <br /> In the new gasoline tank cavity, residual BTEX compounds were detected in the soil <br /> samples collected from 12 feet below grade at concentrations at or below 0 023 ppm <br /> Results of analyses of samples collected from borings B-7 and B-8 collected at 15 and 20 <br /> feet below grade indicated residual hydrocarbons were not detected Residual hydrocarbons <br /> were not detected in soil samples collected south and east of the new tank cavity but were <br /> detected in soil from the north sidewall of the new tank cavity at concentrations less than <br /> 0 0067 ppm <br /> Hydrocarbons were detected in two soil samples collected at the north end of the product <br /> dispensers Hydrocarbons were not detected in the remaining soil samples collected under <br /> and near the product dispensers <br /> CONCLUSIONS <br /> i <br /> Based on the results of this and previous investigations, we conclude the following <br /> o Residual hydrocarbons are delineated in soil vertically in the new tank cavity <br /> at 20 feet below grade rocarbons were detected in soil at the nort e <br /> I If <br /> i y, owever, at concentrations that in our opinion do no <br /> �waffffR=ffiffffEfwork <br /> o Residual gasoline and waste oil hydrocarbons were not detected in soil <br /> sampled from under former tank T8 <br /> o Residual hydrocarbons are delineated in soil to the west, north, and east of <br /> the former gasoline cavity, however, residual hydrocarbons are not delineated <br /> in soil vertically and to-the south of the former gasoline tank cavity <br /> o Residual hydrocarbons are delineated in soil to the east, and south of the <br /> product dispensers Further work is warranted to del in a hydrocarbons to <br /> the north of the dispenser islands Gt,q " <br /> o Residual gasoline and diesel hydrocarbons detected in soil near the former <br /> waste-oil tank cavity the May 1990 warrant further investigation 1114 <br /> 38048-5 17 <br /> i <br />