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L <br /> Report of Investigation <br /> Former Underground Storage Tanks <br /> 3105 South El Dorado Street,Stockton,California <br /> Sierra-Pacific Project No.96-620.01 <br /> in soil above a concentration of 7 parts per billion. Non-regulated compounds, including TPH-g and <br /> LTPH-o are also present. The natural processes of dispersion, volatilization, oxidation, and <br /> biodegradation will serve to cause natural attenuation of the concentrations of TPH and the low <br /> Lconcentrations of volatile compounds through time. We therefore do not recommend any further action <br /> Lwith respect to soil impacts at the site. <br /> Concentrations of hydrocarbons in ground water are also generally low, with the exception of the <br /> Lbenzene result from B-3 (273 ppb), and MTBE in all three samples analyzed. We recommend <br /> investigation of potential receptors (i.e. utilized ground water wells in the vicinity of the site)prior to <br /> L undertaking an further field exploration. If no receptors are found to be present within a few hundred <br /> Y <br /> yards of the former UST locations,we recommend no further action with respect to ground water at this <br /> site. <br /> L <br /> L <br /> L <br /> L <br /> L <br /> L <br /> Lir <br /> L-ftw, <br /> LSierra-Pacific Groundwater Consultants, Inc. 13 <br />