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California Regional Water Quality Control Board :. <br /> Central Valley Region ; <br /> Winston H.Hickox Robert Schneider,Chair <br /> Cray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/rwqcb52003 2 1 2003 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000-FAX(916)255-3015 ENVIRONMEN i HEALTH <br /> 20 October 2003 PERMIT/SERVICES <br /> Mr. Tracy Sizemore <br /> ConocoPhillips <br /> 1500 North Priest, DC-40A <br /> Tempe, AZ 85281 <br /> REVIEW OF WORK PLAN AND WORK PLAN ADDENDUM,FOR IER TOSCO <br /> TERMINAL#10013, STOCKTON, SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board(Regional Board)have <br /> reviewed the 3 October 2003 Work Plan for Additional Well Installation and Sampling(Work <br /> Plan) and the 16 October 2003 Addendum to Work Plan for Additional Well Installation and <br /> Sampling(Work Plan Addendum) submitted by URS Corporation(URS) on behalf of <br /> ConocoPhillips Petroleum Company(CP) for the former Tosco Bulk Terminal No. 100.13 at <br /> 3505 Navy Drive in Stockton. The Work Plan proposes to install a multi-chambered well about <br /> 150 feet downgradient of monitoring well cluster MW-16, MW-17B, and MW-18C. CP will <br /> install the multi-chambered well to monitor groundwater in the four identified water bearing <br /> zones and delineate the lateral and vertical extent of the tertiary butyl alcohol and methyl tertiary <br /> butyl ether pollutant plumes. <br /> From 9 October though 15 October 2003, Regional Board staff corresponded via email with Ms. <br /> Amy Breckenridge of URS and copied to discuss the purpose of installing the multi-chambered <br /> well into the D water bearing zone. Based on the correspondence, we concurred that a grab <br /> groundwater sample from the D water bearing zone closer to the source area is more appropriate. <br /> The Work Plan Addendum was submitted to propose D water bearing zone sampling prior to <br /> installation of the multi-chambered well. The Work Plan Addendum proposes to collect a grab <br /> groundwater sample using cone penetrometer testing equipment from about 100 feet below <br /> ground surface near monitoring well MW-19C, which is the C water bearing zone well with <br /> concentrations of constituents of concern that prompted the need for further vertical delineation. <br /> Based on the results of the grab groundwater sample from the D water bearing zone and verbal <br /> concurrence from Regional Board staff, CP will either propose monitoring wells for the D water <br /> bearing zone, including the multi-chambered well, or propose that the vertical extent of <br /> petroleum pollution is defined and the multi-chambered well will only monitor the A, B, and C <br /> water bearing zones. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swreb.ca.gov/rwgcb5 <br />