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Super Center Mart -3- April 25, 2008 <br /> Claim No. 12741 <br /> A. Soil Excavation: unknown volume <br /> B. In-Situ Soil Remediation: <br /> * METHOD- 8 hour soil vapor extraction pilot test <br /> C. Groundwater Remediation: <br /> • METHOD: 12 hour groundwater pumping test <br /> D. Groundwater Trends: <br /> • Benzene trends are shown below: <br /> Claim 12741 <br /> 120000 - <br /> 100000 - ---- --- <br /> '680000 --- - - -+—MW-1 <br /> MW-2 <br /> d 60000 <br /> W MW-3 <br /> 40000 Mw 9a <br /> m <br /> 20000 - — <br /> 00 00 O� Oa O� OD OHO Oro <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: one well identified within '/2 mile of the site <br /> VIII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: active retail gasoline station <br /> B. Site History: the extent of groundwater contamination is undefined to the <br /> southeast <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: soil vapor extraction and groundwater pumping pilot <br /> test have been preformed <br /> E. Contaminant Exposure Pathway Evaluation: assessment is underway <br /> California Environmental Protection Agency <br /> C3 Receded Paper <br />