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Privileged and Confidential—Attorney Client Communication Geosyntec U <br /> consultants <br /> Through the analysis, we determined that the lowest viable flow rate that can be scaled <br /> up with confidence and reliably measured through the pilot-scale system is at least 1 <br /> gpm. Based on that assumption, we sized the equipment for a 1 gpm flow rate through <br /> the pilot-scale system for each SRB train. This simulates low-flow conditions and is <br /> equivalent to approximately a 200 gpm flow rate through the full-scale system based on <br /> the equipment sizing calculations, which adds some conservatism to the pilot system <br /> testing by slightly reducing contact time in the biological systems as compared to a 100 <br /> gpm equivalent. The pilot-scale system can be ramped up to approximately 5 gpm for <br /> each SRB train to simulate the higher flow conditions of the full-scale flow rate (design <br /> high of 1,215 gpm). <br /> The pilot test approach includes two bioreactor tanks and anaerobic wetlands working <br /> in parallel after a single MWP. Due to the limited timeframe available for the pilot test, <br /> this will allow for greater manipulation of operating variables to find optimal <br /> conditions. Since there are two trains of SRBs, the influent to the pilot will range from 1 <br /> to 10 gpm. The pilot-scale design assumptions for each process are listed in Table 11. <br /> The system design assumes gravity flow through the process after the initial pumping <br /> into the Hybrid MWP. <br /> Table 11: Pilot-Scale Design Assumptions <br /> • Pump will provide flow rates of approximately 1 to 10 gpm <br /> (depending on pump availability,one pump may be required for <br /> Pumping to Pilot the low end of this range and a different pump for the high end) <br /> Scale System . In order to verify flow rate,periodic bucket tests will be conducted <br /> • Valves will be used to adjust flow rates as needed <br /> • Geosyntec has identified a rental unit that is a pre-engineered 10 to <br /> 20 gpm pilot-scale mobile unit with chemical feed,coagulation, <br /> flocculation,and sedimentation treatment capabilities <br /> o Unit weighs 1,000 pounds unloaded(14,000 pounds full of <br /> water)and is approximately 10 feet long,6 feet tall,and <br /> Hybrid MWP 3.5 feet wide <br /> o Unit to be shipped from Golden,CO <br /> o See Attachment 2 for equipment specifications <br /> • if OSMI preference is to construct a Hybrid MWP,Geosyntec can <br /> help with the design assumptions for each step in the treatment <br /> process <br /> Aerobic . Two 55-gallon barrels in parallel <br /> Wetland* <br /> Treatability Study Work Plan 19 February 8,2018 <br />