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Privileged and Confidential—Attorney Client Communication Geosyntee <br /> consultants <br /> aerobic wetland treatment near the pond effluent. Additional treatment may also <br /> be added upstream of MWP or within the pond to improve treatment <br /> performance (this may include the installation of chemical feed systems). <br /> Supplemental feed systems are also an option for the back end of the MWP to <br /> enhance the performance of downstream biological treatment systems. <br /> • Pond#2: the existing bioreactor system will be removed and replaced with <br /> sulfate reducing bioreactor(SRB) media. The pond will be enlarged as part of <br /> the reconstruction. <br /> • Pond#3: the existing stormwater pond will be converted to an additional <br /> biological treatment step for the new water treatment system. The pond will be <br /> enlarged as part of the reconstruction. A new, permitted Outfall 002A will be <br /> constructed at the end of Pond#3 for discharge into Sneffels Creek. <br /> Using this information, a conceptual passive hybrid treatment pilot system was <br /> constructed based on the process flow diagram presented in Figure 2. The treatment <br /> system includes multiple passive treatment technologies, along with a chemical <br /> treatment backup for startup, upset conditions, and/or high flow conditions that may <br /> stress the biological systems. <br /> Potential <br /> Injections <br /> (pH adjustment, <br /> Coagulant organic carbon. <br /> Addition trace nutrients) <br /> Portal Mine Water Transition Pond#2 Pond#3 <br /> Aerobic Anaerobic --k Difels a to <br /> Water Pond Wetland Bioreactor Wetland Sneffels Creek <br /> Figure 2:Process Flow Diagram <br /> Bench-scale and pilot-scale tests were developed to support the design of the full-scale <br /> system. Table 6 provides an overview of the testing approach and objectives of each test <br /> from the Treatability Testing Work Plan(Work Plan), issued February 2018. <br /> Treatability Testing Report 8 December 11,2018 <br />