Laserfiche WebLink
A pumphouse will be constructed at Pond A to supply water to the coal preparation plant. The pumphouse will be an <br />approximately l5"x15" metal building built on a concrete slab. The building will contain the pumps and the associated <br />controls. The water will be pumped through a new 8 inch waterline to be buried along the shoulder of the existing <br />access road from the Tipple to Pond A. The waterline will run from Pond A to a new valve box at Location A. The <br />buried waterline will continue to a new valve box at Location B. The new line will then continue adjacent to Haul <br />Road B to existing Location 8 and will continue on to new Location C. New waterlines will be laid from Location C <br />into the preparation plant and to existing Location 6. The location of the new waterlines and valve boxes are shown on <br />Map 24, Surface Facilities. All new waterlines will be located within existing disturbed areas. <br />Pumahouse Addition (MIt06-2051 <br />The existing pumping system delivering water from the TCC million-gallon tank to the underground operations <br />would not meet anticipated water requivements for the new longwall. To meet increased water delivery <br />requirements, TCC installed two 150-HP, 480-Volt, variable frequency drive (VFD) pumps. The dual-pump <br />system provides peaking capacity and allows one pump to serve as a backup, under normal operation conditions. <br />The pad for the Pumphouse is in a previously disturbed area, but required some fill placement and grading to <br />establish a stable foundation. The pad footprint was over-excavated, and suitable fill material was placed and <br />compacted to one-foot below grade. The Pumphouse foundation is a 6-inch thick reinforced slab with the footings <br />extending approximately 4 feet deep. Following foundation excavation and construction, six inches of/a-inch <br />gravel was placed on pad areas adjacent to the foundation slab. The foundation slab includes two reinforced <br />concrete piers extending approximately one-foot above the slab surface to support and isolate the pump and drive <br />assemblies. A 20 x 17 foot insulated pre-fabricated steel building was erected adjacent to the existing Electric Shop <br />to accommodate the two VFD pump skids and drives, a heating and ventilation system, and provide for <br />maintenance access. Three new power-poles and a short connector line connect the pump installation to the <br />existing Substation No. 7. Piping from the new pumping installation connects to the three existing underground <br />water lines (suction, pressure, and recirculation) that run adjacent to the existing Electrical Shop. Design drawings <br />and construction specifications for the Pumphouse foundation and building aze provided in Exhibit 49F, and the <br />Pumphouse location is shown on Map 24 (Sheet t of 3), Surface Facilities and Freshwater Systems. <br />As part of the mine surface facilities, the Pumphouse addition will be reclaimed in conjunction with final <br />reclamation of the mine facilities area, as described under the sub-heading "Surface Facilities" on page 2.05-101 of <br />the PAP. In general, this will involve removal of the two pump and drive assemblies along with associated surface <br />piping (existing buried piping to be stubbed-off and abandoned in place); demolition and disposal of the <br />Pumphouse building, foundations, and powerline and poles. The pad area will be regraded to reestablish effective <br />drainage and blend with the surrounding terrain. Stockpiled topsoil will then be replaced and seeded with a <br />pastureland seed mixture. <br />Rockdust Distribution <br />A rockdust tank located north of the portal area, as shown on Map 24, Surface Facilities and Freshwater Systems, <br />supplies rockdust to the underground mine (see Figure 16, Rockdust Bin Operations Design). The tank pad and <br />associated wck access/unloading area is surfaced with pit-run gravel to control drainage and erosion. A borehole <br />measuring 12.25 inches in diameter drilled to the underground workings supplies rockdust, and power for the Tank <br />Feeder Drive and Top Blower. The pipes inserted in the borehole for these purposes include a 6 5/8-inch O.D. pipe and <br />a 2 3/8-inch O.D. pipe, respectively. The remaining open volume around the pipes is filled with grout. The pad for the <br />bin consists of a solid one-foot thick footer and four concrete pillars. The total concrete volume is approximately 11 <br />cubic yazds. <br />Surface Facilities <br />The Foidel Creek Mine portal area is located in a partially backfilled final cut. This excavation was filled to an <br />elevation of 6,860 feet and leveled. Before fill materials were placed in the pit, aloes-permeability bartier was <br />MR06-205 2.05-53 Revised- February 1, 2006 <br />