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IAM Operable Unit <br /> San Joaquin County - 3 - 19 December 2011 <br /> • L&M Group's opinion that the collected data is sufficient to determine the next steps in <br /> the continuing remediation of soil and groundwater at WOTOA. <br /> • L&M Group's finding that it is feasible to extract and treat groundwater and soil vapor <br /> utilizing the existing DPE system. Modifications to the DPE system will be necessary to <br /> accommodate additional flows and constituents. <br /> • Sufficient data has been collected to merit a decrease in frequency of groundwater <br /> monitoring well sampling. A draft revised MRP will be issued in January 2012. <br /> • L&M Group's finding that gasoline and BTEX have steadily decreased and a rebound <br /> test is warranted. <br /> By 28 February 2012, please submit a groundwater cleanup work plan for the WOTOA <br /> parking lot area. The work plan should also address further study of the Unocal site <br /> groundwater collection trenches so that recommendations can be made regarding the <br /> expansion and modification of the existing treatment system. <br /> Feel free to contact me with any questions or concerns regarding this letter at 916.464.4682 or <br /> rcervantesC)-waterboards.ca..qov. <br /> Roberto Cervantes, PE <br /> Site Cleanup Program <br /> cc: Mr. Eric Hetrick, ConocoPhillips <br /> Mr. Rick Rittenberg, Chevron CEMC <br /> Mr. Robert Goodman, Rogers Joseph O'Donnell <br /> Ms. Katherine Walker, City of Stockton <br />