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i <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> Linda S.Adams Karl E.Longley,ScD,P.E.,Chair Arnold <br /> Secreiaryfor <br /> F.nvironououaf Schwarienegger <br /> Protection Sacramento Main Office Gmrrnnr <br /> 11020 Sun Center Ddve i/200,Rancho Cordova,California 95670-61�F4�(� <br /> Phone www.waterbo •FAX(916)4644645 IuLJllJ f} (j�� /7 D <br /> help://www.waterbnardsca.gov/centralvalley �L ILr��- V <br /> APR 1 0 2008 <br /> 8 April 2008 ENVIRON41ENT HEALTH <br /> PERMIT/SERVICES <br /> DESJC, M.BENSON <br /> Defense Distribution Depot San Joaquin <br /> P.O. Box 960001 <br /> Stockton, CA 95296 <br /> DRAFT WAREHOUSE 10 INVESTIGATION WORK PLAN, DEFENSE DISTRIBUTION <br /> 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 March 2008 Draft Warehouse 10 Investigation Work Plan <br /> (Draft Work Plan). URS Group Inc. (URS) prepared the Draft Work Plan on behalf of <br /> Defense Logistics Agency Enterprise Support San Joaquin, California (DESJC) for the <br /> Defense Distribution Depot Tracy Site (Depot), located in Tracy, California. <br /> The Work Plan proposes to sample soil vapor, soil, and groundwater in and around <br /> Building 10 at the Depot. The samples will be collected with a cone penetrometer testing <br /> (CPT) rig near a former aboveground trichloroethene (TCE) tank in Building 10, at the former <br /> industrial waste pipeline (IWPL) within Solid Waste Management Unit (SWMU) 20, and at <br /> the IWPL within SWMU 33. DESJC is conducting the work to determine whether <br /> contamination in soil vapor, soil, or groundwater beneath Building 10 would be a threat to <br /> site construction workers and if a removal action will be necessary to protect the workers. <br /> The April 1998 DDJC-Tracy Site-Wide Comprehensive Record of Decision (ROD) <br /> established land-use controls for portions of SWMU 20 and SWMU 33. <br /> The Army Corp of Engineers (ACOE) plans to demolish Building 10 and other adjacent <br /> warehouses in 2009 and replace them with one larger warehouse. In order to evaluate the <br /> potential threat to site construction workers, ACOE conducted an investigation of wastes <br /> beneath Building 10 in December 2007 They collected soil samples beneath Building 10 <br /> and found concentrations of TCE, pesticides, and motor oil. Although they detected TCE in <br /> five samples above the soil cleanup standard specified in the ROD, the concentrations of all <br /> contaminants detected were below USEPA Region IX Residential Preliminary Remediation <br /> Goals. Also, on 15 October 2007 ACOE conducted a video survey inside waste pipe <br /> beneath Building 10. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />