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C. Navarra Property - 5 - *Woe April 2012 <br /> Recommendation <br /> In March 2008, the San Joaquin LOP has directed the Responsible Party to conduct additional <br /> remedial action north of the site to reduce hydrocarbon mass, which may include free phase <br /> hydrocarbons. The Fund concurs that additional remedial action is necessary and that the <br /> Responsible Party should proceed without delay. The Fund will review this site next year to <br /> track progress. <br /> UPDATED, March 2009, the Fund recommends that the San Joaquin County LOP direct the <br /> Responsible Party to conduct a health hazard assessment. The Fund will review this site next <br /> year to track progress. <br /> UPDATED, April 2010, high concentrations of fuel hydrocarbons remain in shallow groundwater. <br /> The Fund recommends that the San Joaquin County LOP direct the Responsible Party assess <br /> remedial options and conduct active remediation to achieve Water Quality Objectives more <br /> rapidly. The Fund will review this site next year to track progress. <br /> UPDATED, May 2011, monitoring well MW-3, screened in the source area, has consistently had <br /> elevated concentrations of residual hydrocarbons in groundwater. However, after 11 years of <br /> monitoring, the groundwater plume is largely limited to the source area. Groundwater within the <br /> source area will likely remain above WQOs for decades. The Fund recommends that the San <br /> Joaquin County LOP review this site for closure. <br /> UPDATED, April 2012, source area monitoring well MW-3 and down gradient well MW-12 have <br /> historically had elevated concentrations of residual hydrocarbons in groundwater. However, <br /> after 11 years of monitoring, the groundwater plume is shrinking in size and concentration. <br /> Analytical data indicate that WQOs have been achieved in down gradient wells. Groundwater <br /> within the source area will likely remain above WQOs for years to decades. The affected <br /> shallow groundwater is not used as a source of water supply nor is it likely to be used as a <br /> source of water supply in the foreseeable future. Based on facts in the record and hydrologic <br /> and geologic conditions at the site, the limited residual petroleum hydrocarbons that remain in <br /> soil and groundwater pose little risk to human health, safety and the environment. The Fund <br /> recommends that the San Joaquin County LOP review this site for closure. <br /> Kirlk Larson, P.G. Date kobert 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 />