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• Mr. Shelby Lathrop - 3 - 5 June 2008 <br /> Former Tosco Bulk Terminal No. 1 3 <br /> 2. The decreasing arsenic concentrations in the A and B zones may be attributable to <br /> oxidization of the groundwater by the pilot study apparatus. If this trend continues. our <br /> earlier comments expressing concern regarding the potential for metals mobilization may <br /> be unwarranted. At this point, however, the data are still preliminary, and we will continue <br /> to closely monitor the analytical data for this constituent. <br /> In summary, by 25 July 2008, please submit the pilot study report described in Comment No. 1 <br /> above. If you have any questions regarding this letter, you may contact me at (916) 464-4811 <br /> or betaylor@waterboa s ca.gov. <br /> BRIAN TAYLO P.G. <br /> Engineering ologist <br /> cc: Mr. Sean Coyle, SECOR International Incorporated, Rancho Cordova <br /> Mr. Harlin Knoll, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Joe Aldridge, NuStar Energy, Texas <br /> Ms. Debbie Callie, Port of Stockton, Stockton <br /> Mr. Mark O'Brien, Port of Stockton/ERSC, Alamo <br /> Mr. Richard Stiffler, City of Stockton — Department of Municipal Utilities, Stockton <br /> Mr. Jeff Kasper, Deputy Port Director, Environmental Planning & Facilities, Stockton <br /> Ms. Carol Campagna, Shell OPUS, Carson <br />