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Ernie's General Store -3- May 19, 2008 <br /> Claim No.17028 <br /> C. Groundwater Trends: <br /> MTBE trends are shown below: <br /> Claim 17028 <br /> 12000 <br /> 10000 <br /> 8000 <br /> —�MVV-3 <br /> LU 6000 <br /> pp t WV-4 <br /> ~ 4000 <br /> 2000 <br /> 0 <br /> O O O O O O O O O O O O O <br /> O O O O O O O O O O O O O <br /> N N N N N N N N N N N N N <br /> V V V V V R <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: 10 wells identified within ''Y2 mile of the site <br /> VIII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: former 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: none identified <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: The San Joaquin County LOP has directed the Responsible <br /> Party to implement active soil vapor extraction to remove contaminant mass. <br /> The Fund concurs that active remediation be conducted at this site. The Fund <br /> recommends that the appropriateness of using air sparging as a means of <br /> achieving Water Quality Objectives more rapidly be evaluated. The Fund will <br /> review this site next year to track progress. <br /> Kik Larson, P.G. Date RobertTrommer, 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.d Recycled Paper <br />