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Helen Higgins -5- April 30, 2009 <br /> Claim No. 11775 <br /> • Contaminants remaining in the-vad se 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 /> • 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 hydrocarbon in soil and groundwater is minor, the <br /> extent of contamination is defined, the groundwa er plume is shrinking, and Water <br /> Quality Objectives will be achieved in a few years. <br /> UPDATED,-May 2009: This site has been under investigation for 13 years. The Fund <br /> continues to recommend that the San Joaquin County LOP consider this site for <br /> closure. Further investigation at this site is unlikely to benefit the people of California. <br /> Kir Larson, P.G. Date Robert Trommer, C.H.G. Date <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 ( 16) 341-5684 <br /> a <br /> . i <br /> i <br /> ; <br /> California Environment-71-Protection Agency <br /> Co Recycled Pap r <br />