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Giglini, Anthony <br /> From: Schreiner, Dan <br /> Sent: Wednesday, May 05, 2010 3:59 PM <br /> To: Lathrop, Shelby S (Shaw Environmental, Inc.); Rittenberg, Rick O.; Robert C. Goodman; <br /> Benkosky, Rusty; Giglini, Anthony <br /> Subject: FW: Work Plan for L&M, WOTOA,and Unocal <br /> -----Original Message----- <br /> From: Roberto Cervantes [mailto:RCervantes@waterboards.ca.gov] <br /> Sent: Wednesday, May 05, 2010 3:43 PM <br /> To: Schreiner, Dan <br /> Cc: Ava Kenney; Duncan Austin <br /> Subject: Work Plan for L&M, WOTOA, and Unocal <br /> Dan, <br /> Regional Board staff have reviewed the report entitled "Work Plan for Additional separate <br /> Phase Hydrocarbon Assessment, Groundwater Recovery Well Installation, and Remedial System <br /> Feasibility Study" submitted by Stantec on behalf of the L and M Group.. <br /> The Plan proposes to collect additional geological and petroleum hydrocarbon <br /> characterization data in the WOTOA parking lot area using cone penetrometer (CPT) and <br /> laser-induced fluorescence (LIF) technology. <br /> Direct push technology will be used to collect some soil samples to verify the accuracy <br /> of the LIF data. The data will be used to optimize the location of future multi-phase <br /> extraction wells to be installed in the WOTOA parking lot area. <br /> The Plan also proposes to install two dual phase extraction wells in the groundwater <br /> collection trenches constructed by the City of Stockton in the Unocal operable unit. The <br /> wells will be used to test the aquifer for groundwater recovery. The wells will be <br /> continuously operated for approximately 72 hours. Each well will be sampled at the <br /> conclusion of the aquifer test. Samples will be analyzed for the following <br /> constituents: <br /> TPH (gasoline, diesel, and oil) <br /> BTEX, MTBE, and TBA <br /> Total organic carbon <br /> Ammonia and Nitrate <br /> Total Phosphate and Ortho Phosphate <br /> Total and Ferrous Iron <br /> The Plan states that EPA method 8015 with silica gel cleanup will be used to test for <br /> TPH. Please use EPA method 8015 without silica gel cleanup. It has been our experience <br /> that we obtain more accurate results without silica gel cleanup. <br /> The Regional Board concurs with the work plan subject to the discussion above. We look <br /> forward to continuing the cleanup activities at the Stockton Waterfront sites. The data <br /> collected during this effort will help guide the groundwater cleanup phase in the area. <br /> Please contact me with any questions or concerns...thanks <br /> Roberto Cervantes, PE, LEED AP <br /> Central Valley Water Board <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, CA 95670 <br /> 916.464.4682 direct <br /> 1 <br />