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' Grant Family Trust -3- May 18, 2009 <br /> Claim No. 8590 <br /> B. In-Situ Soil/ Groundwater Remediation: the San Joaquin County LOP <br /> approved pilot tests for dual phase extraction and air/oxygen sparging. <br /> C. Groundwater Trends: o. <br /> • Benzene trends are shown below <br /> i <br /> BENZENE Results for MW2 <br /> i <br /> 2000 _._.. . - .,.- __.a_.. __ - - __... _. _ 3 <br /> 1800- <br /> 1600 <br /> 800 1600 <br /> 1400 <br /> 1200 -- °? <br /> 1000 _...,.__ ". <br /> 800 -. -- --- = -- - -.:_ 9 <br /> 600 ------ ---- -- ------ - _-- _ ------- <br /> 11 <br /> 400 <br /> 20 - - --- 13 <br /> 0 _��. .....-�..,.., 6 _.. .., :, _W ... .... . . .... ...- I <br /> 41 <br /> . BENZENE Depth to Water <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: 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: pilot tests pending' . <br /> E. Contaminant Exposure Pathway Evaluation: San Joaquin County LOP <br /> directed the Responsible Party in Aug 06 to assess vapor migration risks. <br /> F. Recommendation: <br /> In May 2008, the Fund made the following recommendation: The Fund <br /> recommends that the San Joaquin County LOP direct the Responsible Party to <br /> assess remedial technologies and implement active remediation to achieve <br /> Water Quality Objectives in a timely manner. In addition,.the Fund recommends <br /> that the Responsible Party conduct regular monitoring and upload all data to <br /> Geotracker. The Fund will review this site next year to track progress. <br /> California Environmental Protection Agency <br /> U.a Recycled Paper <br /> i <br />