2018-07-09_PERMIT FILE - C1981019A (24)

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RULE 2 PERMITS lines as a result of these activities as documented in their agreement. See Exhibit 22. Further information regarding highwall mining is presented in Rule 4.23. Haul and Access Roads The haul roads and access road utilized at the Colowyo operation are shown on the Existing Structures Maps 21, 22A, and Map 25G Sheets 1 and 2. The road gradients are 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 of this volume (Volume 1) of the original permit as well as Volume 12 of the South Taylor expansion. 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. All haul routes constructed during the permit term within the immediate mining area are exempt from any construction specifications in accordance with Rule 4.03. 1 (1)(d)(i). 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). The designs and specifications for each structure are presented in Exhibit 7, Hydrology Information and Exhibit 17, Haul Road and Facilities Modifications. All ponds, impoundments and diversions are designed to meet or exceed the requirements of 2.05.3(4) and 4.05.6. The initial phases in construction of sedimentation pond embankments has been and will be to clear all unstable material and to scarify the entire surface. In no instances was or will coal processing waste be used as an embankment. All fill material was and will be selected to exclude the presence of sod, large roots, and frozen material. The placing and spreading of fill material was and will be started at the lowest point of the foundation. All ponds, regardless of size, will be examined quarterly for structural weakness, erosion and other hazardous conditions. Maintenance procedures may include mowing or cutting excessive vegetative growth to facilitate inspections and repairs keeping ditches, culverts and spillways free of debris, and removing all combustible material other than mulch and other material required for erosion control and surface stability. Sediment will be removed from all sedimentation ponds when the volume of sediment accumulates to 60% of the design sediment storage volume or when sufficient volume is not available to treat the predicted runoff and sediment volume from a 10 - year, 24-hour storm event.. The accumulated sediment found in the ponds will be removed and placed in existing topsoil stockpiles if the sediment meets the appropriate topsoil criteria, otherwise disposed of in the pit backfill. Rule 2 Permits 2.05-10 Revision Date: 5/25/18 Revision No.: RN -07