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effectiveness of the groundwater remediation effort. Existing VWs will be used for soil <br /> vapor extraction as the vadose zone depth increases as predicted by AGE. <br /> EHD requests the following information: <br /> 1. A demonstration that four additional EWs are required to adequately address <br /> the plume of impacted groundwater, such as a drawing of the site with the <br /> locations of the EWs , the.plume of impacted groundwater, the'groundwater <br /> flow direction, and the predicted capture zone of the EWs. <br /> 2. Submit a remediation time line with.groundwater cleanup goals. using <br /> groundwater pump and treat in conjunction with soil vapor extraction verses <br /> groundwater air.sparing with,soil vapor extraction. <br /> 3. Prepare a cost estimate for the groundwater pump and treat system in <br /> conjunction with soil vapor extraction including the additional EW <br /> installations,.maintenance and operation of the system based upon the �. <br /> remediation time line established.. <br /> 4. Prepare a cost comparison analysis for groundwater pump and treat in <br /> conjunction with soil vapor extraction verses groundwater air,sparing with.soil <br /> vapor extraction. The installation of,additional vapor and air sparge wells will <br /> be required and should be included in cost analysis. <br /> i <br /> Please provide the additional information to EHD by September 2, 2002.. <br /> If you have any further questions regarding this matter, please contact Harlin Knoll at <br /> (209) 468-3442. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Harlin Knoll, Senior REHS Nuel C. Henderson, Jr.; R.G. <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> c: CVRWQCB-Marty Hartzell <br /> AGE <br /> k <br /> HkICAPSTKNPLATE <br />