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Cox and Cox -4- April 23, 206$ <br /> Claim No. 9444 <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 /> e 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 will be achieved in a few years. f <br /> q 1-z d-lol d&�z' <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 /> Californfa Eavkonmenft!Protecdon Agency <br /> RvydedP*pff <br />