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U <br /> P <br /> Thiemann Service Station -4- March 24, 2009 r <br /> Claim No. 1978 <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 /> I <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 will be achieved in a few years. <br /> UPDATED, April 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 /> Kirk Larson, P.G. Date Robert Trommer, C.H.G. Date / <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> I <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />