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June 1, 1988 AGS Job No. 038032-2 <br /> UNOCAL Service Station No. 6981, Stockton, California <br /> southern end of the dispenser islands. These samples were <br /> co.'.lected in response to contamination encouotered during <br /> installation of a gasoline blending valve at the service station. <br /> Laboratory results of soil samples collected indicated total <br /> petroleum hydrocarbon levels ranging from not detectable to 382 <br /> parts per million (ppm) . An 8-foot deep test pit was excavated <br /> in the area where OVA readings were highest at 4-feet below <br /> grade. The laboratory result of the soil sample collected at 8- <br /> feet below grade indicated total petroleum hydroca:_bons were not <br /> detectable at this location. <br /> ~� On May 19, 1988 and May 20, 1988, UNOCAL's contractor further <br /> excavat=d soil in areas showing detectable amounts of <br /> contaminants. Results of this excavation revealed contamination <br /> present in two separate locations to approximately 20 feet deep. <br /> Contaminated soil *,gas excavated to approximately 20 feet below <br /> Grade in areas not inhibited by the presence of structures. Soil <br /> samples were collected where the soil appeared visably clean and <br /> ed no hydrocarbon concentration on the OVA. Soil samples <br /> were also collected from the limits of the excavation. <br /> Laboratory results of these soil samples will be presented in <br /> Applied GeoSystems report no. 038032-1 regarding excavation <br /> results. <br /> 3 <br /> e �--APP11d90" GeOSYSZOM-9 <br />