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January 6, 2020 <br />Page 3 <br /> <br /> <br /> <br /> <br />Figure 2: New C Zone Extraction Well – Alternative 2 <br /> <br />Figure 1 shows backward particle tracks from new C Zone well location “Alternative 1,” <br />which is in the offsite open area west of the railroad tracks approximately adjacent to <br />existing well EWNB6. The capture area of this new well location appears adequate to <br />intercept groundwater areas impacted by TCE in the offsite area (see the red dot locations <br />on the figure). The TCE plume depicted on the figure (blue shaded areas) are partially <br />captured by the new well, but fall within the capture zones of existing wells EWNC4R and <br />EWNC6, which explains the relative gap in the new well’s capture zone in that area. <br /> <br />Figure 2 shows a the capture area for new C Zone well location “Alternative 2,” which is in <br />the same offsite property as Alternative 1, but shifted north into the parking area south of <br />Roth Road. This alternative shows a similar capture configuration as Alternative 1, but may <br />more comprehensively capture TCE associated with offsite grab groundwater samples <br />north of Roth Road. Locations HP1703 and HP1702, in particular, are farther from the edge <br />of the capture zone in Alternative 2 as compared to Alternative 1. <br /> <br /> <br /> <br />