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pad, topsoil will be stripped to a minimum depth of 12 inches and the material will be stockpiled at the <br />perimeter of the pad for later use in reclamation. These perimeter topsoil berms will also isolate the <br />vent shaft areas from the surrounding drainages. All drainage from the ventilation shaft areas will be <br />kept on site by the topsoil berms, which will be seeded since they will be present for a number of <br />years. <br />Once the shafts are completed and cased, asingle-vane axial fan with a diffuser will be mounted on top <br />of each hole. These units are typically about three to five feet high and have metal grates on top. Taller <br />diffusers may be installed if additional noise reduction is required. The diffusers will be painted a <br />BLM-approved color to blend in with the surroundings. <br />The fans will be powered by electricity from nearby power poles and each unit will have locked <br />breaker boxes at the power drop. Some additional poles and transformers will be needed to access <br />some locations and temporary generators may used in some areas until the power is completely <br />established. The vent shafts have been located adjacent to existing access roads. Surface disturbance at <br />each vent shaft is estimated to be 0.23 acres consisting of a small pad area (typically 100 feet by 100 <br />feet) that includes a 15-foot-wide, two-track access road. Fencing and locked gates may be added at <br />each vent shaft location for security purposes if required by the BLM. The vent shafts will be inspected <br />periodically during operation (i.e., average of once per day) by Energy Fuels personnel. <br />17. Power Drop Locations <br />Map C-lA shows a permit area of 0.41 acres located approximately 1,100 feet southwest of the Packrat <br />portal area. This area has been previously disturbed by past mining operations. The current site is <br />relatively flat and contains two abandoned power poles surrounded by a chain link fence and an <br />abandoned steel air receiver tank a short distance away. An existing borehole was drilled in the past to <br />allow power to enter the mine. Energy Fuels plans to use the same boring or install a new cased 6-inch <br />diameter hole to allow power to enter the mine. San Miguel Power will re-connect the power to the site <br />from poles in the surrounding area. As seen on Map C-lA, the site currently has existing access roads <br />that enter the pad area from the south and the north. These roads will not be part of the DRMS permit <br />• area. <br />Whirlwind Mine 07 (rev. April 08) D-27 <br />