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Marci's Diesel Service -4 - November 28, 2011 <br /> DIESEL RANGE ORGANICS Results for MW-3 <br /> 400: 42 <br /> i <br /> 350.t _ <br /> 47 <br /> 300.1 ... <br /> _. (. .52 <br /> 200 t 57 .S <br /> 17� IlL17q X150 <br /> -62 <br /> 100 <br /> 501 67 <br /> +.ins 72 <br /> ,, • $ .A� .rtP op' ,,e asp^' <br /> DIESEL RANGE ORGANICS Depth to Weter - Trend <br /> Risk Evaluation <br /> There are no water supply wells or surface water receptors present within 600 feet of the Site. <br /> Drinking water at and near the Site is currently supplied by the California Water Service <br /> Company, Stockton District. <br /> Recommendation <br /> March 2009, the Fund recommends that this site should be considered for closure. <br /> UPDATED, August 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 /> REVISED, December 2010, though there is a significant mass of heavy hydrocarbons in the <br /> vadose zone, the Fund believes residual hydrocarbons do not threaten local water resources <br /> and further active remediation is unlikely to reach Water Quality Objectives more rapidly or cost <br /> effectively. The Fund continues to recommend that the San Joaquin County LOP consider this <br /> site for closure. <br /> UPDATED, December 2011, source area monitoring wells MW-4 and MW-7 have historically <br /> had elevated concentrations of TPHd in groundwater. However, after 11 years of monitoring, <br /> the groundwater plume is largely limited to the source area. Analytical data indicate that WQOs <br /> have been achieved in the down gradient well. Groundwater within the source area will likely <br /> remain above WQOs for years to decades. The affected shallow groundwater is not used as a <br /> source of water supply nor is it likely to be used as a source of water supply in the foreseeable <br /> future. Water users in the vicinity of the site rely on a public water supply. Based on facts in the <br /> record and hydrologic and geologic conditions at the site, the limited residual petroleum <br /> hydrocarbons that remain in soil and groundwater pose a low risk to human health, safety and <br /> the environment. The Fund recommends that the San Joaquin County LOP review this site for <br /> closure. <br /> Kirk Larson, P.G. Date Robert Trommer, 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 />