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RMB Garage -3- May 19 , 2008 <br /> Claim No . 16768 <br /> II <br /> B . In-Situ Soil/ Groundwater Remediation : to date none conducted , dual phase <br /> extraction pilot test was conducted in Mar 06 . Consultant has recommended that <br /> dual phase extraction be conducted . <br /> C . Groundwater Trends : <br /> • Benzene trends are shown below: <br /> Claim - 16766 <br /> 350000 <br /> 300000 <br /> c 250000 — <br /> O t Nlw-1 <br /> 200000 <br /> t Mw-2 <br /> N 150000 WV-3 <br /> m 100000 <br /> 50000 - - <br /> 0 <br /> Oma' Oa Oa Off` O� Oy 05 06 OE' OHO 0% 0% <br /> O°� deb )JO O°� e<Z )J° O°� e<z )00 O°� Few )JO <br /> Time <br /> VII . SENSITIVE RECEPTOR SURVEY: one well identified within '/z mile of the site <br /> VIII . COMMENTS AND JUSTIFICATION FOR RECOMMENDED ACTION <br /> A. Site Description : former service station <br /> B. Site History : the extent of groundwater contamination is undefined north of the <br /> site <br /> C . Groundwater Monitoring Summary: strong monitoring history <br /> D . Remediation Summary: none identified <br /> E. Contaminant Exposure Pathway Evaluation : unknown <br /> F. Recommendation : The Fund recommends that the San Joaquin County LOP <br /> direct the Responsible Party to assess remedial technologies and implement <br /> active remediation to achieve Water Quality Objectives in a timely manner. The <br /> Fund recommends that the Responsible Party, concurrently with remediation , <br /> define the extent of groundwater contamination north of the site . The Fund will <br /> review this site next year to track progress . <br /> Kirk Larson , P . G . Date RobertTrommer, C . H . G . Date <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341 -5663 (916) 341 -5684 <br /> California Environmental Protection Agency <br /> J' Recycled Paper <br />