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Weldon Church - 3 - August 29, 2011 <br /> Remediation Summary <br /> • Free Product: No free product was documented throughout the life of this case <br /> • Soil Excavation: An 100 cubic yards of impacted soil were removed in 1995 and <br /> disposed offsite in 1996 <br /> • In-Situ Soil Remediation: No soil remediation has been conducted <br /> • Groundwater Remediation: In-situ chemical oxidation, approved by 14 January 2011 <br /> letter by the San Joaquin County LOP <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 approximately 6 feet bgs and the groundwater <br /> gradient is northwest at approximately 0.006 feet/foot (June 2011) <br /> • Groundwater Trends: There are more than 15 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (MW-1) and down gradient <br /> (MW-8) <br /> BENZENE Results for MW1 <br /> 300 <br /> 250 <br /> 200 <br /> 2 <br /> 150 }}}S41 <br /> 100 <br /> 50 <br /> w <br /> Ile <br /> --BENZENE +.+.a TI-0 <br /> BENZENE Results for MW8 <br /> 400 <br /> 350 <br /> 300 <br /> Y, ti <br /> 1200...... <br /> 4� <br /> 150 <br /> 100 <br /> 50 <br /> BENZENE ++«Trend <br /> Risk Evaluation <br /> Crawl space air investigation work plan was prepared in February 2011 because soil vapor <br /> samples exceeded ESLs. There are no water supply wells or surface water receptors present <br /> within 900 feet of the Site. <br /> Recommendation <br /> July 2010, the Fund concurs with the San Joaquin County LOP that a soil vapor survey and <br /> Human Health Risk Assessment should be conducted at this site. <br />