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Chase Chevrolet -3- February 3, 2011 <br /> Claim No. 8294 <br /> Remediation Summary <br /> • Free Product: MW-3, up to 1.92 feet, none since 1996 <br /> • Soil Excavation: Approximately 715 cubic yards of contaminated soil was excavated, <br /> 40,000 gallons of groundwater were extracted and 500 pounds of ORC were backfilled <br /> into the excavation in 2004. <br /> • In-Situ Soil Remediation: Soil vapor extraction was conducted Nov 99 through Feb 01. <br /> • Groundwater Remediation: Air sparging was conducted Nov 99 through Feb 01. Ozone <br /> Sparging, conducted Jun 03 through present. <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, <br /> silt and clay. The closest surface water is McLeod Lake, located approximately <br /> 1,000 feet south of the Site. <br /> • Groundwater Trends: There is no groundwater monitoring data for this Site since 2004. <br /> The Benzene trend down gradient of the source area is shown below. <br /> BENZENE Results for MW3 <br /> 9000 <br /> 8000 <br /> 7000 <br /> �6000 <br /> j5000 ___— _ -i_ <br /> -.4000 <br /> 3000 <br /> 2000 L <br /> 10'0 <br /> r t-----j, <br /> a.--m BENZENE <br /> Risk Evaluation <br /> The threat to human health or the environment is not known but likely minimal since the site is a <br /> paved parking area. There are no water supply wells or surface water receptors present within <br /> 2,000 feet of the Site. <br /> Recommendation <br /> January 2011, by letter in 31 August 2008, the San Joaquin County LOP directed the <br /> Responsible Party to reinstall monitoring wells destroyed during a redevelopment project, report <br /> due by 3 October 2008. The Fund recommends that the San Joaquin County LOP conduct <br /> enforcement action, as necessary, to require that the Responsible Party to assess current water <br /> quality at this Site. p <br /> Kir—L son, P.G. Date RobertTrommer, C.H.G. Date <br /> Engineering Geologist Senior Engineering Geologist <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> California Environmental Protecdon Agency <br /> Z4' Recyc/ed Paper <br />