2009-03-09_PERMIT FILE - C1982056A (3)

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5. Light-Use Roads to Powerline Substation and Subsidence Monitoring Site A light-use road and a permanent road will be used to access the substation. The light-use road will run 4,800 feet to the substation and will follow the existing "fence" road. The light-use road will be designed per the requirements of Rule 4.03.3, Light-Use Roads. The light-use road will be sufficiently maintained in order to assure erosion control. Surfacing of the road will be adequate for the general use of the road, and will be compatible with winter and spring, snow removal requirements. Access to the light-use road and substation will also require the utilization of a permanent road approved by the CMLRD on February 3, 1988 (Technical Revision TR87-12; Permit C-81-071). This permanent road runs 12,000 feet from Country Road #27 and is maintained under CYCC's Permit C-81-071. The roads will be maintained by TCC. Upon substation removal, the light-use road will remain as part of the approved postmining use of ranch management. The light-use and permanent road are shown on Map 39, Substation and Powerline Location. A light-use road will be used to access a subsidence borehole meter at Mine 2 (MR89-37). The road will be reclaimed on completion of the subsidence borehole metering. 6. Light-Use Road to 6MN Mine Water Storage Reservoir A light-use road will access the 6MN Mine Water Storage Reservoir, for inspection and maintenance purposes. The light-use road will run approximately 130 feet from the existing 6MN Ventilation Shag Installation access road. The light-use road is designed per the requirements of Rule 4.03.3, Light-Use Roads, will be approximately 20 feet wide, with an overall grade of 0.7 percent, and is designed with a 6-inch compacted road-base base course, and 3-inch gravel surfacing. The location of the road, and road configuration and cross-section, are shown on the design drawings included in Exhibit 490. The light-use road will be maintained on a periodic basis to assure its suitability for use and effective erosion control. Surfacing of the road will be adequate for the general use of the road, and will be compatible with winter and spring, snow removal requirements. At such time as the 6MN Reservoir is no longer needed, the light-use road will be removed and the associated disturbance area reclaimed. 7. Other Light-Use Roads In addition to the above light-use roads, a number of other roads of this classification are located around the property. The other roads include the following: Low Quality Coal Stockpile Road, West Gate Road, Fish Creek Borehole Road, Escape Shaft/Borehole Site Road, EMD Dewatering Borehole Road, Lieske Substation Road, and MET Station Road. All of these roads are shown on Map 24A and have been designed and constructed in conformance with Rule 4.03.3. General No bridges are planned with this permit revision application. All culverts with an end area of less than 35 square feet will be designed to pass, at a minimum, the 10-year, 24-hour event. Should a culvert with an end area greater than 35 square feet be needed, it will be designed to safety pass the 20-year, 24-hour event. The culverts have also been designed and constructed to sustain the vertical soil pressure, the passive resistance, and the weight of the vehicles using the road. Trash racks and debris basins will be installed where needed to avoid plugging, collapse, and erosion at culvert inlets and outlets. Culverts for road surface drainage were installed as specified in Rule 4.03.2(4)(e)(v). These culverts cross the road at not less than a 30-degree angle, and will be protected at the inlet and outlet by rock riprap, if required. The culverts are covered by compacted fill to a depth of at least 1 foot. No natural drainage channels will be altered with this permit revision application. All natural drainage channels will be crossed using culverts of adequate size, so as not to affect the normal flow or gradient of the stream. Drainage from the access/haulroad will meet the requirements of Rule 4.05. The roads have been constructed and will be maintained to minimize erosion. The water-control systems have been designed to safely pass, at a minimum, the peak runoff from a 10-year, 24-hour precipitation event. MR09-236 2.05-74.2 02/23/09