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CaliforniaWgional Water Quality Con*l Board <br /> Central Valley Region a- <br /> Robert Schneider, Chair <br /> Linda S. Adams Arnold <br /> f,),. Sacramento Main Office Schwarzenegger <br /> 11020 Sun Center Drive 4200.Rancho Cordova,California 95670-6114 Governor <br /> P,wrap„ Phone(916)464-3291 •FAX(916)464-4645 <br /> hup://www.waterboards.ca.gov/centralvalley <br /> RC������/ED <br /> 8 September 2006 SFp i 44006 <br /> ENVIRONkIENT HEALTH <br /> Mr. Jeff Baker PERMIT/SERVICES <br /> Tesoro Companies, Inc. <br /> 3450 South 344th Way, Suite 100 <br /> Auburn, WA 98001-5931 <br /> REVIEW OF GROUNDWATER MONITORING REPORTS, STOCKTON TERMINALS <br /> TECHNICAL COMMITTEE FACILITIES, PORT OF STOCKTON, STOCKTON, SAN <br /> JOAQUIN COUNTY <br /> Staff of the Regional Water Quality Control Board - Central Valley Region (Regional Water <br /> Board) has reviewed three groundwater monitoring reports submitted by SECOR International, <br /> Incorporated (SECOR) on behalf of the Stockton Terminals Technical Committee (STTC). <br /> STTC represents three bulk fuel facilities in Stockton composed of ARCO Products Company, <br /> Tesoro Petroleum Company, and Time Oil Company (site). The following reports were <br /> reviewed: <br /> 1 February 2006 Fourth Quarter 2005 and Annual 2005 Site Status, <br /> Groundwater Monitoring, and Remedial Summary Report(Annual Report) <br /> • 1 May 2006 First Quarter 2006 Groundwater Monitoring and Remedial Summary <br /> Report (First QMR) <br /> 1 August 2006 Second Quarter 2006 Groundwater Monitoring and Remedial <br /> Summary Report (Second QMR) <br /> The Annual Report describes groundwater monitoring and remediation activities for the fourth <br /> quarter 2005 and incorporates data from the first three quarters of 2005. The First and <br /> Second QMRs describe groundwater monitoring and remediation activities for the first and <br /> second quarter 2006, respectively. The reports also discuss operation and maintenance of <br /> the groundwater ozone injection systems near the eastern and southern sides of the site. <br /> Groundwater petroleum hydrocarbon concentrations remain relatively high throughout much of <br /> the site. Separate phase hydrocarbons are intermittently present in several wells though <br /> typically as a sheen or thin layer. The ozone injection systems are operated in two <br /> groundwater zones, denoted Zone A and Zone B, to reduce contaminant concentrations as <br /> groundwater migrates offsite to the east and southeast. <br /> There are three different types of compliance monitoring wells used to evaluate the <br /> effectiveness of the remediation systems. Designated monitoring wells closest to the injection <br /> wells are known as remediation observation wells and wells outside of the known area of <br /> California Environmental Protection Agency <br /> pia Recycled Paper <br />