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RULE 2 PERMITS <br />Along the western limits of the west pit operations, highwall mining activities will be conducted under the <br />existing Tri-State power lines. Colowyo will be responsible for impacts to the power lines as a result of <br />these activities as documented in their agreement. See Exhibit 22. Further information regarding <br />highwall mining is presented in Rule 4.23. <br />Haul and Access Roads <br />The haul roads and access road utilized at the Colowyo operation are shown on the Existing Structures <br />Maps 21, 22A, and Map 25G Sheets 1 and 2. The road gradients are shown on the Haul Road "A" Profile <br />(Map 25) and Haul Road "B" Profile (Map 25A). Haul roads, access roads and light use roads are <br />discussed in Sections 4.03.1 through 4.03.3 of this volume (Volume 1) of the original permit as well as <br />Volume 12 of the South Taylor expansion. <br />The hydrologic calculations for road drainage structures are shown in Exhibit 7, Hydrology Information. <br />Haul roads as mapped have been in existence since construction in 1976 and 1977. <br />On June 5, 1985 Colowyo requested a revision to provide for repairs and remedial action to stabilize a <br />debris slide along the paved haul road. The Division approved the revision on June 12, 1985. For the <br />location of the slide area refer to Map 22 - Existing Structures - South. For additional details refer to <br />Exhibit 17 - Haul Road and Facilities Modifications. <br />All truck routes constructed during the permit term within the immediate mining area are exempt from <br />any construction specifications, since roadways within the immediate mining pit area are not included <br />within the code of Colorado Regulations Definition of "road" (Rule 1.04(111)). <br />In general, however, mining area truck routes are built with a crown, are ditched on either side, have <br />berms of at least axle height on outside (downslope) exposures, and only exceed grades of nine percent <br />for distances of less than 100 yards. Typical truck routes are from 75 feet to 100 feet wide, are surfaced <br />with sized crushed rock, and are maintained with motor graders. <br />Ponds. Impoundments and Diversions <br />To control runoff, and protect surface and ground water quality, Colowyo has constructed several <br />sedimentation structures and diversion ditches. The Hydrology - North Map (Map 11) and the Hydrology <br />- South Map (Map 12) show the locations of the sedimentation ponds and diversion structures. Most of <br />these sedimentation ponds were constructed in 1978 and 1979 to comply with the performance standards <br />of Subchapter B (Office of Surface Mining Interim Program Standards). The designs and specifications <br />for each structure are presented in Exhibit 7, Hydrology Information and Exhibit 17, Haul Road and <br />Facilities Modifications. All ponds, impoundments and diversions are designed to meet or exceed the <br />requirements of 2.05.3(4) and 4.05.6. <br />The initial phases in construction of sedimentation pond embankments has been and will be to clear all <br />unstable material and to scarify the entire surface. In no instances was or will coal processing waste be <br />used as an embankment. All fill material was and will be selected to exclude the presence of sod, large <br />roots, and frozen material. The placing and spreading of fill material was and will be started at the lowest <br />point of the foundation. <br />All ponds, regardless of size, will be examined quarterly for structural weakness, erosion and other <br />hazardous conditions. Maintenance procedures may include mowing or cutting excessive vegetative <br />growth to facilitate inspections and repairs keeping ditches, culverts and spillways free of debris, and <br />Rule 2 Permits 2.05-9 Revision Date: 1/31/18 <br />Revision No.: TR -119 <br />