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i <br /> Arthur Wyatt \.OW -4- April 27, 2009 <br /> Claim No. 1088 ' <br /> D. Groundwater Trends: <br /> • Benzene and MTBE trends are shown below <br /> Results for MW5 <br /> 16001 -21 <br /> 1400 j <br /> 1200 26 <br /> 1000 1 E <br /> 800 { 31 <br /> 600- <br /> 36 0 <br /> 400 - <br /> f <br /> 200 -- <br /> . .. 4 <br /> --.� METHYL-TERT-E3UTYL ETHER(MTBE) wnr. BENZENE + Depth to Water k <br /> VII. SENSITIVE RECEPTOR SURVEY: six wells identified within Y2 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: moderate monitoring history <br /> D. Remediation Summary: soil vapor and groundwater extraction <br /> E. Contaminant Exposure Pathway Evaluation: unknown <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 /> shut down the vapor extraction system and to conduct confirmation sampling to <br /> confirm remediation has adequately removed residual hydrocarbons. In addition, <br /> the Responsible Party should be directed to collect data necessary to prepare a <br /> complete No Further Action Required report. The Fund will review this site next <br /> year to track progress. <br /> UPDATED, May 2009: This site has been under investigation for 18 years. <br /> Based on the following criteria, the Fund recommends this site be considered for <br /> closure providing a health hazard risk assessment is conducted and determined <br /> safe for prescribed site activities, public participation and fee title notifications are <br /> conducted, and the monitoring wells are appropriately abandoned. <br /> • The source of the UST release has been identified and removed. <br /> California EnYironmental Protection Agency <br /> Z4' R cyckd Paper <br />