2008-10-03_PERMIT FILE - C1982056A (4)

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The Fish Creek Borehole Area will be used for discharging mine water. Facilities to be constructed at the Fish Creek Borehole Area are shown on the following maps: Map 26, Fish Creek Borehole Area Facilities and Access Road; Map 27, Fish Creek Borehole Area Access Road Profile; Map 28, Fish Creek Borehole Area Access Road • Profile and Typical Cross Sections; and Map 32, Fish Creek Borehole Settling Pond Plan View and Cross-Sections. The mine water discharge boreholes will be required in 1989. Total disturbed area required for the above facilities would be less than 10 acres. Access to the sites would be as shown on Map 29, Reclamation. Standard maintenance procedures such as preventive maintenance programs, painting, and lubrication shall be utilized throughout the life of all structures. All facilities will be removed affected areas reclaimed to their original use on completion of mining activities, except to the extent alternative postmining land uses are approved. EASTERN AND NORTHERN MINING DISTRICTS Mining in the Eastern and Northern Mining Districts required the installation of a new dewatering facility and three fans. One of the fans was installed in the 0-Entry, approximately 600-800 feet in-by the portal mouth (MR94-107). The location of this fan places it within the current Surface Facilities area, therefore, no new disturbance was associated with the installation of this fan. The approximate location of the fan is on the bench between the Stoker Coal Storage area and the Materials Storage area. This fan is of similar size and capacity as the existing main mine fan. The location of the fan is shown on Map 23. Two additional fans were installed in 1996-1997. The locations of the fans are shown on Maps 17A, 18A, and 23. The fans were installed at the end of the 9-Right Panel, and are used to augment the main mine fans. Installation of the fans required construction of an access road into the site, establishment of a construction site, establishment of a topsoil stockpile, running a powerline to the site, and construction of a diversion ditch upslope of the construction site. Approximately 2 acres were disturbed in conjunction with upgrades to, and extension of, the road and construction of the fan site. A new dewatering facility was constructed in 1995-1996 at the location shown on Maps 17A, 18A, and 23. The facility is located above the lowest point in the Eastern Mining District.. The facility currently consists of an access road, dewatering well, and powerline, although the permitted facilities for this site also include a water line leading to settling ponds, two settling ponds, an aeration channel, control building, and discharge point. At the present time, flows from the dewatering borehole are piped by the Mine Water Return Line back to the Mine. As permitted, the flow from the pond would be pumped from the settling ponds to Foidel Creek in a buried line. At such time as the settling ponds and discharge point are established, a discharge permit application will be filed with the Colorado Department of Health and Environment to allow discharge from this facility. As permitted, this facility would be similar to the Fish Creek dewatering borehole system except that only one dewatering well will be constructed. Approximately 3.4 acres would be disturbed under a full construction scenario for construction of this facility and its associated access road. Mine Water Return Line and 6MN Mine Water Storage Reservoir Feed Line (TR07-61) A water line was installed from the EMD dewatering facility to FCM-2 to route water back into the mine for underground operations. The location of this water line is shown on Figure 16I, 1996 Seismic Lines and Mine Water Discharge Return Line, East Mine District. Approximately 7,300 feet of 8-inch HDPE pipe was buried at 5 to 6 feet below grade from the dewatering facility to FCM-2. This pipe will be left in place when no longer required. As part of the 6MN Storage Reservoir project, TCC will establish a new pipeline running approximately 6,000 feet from the 10-Right Dewatering pipeline to the 6MN Storage Reservoir. The pipeline will be constructed of 10-inch HDPE pipe, buried to a depth of approximately six feet, with one sub-grade crossing (bored under) of Fish Creek. Details on the Fish Creek pipeline crossing are presented in Exhibit 490, 6MN Mine Water Storage. Reservoir - ~esign Drawings. Pipeline trenching operations will be conducted using atrack-hoe with the maximum working TR07-61 2.05-55 .07/14/07