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METHYL-TERT-BUTYL ETHER (MTBE) Results for MW7A <br />350000 <br />300000 <br />250000 <br />200000 <br />150000 <br />100000 <br />0 <br />e<fp o- - <br />9 9 40 <br />r— <br />L METHYL-TERT-BUTYL ETHER (MTBE) --- Trend 1 <br />Waterloo Food and Fuel -4- May 18, 2009 <br />Claim No. 14120 <br />D. Groundwater Trends: <br />MTBE trends are shown below <br />SENSITIVE RECEPTOR SURVEY: four wells identified within 1/2 mile of the site <br />COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br />Site Description: retail gasoline station <br />Site History: the extent of groundwater contamination is undefined to the west <br />Groundwater Monitoring Summary: moderate monitoring history <br />Remediation Summary: soil vapor and groundwater extraction, discontinued <br />Contaminant Exposure Pathway Evaluation: unknown <br />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 the effectiveness of the current treatment systems and consider adding <br />additional groundwater treatment technologies to achieve Water Quality <br />Objectives more rapidly. In addition, the Fund recommends the Responsible <br />Party define the extent of groundwater contamination west of the site. The Fund <br />will review this site next year to track progress. <br />California Environmental Protection Agency' <br />%,,c,f Recycled Paper