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DIK Enterprises Inc. <br /> _5_ '^ June 27, 2011 <br /> Claim No. 12992 <br /> BENZENE Results for MW1GA <br /> wo i <br /> zso --- <br /> 200--- <br /> 150 <br /> oo — <br /> -- -- -� <br /> 100 <br /> N <br /> 1 <br /> -- <br /> ,e Ile <br /> L w._s.. BENZENE �++ Tren� <br /> VII. COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description: active truck fueling plaza <br /> B. Site History: the extent of groundwater contamination is defined <br /> C. Groundwater Monitoring Summary: strong monitoring history <br /> D. Remediation Summary: soil vapor extraction and air sparging <br /> E. Contaminant Exposure Pathway Evaluation: unknown <br /> F. Recommendation: <br /> In April 2008, the Fund concurs with the San Joaquin County LOP that soil vapor <br /> extraction and air sparging be implemented to achieve Water Quality Objectives <br /> in a timely manner. The Fund further recommends that the Responsible Party <br /> evaluate the necessity of each sampling point and to reduce the sampling <br /> frequency as appropriate to reserve available funds for remediation. The Fund <br /> will review this site next year to track progress. <br /> UPDATED, April 2009, this investigation has been underway for 12 years. By <br /> letter on 1 January 2009, the San Joaquin County LOP directed the Responsible <br /> party to reduce monitoring costs. Though there have been recent monitoring <br /> reductions, too many contaminant free wells are being monitored too frequently. <br /> The Fund recommends that the Regional Board direct the Responsible Party to <br /> assess the current monitoring program and to reduce the frequency and number <br /> of wells being monitored to reduce monitoring costs. <br /> UPDATED, June 2010, nearly one million dollars has been spent at this site and <br /> no active remediation has been conducted. Five dozen monitoring locations <br /> have been installed and monitored regularly, creating an enormous amount of <br /> unnecessary data. The consultant for the Responsible Party proposed soil vapor <br /> extraction and air sparging three years ago. The plan has been approved but not <br /> implemented. The Fund recommends that the San Joaquin County require that <br /> California Environmental Protection Agency <br /> Z,*Recycled Paper <br />