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Chapin Brothers Inc. -4- February 25, 2010 <br /> Claim No. 557 <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: soil vapor extraction, air sparging, and groundwater <br /> extraction <br /> E. Contaminant Exposure Pathway Evaluation: unknown, should be assessed <br /> without delay. <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 /> reassess the efficacy of the current treatment systems and to implement <br /> additional treatment technologies as necessary to achieve Water Quality <br /> Objectives in a timely manner. The Fund will review this site next year to track <br /> progress. <br /> UPDATED, March 2009: The Responsible Party conducted a dual phase <br /> extraction pilot test in May 2008. The vapor results collected in May 08 <br /> contained no fuel hydrocarbons. The Fund recommends that the San Joaquin <br /> County LOP direct the Responsible Party to assess an alternate remedial <br /> technology to achieve Water Quality Objectives. The Fund will review this site <br /> next year to track progress. <br /> UPDATED, March 2010: This site has been under investigation for 19 years. <br /> The groundwater extraction system has been restarted. The Fund recommends <br /> that the San Joaquin County LOP direct the Responsible Party to assess <br /> alternate technologies that may achieve Water Quality Objectives more rapidly. <br /> The Fund will review this site next year to track progress. <br /> Kirk Larson, P.G. Date Robert Trommer, C.H.G. Date <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> California Environmental Protection Agency <br /> P. Recycled Paper <br />