2018-10-11_PERMIT FILE - C1982056A

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water to the surface facilities. A second centrifugal pump delivers water to the mine for dust control and fire protection. A second source is a water -line, which runs from a Colorado Yampa Coal Company manhole station 220 feet to a borehole approximately 170 feet deep, constructed of 4- inch PCV pipe, as shown on Map 24, Surface Facilities. This line will provide water to the TC/CYCC water system. TC proposes to install an additional waterline between CYCC and TC. The line will be installed between CYCC's wash bay and TCC's pumphouse. The approximate location of the water line is shown on Map 24, Surface Facilities. A 40 -foot corridor will be disturbed during installation. TC is adding an 8 -inch HDPE, 400 -foot long waterline between Location 6 Inspection manhole and the freshwater borehole. A 40 -foot corridor will be disturbed during installation. Mine Water Discharge and Recycle System (Revised - TR09-70, TR10-73, MR07-216, MR08-230, MR08-231, MR15-288, MR16-295, MR16-299) Transfer of mine water to the surface can occur at six locations, the Portal/0-Entry Borehole/Pond D (Sites 109 (inactive)/005), the Fish Creek Boreholes (Site 115), the TORT Boreholes (Site 001 under the General Coal Permit), the 18 -Left Shaft Site (connects to Fish Creek Pipeline), and the 19 -Right Borehole and 5MN Boreholes (both connect to 6MN Mine Water Reservoir). Water discharged from the Portal and 0 -Entry Borehole (general mine discharge) is routed through the Area 1 Pit Mine Water Storage Reservoir, with discharge to Sedimentation Pond D prior to discharging to Foidel Creek at Site 005. Mine discharge water from the Fish Creek Boreholes (SWMD) may be treated prior to transfer to the mine water system or discharge to Fish Creek at Site 115, or may be pumped back to the Area 1 Pit for use in the Washplant or discharge through Pond D and Site 005. A treatment system for the l ORT (EMD) Dewatering Boreholes has not been constructed to date, although TCC may install a temporary mobile treatment system. The water can be pumped from this site directly to the mine water system, to the 6MN Mine Water Storage Reservoir and 6MN Million -Gallon Tank (connected to the mine water system), back to the Area 1 Pit for use in the Washplant or discharge through Pond D and Site 005, or directly discharged to Foidel Creek at Site 001, under the Coal General Permit. Mine water can also be transferred from the 18 -Left Shaft Site to the existing pipeline running from the Fish Creek Water Treatment Facility to the Area 1 Pit. From The Area 1 Pit, this water can then be transferred to any of the storage or use points previously identified. Mine water from the 19 -Right Dewatering Borehole and 5MN Borehole is transferred to the 6MN Mine Water Storage Reservoir, where it can be routed back to the mine water system through the 6MN water borehole. With future approvals and modifications, water from the 5MN Borehole could be routed through a planned passive treatment system for re -use or discharge from the 6MN Reservoir. In addition to the primary mine water discharge locations, there is a very limited potential for production mine water to discharge at the Northwest Mains Ventilation Shaft through a pressure relief/accumulator pipe for the production mine water system. Although discharge occurred in mid -2005 due to catastrophic failure of both the primary and back-up pressure relief valves, TCC has taken positive steps to assure that this site will not discharge in the future. TC previously constructed a mine water pipeline from the Fish Creek Water Treatment Facility that ties into the Barricade Chamber/FCM-2 Boreholes and the mainlORT Water Transfer Pipeline and has more recently constructed additional pipelines tying these facilities to the 6MN Mine Water Storage Reservoir and Million - Gallon Tank and the Area 1 Pit Storage Reservoir. In order to dewater the recently completed Northern Mining District and the new Western Mining District, TC has, or proposes to complete additional pipelines from the 19 - Right Mine Dewatering Borehole, the 18 -Left Ventilation Shaft Installation, and most recently, a proposed secondary IORT Water Transfer Pipeline parallel to the existing IORT to the Barricade Chamber pipeline. The locations of these pipelines and associated facilities are shown on Map 24, Surface Facilities. The water pipeline network enhances TC's ability move either treated or untreated mine water between mine areas and the ability to recycle mine water, thereby minimizing the volume of supplemental supply water needed to meet mine usage. Portal and 0 -Entry Borehole and Transfer Pipeline (MR08-230, MR08-231) — Water from the mine water system can be discharged from the Mine Portal, where it flows by gravity or can be conveyed by temporary pipeline to Ditch D-2 and the Portal Sump. A transfer pump in the Portal Sump moves the water through a buried HDPE transfer pipeline to the Area 1 Pit Mine Water Storage Reservoir. Water can also be transferred from the mine water system to the Area 1 Pit through the 0 -Entry Borehole and pipeline. The 0 -Entry Borehole is a 12 - inch (maximum) diameter steel -cased borehole extending from the 0 -Entry Fan Pad (location shown on the MR16-299 2.05-50 06/14/16