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Privileged and Confidential—Attorney Client Communication Geosyntec° <br /> consultants <br /> 2.3.3 Pilot-Scale MRI Unit Testing <br /> During the week of August 13, 2018, pilot-scale tests were run using the pre-fabricated <br /> MRI Plate Settler/Flocculator Pilot Unit to evaluate coagulant dose, pH impact, and <br /> sulfuric acid dosage necessary to neutralize water prior to entry into the bioreactor. The <br /> MRI unit testing was performed by a Geosyntec staff member and OSMI employees. <br /> Results from this testing will be used to support the design of the coagulation, <br /> flocculation, and sedimentation treatment steps in the full-scale design of the MWP. <br /> Water for this test was routed from the Mill Water Feed directly into the MRI unit. <br /> Based on calculations from the Ouray Silver Mine Treatability Study Work Plan(Work <br /> Plan, February 2, 2018), a flow through the pilot system is representative of high flow <br /> conditions through the full-scale system. The MRI unit is designed for a flow capacity <br /> of 10-20 gpm, so these tests were run at a 10 gpm flow rate. <br /> The MRI unit consists of a 2-stage variable speed paddle wheel flocculator with <br /> stainless steel flocculation baffles. From the flocculator, water runs into a settling basin <br /> with inclined plate settlers. Prior to water entering the MRI unit,both a ferric chloride <br /> coagulant and a caustic solution were dosed directly into the pipe using pressure nipples <br /> and peristaltic pumps. Photos of the MRI unit testing setup are shown in Figures 7-8. <br /> Treatability Testing Report 19 December 11,2018 <br />