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radius of influence (ROI) to ground water extraction, based on pilot test <br /> data, is anticipated to be 100 feet. Dual phase extraction well placement, <br /> the ground water ROI for each dual phase extraction well, and the <br /> corresponding ground water plume capture zone for A-zone ground <br /> water are shown in Drawing G-1. <br /> Ground water analytical data from recent monitoring events was <br /> reviewed to establish expected VOC concentrations in ground water <br /> extracted at dual phase extraction well and corresponding design <br /> parameters for the Treatment System. Extracted ground water VOC <br /> concentrations are presented in Table 4-3. Due to the turbulent conditions <br /> in the extraction tube, it is anticipated that approximately 90 percent of <br /> VOCs in ground water will be stripped to the vapor phase. Therefore, <br /> VOC concentrations in ground water influent to the Treatment System <br /> will be lower than in ground water within each extraction well. <br /> TABLE 4-3 <br /> Influent VOC Concentrations from Dual Phase Extraction Wells <br /> Constituent VOC Concentration in Ground Treatment System Influent <br /> Water Ground Water Concentration <br /> (ug/L) (dual phase extraction well <br /> contribution) <br /> u /L <br /> cis 1,2-Dichloroethene 87.6 8.8 <br /> 1,1-Dichloroethane 42.3 4.2 <br /> Vinyl Chloride 103.4 10.3 <br /> Benzene 2.3 0.2 <br /> Total HVOCs 253.4 25.3 <br /> Total AVOCs 15.9 1.6 <br /> 4-7 <br />