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Page 3 <br /> Firestone Tire and Rubber Company <br /> ` Stockton, CA., Soil Sampling Results <br /> Tank 16 <br /> Addiiaonal soils were excavated from the existing excavation to a depth of 13 feet. <br /> At the request of the PHS, two soil samples were taken: bottom of the excavation <br /> at 13 feet below grade, and on the north all oT£hthe Pexcavation was requested in <br /> eet. Soil <br /> samples were analyzed for TPH and PCBs- <br /> the field by the PHS inspector, Harlin Knoll. <br /> Each soil sample was taken by driving a pre-cleaned brass tube into undisturbed <br /> soils within the excavation. After soil samples were taken, each brass tube was <br /> sealed with teflon tape, capped, logged, and placed on ice. <br /> Diesel concentrations were reported in minor concentrations in both samples; <br /> ranging from 2.1 to 2.4 mg/kg. PCBs were not reported by the laboratory. Based <br /> on the laboratory results there appears to be no significant hydrocarbon release <br /> from the Tank 16 site. <br /> 1. Tank sites 6 and 16 (and previous tanks 8 through 15) require no additional <br /> soil analysis or resampling work. These tank sites should be backfilled, <br /> compacted to PHS and San Joaquin County density standards, and reported <br /> as closed. <br /> 2. The additional soil sampling work has confirmed the Work Plan assumption <br /> that the apparent tank releases are calized at the es the Tank 5 site 5 site. Based onis e <br /> Work Plan, the recommended remediation alternative <br /> excavation of soils. <br /> After soil excavation, the side walls and bottom of the excavation at Tank 5 site <br /> will be sampled and analyzed for TPH and BTX&E. <br />