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MMv <br /> STjdE OF CALIFORNIA-Environmental Protectegency PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION t rAl-Tft -- <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3098 <br /> PHONE: (916) 255-3000 PH 2: 32 <br /> FAX: (915)255-3015 <br /> 5 May 1994 <br /> Mr. Darren Denning <br /> Shell Oil Company <br /> P. O. Box 4848 <br /> Anaheim, CA 92803 <br /> REMEDIAL ACTION, SHELL OIL COMPANY, STOCKTON BULK FUEL TERMINAL, <br /> SAN JOAQUIN COUNTY <br /> On your behalf, Pacific Environmental Group, Inc. (Pacific) submitted the 23 March 1994 Remedial <br /> Action Plan (RAP) for your facility in Stockton. We have reviewed the RAP along with other <br /> related documents. Our comments on these documents are detailed in the enclosed memorandum <br /> and briefly summarized below. <br /> 1. The ground water extraction and treatment system (GWETS) has not operated since April 1993 <br /> and must be restarted. Since the system does not capture the entire dissolved plume, it also <br /> must be expanded. <br /> 2. The vertical extent of ground water contamination and the vertical gradient and flow direction <br /> need to be determined. <br /> 3. Additional wells are needed to define the extent of petroleum hydrocarbon contamination in <br /> secondary source area (SSA) 3 east of Hooper Drive. The ground water in SSA 3 needs to be <br /> tested for chlorinated hydrocarbons which could affect the efficiency of the treatment system. <br /> 4. The Navy's investigation indicates that Site 4 is an unlikely source of the petroleum <br /> hydrocarbon plume west/southwest of Hooper Drive. Shell must submit a work plan to define <br /> the extent of this plume. <br /> By 6 June 1994, please respond to our comments on the RAP and submit a time schedule to restart <br /> the GWETS. Since the information required to obtain the general permit for effluent discharge is <br /> due by 6 May 1994, you should be able to restart the system by 1 June 1994. You should ensure the <br /> 6 May submittal contains all necessary data so there will be no more delays. Also by 6 June 1994, <br /> we request that you submit a work plan with an implementation schedule to define the overall <br /> vertical extent of ground water contamination and the lateral extent of ground water contamination <br /> due to SSA 3's impacts. <br />