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i <br /> ' f <br /> Firestone Tire and Rubber Company Page 3 <br /> Stockton, CA., Soil Sampling Results <br /> Tank 16 <br /> Additional 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 wall of the excavation at 11 feet. Soil <br /> samples were analyzed for TPH and PCBs. The PCB analysis was requested in <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 /> Recommendation <br /> i <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 /> r�- as closed. <br /> 2. The additional soil sampling work has confirmed the Work Paan assumption <br /> that the apparent tank releases are localized at the Tank 5 site. ,Based on the <br /> Work Plan, the recommended remediation alternative for the"Tank 5 site is <br /> excavation of soils. <br /> Y <br /> After soil excavation, the side walls and bottom of the excavation at Tank 5 site <br /> will be sampled and analyzed for TPH-andBTX&E. <br />