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

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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 TCC /CYCC water system. TCC proposes to install an additional waterline between CYCC and TCC. 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. TCC 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 - MR07 -216, MR08 -230, MR08 -231, TR09 -70) Transfer of mine water to the surface can occur at four locations, the Portal/0 -Entry Borehole/Pond D (Sites 109 (inactive) /005), the Fish Creek Boreholes (Site 115), the l ORT Boreholes (Site 001 under the General Coal Permit), and at the 18 -Left Shaft Site. 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 TORT (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 runnin 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. 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. TCC previously constructed a mine water pipeline from the Fish Creek Water Treatment Facility that ties into the Barricade Chamber/FCM -2 Boreholes and IORT Water Transfer Pipeline, and proposes to construct additional pipelines tying these facilities to the 6MN Mine Water Storage Reservoir and Million - Gallon Tank and the Area 1 Pit Storage Reservoir. The locations of these pipelines and associated facilities are shown on Map 24, Surface Facilities. The water pipeline network enhances TCC'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 Surface Facilities and Fresh -Water Systems Map, (Map 24, Sheet 1 of 3)) to a depth of approximately 100 feet, where it daylights in the 0 -Entry of the underground mine workings. Because they are in previously disturbed areas, the 0- • Entry Borehole and pipeline will not require soil material salvage or modification of the existing drainage and sediment control system. The borehole will be completed as a 16 -inch (maximum) diameter drillhole using conventional drilling techniques, with air or air /foam as the circulating medium. Using air or air /foam, and because the hole is so shallow, mud pits will not be required. A 12 -inch (maximum) diameter steel casing will be placed TR09 -70 2.05 -50 APPR(?yED 17r () c, 11/16/09