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Knowles Family Trust -3- February 28, 2011 <br /> Claim No. 854 <br /> C. Groundwater Trends: Benzene trends are shown below, down gradient of <br /> source area. <br /> BENZENE Results for Mw11 <br /> 60000 <br /> 50600- <br /> 40000 <br /> 0000 40000 _____ <br /> a <br /> 30000' — <br /> 20000 — <br /> 10000 -- —....._ ._ <br /> 0 <br /> +�+ BENZENE <br /> VII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: former retail gasoline station, empty field <br /> B. Site History: the extent of groundwater contamination is defined <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: hydrogen peroxide injection proposed <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: <br /> In March 2008, the Fund recommends that the San Joaquin County LOP review <br /> the Work Plan to replace MW-5, to be destroyed due to roadwork, and to conduct <br /> quarterly groundwater monitoring for a full hydrologic cycle to assess the need to <br /> conduct active remediation. The Fund will review this site next year to track <br /> progress. <br /> UPDATED, March 2009, the Fund recommends that the San Joaquin County <br /> LOP direct the Responsible Party to assess remedial technologies and to <br /> implement active remediation to achieve Water Quality Objectives in a timely <br /> manner. The Fund will review this site next year to track progress. <br /> UPDATED, April 2010, the Fund continues to recommend that the San Joaquin <br /> County LOP direct the Responsible Party to assess remedial technologies and to <br /> implement active remediation to achieve Water Quality Objectives in a timely <br /> manner. The Fund will review this site next year to track progress. <br /> California Environmental Protection Agency <br /> Pia Recycled Paper <br />