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} .Van De Po(Enterprises 'August 29, 2011 <br /> Risk!Evaluation 1 i� <br /> No human health risk assessment is noted in Geotracker:' There are no water supply,wells or, <br /> surface water receptors present within 600 feet of the Site. ....: _ �- <br /> Recommendation <br /> In Match 2008, the current groundwater treatment system is screened above contamination <br /> identified by wells MW-13A, MW-13B, and MW-13C. The Fund recommends that the San <br /> Joaquin County LOP direct the Responsible Party to assess the efficacy of the current <br /> groundwater treatment system and to modify the system as necessary to achieve Water Quality <br /> Objectives in a timely manner. The Fund will review this site next year to track progress. <br /> UPDATED, March 2009, the SanIJoaquin County LOP has directed the Responsible Party to <br /> conduct rebound testing and soil vapor survey. The Fund concurs and will review this site next <br /> year to track progress. <br /> . <br /> UPDATED, September 2010,the Fund recommends that the San Joaquin County LOP consider <br /> this site for closure. *- <br /> UPDATED, September 2011, monitoring wells (AW-1A and AW-1 B) screened in the source <br /> area have had elevated concentrations of residual hydrocarbons in groundwater. However, <br /> after 15 years of monitoring, the groundwater plume is largely limited to the source area and <br /> volatile constituents have nearly achieved water quality objectives. Analytical data indicate that <br /> WQOs have been achieved in down gradient wells. Groundwater within the source area will <br /> likely remain above WQOs for years to decades. The Fund recommends that the San Joaquin <br /> County.LOP review this site for closure. <br /> Xz-7A <br /> Kirk Larson, P.G. Date Pobert Trommer, C.H.G. Date lr/ <br /> Engineering Geologist Senior Engineering Geologist <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> ., A <br />