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F <br /> d <br /> August 8, 1988 AGS Job No. 38053-1 <br /> Former Texaco Service Station, Manteca, California <br /> approximately 11 feet below grade beneath the gasoline tanks, and <br /> 7 feet below grade beneath the waste-oil tank. Results of <br /> Hs laboratory analyses for these samples indicate that the soil had <br /> been contaminated with hydrocarbon product. Total petroleum <br /> hydrocarbon concentrations ranged from 5.1 parts per million <br /> (ppm) beneath the waste-oil tank to 100 ppm beneath the super- <br /> unleaded and regular-leaded gasoline tanks. The initial results <br /> of soil sample analyses are presented in Table 1. <br /> a� <br /> In response to the detected contamination, the tank cavity was <br /> further excavated and a soil sample was collected from <br /> �►`' :, ' approximately 18 feet below grade. Laboratory results of the <br /> soil sample collected at this depth revealed levels of total <br /> volatile hydrocarbons of 580 ppm, and total lead levels of 29.5 <br /> �+e ppm. Analytical results of the ground-water sample collected at <br /> approximately 20 feet below grade from the excavation showed <br /> levels of total xylene isomers in excess of the allowable limit <br /> defined by the California Department of health Services <br /> (0.62 ppm) . Results of these analyses are presented in Table 2. <br /> lir <br /> APV1 VO' Gc?OSYWems <br />