2010-06-04_PERMIT FILE - C1982056A (9)

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flow to the Site 114 pump by means of the existing ditches and culverts. A short temporary ditch may need to be inscribed from the PM road culvert to Site 114 in order to route the flow to the pump. When no longer required, the • overland line will be disconnected allowing the 109 discharge to again flow to Pond D, and the temporary ditch will be removed. A pumphouse was constructed at Pond A to supply water to the coal preparation plant. The pumphouse is an approximately 15 x15 foot metal building on a concrete slab. The building contains the pumps and associated controls. The water is pumped through a new 8 -inch waterline buried along the shoulder of the existing access road from the Tipple to Pond A. The waterline runs from Pond A to a new valve box at Location A. The buried waterline continues to a new valve box at Location B. The new line then continues adjacent to Haul Road B to existing Location 8 and on to new Location C. New waterlines were laid from Location C into the preparation plant and to existing Location 6. The location of the new waterlines and valve boxes are shown on Map 24, Surface Facilities. All new waterlines will be located within existing disturbed areas. Pumphouse Addition (MR06 -205) The existing pumping system delivering water from the TCC million- gallon tank to the underground operations would not meet anticipated water requirements for the new longwall. To meet increased water delivery requirements, TCC installed two 150 -HP, 480 -Volt, variable frequency drive (VFD) pumps. The dual -pump system provides peaking capacity and allows one pump to serve as a backup, under normal operational conditions. The pad for the Pumphouse is in a previously disturbed area, but required some fill placement and grading to establish a stable foundation. The pad footprint was over excavated, and suitable fill material was placed and compacted to one -foot below grade. The Pumphouse foundation is a 6 -inch thick reinforced slab with the footings extending approximately 4 feet deep. Following foundation excavation and construction, six inches of 3 / - inch gravel was placed on pad areas adjacent to the foundation slab. The foundation slab includes two reinforced • concrete piers extending approximately one -foot above the slab surface to support and isolate the pump and drive assemblies. A 20 x 17 foot insulated pre- fabricated steel building was erected adjacent to the existing Electric Shop to accommodate the two VFD pump skids and drives, a heating and ventilation system, and provide for maintenance access. Three new powerpoles and a short connector line connect the pump installation to the existing Substation No. 7. Piping from the new pumping installation connects to the three existing underground water lines (suction, pressure, and recirculation) that run adjacent to the existing Electrical Shop. Design drawings and construction specifications for the Pumphouse foundation and building are provided in Exhibit 49F, and the Pumphouse location is shown on Map 24 (Sheet 1 of 3), Surface Facilities and Freshwater Systems. As part of the mine surface facilities, the Pumphouse addition will be reclaimed in conjunction with final reclamation of the mine facilities area, as described under the sub - heading "Surface Facilities" on page 2.05 -101 of the PAP. In general, this will involve removal of the two pump and drive assemblies along with associated surface piping (existing buried piping to be stubbed -off and abandoned in place); demolition and disposal of the Pumphouse building, foundations, and powerline and poles. The pad area will be regraded to reestablish effective drainage and blend with the surrounding terrain. Stockpiled topsoil will then be replaced and seeded with a pastureland seed mixture. Washplant II Waterline and Connection (TR07 -59, Washplant 111) In order to supply adequate water to Washplant II, a new 10,000 -foot, 6 -inch HDPE waterline will be installed between Washplant H and the Area 1 Pit. A 5 -6 foot deep trench will be excavated from the Area 1 Pit to the Washplant H location, adjacent to or in the same location as the existing 4 -inch waterline. Since the trench will fall entirely within a previously disturbed area, no topsoil remains and no soil salvage will be required. Once the waterline is laid in the trench and properly bedded, the trench will be backfilled and the material compacted. An additional pump will be • placed in the Area 1 Pit and connected to the new waterline. Either a float or submersible pump will be utilized, with pump control and access from the existing pump- station access in the Area 1 Pit. In addition, a short buried 8 -inch HDPE connector line will be extended from the Washplant II water supply line to the existing 8 -inch waterline that now runs between Pond A and the existing Washplant I, to provide an alternate /supplemental water supply for Washplant H. A manhole with manual valves or automated control valves will be used to control flow to the Washplant. MR09 -238 2.05 -53 06/26/09