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Mr. Marshall Cloud <br /> February 6, 2008 <br /> Page 4 <br /> expected to help define the plumes off-site lateral and vertical extents in <br /> round two sampling. Thus, any changes to the proposed decision logic or <br /> well monitoring frequencies should be postponed until all CPT data are <br /> collected and reviewed. <br /> During the January 28, 2008 DESJC-Sharpe Decision Logic Meeting, DTSC <br /> presented an alternative Ground Water Monitoring Frequency Decision Logic <br /> Tree to DESJC-Sharpe developed by the California Base Closure <br /> Environmental Committee (CBCEC). The committee was formed by <br /> representatives from DTSC, the Water Board, U.S. EPA Region IX, and the <br /> U.S. Departments of Army, Navy, Air Force and Department of Defense <br /> (DoD). The CBCEC Ground Water Monitoring Frequency Decision Tree is <br /> widely accepted and implemented at DoD installations nationwide. DTSC <br /> recommends that DESJC-Sharpe use the CBCEC Decision Tree as guidance <br /> in refining its proposed 2008 well monitoring decision logic to better facilitate <br /> future discussions with the regulatory agencies. The CBCEC Ground Water <br /> Monitoring Frequency Decision Tree is attached for reference. <br /> 13.The regulatory agencies were notified during the January 16, 2008 Remedial <br /> Project Managers meeting that Defense Distribution Depot San Joaquin <br /> would be formally changing its name to DESJC effective immediately and that <br /> all future correspondence from DESJC-Sharpe would reflect the change. <br /> DTSC requests that DESJC-Sharpe identify if it intends on updating all future <br /> reports and deliverables, including text, and, if so, identify an implementation <br /> date. <br /> Conclusion <br /> The regulatory agencies are still awaiting the results from the ongoing CPT <br /> investigation fieldwork that is anticipated to help define both the lateral and <br /> vertical extents of on-site and off-site TCE/PCE plumes for the North Balloon, <br /> Central Area, and South Balloon, and will help refine DESJC-Sharpe's <br /> conceptual site model. Discussions regarding changes to the proposed decision <br /> logic or well monitoring frequencies should be postponed until all CPT data are <br /> collected and reviewed by the regulatory agencies. <br />