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ID <br /> IGEN <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board <br /> 6 July 2012 <br /> Mr. Sam Brenneke <br /> Shell Oil Products US <br /> 20945 South Wilmington Avenue <br /> Carson, CA 90810 <br /> FEASIBILITY STUDY AND CORRECTIVE ACTION PLAN AND TREND ANALYSIS <br /> LETTER, SHELL STOCKTON TERMINAL, 3515 NAW DRIVE, STOCKTON, SAN <br /> JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley <br /> Water Board) staff reviewed the following: <br /> 15 March 2012 Feasibility Study and Corrective Action Plan (FS/CAP) <br /> 4 May 2012 Trend Analysis Letter(Letter) <br /> Conestoga-Rovers and Associates (CRA) submitted the documents on behalf of Shell <br /> Oil Products US (Shell) for the Shell Stockton Terminal at 3515 Navy Drive in Stockton <br /> (Site). The Site has been an operating fuel storage and distribution facility since the <br /> 1940s and is located in an industrial area on Rough and Ready Island in Stockton. <br /> Shell currently receives fuel products via the Shell Pipeline Corporation and stores <br /> gasoline, diesel, and ethanol at the Site. <br /> The FS/CAP summarizes the current Site conditions. The maximum soil concentrations <br /> of total petroleum hydrocarbons as diesel (TPHd), TPH as gasoline (TPHg), and <br /> benzene at the Site are 4,400 milligrams per kilogram (mg/kg), 4,100 mg/kg, and <br /> 2.7 mg/kg, respectively. Petroleum hydrocarbon soil concentrations within current <br /> operations areas in the tank farm and loading rack exceed the California Regional <br /> Water Quality Control Board — San Francisco Bay Region Environmental Screening <br /> Levels (ESLs) for the commercial/industrial scenario. The FS/CAP concluded that <br /> construction workers at the Site are required to obtain specific permits to conduct work <br /> in the loading rack and tank farm; therefore, it is unlikely that they will come into direct <br /> contact with the impacted soil. <br /> Shell installed 38 groundwater monitoring wells at the Site and conducts quarterly <br /> groundwater monitoring. In December 2011, the maximum TPHd, TPHg, benzene, and <br /> methyl tert butyl ether (MTBE) concentrations in groundwater were 17,500 micrograms <br /> per liter (Ng/L); 20,000 pg/L; 9,190 pg/L; and 1,470 pg/L, respectively. Shell concludes <br /> that the groundwater plumes are stable and defined. Between 1987 and 2011, Shell <br /> KARL L. LoigOLC5SCD, P.E.. CHAIR I rAMCLA C. CRCEDON P.E.. DCEE, EXECUTIVE OFFICER <br /> 11070 Sun CAH,Rr DHvA X200.Rancho Gomova.CA 95870 www.walArouarAA.ca gov/cbnvalvalley <br /> to ri,;ru rn,..a n <br />