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L <br /> L <br /> ! 7810 Thornton Road,Stockton,California <br /> L <br /> The vertical extent of the soil contamination as determined during this <br /> Linvestigation has been found to a maximum depth of 15 feet below ground <br /> surface in soil in the vicinity of the former underground storage tank excava- <br /> tion. Sandy backfill soils were encountered in soil borings SB-2 and SB-3. <br /> These soils had a slight petroleum odor; however, no measurement could be <br /> obtained using the PID. Laboratory analyses identified low concentrations of <br /> L total petroleum hydrocarbons as gasoline(TPHg),ethyl benzene and xylene in <br /> soil samples from these borings. <br /> Groundwater was not encountered during drilling activities and is presumed to <br /> Lbe present below a depth greater than 50 feet. <br /> L <br /> L <br /> L <br /> L <br /> L <br /> L <br /> L <br /> L <br /> L.1) 1 <br /> Project Number: USDO70192 Page 3 of 9 <br />