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b <br /> M Stallworth Auto Detail October 2013 <br /> 602 California Street W, Stockton <br /> y Claim No : 12235 <br /> Impediments to Closure under the Policy <br /> • General Criteria: The case meets all eight Policy general criteria . <br /> • Groundwater Risk from Residual Petroleum Hydrocarbons: The case does not meet the Policy <br /> groundwater specific criteria because the extent of contamination is not defined . <br /> • Indoor Vapor Risk from Residual Petroleum Hydrocarbons: The case does not meet Policy <br /> criteria because the maximum benzene concentration in groundwater is greater than <br /> 1 , 000 pg/L and the minimum depth to groundwater is less than 30 feet. <br /> • Direct Contact Risk from Residual Petroleum Hydrocarbons: The case meets Policy Criterion <br /> 3b . Although no document titled 'Risk Assessment' was found in the files reviewed , a <br /> professional assessment of site-specific risk from potential exposure to residual soil <br /> contamination found that maximum concentrations of petroleum constituents remaining in soil <br /> will have no significant risk of adversely affecting human health . Excavation was conducted to <br /> 10 feet. The Site is paved and accidental exposure to site soils is prevented . <br /> Recommendation <br /> The Fund concurs with the County that active remediation should continue. In addition , the extent <br /> of contamination should be defined downgradient of the Site . <br /> Ramesh Sundareswaran Date Robert Trommer, C. H. G. Date <br /> Water Resource Control Engineer Senior Engineering Geologist <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341 -5670 (916) 341 -5684 <br /> Page 2 of 12 <br />