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Mpmgmm - Ms _ p py- Wita L9LEEQSHILL•HEAKEHHOFF.ANC. Fk1 ' ry 2.2 PREVIOUS INVESTIGATION ! In September of 1989, ERM west of Sacramento, California conducted a Phase I �. Environmental Site Assessment of the property. This site assessment concluded that soil testing within the former UST excavation and a tank test of the existing waste oil UST be conducted. As previously mentioned, Kleinfelder Inc. conducted a soil-gas survey in the vicinity of the former UST excavation in May of 1990 and performed a precision tank test of the existing waste oil UST at the C.M. Weber property in June of 1990. i The soil-gas sampling survey was conducted by extracting and analyzing fifteen soil-gas samples in and adjacent to the former UST excavation. Theses amples were analyzed for total purgeable petroleum hydrocarbons (TPH), and benzene, toluene, xylene, and ethylbenzene (BTX&E) by gas chromatography. Concentration >.- levels of TU up to 28 000 ug/1 of air were found in the former excavation indicating the presence of gasoline vapors in the soil. fine soil-gas sample obtained near the i e tren —out—side the former excavation contained a TPH con tion�ev' indicat�n ossible leaks a rom a asoiine su p!g, pipes m the pumps. A copy of the eine er Inc. report an e soy -gas ra resu s with an interpretive contour map of the TPN concentrations is included in Appendix A. The waste oil UST failed a tank precision test on ,lune 1, 1990, an indication + ` that the tank may have baen leaking at that time. No other records of precision tank tests or,'the waste oil UST were found to indicate how long the tank may have been leaking. No soil samples were taken at that time to verify if the tank was f �.. indeed leaking and had impacted the soils beneath the site. On June S, 1990, the contents of the waste nil UST were pumped from the UST and properly disposed of off-site. J 6