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0 Californiftegional Water Quality Cool Board <br /> Central Valley Region Arnold <br /> Linda S.Adams Karl E. Longley,SCD, P.E.,Chair Schwaaenegger <br /> Secretary for <br /> Enrironnienial Protection Gooerrmr <br /> 11020 Sun Center Drive N200,Rancho Cordova.California 9i6�jlr9;�� I_ �I„ /,I,�ID <br /> Phone(916)464-3291 •FAX(916)464-4645 �� ( 9 LLQ V L�� <br /> http://www.waterboards ca.eov/centralvalley <br /> MAR 1 7 2009 <br /> ENVIRONTIENT I4EALTH <br /> 13 March 2009 PERMIT/SERVICES <br /> DESJC, M.BENSON <br /> Defense Distribution Depot San Joaquin <br /> P.O. Box 960001 <br /> Stockton, CA 95296 <br /> DRAFT DDJC-TRACY WELL MONITORING PROGRAM 2008 ANNUAL MONITORING <br /> REPORT, DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN— TRACY SITE <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff has reviewed the DDJC-Tracy Well Monitoring Program 2008 Annual Monitoring <br /> Report(Draft Report) dated December 2008 and received by electronic mail on <br /> 22 December 2008 and during a meeting on 14 January 2009. The Draft Report was <br /> prepared by URS Group, Inc., on behalf of Defense Logistics Agency Enterprise Support San <br /> Joaquin, California (DESJC) for the Defense Distribution Depot (DDJC) Tracy site. <br /> Regional Water Board staff has not commented in this letter on the adequacy of responses <br /> to the Northwest Corner area dieldrin plume, the trichloroethene (TCE) plume east of Banta <br /> Road, the TCE plume at Warehouse 10, and the TCE plume at Area 3. Also, staff has not <br /> commented on the extraction well rebound proposal. DESJC should refer to the following <br /> Regional Water Board review letters that commented on these areas: <br /> • Dieldrin plume in the Northwest Corner area —4 March 2009 review letter for the Draft <br /> Northwestern Corner Dieldrin Plume Feasibility Study Report; <br /> • TCE plume east of Banta Road — 3 December 2008 review letter for the Draft <br /> Groundwater Remedy Enhancement Cone Penetrometer Testing Work Plan; <br /> • TCE plume at Warehouse 10 — 3 November 2008 review letter for the Draft <br /> Warehouse 10 Investigation Report; <br /> • TCE plume at Area 3 — 3 November 2008 review letter for the Draft Remedy <br /> Enhancement Decisions at SVE Sites; <br /> • Extraction well rebound proposal — 24 November 2008 review letter for the OU1 <br /> Rebound Test and Remedial Action Optimization Work Plan. <br /> Regional Water Board staff comments on changes that DESJC has proposed in the Draft <br /> Report to the frequency of sampling of groundwater wells for the 2009 monitoring program <br /> are presented below: <br /> 1. In Table 6.3-1 on page 6-8 of the Draft Report, the sampling frequency for EW014A is <br /> reduced to twice a year. The justification for this reduction includes a statement that <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />