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Kenneth Endith • -4- • April 21 , 2008 <br /> Claim No. 8479 <br /> D. Groundwater Trends: <br /> Benzene trends are shown below <br /> Claim 8479 <br /> 100000 --- <br /> m <br /> 80000 <br /> m <br /> 60000 BMW-7B <br /> m 40000 _ VW-1C <br /> 20000 --J, <br /> 0 <br /> 0 0 0 0 0 0 0 0 0 0CU - <br /> a a a a a a <br /> 2 <n 2 ca in � <n 2 in 2 ca in <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: 13 wells identified within '/2 mile of the site <br /> VIII. 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: soil vapor and groundwater extraction <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: The Fund recommends that the San Joaquin County LOP <br /> direct the Responsible Party to assess the effectiveness of the current <br /> remediation systems and implement other technologies to achieve Water Quality <br /> Objectives in a timely manner. The Fund will review this site next year to track <br /> 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 /> �.a Recye/edPapec <br />