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California4egional Water Quality Cool Board <br /> y <br /> Linda S.Adams Central Valley Region �•- • <br /> Secretoryfo,. Karl E. Longley,SCD, P.E.,Chair Arnold <br /> Environmemnl Protection Schwartenegger <br /> 11020 Sun Center Drive 9200,Rancho Cordova.California 95670-6114 Governor <br /> Phone(916)464-3291 •FAX(916)464-4645 <br /> http://v v watertwards ca.gov/centralvelley <br /> 13 March 2009 <br /> DESJC, M.BENSON <br /> Defense Distribution Depot San Joaquin <br /> P.O. Box 960001 <br /> Stockton, CA 95296 <br /> GROUNDWATER MONITORING WELL INSTALLATION WORKPLAN, LM193AU, <br /> WAREHOUSE 10, DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN— TRACY, SAN <br /> JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff has reviewed the March 2009 Groundwater Monitoring Well Installation Work <br /> Plan, LM193AU, Warehouse 10 (Work Plan). URS Group Inc. (URS) prepared the Work <br /> Plan on behalf of Defense Logistics Agency Enterprise Support San Joaquin, California <br /> (DESJC) for the Defense Distribution Depot Tracy Site (Depot), located in Tracy, California. <br /> Regional Water Board staff believes that DESJC should move the proposed monitoring well <br /> location approximately 60 feet north of the location proposed on Figure 2 of the Work Plan. <br /> This would place the monitoring well near CP0835 on Figure 2. This location is better <br /> because it is within the area of highest trichloroethene (TCE) concentrations detected in soil <br /> and soil vapor, and still within the area of elevated TCE concentrations detected in <br /> groundwater. For your reference, I have attached our 3 November 2008 review letter. The <br /> map attachments of that letter show the TCE concentration contours expected for soil, soil <br /> vapor, and groundwater beneath Warehouse 10. <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 /> Associate Engineering Geologist <br /> cc: 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, Stockton <br /> Mr. Rich Howard, TechLaw, Inc., Sacramento <br /> Mr. Michael Thomas, URS, Sacramento <br /> Mr. Rich Beyak, URS, Sacramento <br /> Mr. John Clark, URS, Sacramento <br /> California Environmental Protection Agency <br /> Qi Regrled Paper <br />