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r 26485 THORNTON ROAD WKA No. 2213.09 June 23, 1993 Page 2 The water sample were collected using new polyethylene disposable bailers. Water from the bailers was decanted into appropriate sample containers provided by the laboratory. The samples were immediately placed in an ice-chest with .ice, along with a travel blank, and submitted under chain-of-custody to a California-certified laboratory for.analysis. All samples were analyzed for Total Petroleum Hydrocarbons as gasoline (TPHg) using Modified EPA method 8015, 1,2-Dibromoethane (EDB) using EPA method 8240, Behene, Toluene, Ethylbenzene, and Total Xylenes (BTEX), using EPA method 5020, and Total:Lead using method 7420174211239.2. Observations The two underground storage tanks were of steel construction and appeared to be in good condition. No obvious odor-was noted as the USTs were pulled from the ground.- Petroleum stains were observed in the southeast corner of the tank excavation. At the request of Mr. Trevena, a sample (SW1) was obtained from the westerly sidewall of the excavation at a depth of . approximately four feet. The soils consisted primarily of medium brown, silty clays and sands. Water was initially encountered in the excavation at a depth of approximately 10 feet and stabilized at a depth of approximately 9 feet below grade. A petroleum hydrocarbon sheen was observed on the surface of the water in the excavation at the time of sampling. Findings Analytical results for samples Tia and 72a obtained from beneath the westerly ends of each UST revealed no detectable concentrations of TPH-gasoline or BTEX. Analytical.results for sample Tlb and 72b, obtained from beneath the easterly end of each UST, revealed TPH-gasoline concentrations of 510 mg/kg and 100 mg/kg, respectively. Analytical results for the samples obtained.beneath the former dispensers revealed no detectable concentrations of TPH-gasoline and N V WALLACE-KUHL &ASSOCIATES INC.