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Mohammed Matar 3 - August 15 , 2011 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case . <br /> • Soil Excavation : An estimated 175 cubic yards of impacted soil were removed and <br /> disposed offsite in 2000 <br /> • In-Situ Soil/ Groundwater Remediation : Dual phase extraction , pending <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 varies seasonally between 22 to 24 feet bgs and <br /> the groundwater gradient is south to east at from 0 . 002 to 0. 008 feet/foot in January <br /> 2011 . <br /> • Groundwater Trends : There are more than 7 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (MW-3) and down gradient <br /> (MW-5) <br /> BENZENE Results for MW3 <br /> 50000 <br /> Moog <br /> 20000 <br /> 160011 <br /> 10000 <br /> woo <br /> r � Ze <br /> BENZENE Trand <br /> BENZENE Results for MW5 <br /> 1200 <br /> t00o <br /> ago <br /> 200 <br /> leer 40� <br /> BENZENE rond <br /> Risk Evaluation <br /> No human health risk assessment is noted in Geotracker. There are no water supply I wells or <br /> surface water receptors present within 2 , 000 feet of the Site . <br /> Recommendation <br /> In May 2008, the Fund made the following recommendation , that the San Joaquin Valley LOP <br /> should direct the Responsible Party to implement soil vapor extraction and assess the efficacy <br /> of air sparging to achieve Water Quality Objectives more rapidly. The Fund will review this site <br /> next year to track progress . <br /> UPDATED , May 2009 , the San Joaquin County LOP has directed the Responsible Party to <br /> submit a dual phase extraction pilot test be submitted by 20 March 2009, The Fund concurs <br /> with this action and will review this site next year to track progress. <br /> UPDATED , July 2010 , the Fund concurs with the San Joaquin County LOP, that following <br /> necessary Public Participation , the Responsible Party should begin active remediation to <br />