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R <br /> i <br /> Tracy Marine - 3 - October 31, 2011 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case ,, <br /> • Soil Excavation: Unknown <br /> • In-Situ Soil Remediation: No soil remediation has been conducted ' <br /> • Groundwater Remediation: No groundwater remediation has been conducted <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 8 feet bgs and the groundwater <br /> gradient is north at approximately 0.005 feet/foot <br /> • Groundwater Trends: There are more than 11 years of groundwater monitoring'idata for <br /> this Site. MTBE trends are shown below, source area (MW-7) and down gradient <br /> (MW-8) <br /> METHYL-TERT-BUTYL ETHER(MTBE)Results for MW7 •1 <br /> METHYL-TERT-BUTYL ETHER(MTBE)Results Ifor MW8 <br /> � I I <br /> To <br /> -_ II <br /> 6 w _ 1............„ A.__.- <br />- - ^ McTT,YL-T[m.6VM.EiMErt IYTBE7_� T GJ <br /> Risk Evaluation <br /> There are no water supply wells or surface water receptors present within 1,200 feet of the Site. <br /> Recommendation <br /> In May 2008, the Fund made the following recommendation: The Fund recommends that the <br /> San Joaquin County LOP direct the Responsible Party assess the effectiveness of the current <br /> groundwater treatment system and maximize 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, May 2009, the Fund recommends that the San Joaquin County LOP review this site <br /> for closure. <br /> UPDATED, May 2010, 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 />