Laserfiche WebLink
APR. 9.2002 10~07RM TWENTYMILE COAL ENVIRONMENTRL N0.871 P.il <br />structuues) welded to the support beams, The steel straps will be welded to the existing 48" diameter casing. Once this <br />is completed a 24 inch thick reinforced concrete slab will be constructed over the previously placed slab and decking. <br />The void from on top of the concrete slab to within five feet of the surface will be backfilled with fill material <br />(approximately 1.4 ~ from the surrounding area, The next two feet of the shaft will then be filled with concrete to <br />form a top plug for the shaft. Fill material will ba placed in the remaining three feet ofthe shaft (approximately 1.4 <br />C17 and then the site will be topsoiled and revegetated. The redistributed topsail wi116e seeded with the pastureland <br />seed mixture. <br />1E1VID Ventilation Site <br />When the facilities are no longer required, they will be dismantled and removed 1mm the site. The fans, silencer, <br />supports and associated buildings will be hauled away from the she. The concrete pads, footers and piers will be <br />broken up and placed into the cased holes. The bottom fifteen feat of each hole will have a cement plug placed in it and <br />the remainder of the hole, excluding the Twentymile Sandstone and 20 feet above and below it, will be filled with inert <br />material, The top ten feet, excluding the top 3 feet that will be filled with soil, will have a cement plug placed in ix. <br />Auer the holes have been plugged and the building materials removed, the site will be regraded to blend in with the <br />surrounding topography, The topsoil will then be reapplied to the site and needed with a pastureland seed mixture, <br />Dewaterlne Borehole <br />Upon completion of mining, and when the system is no longer required, the facilities will be removed and the site <br />reclaimed. Removal of the surface facilities will involve dismantling of surface structures, which includes the <br />powerline, transformer and pad, chemical end pump control building and pad, ponds, and road. After the facilities are <br />removed, the site will be regraded to blend in with the existing topography and the stockpiled topsoil redistributed over <br />the area. The topsoil redistributed over the dewatering site and reclaimed road segmens will be seeded with the <br />pastureland seed mixture. The existing road and beginning segment Will be left in place to servo the postmining land <br />use. The topsoil windrowed or stockpiled adjacent to the road will be seeded with pastureland need mixture. <br />N1VTD Power Borehole , <br />Upgn completion of mining, and when the power borehole is no longer required, the facilities will be removed and the <br />site reclaimed. Removal of the surface facilities will involve dismantling of surface stuctures, 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 in with the existing topography and the stockpiled topsoil redistributed over the area. The topsoil <br />redistributed over the power borehole pad and reclaimed road segments will be seeded with the pastureland seed <br />mixdrre. The entire road will be chisel-plowed after removing the geotextile. <br />IVW Mains Ventilation Shaft And Thickener Underfloor Proiect(TR01~91 <br />When the IVW Mains ventilation shaft and fan installation are no longer required to support ongoing or firhrre mining <br />operations, the associated surface facilities wiU be removed, the shaft will be plugged and se4led, and surface <br />disturbance areas will be reclaimed The fan equipment, buildings, power line, and poles will be removed and reused at <br />another local, salvaged, or disposed ofoff--site. Concrete pads will be broken up cad foundations will be demolished to <br />at least 20 feat below grade, and the resulting concrete debris will be disposed of in the shaft opening, The shag collar <br />concrete will also be broken up and disposed of into the shaft opening, leaving an open space for the concrete decking, <br />concrete slab sod backfiU maDerial t4 be placed is the shaft void. Shaft plugsing and sealing will involve construction <br />and placement of a prefabricated framework of steal support beams, steel composite decking and 4" of concrete to be <br />placed at the bottom of the shaft collar (approximately 20' below grade), which will rest oa the lower shaft liner. Once <br />this is completed a 24 inch think reinforced concrete slab will be constructed over fire previously placed slab and <br />decking. The concrete in this slab will also flow down and fiU in the annular space between the C-channel and <br />surrounding strata as shown in Exhibit 268, sactioa 3/S-1. This will effectively seal the plug at the interface of the plug <br />MR 02- 178 2.05-105.1 04/08/02 <br />