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Stephen L. Valentine -4- March,14, 2008 <br /> Claim No. 417 <br /> C. Groundwater Trends: <br /> • Benzene trends are shown below <br /> Claim 417 <br /> Shallow Groundwater <br /> 2500 <br /> 2000 <br /> 1500 -+--MW-5 <br /> E 4) 1000 <br /> N <br /> m 500 <br /> m <br /> 0 <br /> M M. M0 V V. . �. .Lo CO CO 0 r- ti <br /> O O O O ,0 O O , O� O O O <br /> 5 O f0 <br /> Time <br /> Claim 417 <br /> Intermediate Groundwater <br /> I _ , <br /> 20000 <br /> 3 15000 <br /> c 10000 -t-MW-2 <br /> I N -�MW-3 <br /> 5000 <br /> M <br /> i <br /> 0 <br /> �(�K�O�`JOD`.�O� J4� �4cO��� <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: four wells identified within Y2 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: dual phase extraction . <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> vir <br /> California En onmental Protection Agency <br /> Zs. �' . <br /> s Recycled Paper <br />