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M <br /> Balbir Grewal U -4 March 17, 2009 <br /> Claim 'No. 13651 <br /> •.F 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 /> t 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 /> s <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 /> • There are no current or anticipated uses of the impacted groundwater <br /> within the timeframe projected to meet water quality objectives. <br /> In summary, the remaining mass of hydrocarbons in soil and groundwater is minor, <br /> the extent of contamination is defined, the groundwater plume is shrinking, and <br /> Water 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 <br /> to 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 f <br /> (916) 341-5663 (916) 341-5684 r <br /> w ! <br /> I <br /> i <br /> i <br /> ,p <br /> I <br /> i <br /> California Environmenta/Protection Agency <br /> Zd Awyded Pope, <br />