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February 23, 2023 <br /> Page 2 <br /> the projected long term model run and is documented in Appendix D of the 2021-2022 FFA <br /> Annual Progress Report. <br /> Particle tracking analyses were performed according to this method over successive <br /> iterations to identify the most viable configuration for the proposed new extraction wells. <br /> The following sub-sections summarize the results of this iterative approach. <br /> Baseline Scenario <br /> Figure Al shows the results of particle tracking with no new extraction wells added. <br /> Particle track flow paths are depicted from their origins in the perimeter of the combined <br /> TCE/PCE/CT plume in the C Zone to their downgradient termination points. <br /> The baseline scenario shows incomplete capture of the head of the COC plume to the West <br /> of the Central Area. Baseline well configuration used in the model can be found in Table 6-1 <br /> in the 2021-2022 FFA Annual Progress Report. <br /> Scenario 1 <br /> Figure A2 shows the results of particle tracking for the first extraction well scenario. New <br /> proposed extraction well locations are depicted in red to differentiate from existing <br /> extraction wells. Particle track flow paths are depicted from their origins in the perimeter of <br /> the combined TCE/PCE/CT plume in the C Zone to their downgradient termination points. <br /> Scenario 1 resulted in mostly complete capture of COCs by the expanded extraction <br /> network,with the exception of some incomplete or inefficient capture of the northernmost <br /> plume west of the Sharpe facility boundary. <br /> Scenario 2 <br /> Figure A3 shows the results of a revised extraction well configuration used for Scenario 2. <br /> Proposed well EWC9 was moved from the Scenario 1 location to the residential area west <br /> of the Site in order to provide capture and plume containment for offsite COCs. However, <br /> based on these results, it was concluded that EWC9 in this location was somewhat <br /> redundant and would provide relatively inefficient capture of the COC plumes. <br /> Scenario 3 <br /> Figure A4 shows the results of another revised configuration in Scenario 3. In this scenario, <br /> EWC9 was moved closer to the offsite COC plume onto the railroad right-of-way. Because <br /> this is closer to the core COC plume areas,it is anticipated that EWC9 would provide more <br /> efficient mass removal and plume containment in this location. <br /> inte <br /> rel <br /> ra�s�llioq IM <br />