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r' <br /> California4egional Water Quality Cool Board ., <br /> ° Central Valley Region <br /> Linda S.Adams Arnold <br /> LinKarl E. Longley,ScD,P.E.,Chair Schwarzenegger <br /> SS.Ada <br /> Governor <br /> Environmental <br /> Sacramento Main Office <br /> Protection 11020 Sun Center Drive#200,Rancho Cordova,California 956706114 <br /> Phone www waterb 91 •FAX(v/c 464-4645 <br /> OED <br /> http�.//www.ware rboards.ca.gov/c <br /> MAR 2 t 2008 <br /> 19 March 2008 ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> DESJC-PSS / Maurice Benson <br /> Defense Logistics Agency, DESJC Environmental, Ext. 4065 <br /> Building 16B Mezzanine Floor <br /> 25600 South Chrisman Road <br /> Tracy, CA 95376-50000 <br /> DRAFT WELL MONITORING PROGRAM 2007 ANNUAL MONITORING REPORT, <br /> DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN— TRACY, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff has reviewed the December 2007 Draft Well Monitoring Program 2007 Annual <br /> Monitoring Report: (Draft Report). URS Group Inc. (URS) prepared the Draft Report on <br /> behalf of Defense Logistics Agency Enterprise Support San Joaquin, California (DESJC) for <br /> the Defense Distribution Depot Tracy Site (Site), located in Tracy, California. <br /> Section 7 and Appendix B of the Site Federal Facility Agreement (FFA), effective <br /> 27 June 1991, requires DESJC to prepare and submit Primary Documents including annual <br /> "Well Monitoring Program Reports" to the U.S. Environmental Protection Agency (USEPA), <br /> California Department of Toxic Substances Control (DTSC), and the Regional Water Board. <br /> Section 7 empowers DESJC, USEPA, DTSC, or the Regional Water Board to propose <br /> changes to draft Primary Documents, the draft final of which is subject to Dispute Resolution <br /> in accordance with Section 12 of the FFA. <br /> Pursuant to Appendix B of the FFA, DESJC has proposed substantial changes to the Well <br /> Monitoring Program in the Draft Report, including the monitoring well sampling frequency <br /> Decision Logic. The proposed changes are significant and would result in a 43 percent <br /> reduction in the number of groundwater monitoring wells tested at least once each year for <br /> volatile organic compounds and a 60 percent reduction in wells tested for organochlorine <br /> pesticides. Regional Water Board staff comments are provided below. <br /> MONITORING AND SAMPLING COMMENTS <br /> 1. The Draft Report presents revisions to the Decision Logic for monitoring well <br /> sampling at the Site. The previous Decision Logic was described by a single <br /> groundwater monitoring well sampling flowchart; the proposed Decision Logic is <br /> described by two charts: 1) a VOC chart and 2) a dieldrin chart. The only <br /> significant difference between the two charts is the nomenclature used for <br /> California Environmental Protection Agency <br /> 2d Recycled Paper <br />