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i' <br /> Moore Petroleum -5- March 9, 2009 <br /> Claim No. 889 <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 <br /> minor, the extent of contamination is defined, the groundwater plume is shrinking, <br /> and Water Quality Objectives will be achieved in a few years. <br /> UPDATED, March 2009: The Fund continues to recommend that the <br /> San Joaquin County LOP consider this site for closure. Further investigation at <br /> this site is unlikely 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 <br /> (916) 34.1-5663 (9.16) 341-5684 <br /> California Environmenta/Protection Agency <br /> P.�}Recycled Paper <br />