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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY4�i\f A,i. HEALIiI <br /> NCY <br /> A4`IC=. <br /> Region 9 <br /> 75 Hawthorne street 03 JUN 24 AM 9: 11 <br /> San Francisco CA 94105-3901 <br /> June 16, 2003 <br /> Mr. Maurice Benson <br /> Defense Distribution Depot San Joaquin California, Sharpe Site <br /> DDJC-FA, Attn: Environmental Management <br /> P.O. Box 960001 <br /> Stockton, CA 95296 <br /> RE: Review of Scenario 3: TCE Plume Capture and Containment Issues Appendix D, <br /> Development of a Comprehensive Groundwater Model of the Defense Distribution <br /> Depot San Joaquin (DDJC), Sharpe Site, Lathrop, California, May 2003 <br /> Dear Maurice, <br /> Thank you for the opportunity to review "Review of Scenario 3: TCE Plume Capture and <br /> Containment Issues Appendix D, Development of a Comprehensive Groundwater Model of the <br /> Defense Distribution Depot San Joaquin (DDJC), Sharpe Site, Lathrop, California," May 2003. <br /> In general, the modeling effort described in the Scenario 3: TCE Plume Capture and <br /> Containment Issues, Appendix D (herein referred to as Appendix D) appears conservative. <br /> However, there are a number of data gaps in the conceptual site model that likely increase the <br /> uncertainty in the modeling effort. <br /> Please feel free to contact meat 415-972-3024 if you have any questions. <br /> Sincerely, <br /> Michael Work <br /> Federal Facility & Site Cleanup Branch <br /> Superfund Division (SFD-8) <br /> cc: (See Distribution List) <br /> Attachment <br />