2008-01-11_PERMIT FILE - C1982056A ‎(2)‎

• Permit No: C1982056A
• IBM Index Class Name: Permit File
• Doc Date: 1/11/2008
• Doc Name: Pages 2.05-1 to 2.05-64
• Section_Exhibit Name: 2.05 Operation and Reclamation Plans
• Media Type: D
• Archive: Yes

The installation of the silencer and duct work will occur within the existing distwbed azea. The overall length of
. the silencer and duct work is approximately 34 feet, the location of the structure is shown on Figure 16 E(1).
Additional Support for IAP Fan Silencer (MR 02-1791
An additional H-beam support structure is needed to maintain the stability of the silencer. The structure
will be placed between the fan concrete pad and the eastern silencer support structure. The support
structure will be approximately 14' high and tied in at the top with a 12' H-beam. Cross-bracing rods will
be used to tie the two H-beam supports together. The transition section of the silencer will be supported
by the new structure. The support structure will be bolted onto a concrete footer approximately 3.5' x 4'
x 12'.
NW Mains Ventilation Shaft and Thickener Underflow Project (TR 01-391
As mine development has proceeded to the north, the distance from existing mine ventilation fan
installations has increased to the point where an additional ventilation shaft and fan installation are
necessary to maintain effective ventilation of active mining areas. The new ventilation shaft and surface
fan installation, will be located approximately 900 feet north of Fish Creek in Section 17, TSN, R86W on
a low rise above the Fish Creek drainage, as shown on Maps 23 and 23B.
Development, construction, and installation of the ventilation shaft and fan installation involves the
following sequential activities:
• Completion of environmental and engineering investigations
• 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 shag pad
• Drilling of shaft.pilot hole, grout holes (if required), and utility boreholes
• Construction and extension of power distribution line
• Construction of shag collar structure, temporary drilling equipment pad, and fan foundations
• Shaft boring and casing operations
• Erection of fan enclosure and control buildings and installation of fence(s)
• Installation and connection of fan, drive, and control equipment and systems
• Driving of additional entries in the Northwest Mains
• 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 areas, soil and foundation characterization asthe basis
for shaft pad and access road design, and completion of a wetland/AVF survey for the shaft access road
and power line crossing of Fish Creek. The cultural resource survey was conducted by Metcalf
Archaeological Consultants, the engineering soils characterization by Northwest Colorado Consultants,
and the wetland/AVF survey by Habitat Management, as described in Section 2.04.
The proposed shaft pad area is approximately 280 feet square (1.8 acres) and the associated access road
corridor is approximately 3,800 feet long with a finished top width of 22 feet (road corridor 30 feet wide).
See Exhibit 25 S, NW Mains Ventilation Shaft Access Road Design, for details on the road.
Approximately 2,000 feet of the access road crosses upland areas, with the remaining 1,800 feet crossing
lowland areas where road construction will involve removal of any large vegetation and placement of
MROS-194 2.05-45 07/2/05