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Knowles Family Trust -3- � March 21, 2008 <br /> Claim No. 854 <br /> C. Groundwater Trends: <br /> • Benzene trends are shown below <br /> Claim 854 <br /> 6000 <br /> 5000 <br /> a 4000 <br /> 3000 - -MW-5 <br /> c <br /> m <br /> c2000 <br /> d <br /> m 1000 <br /> 0 <br /> o`5 o°` o°` o`' ob o� <br /> <<e QJ� Few Q Fe' PJB ' ZZ PJB <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: four wells identified within '/z mile of the site <br /> Vlll. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: retail gasoline station <br /> B. Site History: the extent of groundwater contamination is defined <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: excavation only <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: The Fund recommends that the San Joaquin County LOP <br /> should review the Work Plan to replace MW-5, to be destroyed due to roadwork, <br /> and to conduct quarterly groundwater monitoring for a full hydrologic cycle to <br /> assess the need to conduct active remediation. The Fund will review this site <br /> next year to track progress. <br /> Kik 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 /> Z,$Recycled Paper <br />