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1 <br /> 4 <br /> July 28, 1988 AGS Job No. 38012-2 <br /> _1 Former UNOCAL Service Station, Stockton, California <br /> OA <br /> walls of the excavation to a depth of 7 to 8 feet. An excavator <br /> was lowered onto this bench and continued to excavate below the <br /> former tanks to a total depth of 2E feet. <br /> ouring excavation, an attempt was made to segregate relatively <br /> contaminated soil from relatively uncontaminated soil using a <br /> field organic vapor analyzer. Several samples were taken at <br /> random locations within the relatively contaminated soil, <br /> composited into one sample by the laboratory, and analyzed for <br /> total petroleum hydrocarbons (TPH) by Environmental Protection <br /> Agency (EPA) Method 8015 (modified for gasoline) and the volatile <br /> organic constituents benzene, toluene, ethylbenzene, and total <br /> xylene isomers (BTEX) by EPA Method 8020. This procedure was <br /> also used to characterize the relatively uncontaminated soil. <br /> Additional soil samples were taken from the base of the deepened <br /> e:tcavation in the manner described above and analyzed for TPH, <br /> BTEX, and organic lead. The results of these analyses are shown <br /> in Tables 3 and 2. on April 7, 1988, excavated soil that had <br /> been stockpiled at the site was removed to the yard of North Cal <br /> 4 <br /> TPS --- <br /> LApplleal 0e0SySfe/ <br />