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Ms Shelby Lathrop - 2 - 23 April 2009 <br /> Former Tosco Bulk Termin&, �o. 10013 <br /> Groundwater underlying the Site is polluted with dissolved petroleum hydrocarbons. <br /> Constituents of concern (COCs) include total petroleum hydrocarbons as gasoline <br /> (TPHg), TPH as diesel (TPHd), methyl tertiary butyl ether (MTBE), di-isopropyl ether <br /> (DIPE), and tertiary butyl alcohol (TBA). TPHg was non-detect (ND) in all but one well, <br /> MW-3, which contained 77 micrograms per liter (pg/L) of TPHg. The highest <br /> concentrations of TPHd and TBA were 200 pg/L and 220 pg/L, respectively, in MW-2. <br /> MW-17B had the highest concentration:of MTBE at 18 pg/L. These concentrations are <br /> consistent with historical values. <br /> We concur with the Response, so ConocoPhillips may proceed with the work described <br /> in the Work Plan, as modified by the Response. Please provide Central Valley Water <br /> Board staff at least 48 hours notice prior to commencing well installation activities. By <br /> 24 July 2009, please submit a Report of Findings. <br /> If you have any questions regarding this letter, you may contact me at (916) 464-4811 <br /> or betaylor@waterboard .ca.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 />