|
The existing road and beginning segment will be left in place to serve the postmining land use. The topsoil windrowed
<br />or stockpiled adjacent to the road will be seeded with the pastureland seed mixture.
<br />NMD Power Borehole
<br />Upon completion of mining, and when the power borehole is no longer needed, the facilities will be removed and the
<br />site reclaimed. Removal of the surface facilities will involve dismantling of surface structures, which includes the
<br />powerline, transformer and pad, road and culvert, and building. After the facilities are removed, the site will be
<br />regraded to blend with the existing terrain, the stockpiled topsoil will be redistributed over the area, and the power
<br />borehole pad and reclaimed road segments will be seeded with the pastureland seed mixture. The entire road will be
<br />chisel - plowed after removing the geotextile.
<br />NW -Mains Ventilation Shaft and Thickener Underflow Project (TR01 -39)
<br />When the NW -Mains ventilation shaft and fan installation are no longer needed to support ongoing or future mining
<br />operations, the associated surface facilities will be removed, the shaft will be plugged and sealed, and surface
<br />disturbance areas will be reclaimed. The fan equipment, buildings, powerline, and poles will be removed and reused at
<br />another location, salvaged, or disposed of off -site. Concrete pads will be broken -up and foundations will be
<br />demolished to at least 4 feet below grade, and the resulting concrete debris will be disposed of in the shaft opening.
<br />The shaft collar concrete will also be broken up and disposed of in the shaft opening, leaving an open space for the
<br />concrete decking, concrete slab and backfill material to be placed in the shaft void. Shaft plugging and sealing will
<br />involve construction and placement of a pre- fabricated framework of steel support beams, steel composite decking and
<br />4 inches of concrete to be placed at the bottom of the shaft collar (approximately 20 feet below grade), which will rest
<br />on the lower shaft liner. Once this is completed, a 24 -inch thick reinforced concrete slab will be constructed over the
<br />previously placed slab and decking. The concrete in this slab will also flow down and fill -in the annular space between
<br />the C- channel and surrounding strata as shown in Exhibit 26B, Section 3 /S -1. This will effectively seal the plug at the
<br />interface of the plug and lower shaft liner. Also, tie -ins will be placed around the periphery of the 24 -inch slab to allow
<br />for tying -in the rebar of the reinforced concrete slab. After this slab has cured, backfill material will be placed in the
<br />void. The backfill material will be placed to within 6 inches of the surface, and the final 6 inches will be filled with
<br />topsoil. The plug drawing is presented in Exhibit 26B, NW -Mains Ventilation Shaft Plug.
<br />Following removal of structures and equipment and plugging and sealing of the shaft; road surfacing materials and
<br />culverts will be removed and disposed of off -site; and the shaft pad and access road disturbance areas will be regraded
<br />to reestablish effective drainage and blend with the surrounding terrain. Stockpiled and windrowed topsoil will then be
<br />replaced on those disturbed areas where it was previously removed, and the areas will be seeded with a pastureland
<br />seed mixture.
<br />In reference to the thickener underflow project, the reclamation work will involve removal of the pump, hosing and
<br />piping, pump platform, support beams, powerline and poles, transformer, concrete pad, and grounding bed. The pump
<br />will be removed from the pit, along with salvageable components, and then the remainder of the platform and support
<br />beams will be dozed into the pit. The powerline and poles and transformer will be salvaged and the concrete pad will
<br />be dozed into the pit. The grounding bed will be disconnected and left in -place and covered during the backfilling and
<br />grading of the surrounding area. The area then will be topsoiled and seeded in conjunction with the reclamation of the
<br />entire portal /facilities area.
<br />18 -Right Ventilation Shaft (TR04 -44, TR05 -50, MR04 -190, MR05 -200, MR07 -225))
<br />When the 18 -Right Ventilation Shaft, emergency hoist equipment, and shaft heater are no longer required to support
<br />ongoing or future mining operations, the associated surface facilities will be removed, the shaft will be plugged and
<br />sealed, and surface disturbance areas will be reclaimed. The emergency hoist equipment and shaft heater will be
<br />removed and reused at another location, salvaged, or disposed of off -site. Concrete pads will be broken up and
<br />foundations will be demolished to at least 2 feet below grade, and the resulting concrete debris will be disposed of in
<br />the shaft opening. The shaft collar concrete will also be broken up and disposed of into the shaft opening, leaving an
<br />open space for the concrete slab and backfill material /shaft cuttings to be placed in the shaft void. A cement plug shall
<br />be placed in the bottom 15 feet of the shaft and the remainder of the shaft will be filled with inert material including the
<br />MR07 -225
<br />2.05 — 105.1 11/13/07
<br />
|