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Firestone T_*e and Rubber Company r <br /> Stockton, CA., Soil Sampling Results Page 3 <br /> Aft <br /> Additionaa soils were excavated fromthe 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 £Held by the PHS inspector, Harlin Knoll. <br /> i <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 tenon tape; capped, logged, and placed on ice. <br /> Diesel c=,entrations were reported in minor concentrations in both samples; <br /> raniring from 2.1 to 2.4 mg/kg. PCBs were not reported by the laboratory. Based. z <br /> onthe laboratory roaults there appears to be no significant hydrocurban release <br /> from the Tank 16 site. <br /> Re <br /> I... Tank sites 6 and 16{land previous tanks 8 through 15}require no adilitional <br /> soil analysis or resampling work. TMese 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 *ark 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$I the side walls';and bottom of the excavation at Tank 5 site <br /> will be sampled and analyzed for TPH and BTX&E, <br /> F <br /> f <br /> II <br /> r <br />