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a <br /> Equilon Enterprises -5- `.•' February 22, 2010 <br /> Claim No. 4954 <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: <br /> In March 2008, the Fund made the following recommendation: The Fund <br /> recommends that the San Joaquin County LOP direct the Responsible Party to <br /> monitor newly installed monitoring wells for a full hydrologic cycle prior to . <br /> assessing the need to conduct active remediation on the deeper zones (50+ <br /> feet). The Fund will review this site next year to track progress. <br /> — -UPDATED, Match 2009 T-he-Fund-recommend s-that-the-San-Joaquin--County- - - — <br /> LOP direct the Responsible Party to assess remedial technologies that can <br /> reduce the mass of fuel hydrocarbons in the deeper zones. The Fund will review <br /> this site next year to track progress. <br /> UPDATED, March 2010: This site has been under investigation for 20 years and <br /> no active remediation has been conducted since 1996. The extent of <br /> contamination has been defined and the plume is shrinking in size and <br /> concentration. Water Quality Objectives are likely to be achieved without further <br /> active remediation. Based on the following criteria, the Fund recommends this <br /> site be considered for closure. <br /> The source of the UST release has been identified and removed. <br /> • Free-phase product in groundwater has been removed to the full extent <br /> practicable, in accordance with the UST Regulations (Title 23, CCR, <br /> Section 2655). <br /> • Contaminants remaining in the vadose zone cannot migrate in soil vapor <br /> or leach at concentrations that would cause groundwater to exceed water <br /> quality objectives. <br /> • There are no existing water supply wells, surface waters or other <br /> receptors threatened by the remaining contaminants in soil or . <br /> groundwater. <br /> • Pollutants remaining in groundwater do not create or threaten to create <br /> risk to human health and safety, or to future beneficial use(s) of the <br /> groundwater. <br /> • The plume size is stable and sufficiently delineated in lateral and vertical <br /> extent and contaminant concentrations detected in groundwater show a <br /> decreasing trend with time. <br /> • There are no current or anticipated uses of the impacted groundwater <br /> within the timeframe projected to meet water quality objectives. <br /> California En vironmental Protection Agency <br /> C,?Recycled Paper <br />