1980-07-11_REVISION - M1977493 (8)

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side of the Mayflower Tailing Pond and end of No. 5 Dam. The westerly surface drainage will be removed through the existing decanters and twin 42-inch decant pipe line. Water from easterly and westerly drainages will be discharged directly into Tenmile Creek. These modifications will fully control floods in the Tenmile Creek drainage basin and assure the longterm stability of the tailing ponds. C. Eagle River. Drainage. The spillways for. Chalk Mountain and Robinson Reservoir are sized to handle a "probable maximum flood . " A spillway has been constructed on No. 4 Dam that is sized to handle flood waters from the Chalk Mountain Reservoir , Robinson Reservoir , and direct snowfall and rainfall on the oxide tailing pond . 6 . Post-Mining Water Quality Control The Climax Post-Mining Water Quality Control Program is based on the premise that the quality of waters leaving the Climax property after. Operations are terminated will comply with applicable water quality requirements. The Water Quality Control Program is discussed below by drainage basin. a. Arkansas River Drainage. The Glory Hole will become a large catchment basin. This impounded lake will probably be some 600 feet deep and be fed by rainfall and snowmelt in the Tenmile Cirque and Glory Hole area. No outflow from the lake would be expected . The only loss of water would be by evaporation and seepage into the ground . The only post-mining effect of the Climax operation on the water in the Arkansas drainage area could be the possible addition of seepage into the groundwater system from the Glory Hole Lake. Natural filtration and dilution will make this water quality comparable to groundwater not affected by Climax operations. It is recognized that 8-12