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• A <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Terry Tamminen Robert Schneider Chair -_ 0 <br /> Secretary for Sacramento Main Office Arnold Schwaraenegger <br /> Environmental Internet Address: rive/wwwRanc Rancho <br /> ova, vA 95670-611 ® COPY Governor <br /> Protection 11020 Sun Center Drive p200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 Fax(916)4644797 <br /> 17 December 2004 <br /> D Cg3d <br /> Mr. Jeffrey Baker DEC 2 U 2004 2� <br /> Tesoro Petroleum Companies, Inc. <br /> 3450 South 344`s Way, Suite 100 BY'"'"'"""""'•"".- <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 mi <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 /> ea Recycled Paper <br />