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Floyd Barnes -3- May 10 , 2010 <br /> Claim No . 11828 <br /> • METHOD 2 : passive oxygen injection <br /> • DURATION : Sep 04 through present <br /> METHOD 3 : oxygen injection (iSOC) <br /> • DURATION : bench scale and pilot study pending <br /> D . Groundwater Trends : <br /> • Benzene trends are shown below: <br /> BENZENE Results for MW-5B - <br /> 4000 - <br /> 3500 - <br /> 3000 - <br /> 2500 - - <br /> CD 35003000 2500 } I <br /> 2000 — <br /> whill <br /> 1500 ... <br /> t <br /> 1000 — <br /> VII . SENSITIVE RECEPTOR SURVEY: no wells identified within 1/2 mile of the site <br /> Vlll. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description : trucking facility, former fueling area <br /> B. Site History: the extent of groundwater contamination is defined <br /> C . Groundwater Monitoring Summary : strong monitoring history <br /> D. Remediation Summary: oxygen injection <br /> E. Contaminant Exposure Pathway Evaluation : not yet assessed <br /> F . Recommendation : <br /> In April 2008 , the Fund made the following recommendation , that the San <br /> Joaquin County LOP should direct the Responsible Party to conduct a limited <br /> investigation to confirm that the extent of groundwater contamination has been <br /> defined east of the site. The Fund also believes the Responsible Party should <br /> assess the effectiveness of the current groundwater treatment system . Benzene <br /> concentrations vary greatlyseasonally suggesting the current sparge interval <br /> may not be optimal . The Fund will review this site next year to track progress . <br /> California Environmenta/ ProtecHon Agency <br /> P.a <br /> RecycledPaper <br />