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California Regional Water Quality Control Board <br /> Central Valley Region > <br /> Karl E.Longley,ScD, P.E.,Chair Arnold <br /> Linda S.Adams 11020 Sun Center Drive#200, Rancho Cordova, California 95670-6114 Schwarzenegger <br /> Secretary for Phone(916)464-3291 •FAX(916)464-4645 0� Governor <br /> Environmental httpll/wvw.waterboards.ca.govlcentralvalley n�D� <br /> Protection <br /> FN(r ✓rl� 4 zu/% <br /> 29 December 2009 I'90 ISFR <br /> ' J 0 <br /> Tj <br /> N6, (/�ES TH <br /> DESJC, M.BENSON <br /> Defense Distribution Depot San Joaquin <br /> P.O. Box 960001 <br /> Stockton, CA 95296 <br /> SITE P-5A <br /> DEFENSE DISTRIBUTION IIAL DESIGN DEPOT SAION FOR N JOAQUINF DEFENSE <br /> SS AGENCY, <br /> SITE <br /> The California Regional Water Quality Control Board, Central Valley Region (Central Valley <br /> Water Board) staff has reviewed the Draft Remedial Design/Remedial Action Work Plan for <br /> Soil Vapor Extraction at Site P-5A (Work Plan) received on 2 November 2009. The Work Plan <br /> was prepared by URS Group, Inc., on behalf of the Defense Logistics Agency Enterprise <br /> Support San Joaquin, California (DLA). <br /> DLA proposes to advance five push borings to approximately 14 feet beneath Site P-5A, <br /> pneumatically fracture portions of the vadose zone, and install soil vapor extraction wells. The <br /> fractures should enhance the effectiveness of the wells for extracting soil vapor with <br /> concentrations of TCE. The Work Plan presents the design for the wells, conveyance piping, <br /> vacuum equipment, and treatment equipment. Central Valley Water Board staff has no <br /> specific comments on the Work Plan. DLA should finalize the Work Plan after considering <br /> U.S. Environmental Protection Agency and California Department of Toxic Substances Control <br /> comments. <br /> If you have any questions, please contact me at (916) 464-4675, or by email at <br /> jbrownell@waterboards.ca.gov. <br /> ?James R. Brownell, P.G. <br /> Engineering Geologist <br /> cc: Mr. Phillip Ramsey, USEPA Region 9, San Francisco <br /> Mr. Peter MacNicholl, DTSC Region 1 , Sacramento <br /> Mr. Harlin Knoll, San Joaquin County Environmental Health Department <br /> Mr. Brian Renaghan, AFCEE, San Antonio, Texas <br /> Mr. Michael Thomas, URS, Sacramento <br /> Mr. David Hofmann, Booz, Allen, Hamilton Inc., San Antonio, Texas <br /> California Environmental Protection Agency <br /> %p Recycled Paper <br />