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Mr Michael Walton • • Walton Engineering March 20, 1998 . LABORATORY ANALYSES AND RESULTS All of the soil samples collected from beneath the former underground fuel storage tanks, fuel dispenser islands, and underground product pipelines and from the associated soil stockpile were analyzed by California Laboratory Services, Inc , (CLS) of Rancho Cordova. California for • Total petroleum hydrocarbons in the range of gasoline (TPHg) using Environmental Protection Agency (EPA) Method 8015 (modified) with purge and trap EPA Method 5030 and/or • Total petroleum hydrocarbons in the range of diesel fuel (TPHd) using EPA Method 8015 (modified) with sonication EPA Method 3550 and • Volatile organic compounds benzene, toluene, ethylbenzene, total xylene isomers (BTEX) using EPA Method 8020 with purge and trap EPA Method 5030 In addition to these analyses, the four soil samples collected from beneath former underground storage tanks T1 and T2 and the four soil sample composites collected from the soil stockpiles were analyzed for • Total lead using EPA Method 7421 • All of the soil samples collected from beneath the former underground storage tanks and from beneath the former fuel dispenser islands were analyzed for • Volatile oxygenates di-isopropyl ether, ethyl t-butyl ether, methyl t-butyl ether t-amyl methyl ether, and t-butyl alcohol using EPA Method 8260 Soil samples collected from the area of overexcavation and from beneath the abandoned product pipeline were analyzed for TPHg, TPHd and BTEX compounds using the aforementioned analytical methods CLS is accredited by the State of California to perform all of these analyses Laboratory results of soil samples collected from beneath the former underground storage tanks at the site indicated that elevated concentrations of TPHg, TPHd, and BTEX compounds were detected in the soil sample collected from beneath the northern end of storage tank T1 (Tln on Table 1) Low concentrations of TPHg and/or one or more of the BTEX compounds were detected in soil collected from beneath the northern ends of the two fuel dispenser islands (FD 1 and FD2 on Table 1) Detectable concentrations of TPHg, TPHd and BTEX compounds were not found in soil samples collected from beneath any of the other underground storage tanks, fuel dispenser islands, or any of the underground product delivery pipelines Concentrations of total lead were not detected at or greater than 10 parts per million (ppm) in any of the soil samples analyzed for total lead (Table 1) The laboratory reports for these soil samples are presented in Appendix A • GRAYLAND EAWRON11E.UTAL Grayland 022-160 trr 4