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West Clay Properties -4- May 28, 2008 <br /> Claim No. 8542 <br /> D. Groundwater Trends: <br /> • MTBE trends are shown below <br /> Claim 8542 <br /> 9000 -- <br /> 8000 — <br /> c <br /> 7000 ---- <br /> 6000 <br /> 000 --6000 - MW-1 <br /> 5000 — -�MW-2 <br /> 4000 <br /> c 3000 — EW-1 <br /> In 2000 — <br /> 1000 <br /> Oma' O� d�` (Z Q� O� OHO O3 Q� O) <br /> 1.10 <br /> Time <br /> VII. SENSITIVE RECEPTOR SURVEY: no wells identified within '/2 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: ozone sparging <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: The Fund concurs with the San Joaquin County LOP that <br /> the existing ozone sparging system should be expanded to achieve Water <br /> Quality Objectives more rapidly. 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 Environmenta/Protection Agency <br /> m <br /> �.d <br /> Recycled Paper <br />