2007-06-29_PERMIT FILE - C1981019A

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• shown on the Haul Road "A" Profile (Map 25) and Haul Road "B" Profile (Map 25A). Haul roads, access roads and light use roads are discussed in Sections 4.03.1 through 4.03.3. The hydrologic calculations for road drainage structures are shown in Exhibit 7, Hydrology Information. Haul roads as mapped have been in existence since construction in 1976 and 1977. On June 5, 1985 Colowyo requested a revision to provide for repairs and remedial action to stabilize a debris slide along the paved haul road. The Division approved the revision on June 12, 1985. For the location of the slide area refer to Map 22 -Existing Structures -South. For additional details refer to Exhibit 17 -Haul Road and Facilities Modifications. All truck routes constructed during the permit term within the immediate mining area are exempt from any construction specifications, since roadways within the immediate mining pit area are not included within the code of Colorado Regulations Definition of "road" (Rule 1.04(111)). In general, however, mining area truck routes are built with a crown, are ditched on either side, have berms of at least axle height on outside (downslope) exposures, and only exceed grades of nine percent for distances of less than 100 yards. Typical truck routes are from 75 feet to 100 feet wide, are surfaced with sized crushed rock, and are maintained with motor graders. • Ponds, Impoundments and Diversions To control runoff, and protect surface and ground water quality, Colowyo has constructed several sedimentation structures and diversion ditches. The Hydrology -North Map (Map 11) and the Hydrology -South Map (Map 12) show the locations of the sedimentation ponds and diversion structures. Most of these sedimentation ponds were constructed in 1978 and 1979 to comply with the performance standards of Subchapter B (Office of Surface Mining Interim Program Standards). 2:05-21 Revision Date: 6/28/05 Revision No.: MR-73