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r <br /> Page 2 <br /> 632 S. EI Dorado Street <br /> The FRP has selected groundwater pump and treat in conjunction with soil vapor extraction. <br /> Four additional EWs are proposed to increase the capture zone,and increase effectiveness of the <br /> groundwater remediation effort. Existing VWs will be used for soil vapor extraction as the vadose <br /> 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 the <br /> plume of impacted groundwater, such as a drawing of the site with the locations of <br /> the EWs , the plume of impacted groundwater,the groundwater flow direction,.and <br /> the predicted capture zone of the EWs. <br /> 2. Submit a remediation time line with groundwater cleanup goals using groundwater. <br /> pump and treat in conjunction with soil vapor extraction verses groundwater air <br /> sparing with soil vapor extraction. <br /> 3. Prepare a cost estimate for the groundwater pump and treat system lin conjunction <br /> with soil vapor extraction including the additional EW installations, maintenance and <br /> operation of the system based upon the remediation time line established. <br /> 4. Prepare a cost comparison analysis for groundwater pump and treat in conjunction <br /> with soil vapor extraction verses groundwater air sparing with soil vapor extraction. <br /> The installation of additional vapor and air sparge wells will be required and should <br /> be included in cost analysis. <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(209)468- <br /> 3442. <br /> Donna Heran, REHS, Director a <br /> Environmental Health Division <br /> Harlin Knoll, Senior REHS Nuel C. Henderson, Jr., R.G. i <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: CVRWQCB-Marty Hartzell <br /> cc: AGE <br />