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BJJ, Inc. - 3 - . August 23, 201:1 <br /> General Site Conditions <br /> + Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, <br /> silt and clay. The depth to groundwater is approximately 7 feet bgs and the groundwater <br /> gradient is northeast at approximately 0.003 feet by foot. <br /> • Groundwater Trends: There are more than 13 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, down gradient of source area (MW-4 and <br /> MW-6) ` <br /> Claim 300,SQUMM AMa(lAW-4 and MW-8) <br /> 1200 : f <br /> IWO s <br /> am <br /> aaa <br /> goo <br /> zoo <br /> A V 0,, <br /> ,gym. <br /> Risk Evaluation <br /> No human health risk assessment is noted in Geotracker. There are no water supply wells or <br /> surface water receptors present within 2,000 feet of the Site. <br /> Recommendation <br /> April, 2008, the Fund recommends that the San Joaquin County LOP direct the Responsible <br /> Party to assess remedial technologies and the potential of hydrocarbons to migrate into nearby <br /> buildings. The Fund will review this site next year to track progress. i <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 (MW-4 and MW-6) screened in the source area <br /> have consistently had elevated concentrations of residual hydrocarbons in groundwater. ' <br /> However, after 13 years of monitoring, the groundwater plume is largely limited to the source <br /> area. Analytical data indicate that WQOs have been achieved in down gradient wells. <br /> Groundwater within the source area will likely remain above WQOs for years to decades. The <br /> Fund recommends that the San Joaquin County LOP review this site for closure. <br /> Ki Larson, P.G. Date Robert Tromme' r, C.H.G. Date <br /> Engineering Geologist Senior Engineering Geologist <br /> Technical Review Unit n h,. + - Chief, Technical Review Unit <br /> (916) 341-5663 -(916) 341-5684 <br />