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GRANITE CONSTRUCTION FACILITY <br /> WKA No 2088 01 <br /> May 12, 1991 <br /> Page 4 <br /> Laboratory test results for soil samples P1 and P3 revealed non-detectable concentrations of TPH and <br /> BTEX Results for sample P2 revealed a TPH as gasoline concentration of 1 5 mg/kg, non-detectable <br />' concentrations of TPH as diesel and motor oil and BTEX Test results for sample P4 revealed a <br /> TPH as gasoline concentration of 130 mg/kg, a TPH as diesel concentration of 15,000 mg/kg, and <br /> non-detectable concentrations of BTEX <br /> Soils Stockpiles <br /> Four discreet soil samples were obtained from the two stockpiles of soil generated during tank <br /> removal, three of these samples were obtained from the soils generated during removal of the four <br /> underground fuel tanks and one sample was obtained from the soils stockpile generated during <br /> removal of the waste oil tank <br /> Laboratory test results for soil samples STKi, STK2, and STK3, obtained from the stockpiles of soil <br /> generated during removal of the gasoline and diesel tanks, revealed TPH as gasoline concentrations <br /> ranging from 1 0 mg/kg to 54 mg/kg, TPH as diesel concentrations ranging from 90 mg/kg to 410 <br /> mg/kg, TPH as motor oil concentrations ranging from 82 mg/kg to 130 mg/kg, xylene concentrations <br /> ranging from non-detectable levels to 3 0 mg/kg, and non-detectable concentrations of benzene, <br /> toluene, and ethylbenzene Test results for sample STK4, obtained from the stockpile of soils <br /> generated during removal of the waste oil tank, revealed non-detectable concentrations of TPH as <br /> gasoline and diesel, a TPH as motor oil concentration of 23 mg/kg, and non-detectable concentrations <br /> of BTEX, PCBs, and halogenated solvents <br /> Laboratory test results for all samples are summarized in Table 1, Summary of Analytical Results for <br /> Soil Samples Complete laboratory test results and chain-of-custody documentation are appended <br /> Conclusions ` <br /> f Based on our observations during tank removal and the laboratory analyses, the subsurface soils in <br /> _the_vicinity_of the former underground diesel and gasoline storage tanks have-been contaminated with- — <br /> Ipetroleum hydrocarbons Additionally, the subsurface soils beneath the southern end of the former <br /> waste oil tank, the soils in the vicinity of fuel pipeline trench sample P2, and the soils beneath the <br /> 6 former fuel dispenser island have been contaminated with petroleum hydrocarbons <br /> 000 <br /> WALLACE-KUHL <br /> Recycled gafrsr £r ASSOCIATES INC <br />