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Privileged and Confidential—Attorney Client Communication v e'O`SynteC Consultant,, inmendations in Work Plan • Materials of construction: sand/gra\el mixture,native NN etland vegetation *Assuming no direct sunlight in portal then lighting vo ill need to be installed over each wetland for plants to grow OSMI constructed the pilot according to the recommendations in Table 9; however, due to the construction constraints in the Mine Portal,the aerobic and anaerobic wetlands were unable to be constructed based on the pilot system design assumptions. Specifically, native wetland vegetation was not planted in the aerobic or anaerobic wetlands. Instead, these acted as sand filters throughout the duration of the pilot testing. In addition, due to available material at the time of construction,hay was used in place of corn stover for the SRB and anaerobic wetland media. 2.3.1 Initial Pilot Testing Scope The pilot system began operating on March 22, 2018 and as part of the initial scope operated for 14 weeks with weekly sampling events. No adjustments were made to the MWP or either train during this time due to the slow biological stabilization of the system during cold water runoff, contamination impacts during construction(which delayed proof of concept results), and differences in performance between the two trains that were not the result of difference of feed water changes or other challenge conditions. Both trains were operated at a flow rate of—1 gpm for the duration of the testing with no additional constituents added. The following constituents were measured as part of the pilot system performance monitoring: • Total metals • Dissolved metals • Anions • TSS • TDS • Field parameters • DOC A brief description of each sampling point with frequency is listed below: F2—Outlet of MWP(monthly) Al —Outlet of Aerobic Wetland lA (monthly) Treatability Testing Report 17 December 11,2018