2009-04-29_PERMIT FILE - C1982056A (8)

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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 an existing Colorado Yampa Coal Company manhole, 220 feet to a • borehole approximately 170 feet deep, constructed of 4- inch PCV pipe, as shown on Map 24, Surface l~acilities. This line will provides 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 washbay 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 the Location 6 Inspection manhole and the freshwater borehole. Mine Water Discharge and Recycle System (Revised - MR07-216 MR08-230 MR08 2311 Discharge of mine water can occur at three locations, the Mine Portals/0-Entry Borehole/Pond D (Sites 109 (inactive)/005), the Fish Creek Dewatering/Treatment facilities (Site 115), and the TORT Dewatering Wells (Site 001 under the General Coal Permit). Water discharged from the Mine 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 from the Fish Creek Dewatering Wells (SWMD) may be treated prior to transfer to the mine water system or discharge to Fish Creek at Site 115. Treated water from the Fish Creek Dewatering facility may be pumped to the Barricade Chamber/FCM-2, the l ORT/6MN Transfer Pipeline and the 6MN Mine Water Storage Reservoir/Million-Gallon Tank, or the Area 1 Pit Mine Water Storage Reservoir for transfer to the mine water system, use in the Washplant, or discharge through Pond D and Site 005. A treatment system for the TORT (EMD) Dewatering Wells 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 Mine Water Storage Reservoir 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. • 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/accumulatorpfpe 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 the Fish Creek/Barricade Chamber Transfer Pipeline from the Fish Creek Water Treatment Facility to the Barricade Chamber/FCM-2 Borehole, and proposes to construct additional pipelines tying these facilities and the lORT Dewatering Wells 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, and Map 16, Mine Water Handling. 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 Transfer 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 MR08-231 2.05-50 11/20/08