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DocuSign Envelope ID: EBE28081-13782-41342-BAD13-D8C9313687131B <br />TOXICITY REDUCTION EVALUATION — LINES OF INVESTIGATION <br />Cost Evaluation <br />Field Test: The most promising configuration and operational plan would then be up -scaled to a small <br />rocked -filled trench -based linear bioreactor located at the site. This field test could be completed in <br />parallel with much of the design if the schedule requires, but it is likely some important site factors cannot <br />be adequately recreated in the laboratory; therefore, prior to construction, the concept would be proved - <br />out through a summer and winter season. Performance data from such a test could be used to optimize <br />the design prior to finalization. This information would also more accurately model actual operation, <br />providing small-scale lessons -learned that can be incorporated into system start-up, enhancing full-scale <br />bioreactor performance from the start. <br />Assuming the channel and pond liner and collection system is installed during the bench tests, the field <br />test period would also allow time for collection of seep -water -only water quality, flow, and temperature <br />ranges to better ensure the final design is properly sized. Stantec will recommend a duration for the field <br />test with final determination based on input from Colowyo. <br />COST EVALUATION <br />Cost estimates have been prepared for both the passive and active treatment options. The purpose of <br />these cost estimates is to quantify the potential investment required for the treatment as well as identify <br />the operational requirements. The cost factors used for these two options are different given that the <br />construction approaches are substantially different. The BSR process is primarily earthwork, which <br />Colowyo has expressed an interest in self performing, with minor electrical and mechanical setup <br />required. Membrane separation, however, requires several standalone automated skids and will require <br />several coordinated disciplines for design and construction. Each cost has been developed based on the <br />design concepts discussed in Section 2.2. <br />3.1 SUMMARY OF DESIGNS <br />The membrane separation system is assumed to reside in an industrial building located adjacent to the <br />East Taylor Pond. This approach uses the pond for equalization capacity and to handle sediment that is <br />removed and backwashed from the process. The treatment process described above includes: <br />• Influent Pumps <br />• pH adjustment and Air stripping <br />• Granular Media Filtration <br />• NF Membrane Separation <br />• Effluent Neutralization <br />• Brine Evaporation Pond <br />• Enhanced Evaporation Sprinkler System <br />dpg \\us0321-ppfss011shared_projectsV33001407\reports\4_tre lines of investigationitre lines of investigation_20200320_ifra.docx 3.12 <br />