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January 6, 2020 <br />Page 2 <br /> <br /> <br /> <br />location, where particles starting at the end of the predictive period (simulated time <br />October 2049) track backwards from the new well’s screen location. The extent of the <br />particle path lines’ coverage allows for estimation of the new well’s capture area. <br /> <br />The figures below show the results of this capture analysis for two potential new extraction <br />well locations. The backward particle tracks are shown in pink lines overlaid onto a figure <br />of monitoring well locations and analytical results provided by Ahtna, which also shows <br />the extent of TCE within the northwest portion of the Site as of 2018. <br /> <br /> <br />Figure 1: New C Zone Extraction Well – Alternative 1 <br />