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6 Facilities Evaluation <br /> EPFs and other facilities are effective at controlling designated chemicals and acid generating <br /> materials. <br /> The EPF (i.e., new Reagent Room) discussed in this EPP is shown in the attached Figure U-1, <br /> and a list of reagents stored on site is provided in Table U-2. The Reagent Room is designed to <br /> contain 100% of the maximum amount of the reagents stored. In addition to the Reagent Room, <br /> several other facilities throughout the site operate to control and contain chemicals and materials. <br /> Total containment for the on-site facilities is provided in Table U-3, which demonstrates <br /> adequate containment of the 10-year 24-hour storm event per Rule 7.3.1(3). <br /> Tailings from milling operations will be stored permanently on site in one of two TSFs as <br /> described in Exhibit D. These facilities will contain a blend of tailings and waste rock and will be <br /> reclaimed in place once mining and processing is complete. <br /> Waste rock generated from development mining and mining of ore will be permanently placed as <br /> backfill in the mined-out stopes or used to blend with tailings as part of the final design of the <br /> TSFs. Waste rock also will be tested and crushed for use as road base on and off site. A copy of <br /> the most recent analysis of waste rock is provided in Appendix 7. <br /> 6.1 TSF BMPs <br /> To effectively control the tailings placed in the TSFs, the following best management practices <br /> are followed. <br /> - Runoff from the undisturbed south hillside is diverted away from the TSF embankment, <br /> using diversion ditches designed for the 10-yr, 24-hr storm event. <br /> - TSFs and waste rock embankments will be capped with a minimum of 6 inches of topsoil <br /> and planted with a stable mix of native grasses and forbs per Exhibit E. The vegetation is <br /> expected to minimize erosion and will absorb most of the direct precipitation and surface <br /> water runoff that occurs on the reclaimed embankment. This will minimize the amount of <br /> water that can percolate into the reclaimed waste material. Details of this plan are shown <br /> in Exhibit E. <br /> - The gradual slopes and revegetated surface of the waste rock embankment will minimize <br /> erosion of topsoil and prevent exposure of the underlying waste rock. <br /> - The permeability of the waste rock is reduced by the compaction that is specified (94% of <br /> maximum dry density) of the waste pile. The material is compacted in thin lifts to achieve <br /> this compaction. This compaction also serves to greatly improve the slope stability of the <br /> permanent pile. <br /> M-2012-032 <br /> Amendment 02 Exhibit U <br /> December 2021 U-15 <br />