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ditch and drainage structures. Active use azeas will be graveled to control dust and drainage, other disturbed azeas (including topsoil stockpiles) will be stabilized with temporary vegetation, and any structures will be painted in neutral earth-tone colors to blend with the natural surroundings. As shown on Map 23, additional entries will be driven at the back of the 18-Right gate road to the east to connect with the ventilation shaft. These entries will be needed to maximize the efficiency of the ventilation system. The entries will be driven in the same manner as is used in TCC's development work, i.e. continuous miners and shuttle cars. 6-North Mains Ventilation Shaft (TROS-48, MR06-208, MR06-210) An additional intake ventilation shaft is necessary to maintain effective ventilation of active mining areas in the northwest mining district and future west mining district. The new ventilation shaft will be located in Section 17, TSN, R86W on a ridge northwest of the Northwest Mains Ventilation Shaft and fan, as shown on Maps 23 and 23B. Developmenru construction, and installation of the intake ventilation shaft (Exhibit 49A, Figures EX49A- F1 through F4 and Maps EX49A-M1 through M3) involve the following sequential activities: • Completion of environmental and engineering investigations • Placement of disturbed area markers • Marking of wetland buffer zone • Temporary drainage and sediment control measures • Recovery and stockpiling of available topsoil • Installation of drainage and sediment control structures • Construction of an access road and site prepazation for shaft pad • Drilling and casing of seven (7) boreholes for: - 3 power boreholes - 1 water borehole - 1 air compressor borehole - 1 rockdust borehole - lbulk-material drop borehole • Extension of power distribution line • Construction of shaft collaz structure and temporary drilling equipment pad • Conventional blind sink excavation and casing operations • Erection of escape hoist/elevator buildings and equipment and installation offence(s) • Installation and connection of escape hoist/elevator control equipment and systems • Driving of additional entries to the south of the existing 6-North Main entries • Final clean-up and dressing of roads and site pads These activities aze briefly described in the following sections. Site-specific investigations required for design and permitting of the new ventilation shaft included a cultural resource survey of potential disturbance azeas, soil and foundation characterization asthe basis for shaft pad and access road design, and completion of a wetland/AVF survey for the shaft pad and access road. The cultural resource survey was conducted by Metcalf Archaeological Consultants, the engineering soils characterization by Northwest Colorado Consultants, and the soils/wetland/AVF survey by Habitat Management, as described in Section 2.04. MR06-210 2.05 - 45.6a 08/l5/06