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Privileged and Confidential-attorney Client Communication Geosyntec D <br /> consultants <br /> Mine Portal Water <br /> lit F1 <br /> Pump <br /> lkir <br /> X F2 <br /> r <br /> Aerobic Aerobic <br /> Wetland lA Wetland IB <br /> A 1 X XB1 <br /> SRB A SRB B <br /> A2 X B2 <br /> T <br /> Anaerobic Anaerobic <br /> Wetland A Wetland B <br /> Flow to F ''" Aerobic Flow to <br /> �� Aerobic . � � � �_� <br /> dramA 1 Wetland 2A A3 B3 Wetland 2B B4 dram <br /> *Green X indicates sampling locations <br /> Figure 6:Pilot-Scale Test Schematic <br /> Geosyntec calculated the pilot-scale flow rates based on the full-scale residence times <br /> through each process and scaled down the pilot size as low as possible to reduce <br /> construction costs. Through the analysis, we determined that the lowest viable flow rate <br /> that can be scaled up with confidence and reliably measured through the pilot-scale <br /> system is at least 1 gpm. Based on that assumption, we sized the equipment for a 1 gpm <br /> flow rate through the pilot-scale system for each SRB train. This simulates low-flow <br /> conditions and is equivalent to approximately a 200 gpm flow rate through the full-scale <br /> system based on the equipment sizing calculations, which adds some conservatism to <br /> the pilot system testing by slightly reducing contact time in the biological systems as <br /> compared to a 100 gpm equivalent. The pilot-scale system was constructed based on the <br /> Treatability Testing Report 15 December 11,2018 <br />