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Chevron Products -4- March 3, 2011 <br /> Claim No. 5820 <br /> D. Remediation Summary: none identified <br /> E. Contaminant Exposure Pathway Evaluation: residual hydrocarbons exceed <br /> ESLs though no complete exposure pathways were identified. <br /> F. Recommendation: <br /> In April 2008, the Fund recommends that the San Joaquin County LOP direct the <br /> Responsible Party to assess remedial technologies and the potential for <br /> hydrocarbon vapor to enter nearby buildings. The Fund will review this site next <br /> year to track progress at the site. <br /> UPDATED, April 2009, this investigation has been underway for 19 years costing <br /> $764,857 and yet no active remediation has been conducted or proposed. The <br /> Fund recommends the San Joaquin County LOP direct the Responsible Party to <br /> assess remedial technologies and implement active remediation to achieve <br /> Water Quality Objectives in a timely manner. The Fund will review this site next <br /> year. <br /> UPDATED, April 2010, this site has been under investigation for 20 years and yet <br /> no active remediation has been conducted. The Fund continues to recommend <br /> that the San Joaquin County LOP direct the Responsible Party to assess <br /> remedial technologies and implement active remediation to achieve Water <br /> Quality Objectives in a timely manner. The Fund will review this site next year. <br /> UPDATED, March 2011, monitoring wells'(MW-15 and MW-15D) screened in the <br /> source area has consistently had elevated concentrations of residual <br /> hydrocarbons in groundwater. However, after 19 years of monitoring, the <br /> groundwater plume is largely limited to the source area. Analytical data indicate <br /> that WQOs have been achieved in down gradient of the source area. <br /> Groundwater within the source area will likely remain above WQOs for decades <br /> to hundreds of years. The Fund recommends that the San Joaquin County LOP <br /> review this site for closure. <br /> Kirk arson, 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 /> California En vironmental Protection Agency <br /> Q0 Recyc%d Paper <br />