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Mr. Maurice Benson <br /> March 4, 2010 <br /> Page 3 <br /> Conclusions <br /> DTSC concurs with the proposed SVE configuration and VE locations, as these <br /> wells appear to target the areas where residual TCE mass remain in the <br /> unsaturated soil. SVE optimization efforts are anticipated in order to reach the <br /> cleanup standards in the Record of Decision (ROD). SVE Termination or <br /> Optimization Process may also be used to help determine when the contaminant <br /> concentrations in soil no longer impact the groundwater at levels greater than the <br /> ROD cleanup standards by the use of VLEACH modeling or other similar <br /> accepted methods. <br /> If you have any questions or comments on this letter, please feel free to contact <br /> me at (916) 255-3713 or e-mail at i)macnichta-�.dtsc.ca.gov <br /> Sincerely, <br /> ""&/4�z� <br /> Peter MacNicholl, P.E. <br /> Remedial Project Manager <br /> cc: See next page. <br />