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Revised OR Levir►e•Fsicke <br /> considerations of wells spacing, vacuum rates, and number of pore volume flushes to <br /> design the full scale SVETS, if it is appropriate for the Lodi Site <br /> LFR is using the combination of ROI data, air permeability data, and pore gas velocity <br /> considerations to assess system effectiveness and design since recent studies have <br /> indicated that designs based solely on TMROI may result in low pore gas velocities in <br /> the subsurface at the outer edges of the TMROI (DiGiulio and Varadhan 2001) This <br /> could result in delay or lack of remediation of contanumted sediments and extend the <br /> overall penod of remediation. Therefore, LFR will use conservative methodologies to <br /> evaluate the optimum well numbers and spacing, flow rates, and induced vacuum at <br /> extraction wells that will result in sufficient air flow in the subsurface to ensure <br /> thorough and timely completion of soil remediation. <br /> 7.0 PHASE 111 PILOT TEST (SVEIGAS) <br /> 7.1 Phase III Pilot Test Goals <br /> After completion of the Phase Ii SVE pilot test, a longer duration vapor extraction pilot <br /> test with concurrent shallow-zone groundwater air spargmg (SVElGAS) pilot study will <br /> be performed at the Site <br /> The goal of the Please III SVE/GAS pilot testliavestigation will be to evaluate the <br /> following. <br /> assess the combined effectiveness of the long-term vapor extraction and <br /> groundwater air sparging in reducing vadose zone anchor groundwater PCE <br /> concentrations <br /> assess the area of influence of the air sparging wee to identify optimum well <br /> spacing(s), establish design cnwria, and support design of the groundwater sparging � <br /> system through the assessment of applicability, effectiveness, and cast <br /> • collect the data necessary to assess the area of influence of the air sparging well, <br /> including <br /> changes in organic and inorganic groundwater chemistry such as dissolved <br /> oxygen, alkalinity, hardness, and pH <br /> water-level changes/pressure responses in niowtoring wells during groundwater <br /> circulation and air sparging <br /> air sparging flow rates and corresponding pressure responses in the momtonng <br /> wells <br /> collect groundwater VOC concentration data from monitoring wells surrounding <br /> the air sparging well to monitor the effeetzveiiess of this remediation technology <br /> over a set tune at the Pwperty <br /> wp-5v£GS Lode-rvva123 d"1tr Page 21 <br /> Ob/9 T d 82 T009b60ZT QI 9060 e99 OTS 3>0 I d3 3N I ATI aJ-1 dd 6£ 91 M, 60 -ilii <br />