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i <br /> Thiemann Service Station - 3 �"�,, October,23, 2011 <br /> � I <br /> I <br /> General Site Conditions k „ <br /> Geology and Hydrogeology:. Ttre Site is underlain by interbedded and intermixed sand, <br /> silt and clay. The depth to groundwater at approximately 27 feet bgs and the <br /> groundwater gradient is east northeast at from 0.0007 to 0.02 feet per foot <br /> • .Estimate of Hydrocarbon Mass in Soil: Prior to remediation, ATC Associates estimated <br /> that approximately 1244 pounds of TPHg was calculated to remain in site soil.,_ <br /> • 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 /> BENZENE Results for MW2 <br /> 41 <br /> � l <br /> 21 <br /> Ile <br /> • ' ' ` BENZENE - Yrenj <br /> BENZENE Results for MW3 <br /> K <br /> 1 ----- <br /> 2.1 <br /> ,5.1Io <br /> . <br /> BENZENE -T— J <br /> S <br /> Risk Evaluation <br /> There are no water supply wells or surface water receptors present within 900 feet of the Site. <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 /> r <br />