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West Clay Properties -4- _ May 2, 2011 <br /> Claim No. 8542 <br /> VII. 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: <br /> In May 2008, the Fund concurs with the San Joaquin County LOP that the <br /> existing ozone sparging system should be expanded to achieve Water Quality <br /> Objectives more rapidly The Fund will review this site next year to track <br /> progress. <br /> UPDATED, May 2009, the Fund recommends that the groundwater treatment <br /> system be modified as necessary to achieve Water Quality Objectives in a timely <br /> manner. The Fund will review this site nest year to track progress. <br /> UPDATED, May 2010, this investigation has been underway for 21 years. By <br /> the15 April 2010 letter, the San Joaquin County LOP extended the deadline for <br /> the remediation work plan. The Fund recommends that future efforts are focused <br /> on active remediation to achieve Water Quality Objectives in a timely manner. <br /> The Fund will review this site next year to track progress. <br /> UPDATED, April 2011 , the Fund concurs with the San Joaquin County LOP that <br /> the Responsible Party should assess vapor migration east on MW-1 . <br /> Kirk Larson, P.G. Date Robert Trommer, C.H.G. Date <br /> Engineering Geologist Senior Engineering Geologist <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> California Environmental Protection Agencf <br /> 0 Reevc%d Paper <br />