2022-10-17_PERMIT FILE - C1981019A (29)

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RULE 2 PERMITS Collom – Rule 2, Page 73 Revision Date: 4/28/22 Revision No.: TR-154 mining. Colowyo is the surface landowner that the power line will be routed upon, and for ground disturbances related to WREA’s 69 kV power line to the Collom facilties area please see Volume 1 Section 4.12. Electrical power lines located in the permit area will be constructed in accordance with requirement of Section 4.18 to minimize potential electrical hazards to large raptors. The major pieces of equipment that will be powered by electricity in the Collom area are shovel(s) and dragline(s). Therefore, during the life of the mine it is necessary to periodically move the existing power line loop to accommodate the advancement of the pit. Temporary Facitilities Area (Jubb Creek) During the construction of the primary sediment control structures, Collom haul road and the main Collom facilities area described above, a temporary facitlies area was constructed at the Jubb Creek entrance directly off of Moffat County Road 32. This temporary facilties area contained temporary trailers for construction management and a laydown yard for incoming supplies and materials that was utilized during construction of the Collom haul road, sediment ponds, and main facilties area. The area is now used by the highwall mining contractor and provides a location for their tempraory offices to support ongoing highwall mining in the Collom Pit. Any trailer or building int his location is temporary in nature, is not owned or leased by Colowyo, and once this area is no longer necessary to support highwall mning activites the trailers will be removed from the site and reclamation will commence in accordance with Section 2.05.4(1). The sediment control plan for this area can be found in Exhibit 7, Item 23, Part K. Haul and Access Roads A haul road was constructed to facilitate mine traffic from the Collom primary crusher to the Gossard load out facility located northeast of the Collom Pit. This approximate 6-mile long haul road was constructed to meet the specifications and standards set forth in Rule 4.03.1 (See Map 25E, Sheets 1-4). The haul road was constructed with a crown, and constructed upon the most stable available slope to minimize erosion. An elevated haul road crossing was installed at Moffat County Road 51 at the request of Moffat County (See Map 25F). This elevated crossing ensures the general public traffic is separated from the mine haul road traffic, and takes Moffat County Road 51 over the top of the Collom Haul Road. An equipment crossing adjacent to the elevated crossing will allow large equipment movement from the Collom mine to the existing operations (See Map 25F). Overall grade of the Collom Haul Road does not exceed 10H:1V with a horizontal alignment consistent with the existing topography. Ditches, erosion controls, and culverts are used to minimize impacts to surrounding areas, and all culverts are designed to safely pass peak runoff from a 10 year, 24 hour precipitation event (Please see Volume 18C Exhibit 7, Item 25F). The Collom Haul Road has constructed to meet the applicable haul road regulations as well as internal road design guidelines while minimizing additional disturbed area and preventing environmental damage. The as-built configuration can be found on Map 25E Sheets 1 through 4. The Collom Haul Road has an overall width of approximately 100 feet, with a 28-foot asphalt-running surface as shown on (Map 25E Sheet 1). Asphalt pavement specifications were based on a 30 year design life with an 18” thick base course (gravel) and 7.0” asphalt thickness. The asphalt installed will support a 50 ton coal haul trucks with axle loads of about 81 psi. Cut slopes have been completed at 0.25H: 1V or less when completed in competent rock. Elsewhere, cut slopes in unconsolidated materials were typically laid back at 2H:1V; however some