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to control dust and drainage, other disturbed areas (including topsoil stockpiles) are stabilized with temporary <br />vegetation, and structures are painted in neutral earth -tone colors to blend with the natural surroundings. <br />As shown on Map 23, additional entries were driven to the north from the ventilation shaft site. These entries are <br />needed to maximize the efficiency of the ventilation system. The entries were driven in the same manner as TCC's <br />development work, i.e. continuous miners and shuttle cars. <br />Buffalo Forge Fan Silencer (MR 03 -187) <br />A new silencer will be installed on the Buffalo fan at the NW Mains Ventilation Shaft location. Installation of the <br />silencer will require construction of foundations utilizing concrete piers and concrete grade beams. The foundation <br />will require eight concrete piers (6 -inch radius x 20 feet deep) and then placement of two concrete grade beams <br />(12" x 2' x 31') on top of the piers. The concrete grade beams will be reinforced with three #5 rebar, and #4 <br />stirrups spaced at 8 inches on center within 3 feet of the piers, and spaced at 16 inches on center at all other <br />locations.. The installation of the silencer will occur within the existing disturbed area. The silencer is essentially <br />a box containing baffles, which will be approximately 31 feet long, 21 feet wide, and 20 feet high. The location of <br />the vent shaft and silencer is shown on Map 24. <br />NW Mains Ventilation Fan Sound Deflector /Absorber (MR05 -192) <br />As part of TCC's ongoing efforts to minimize potential mine impacts on area residents, a sound deflector /absorber <br />unit will be installed on the NW Mains Ventilation Fan. The unit is designed to deflect fan exhaust, and to both <br />absorb and deflect any associated sound approximately 90 degrees from its current discharge direction. Installation <br />of the sound deflector /absorber unit will require construction of foundations utilizing concrete piers and concrete <br />grade beams. The foundation will consist of twelve concrete piers (12 -inch diameter x 15 -21 feet deep), supporting <br />two curved reinforced concrete grade beams (12 inches wide x 2 feet deep x 31 -64 feet long), with a reinforced <br />concrete slab between the grade beams. Two concrete piers will be poured on either side of the foundation to <br />provide for side - bracing of the sound deflector /absorber structure. The sound deflector /absorber unit will be a <br />fabricated curved steel structure, lined with sound absorbing material, approximately 12 feet wide x 20 feet high x <br />45 feet long (along center -line of curvature). <br />Installation of the sound deflector /absorber unit will be on the existing NW Mains Ventilation Fan pad and will not <br />involve any new disturbance. The location and configuration of the unit is shown on Map 24 and Figure 31. As a <br />passive sound control device, the only required maintenance will involve periodic inspection and cleaning. When <br />the unit is no longer needed to control sound emissions from the ventilation fan, it will be removed and will either <br />be re -used elsewhere or salvaged. Foundations will be demolished and removed in conjunction with demolition <br />and restoration of the ventilation fan installation. <br />18 -Right Ventilation Shaft (TR 04 -44, TR05 -50, MR04 -190, MR05 -200, MR07 -225, MR08 -229) <br />As mine development has proceeded to the north, the distance from existing mine ventilation fan installations has <br />increased to the point where an additional intake ventilation shaft is necessary to maintain effective ventilation of <br />active mining areas. The new ventilation shaft is located adjacent to Fish Creek in Section 10, T5N, R86W on a <br />low rise above the Fish Creek drainage, as shown on Maps 23 and 23B. Development, construction, and <br />installation of the ventilation shaft and fan installation (Figures 30 and 30a) involved the following sequential <br />activities, as briefly described in the following sections: <br />• Completion of environmental and engineering investigations <br />• Placement of disturbed area markers <br />• Marking of stream and wetland buffer zone <br />• Temporary drainage and sediment control measures <br />• Recovery and stockpiling of available topsoil <br />• Installation of drainage and sediment control structures <br />• Construction of an access road and site preparation for shaft pad <br />TR09 -66 2.05 -45.3 02/17/09 <br />