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r GRANITE CONSTRUCTION FACILITY WKA No 2088 01 May 12, 1991 ' Page 2 The samples were analyzed for Total Petroleum Hydrocarbons (TPH) using Modified EPA method 8015, Benzene, Toluene, Ethylbenzene, and Xylene (BTEX) using EPA method 8020 Soil samples ' obtained from beneath the waste oil tank and stockpile of soils generated during waste oil tank removal were additionally analyzed for Polychlorinated Biphenyls (PCBs) using EPA method 8080/Extraction, Halogenated Solvents using EPA method 8010, and "Waste Oil Metals" (Cadmium, �+ Chromium, Lead, Zinc, and Nickel) using EPA method 7000 series Samples were handled and transported in accordance with current state and county guidelines 20,000-Gallon Diesel Tank ' The 20,000-gallon diesel tank was of steel construction and appeared to be in good condition No visible cracks or holes were observed in the tank and only minor patches of rust were noted along the bottom of the tank The sods around the tank, however, contained noticeable petroleum staining and odors One soil sample was obtained from beneath the middle and each end of the 20,000-gallon tank , Sample locations and depths are shown on Plate 1 Laboratory test results revealed non-detectable concentrations of TPH as diesel and motor oil, benzene concentrations up to 1 6 mg/kg, toluene concentrations up to 7 0 mg/kg, ethylbenzene concentrations as high as 9 4 mg/kg, and xylene concentrations up to 75 mg/kg Additionally, sample TIB, obtained from beneath the middle of the tank, contained a TPH as gasoline concentration of 490 mg/kg r 12,000-Gallon Diesel Tank The 12,000-gallon diesel tank was of steel construction and appeared to be in good condition No visible cracks or holes were observed in the tank and only minor patches of rust were noted along the bottom of the tank The soils around the tank, however, contained noticeable petroleum staining and odors One soil sample was obtained from beneath the middle and each end of the 20,000-gallon tank Sample locations and depths are shown on Plate 1 ILaboratory test results revealed non-detectable concentrations of TPH as motor oil, TPH as diesel concentrations up to 10 mg/kg, benzene concentrations as high as 5 8 mg/kg, toluene concentrations up to 36 mg/kg, ethylbenzene concentrations as high as 24 mg/kg, and xylene concentrations up to 130 mg/kg Additionally, sample T2A, obtained from beneath the eastern end of the tank, contained 6 a TPH as gasoline concentration of 470 mg/kg I `�W UVALLACt KUHL Hecy aper ErASSOCIATES INC