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Mr. Marshall Cloud <br /> March 13, 2008 <br /> Page 4 <br /> 15. Page 6-1, Section 6.2.3; The TCE plume in the Middle Hydrologic Zone, <br /> down-gradient of EW024B and EW025, is not adequately delineated to the <br /> cleanup goal of 5 pg/L and should be delineated in future remedial actions. <br /> The report should refrain from presenting solid isopleth lines defining the <br /> lateral extents for the contaminant plumes unless supported by validated <br /> ground water analytical data. <br /> 16. Page 6-1, Section 6.2.4, third sentence; See comment#13. <br /> 17. Page 6-5, Table 6.3-1, Recommendations for Sampling Frequencies; DTSC <br /> will be participating in a planned working meeting with DESJC-Tracy <br /> stakeholders scheduled for April 1St and 2nd to discuss the 2008 Proposed <br /> Well Sampling Frequencies for DDJC-Tracy. DTSC will reserve any <br /> comments and recommendations on well sampling frequencies until that time. <br /> If you have any questions or comments regarding this letter, please feel free to contact <br /> me at (916) 255-3713, or e-mail me at pmacnich(a)dtsc.ca.gov <br /> Sincerely, <br /> ell <br /> Peter MacNicholl, P.E. <br /> Remedial Project Manager <br /> Office of Military Facilities <br /> See attached DESJC Distribution List <br />