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Section 2.05.3(3) <br />Mine Facilities <br />Introduction <br />This section contains a description of the proposed structures to be used in connection with or to <br />facilitate the surface coal mining and reclamation activities at the New Horizon North (NHN) <br />Mine area described in Section 2.05.3, Operation Plan: Permit Area. <br />Support Facilities <br />Buildings Proposed buildings include a 20'x60' mobile building to be used as a foreman's <br />office, four 8'x40' steel cargo containers to be used for warehousing and parts storage, a 10'x50' <br />elevated steel water tank for dust suppression and a fuel storage facility consisting of a storage <br />vessel contained inside an earthen berm that will contain the volume from the vessel plus the <br />10yr -24hr rainfall event. Other proposed structures include a 30'x64' steel equipment wash pad, <br />a 50'x50' concrete tire change pad and an equipment ready line, parking area and materials <br />storage area. All of these structure will be located at the NHN Mine facilities area. Map <br />2.05.3(3) -1 Facilities Map shows the locations of the buildings and structures. <br />Details of sizes and types of construction for all buildings are shown in Table 2.05.3(3) -1. <br />Waste Water Sewage from the proposed buildings will be disposed of through portable toilets. <br />Waste water from the equipment wash will be re- circulated and reused; however, if there is any <br />excess waste water, it will be run through a sediment trap and an oil water separator and <br />discharged to Pond NHN -001 via a natural drainage and the NHN -001 East Ditch. <br />Dewatering System Appendix 2.05.6(3) -4 contains State Engineer approved permits for three <br />dewatering wells adjacent to the initial boxcut excavation in the backfill. The wells are 85', 65' <br />and 85' deep, respectively. The dewatering system wells are initially drilled with a 6 -3/4" tri- <br />cone bit then air lift tested to determine if enough water is present to warrant installing a pump. <br />If sufficient water is present the well is reamed with an 8 -3/4" tri -cone bit and cased with <br />Schedule 40 PVC pipe. The bottom 20' screen section of the casing is mill slotted 6" PVC. The <br />entire hole is gravel packed and a pump is installed and the top 10' of the hole is filled with <br />Sakrete. Electricity for the pump or pumps is provided by a portable generator. These wells are <br />temporary. The holes will be reclaimed after they have served their purpose, the pumps <br />removed, the holes filled with granular bentonite to within 10' of surface, concreted 10' to the <br />surface and reclaimed in cycle with the surface reclamation of the pit. <br />Section 2.05.3(3) Page 1 October 2013 (TR -05) <br />E: \New Horizon \DRMS \NHN Perm it \04 Technical Revisions TR \TR -05 \Documents from Jason \2.05.3(3) Mine Facilities TR- 05.dou <br />