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Valley Motors =37; April 25, 2008 <br /> Claim No. 12540 <br /> C. Groundwater Remediation: <br /> • METHOD 1: air sparging pilot test, ineffective <br /> • METHOD 2: groundwater extraction pilot test, pending <br /> D. Groundwater Trends: <br /> • Benzene trends are shown below: <br /> Claim 12540 <br /> r <br /> 12000 - <br /> 10000 - <br /> 8000 <br /> 2000100008000 <br /> —�--VM-2 <br /> 6000 <br /> VN4-4 <br /> 4000 <br /> m 2000 <br /> 0 <br /> 00 0o O� O� Ori 0o Orb Orb O\ 01 <br /> QQ� off'` <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: no wells identified within 'h 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 defined <br /> C. Groundwater Monitoring Summary:. strong monitoring history <br /> D. Remediation Summary: soil vapor extraction, groundwater,extraction pilot test <br /> is pending <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: San Joaquin County LOP approved a remediation test work <br /> plan in April 2008. The Fund concurs with this action.and will review this site <br /> 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.a Recycled Paper <br />