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• 3.0 Proposed'IYeatmentProces Please see the attached flow sheet for an overview of the treatment process, Lyntek dmwing 07004A-F-OI, (See Appendix A for all drawings) Energy Fuel's is proposing to have a mobile, trailer-mounted treatment system constructed to treat this mine discharge water. The layout of the various treatment components within the trailer is shown on drawing 07004A-G-01. 'Ihe treated water will be released to the existing natural drainage. The resulting sludge will be collected in a lined pond for future disposal of the formed solids. 3.1 Untreated Water Storage Pond Water from the mine will be pumped at a sufficient flow rate to keep the underground workings dry for day to-day work. The water will be pumped directly to the treatrnent system or to an Untreated Water Storage Pond with a single 60.mi1 higlydensity polyethylene (HOPE) liner or equivalent. A 60-mil HOPE liner will typically have a permeability of 1 x 10"12 centimeters per second or less. Details of the pond design are shown in Lyntek Drawings 07004A-C-10 (Map T-1) and 07004A-C-11 (Map T-2). The Untreated Water Pond, as shown in Table 3.1 below, has approximately 21,400 cubic feet of storage (equivalent to 160,000 gallons of untreated water) with an additional 1.5 • feet of freeboard (equivalent to 56,000 gallons in freeboard capacity). The pond will be incised and will have excavated slopes of 2H:1 V with a total depth of 10 feet. The pond can hold 11 days ofprojected ground water inflow into the mine (i.e., conservative estimate of 7 GPM or 10,000 gallons a day) plus 50,000 gallons of direct precipitation and projected surface water runoff from a future ore pad in the event of a 100-year storm event. Under normal circumstances, an operating volume of 20,000 gallons would be stored in the pond. This would allow for nine days of continued pumping at 7 GPM in the event that the treatment system needed to be repaired. Table 3.1 -Untreated Water Storage Pand Sizing Len th to 85 Ft. Width to 62 Ft. Len th Bottom 45 Ft. Width Bottom 22 Ft. De h 10 Ft. Side slo 2:1 Free Board 1,5 Ft. O orating Volume CuFt 2 673 Galons 20,000 Total Volume CuFt 21,383 Gallons 159,800 To prevent overflow of the Untreated Water Pond, a level sensor will be installed in the pond and will be interconnected to the mine water pump. If the pond ever reaches the • preset maximum level, the level sensor will automatically shut off the mine pump until the water level in the pond is lowered. Installation and operation of the level sensor is discussed in more detail in Section 6.0, Monitoring Systems.