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Thiemann Service Station U <br /> - 3 - `,. ' October 23;r2011 <br /> General Site Conditions <br /> • Geology and Hydrogeology The Site is underlainby interbedded and intermixed sand, <br /> silt aril clay. The depth to groundwater at approximately 27 feet bgsand the <br /> groundwater gradient is east northeast at from 0.0007 to 0.02 feet perfoot <br /> • ' Estimate of Hydrocarbon Mass in Soil: Prior to remediation, ATC Associates;estimated <br /> that approximately.1244 pounds of TPI-Ig was calculated to remain in site soil. . <br /> • r Groundwater Trends: There are more than 18 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (MW-2) and down gradient <br /> (MW-3) <br /> - `� r BENZENE Results for MW2 - <br /> I i { <br /> Z I r I <br /> vl <br /> BENZENE TenC <br /> L <br /> 1 . <br /> BENZENE Results for MW3 _ 7 <br /> 'S."201 I V1 <br /> T- _ J <br /> j 21 <br /> + Q. <br /> BENZENE T nC - <br /> Risk Evaluation <br /> There are no water supply wells or surface water receptors present within 900 feet of the Site. <br /> 1 <br /> Recommendation <br /> April 2008, the Fund recommends that the site be considered for closure. <br /> UPDATED. April 2009, the Fund continues to.recommend that the San Joaquin County LOP <br /> consider this site for closure. Further investigation at this site is unlikely to benefit the people of <br /> California. <br /> UPDATED, April 2010, this investigation has been underway for 18 years. The Fund continues <br /> to recommend that the San Joaquin County LOP consider this site for closure. Further <br /> investigation at this site is unlikely to benefit the people of California. <br />