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Dan Kirk <br /> Page 2 <br /> 3.) Data indicates that the groundwater contaminant plume has migrated off-site, mainly in <br /> the downgradient direction, to the north-east, and possibly also to the east of the site. In <br /> situations such as this, some degree of hydraulic control over the plume is warranted. It is <br /> unclear how this would be achieved with vapor extraction technology exclusively. <br /> In view of the above concerns, please submit to PHS/EHD, by September 21, 1992, a discussion on the <br /> rationale for amending the previously submitted'l Final Remediation Plan to exclude"groundwater extraction <br /> technology. Data to support the claims and justify the assumptions put forth in the discussion should be <br /> included. The remediation system must be adequate to restore and protect the groundwater beneath the <br /> site. The most cost effective, "best available technology" should be utilized to achieve this.result. <br /> PHS/EHD will consider all data submitted to evaluate the efficiency of the currently proposed remediation <br /> plan and determine whether it will be adequate for this site. <br /> If you have any questions, please contact Linda Turkatte, REHS, of my staff at (209) 468-0339. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health Officer. <br /> -Laurie A. Cotulla, REHS, Program Manager <br /> Environmental Health Division <br /> LAC/LT:lb <br /> c: CVRWQCB-Beth Thayer <br /> c: Aegis Environmental-Laura Odenthal <br /> 1050 Melody Lane, Suite 160 <br /> Roseville, CA 95678 <br />