Laserfiche WebLink
July 8, .1988 AGS Job No. 38032-2 <br /> go ';i`Al UNOCAL service Station No. 6961, Stockton, California <br /> southern end of the dispenser islands. These samples were <br /> collected in response to contamination encountered during <br /> installation of a gasoline-blending valve at the service station. <br /> Laboratory results of the soil samples :indicated t- tal petroleum <br /> hydrocarbon levels ranging from below the laboratory detection <br /> limits to 382 parts per million (ppm) . An 8-foot deep test pit <br /> was excavated in the area where relative measurements of total <br /> ' ,:•� petroleum hydrocarbons (using an organic vapor analyzer) were <br /> highest at 4 feet below grade. Laboratory analysis of a soil <br /> sample collected at 8 feet below grade indicated total petroleum <br /> - hydrocarbons were at nondetectable levels at this location. <br /> On May 19 and 20, 1988, UNOCAL's contractor further excavated <br /> soil in areas showing detectable amounts of contamination. 1 <br /> Results of this excavation revealed contamination present in two <br /> separate locations to depths of approximately 20 feet. <br /> Contaminated soil was excavated to approximately 20 feet below ` <br /> grade in areas where excavation .was not inhibited by the presence' <br /> of station structures. soil samples were collected from <br /> locations. where the soil appeared to be visibly clean and showed <br /> no hydrocarbon concentration on the organic vapor analyzer and <br /> from the limits of the excavation. Laboratory results of these <br /> soil samples showed levels of total petroleum hydrocarbons of <br /> 3 <br /> �4�plied Ge®Systeine <br />