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• I <br /> i <br /> l <br /> Firestone Tire and Rubber Company Page 3 <br /> Stockton, CA., Soil Sampling,Results <br /> f <br /> � 5 <br /> Additional c-oils were excavated from the existing excavation to a depth of 13 feet. j <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 them appears to be no significant hydrocarbon release i <br /> from the Tank 16 site. <br /> Rsco�mendatyon f <br /> 1. Tank sites 6 and 16 (and previous tanks'S 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. f <br /> 2. The additional soil sampling;lwork has confirmed the Work Plan 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 /> 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. y <br /> L <br /> I' <br /> hh <br /> f <br /> I k <br /> f <br />