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s 7 <br /> I <br /> h <br /> USA Petroleum -4- Marc2, 2009. ' <br /> Claim No. 6090 <br /> The source of the UST release has been identified and removed. <br /> k. . Free-phase product in groundwater has been removed to the full extent <br /> practicable, in accordance with the UST Regulations (Title 23, CCR, <br /> Section 2655). <br /> Contaminants remaining in the vadose zone cannot migrate in soil vapor <br /> or leach at concentrations that would cause groundwater to exceed water <br /> quality objectives. <br /> There are no existing water supply wells, surface waters or other <br /> receptors threatened by the remaining contaminants in soil or <br /> groundwater: <br /> • Pollutants remaining in groundwater do not create or threaten to create <br /> risk to human health and safety, -or to future beneficial use(s) of the <br /> groundwater. . . . <br /> • The plume size is stable and sufficiently delineated in lateral and vertical <br /> extent and contaminant concentrations detected in groundwater show a <br /> decreasing trend with time. <br /> In summary, the remaining mass of hydrocarbons in soil and groundwater is minor,'the <br /> extent of contamination is defined, the groundwater plume is shrinking, and Water <br /> Quality Objectives have been achieved. <br /> UPDATED, March '2009: The Fund continues to recommend that the San Joaquin <br /> County LOP consider this site for closure. Further investigation at this site is unlikely to <br /> .benefit the people of California. <br /> -Y, -x <br /> Kirk Larson, P.G. Date. fZobert Trommer, C.H.G. Date <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> 4 <br /> t California Environmental Protection Agency. <br /> Z,c Recycled Paper <br />