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L11 <br /> LEEDSWLL•MEAKENMOFF. IMC. <br /> • 2.2 PREVIOUS INVESTIGATION <br /> In September of 1989, ERM west of Sacramento, California conducted a Phase I <br /> Environmental Site Assessment of the property. This site assessment concluded <br /> that soil testing within the former UST excavation and a tank test of the <br /> existing waste oil UST be conducted. <br /> As previously mentioned, Kleinfelder Inc. conducted a soil -gas survey in the <br /> vicinity of the former UST excavation in May of 1990 and performed a precision <br /> tank test of the existing waste oil UST at the C.M. Weber property in June of <br /> 1990. <br /> The soil -gas sampling survey was conducted by extracting and analyzing fifteen <br /> soil-gas samples in and adjacent to the former UST excavation. These samples <br /> were analyzed for total purgeable petroleum hydrocarbons (TRH) , and benzene, <br /> toluene, xylene, and ethylbenzene (BTX&E) by gas chromatography. Concentration <br /> levels of TPH up to 28 000 ug/1 of air were found in the former excava 'on <br /> indicating the presence of gasp ine vapors in the soil . One soil -gas sample <br /> obtained near the i e tren o side the former excavation contained a TPH j <br /> con tion leve indicatin ossible leaks a rom a asoline <br /> supply pipes or from �theumps. A copy of the ern a er Inc. reportan e <br /> soi -gaMnal—y i a� T�s with an interpretive contour map of the TPH <br /> concentrations is included in Appendix A. <br /> The waste oil UST failed a tank precision test on June 1 , 1990, an indication <br /> that the tank may have been leaking at that time. No other records of precision <br /> tank tests on the waste oil UST were found to indicate how long the tank may have <br /> been leaking. No soil samples were taken at that time to verify if the tank was <br /> indeed leaking and had impacted the soils beneath the site. On June 5, 1990, the <br /> contents of the waste oil UST were pumped from the UST and properly disposed of <br /> off-site. <br /> J <br /> 6 <br />