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Privileged and Confidential—attorney Client Communication Geosyn tec <br /> consultatitR <br /> Treatment Technologies for Mining-Influenced Water, 2014). However, due to the <br /> driving site constrains identified at the beginning of this section, it was determined that <br /> some additional hybrid engineered treatment will significantly benefit the overall <br /> system and provide the capability to manage upset conditions and seasonal treatment <br /> challenges. Geosyntec's recommendations for the hybrid treatment approach are <br /> presented in Section 2.3. <br /> 2.3 Conceptual Passive Hybrid Process Flow Diagram <br /> The recommended conceptual passive hybrid treatment process is presented in Figure 2. <br /> The treatment system includes multiple passive treatment technologies, along with a <br /> chemical treatment backup for startup, upset conditions, and/or high flow conditions <br /> that may stress the biological systems. <br /> PGtcnJ <br /> Injections <br /> organic(PH adjuatment, <br /> 11 <br /> 40., .M. trace nutrients) <br /> Transition 1•1• ' <br /> f• ♦ • ♦__.. �•1! M Anaerobic Discharge YO <br /> �• 1Aerobic - C • • Sneffeli Creek <br /> Wetland Weiland <br /> Figure 2: Process Flow Diagram <br /> The treatment objective and criteria for each of these processes is presented in Table 7. <br /> Table 7: Treatment Objectives and Design Considerations <br /> Process Treatment Objective Design Considerations and Items <br /> to be Further Evaluated <br /> • Coagulation and sedimentation to • Appropriate concentration range to <br /> remove metals during upset be evaluated with jars to simulate <br /> conditions or high flow rate coagulation and sedimentation <br /> Hybrid conditions • Maximum concentration of iron <br /> MWP • Iron-based coagulant adds surplus after treatment process should not <br /> iron to react with biologically exceed discharge limit(1,204 ppb) <br /> produced sulfides; iron binds with • Candidate liquid carbon source <br /> hydrogen sulfide to prevent sulfate ethanol to be evaluated in pilot- <br /> formation scale tests <br /> Treatability Study Work Plan 11 February 8,2018 <br />