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California Re nal Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider, Chair H <br /> Terry Tamminen Arnold Schwarzenegger <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.waterbouds.ca.gov/centralvalley <br /> Protection 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 _ <br /> Phone(916)464-3291 Fax(916)464-4797 <br /> 17 December 2004 DEC 2 1 2004 <br /> iJl;� �Ulkl ii_ 1; <br /> Mr. Jeffrey Baker pF f <br /> Tesoro Petroleum Companies,Inc. <br /> 3450 South 344th Way, Suite 100 <br /> Auburn, WA 98001 <br /> REVIEW OF REPORTS, STOCKTON TERMINALS TECHNICAL COMMITTEE, PORT OF <br /> STOCKTON, SAN JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Board)reviewed the <br /> following reports submitted by SECOR International Incorporated on behalf of the Stockton Terminals <br /> Technical Committee (STTC), which is composed of ARCO Products Company, Tesoro Petroleum <br /> Company, and Time Oil Company: <br /> • 25 October 2004 Third Quarter 2004 Site Status, Groundwater Monitoring, and Remedial <br /> Summary Report(Monitoring Report); <br /> 25 October 2004 Work Plan for Additional Assessment(Work Plan); and <br /> • 19 November 2004 Ozone Sparge Well Installation and System Start-Up Report (Ozone Start-Up <br /> Report). <br /> The Monitoring Report discusses the groundwater monitoring activities conducted in August, status of <br /> the ozone sparge systems, proposed implementation of contingency plans for both the A and B water <br /> bearing zones, and the monitored natural attenuation sampling. The Work Plan proposes one <br /> groundwater monitoring well below 90 feet below ground surface to delineate the vertical extent of <br /> petroleum hydrocarbon pollution. STTC will determine if additional monitoring wells are needed to <br /> further delineate the vertical extent or to delineate the lateral extent of pollution in the zone monitored <br /> by the proposed monitoring well. For further definition of the C and D water bearing zones, the Work <br /> Plan proposes the installation of one off-site well pair to monitor these zones. On 8 November 2004, <br /> Regional Board staff received revised Figure 1 and revised Figure 6 for the Work Plan. The Ozone <br /> Start-Up Report discusses the results of the ozone sparge well installation activities, installation of the <br /> two ozone sparge systems, and the ozone system monitoring program. <br /> Regional Board staff has the following comments on the Monitoring Report and the Ozone Start-Up <br /> Report: <br /> 1. The Monitoring Report includes a contingency plan for both the A and B water bearing zones in <br /> the event that"concentrations have increased by one order of magnitude over historical <br /> concentrations for three consecutive quarters after the anticipated spike period." This is <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />