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r z <br /> t <br /> AGS Job No. 38032-1 <br /> July 8, 1988California <br /> UNOCAL Service Station. No. 6981, Stockton, <br /> was filen out by <br /> the geologist in the field and accompanied the <br /> samples to the laboratory. <br /> collected from the test pits <br /> Laboratory results of soil. samples <br /> indicated that total petroleum hydrocarbon levels ranged from <br /> detection limits to 382 parts per million <br /> below the laboratory <br /> (ppm) . One 8-foot-deep test pit was excavated in response to <br /> high measurements ,if hydrocarbons using an organic vapor analyzer <br /> at 4 feet below grade. The laboratory <br /> analytical results cf the <br /> soil sample (S-B-LIPSE9) collected at 8 feet below grade indicated <br /> _ <br /> were present at nondetectable <br /> that total petroleum hydrocarbons <br /> fi`•J levels. Resuof initial analyses are presented in "_' <br /> lts able I. <br /> y Analysis Reports are <br /> Copies of the laboratorincluded in the <br /> is report. Sample locations are shown <br /> Appendix of th7n tn�' <br /> Sample Location Map (Plate P-4) . <br /> At the request of BNOCAL and with the approval of the San Joaquin <br /> Local Health District, Applied GeoSystems Observed further <br /> excavation an May 19 and 2U, 1988, in areas where previously <br /> collected samples showed detectable amounts of contaminants• <br /> Results of this further excavation revealed contamination present <br /> wn the soil to approximately 20 feet below grade at two <br /> ---- --- -- - — -- roximately--2_g� - ----- --- . <br /> locations. Contaminated soil was excavated-to app <br /> feet below .grade, or the limit of the excavating equipment, in <br /> ` 5 <br /> APP11,90' Geosyst,91"s <br />