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Page 2 of 2 <br /> w <br /> Ally, <br /> In follow-up to our conversation , the EHD reviewed the DPE interim remediation work plan <br /> dated 5/24/10. The EHD could not locate a Feasibility Study (FS) that identifies DPE as the most cost- <br /> effective technology for the site. The cost effectiveness would need to be evaluated prior to approving it. <br /> In addition , we need to have mass estimates prepared for sorbed contaminants in the vadose and <br /> saturated zones and what will each component (SVE, GWE) will address . The EHD shall send out a <br /> response letter addressing the need for a Feasibility Study and mass estimate. If you have any questions <br /> please contact me. Thanks. <br /> Frank Girardi , Senior REHS <br /> San Joaquin County Environmental Health Department <br /> 600 E . Main Street <br /> Stockton , CA 95202 <br /> (209) 953-7868 (Office) <br /> (209) 468-0341 (Fax) <br /> e-mail: fgirardi@sjcehd .com <br /> 7/6/2010 <br />