Laserfiche WebLink
The installation of the silencer and duck work will occur within the existing disturbed area. The overall <br />length of the silencer and duct work is approximately 34 feet, the location of the structure is shown on <br />• Figure 16 E(1). <br />Additional Support for IAP Fan Silencer (MR 02-179) <br />An additional H-bean support structure is needed to maintain the stability of the silencer. The structure <br />will be placed between the fan concrete pad and the eastern silencer support structure. The support <br />structure will be approximately 14' high and tied in at the top with a 12' H-beam. Cross bracing rods will <br />be used to tie the two H-beam supports together. The transition section of the silencer will be supported <br />by the new structure. The support structure will be bolted onto a concrete footer approximately 3.5' x 4' x <br />12'. <br />NW Mains Ventilation Shaft and Thickener Underflow Project (TR 01-39) <br />As mine development has proceeded to the north, the distance from existing mine ventilation fan <br />installations has increased to the point where an additional ventilation shaft and fan installation are <br />necessary to maintain effective ventilation of active mining areas. The new ventilation shaft and surface <br />fan installation, will be located approximately 900 feet north of Fish Creek in Section 17, TSN, R86W on <br />a low rise above the Fish Creek drainage, as shown on Maps 23 and 23B. <br />Development, construction, and installation of the ventilation shaft and fan installation involves the <br />following sequential activities: <br />• • Completion of environmental and engineering investigations <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 prepazation for shaft pad <br />• Drilling of shaft pilot hole <br />• Construction and extension of power distribution line <br />• Construction of shaft collar structure, temporary drilling equipment pad and fan foundations <br />• Shaft boring and casing operations <br />• Erection of fan enclosure and control buildings and installation offence(s) <br />• Installation and connection of fan, drive, and control equipment and systems <br />• Driving of additional entries in the Northwest Mains <br />• Final clean-up and dressing of roads and site pads <br />These activities aze 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 azeas, soil and foundation chazacterization asthe basis <br />for shaft pad and access road design, and completion of a wetland/AVF survey for the shaft access road <br />and power line crossing of Fish Creek. The cultural resource survey was conducted by Metcalf <br />Archaeological Consultants, the engineering soils characterization by Northwest Colorado Consultants, <br />and the wetland/AVF survey by Habitat Management, as described in Section 2.04. <br />MR 02-179 2.05-45 08/06/02 <br />