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ditch and drainage structures. Active use areas will be graveled to control dust and drainage, other <br />disturbed azeas (including topsoil stockpiles) will be stabilized with temporary vegetation, and any <br />structures will be painted in neutral earth-tone colors to blend with the natural surroundings. <br />As shown on Map 23, additional entries will be driven at the back of the 18-Right gate road to the east to <br />connect with the ventilation shaft. These entries will be needed to maximize the efficiency of the <br />ventilation system. The entries will be driven in the same manner as is used in TCC's development work, <br />i.e. continuous miners and shuttle cars. <br />6-North Mains Utility Borholes (MROS-1981 <br />An additional intake ventilation shaft is necessary to maintain effective ventilation of active mining areas <br />in the northwest mining district and future west mining district. The new ventilation shaft will be located <br />in Section 17, TSN, R86W on a ridge northwest of the Northwest Mains Ventilation Shafr and fan, as <br />shown on Maps 23 and 23B. Prior to construction of the ventilation shaft and associated facilities, TCC <br />plans to complete five utility boreholes within the proposed ventilation facilities pad area. The locations <br />for the five boreholes for project utility components are shown on Maps EX16E-M1 and M2. <br />Development, construction, and installation of the utility boreholes will (Exhibit 49A, Figures EX49A-F1 <br />through F4 and Maps EX49A-M1 through M3) involve the following sequential activities: <br />• Completion of environmental and engineering investigations <br />• Placement of disturbed area markers <br />• Marking of wetland buffer zone <br />Temporary drainage and sediment control measures <br />• Recovery and stockpiling of available topsoil <br />• Drilling and casing of five (5) boreholes for: <br />- 3 power boreholes <br />- 1 water borehole <br />- lbulk-material drop borehole <br />• Extension of power distribution line <br />• Final clean-up and dressing of roads and site pads <br />These activities are briefly described in the following sections. <br />Site-specific investigations required for design and permitting of the new ventilation shaft included a <br />cultural resource survey of potential disturbance areas, soil and foundation characterization as the basis for <br />shaft pad and access road design, and completion of a wetland/AVF survey for the shafr pad. The cultural <br />resource survey was conducted by Metcalf Archaeological Consultants, the engineering soils <br />characterization by Northwest Colorado Consultants, and the soils/wetland/AVF survey by Habitat <br />Management, as described in Section 2.04. <br />MROS-198 2.05-45.6a 08/29/05 <br />