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Mine Facilities <br />Introduction <br />This section contains a description of the structures to be used in connection with or to facilitate <br />the surface coal mining and reclamation activities at the New Horizon North (NHN) Mine area <br />described in Section 2.05.3, Operation Plan: Permit Area. <br />Support Facilities <br />Buildings Buildings include a 20 ft. x 60 ft. mobile building to be used as a foreman's office, two <br />8 ft. x 40 ft. steel cargo containers to be used for warehousing and parts storage, a 10 ft. x 50 ft. <br />elevated steel water tank for dust suppression and a fuel storage facility consisting of as many as <br />two (2) above -ground fuel tanks used for diesel storage. Other structures include a 30 ft. x 64 ft. <br />steel equipment wash pad, a 50 ft. x 50 ft. concrete tire change pad and an equipment ready line, <br />parking area and materials storage area. All of these structures will be located at the NHN Mine <br />facilities area. Map 2.05.3(3)-1 Facilities Map shows the locations of the buildings and structures. <br />Details of sizes and types of construction are shown in Table 2.05.3(3)-1. <br />Waste Water Sewage will be disposed of through portable toilets. Waste water from the <br />equipment wash will be re -circulated and reused; however, if there is any excess waste water, it <br />will be run through a sediment trap and an oil water separator and discharged to Pond NHN-001 <br />via a natural drainage and the NHN-001 East Ditch. <br />Dewatering S. sY tem 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 ft., 65 <br />ft. and 85 ft. deep, respectively. The dewatering system wells are initially drilled with a 6-3/4 in. <br />tri -cone bit then air lift tested to determine if enough water is present to warrant installing a <br />pump. If sufficient water is present the well is reamed with an 8-3/4 in. tri -cone bit and cased <br />with Schedule 40 PVC pipe. The bottom 20 ft. screen section of the casing is mill slotted 6 in. <br />PVC. The entire hole is gravel packed and a pump is installed and the top 10 ft. of the hole is <br />filled with Sakrete. Electricity for the pump or pumps is provided by a portable generator. These <br />wells are 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 ft. of surface, concreted 10 ft. to <br />the surface and reclaimed in cycle with the surface reclamation of the pit. <br />Section 2.05.3(3) Page 1 Sept. 2015 (TR -11) <br />