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California Regional Water Quality Control Board <br /> Linda S.Adams <br /> Central Valley Region <br /> 0 <br /> Secretaryjor Karl E.Longley,ScD,P.E.,Chair Arnold <br /> Emironmenta/ Schwarzenegger <br /> Protection Sacramento Main Office Governor <br /> 11020 Sun Center Drive 9200,Rancho Cordova,California 95670-6114 <br /> Phone(916)464-3291 •FAX(916)4644645 <br /> http://www.waterbouds.ca.gov/mntralvalley <br /> LSoo�v/mnttralvallley <br /> 18 April 2008 CE v(rII�JI <br /> ED <br /> APR ;; 3 2008 <br /> DESJC, M.BENSON ENVIRONMENT HEALTH <br /> Defense Distribution Depot San Joaquin PERMIT/SERVICES <br /> P.O. Box 960001 <br /> Stockton, CA 95296 <br /> DRAFT FOCUSED GROUNDWATER EXTRACTION TEST WORK PLAN, DEFENSE <br /> DISTRIBUTION DEPOT SAN JOAQUIN— TRACY, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water Board) <br /> staff has reviewed the March 2008 Draft Focused Groundwater Extraction Test Work Plan <br /> (Draft Work Plan). URS Group Inc. prepared the Draft Work Plan on behalf of Defense Logistics <br /> Agency Enterprise Support San Joaquin, California (DESJC) for the Defense Distribution Depot <br /> Tracy Site (Site), located in Tracy, California. <br /> DESJC proposes to perform groundwater extraction pumping tests on a select group of <br /> monitoring wells to reduce concentrations of trichloroethene (TCE) and tetrachloroethene (PCE). <br /> The selected wells are screened in the Above Upper, Upper, or Middle Hydrologic Zones <br /> beneath the Site. Twelve wells were selected for potential groundwater extraction because they <br /> contained concentrations of TCE or PCE greater than the aquifer cleanup levels (5 micrograms <br /> per liter for both constituents) during the 3`d or 4th quarters of 2006, or the 151 2nd or 3`d quarters <br /> of 2007. Nine of the twelve wells were selected for groundwater extraction because they were <br /> close enough to existing groundwater extraction system wells to utilize the existing infrastructure <br /> for control of extracted groundwater flow, treatment, and discharge. <br /> Regional Water Board staff has no objection to implementation of the draft Work Plan. If you <br /> have any questions, please contact me at (916) 464-4675, or jbrowneli@waterboards.ca.gov. <br /> R <br /> JJ:am <br /> esR. Brownell, P.G. <br /> gineering Geologist <br /> cc: Mr. Marshall Cloud, DESJC, Stockton <br /> Mr. Michael Work, USEPA Region 9, San Francisco <br /> Mr. Peter MacNicholl, DTSC Region 1, Sacramento <br /> Mr. Harlin Knoll, San Joaquin County Health Department <br /> Mr. Rich Howard, TechLaw, Inc., Sacramento <br /> Ms. Sara Dwight, TechLaw, Inc., San Francisco <br /> Mr. Michael Thomas, URS, Sacramento <br /> California Environmental Protection Agency <br /> 0? Recycled Paper <br />