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Ms. Shelby Lathrop - 2 - 1 June 2009 <br /> Former Tosco Bulk Terminal No. 10013 <br /> concentrations ranged from 55 to 70 micrograms per liter (pg/L), including in <br /> downgradient wells. TPHd concentrations ranged from 50 to 230 pg/L, and TBA <br /> concentrations ranged from 12 pg/L to 260 pg/L. The highest concentration of MTBE <br /> was 18 pg/L. The highest concentrations of COCs were generally present in source <br /> area wells. These concentrations are consistent with historical values. <br /> Based on the delays caused by access negotiations, Central Valley Water Board staff is <br /> willing to extend the due date for the Report of Findings from 24 July 2009 to <br /> 28 August 2009. Please provide at least 48 hours notice prior to commencing well <br /> installation activities. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4811 <br /> or betaylor@waterboarca.gov. <br /> BRIAN TAYLOR P.G. <br /> Engineering/,Geologist <br /> cc: Mr. 'Harlin Knoll, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Richard Stiffler, City of Stockton — Department of Municipal Utilities, Stockton <br /> Ms. Debbie Callie, Port of Stockton, Stockton <br /> Mr. Mark O'Brien, Port of Stockton/ERSC, Alamo <br /> Mr. Jeff Kasper, Deputy Port Director, Environmental Planning & Facilities, Stockton <br /> Mr. Sean Coyle, Stantec, Rancho Cordova <br /> Mr, Joe Aldridge, NuStar Energy, Texas <br /> Ms. Carol Campagna, Shell OPUS, Carson <br />