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ENVIRONMENTAL INVESTIGATION REPORT <br /> Unocal Service Station No 5886 <br /> 2701 West March Lane <br /> Stockton California <br /> t Delta Project No ID095-066 <br /> Page 19 <br /> ' USTs The location of the soil samples collected at 10 feet bsg or greater is shown on Figure 13, <br /> Residual TPH (Gasoline) Concentrations in Soil 10 Feet or Greater <br /> 1 <br /> 5.2 Residual Total Petroleum H dracarbons as Diesel <br /> ' Residual TPH as diesel was detected in five soil samples collected from three to five feet bsg These <br /> samples were collected east of the former northern dispenser island and north of the UST location <br /> ' Detectable concentrations ranged from 1 1 mg/kg to 3 5 mg/kg The location of the soil samples and <br /> their respective TPH as diesel concentrations are shown on Figure 14, Residual TPH (Diesel) <br /> ' Concentrations in Soil from 3 to 5 Feet Concentrations of Residual TPH (Diesel) Concentrations in Soil <br /> From 6 to 10 Feet are presented In Figure 15 Low concentrations (1 2 mg/kg to 4 9 mg/kg) of residual <br /> ' TPH as diesel were detected in soil samples collected near the USTs Higher concentrations (1 4 mg/kg <br /> to 120 mg/kg and 1 1 mg/kg to 1,100 mg/kg) were reported in the vicinity of the former northern and <br /> southern dispenser islands, respectively Detectable concentrations ranging 1 3 mg/kg to 5 0 mg/kg were <br /> reported in soil samples collected from geoprobe locations at 10 feet bsg or deeper The locations and <br /> ' concentrations of these samples are shown on Figure 16, Residual TPH (Diesel) Concentrations in Soil <br /> 10 Feet or Greater <br /> ' 6.0 SUMMARY <br /> Based on the field work performed to date, and the laboratory analytical results, the following summary <br /> ' is presented <br /> ' A Approximately 1,200 cubic yards of soil were removed from the site and disposed of at <br /> Forward Landfill in Stockton, California <br /> A Approximately 15,000 gallons of ground water were removed from the UST area during <br /> construction and recycled at Unocal's facility in Rodeo, California <br /> A Confirmation residual soil sample analytical results did not report detectable concentrations <br /> of benzene in any soil samples except one, GP-3-9 at 0 0093 mg/kg <br /> ' RPT 160 SJS <br />