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Mr Shelby Lathrop - 3 - 8 August 2008 <br /> Former Tosco Bulk Terminal No. 1l 3 <br /> ti <br /> ConocoPhillips conducts groundwater monitoring at the Site pursuant to Monitoring and <br /> Reporting Program (MRP) No. R5-2004-0824. The 29 July 2008 Second Quarter 2008 <br /> Groundwater Monitoring Report describes groundwater activities performed on 21 May 2008, <br /> about one month before the final pilot study readings were collected. The groundwater flow <br /> directions in the A, B, and C zones were to the southwest. The gradients ranged from <br /> 0.0015 feet per foot (ft/ft) in the C zone to 0.004 ft/ft in the A and B zones. <br /> During the second quarter, TPHg was non-detect in all of the five wells sampled for this <br /> constituent. The highest concentration of TPHd was in MW-8 at 140 pg/L. MW-21 B contained <br /> the highest concentration of TBA at 62 pg/L, and the highest concentration of MTBE was in <br /> MW-20 at 13 pg/L. <br /> As stated in our 5 June 2008 letter and verified by the Report, we concur that optimization of <br /> the delivery system and additional injection points are warranted, and accept ConocoPhillips' <br /> proposal to meet to discuss the Report's conclusions and recommendations. We will contact <br /> Stantec shortly after mailing this letter to arrange a meeting. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4811 or <br /> betaylor@waterboards.ca.g�w. <br /> BRIAN TAYLOR P.G. <br /> Engineering Geologist <br /> cc: Mr. Sean Coyle, Stantec, 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 />