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3 <br /> July 8, 1980 AGS Job No. 38032-1 w <br /> UNOCAL Service Station No. 6981, Stockton, California <br /> was filled out by the geologist in the field and accomp-:.pied the �. <br /> samples to the laboratory. <br /> 5 <br /> Laboratory results of soil samples collected from the t' st pits <br /> indicated that total petroleum hydrocarbon levels ranged from <br /> below tL;e labcratory detection limits to 382 parts per ;aillion <br /> (ppm) . One 8-foot-deep test pi.t was excavated in respo.lse to <br /> high measurements of hydrocarbons using an organic vapor analyzer <br /> at 4 feat below grade. The laboratory analytical results of the 3 <br /> soil sample (S-2-LINE9) collected at 8 feet below grade indicated <br /> that total petroleum hydrocarbons were present at nondetectable <br /> levels. Results of initial analyses are presented in Table 1. <br /> Copies of the laboratory Analysis Reports are included in the <br /> Appendix of this report. Sample locations are shown on the <br /> Sample Location Map (Plate P-4) . <br /> %t the request of UNOCAL and with the approval of the San Joaquin <br /> L' Local Health District, Applied GeoSystems observed further <br /> excavation On May 19 and 20, 1988, in areas where previously <br /> collected samples showed detectable amounts of contaminants. <br /> Fesults of this further excavation revealed contamination present <br /> in the soil to approximately 20 feet below grade at two <br /> locations. Contaminated soil was excavated to approxima'caly 20 <br /> feet below grade, or the limit of the excavating equipment, in <br /> 5 <br />