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California jional Water Quality Con tl Board f <br /> Central Valley Region <br /> Karl E. Longley,ScD, P.F.,Chair <br /> Linda S.Adams Arnold <br /> Secreran or Sacramento Hain Office <br /> j 2 D �� ,�i i Schwarzenegger <br /> Fn+rrnrorremal <br /> 11020 Sun Center Dri+c _Op-Rancho Cordo+a.Caliti rm a 95674611 Governor <br /> Protecnar Phone(916)464-3291 •FAX(916)464-464> "� u ,/ <br /> Imp!h+++++ ++aterboards.ca.go</ccntralcallcc <br /> JUL � O 2007 <br /> ENVIRU VivIEN l HEALIH <br /> H <br /> PERMIT:/SERVICES <br /> 25 July 2007 <br /> Mr. Thomas Kosel <br /> ConocoPhillips Company <br /> 76 Broadway <br /> Sacramento, CA 95818 <br /> QUARTERLY REPORTS AND OXYGEN INJECTION PILOT TEST WORK PLAN, FORMER <br /> TOSCO BULK TERMINAL #10013, 3505 NAVY DRIVE, STOCKTON, SAN JOAQUIN <br /> COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) reviewed the following: <br /> • 23 January 2007 Fourth Quarter 2006 and Annual Groundwater Monitoring Report Former <br /> Tosco Bulk Terminal No. 10013 (Annual Report) <br /> • 23 April 2007 First Quarter 2007 Groundwater Monitoring Report Former Tosco Bulk <br /> Terminal No. 10013 (First QMR) <br /> • April 2007 Plans and Specifications, Oxygen Injection System Installation, Former Tosco <br /> Bulk Terminal No. 10013 (Specs) <br /> • 20 July 2007 Second Quarter 2007 Groundwater Monitoring Report Former Tosco Bulk <br /> Terminal No. 10013 (Second QMR) <br /> Earth Tech, Inc. (Earth Tech) submitted the documents on behalf of the ConocoPhillips <br /> Company (ConocoPhillips) for the former Tosco bulk fuel terminal site at 3505 Navy Drive in <br /> Stockton, San Joaquin County (Site). ConocoPhilips conducts groundwater monitoring at the <br /> Site pursuant to Monitoring and Reporting Program (MRP) No. R5-2004-0824. <br /> The Annual Report provides a summary of groundwater monitoring results for 2006 and <br /> compares them to results observed during the fourth quarter. Monitoring for the fourth quarter <br /> was conducted on 11 November 2006. Depth to groundwater (DTW) during the fourth quarter <br /> ranged from about five to about 13 feet below ground surface (bgs). Earthtech calculated that <br /> these elevations were about two feet lower than during first quarter monitoring in February <br /> when groundwater elevations are at their maximum. Earthtech describes the hydrostratigraphy <br /> underlying the Site as consisting of three progressively deeper layers called the A, B, and C <br /> zones. The groundwater gradient and flow direction in the three zones ranged from 0.001 feet <br /> per foot (ft/ft) to 0.003 ft/ft in a southwesterly direction. <br /> California Environmental Protection Agency <br /> 2a Rc ci cled Paper <br />