2021-09-03_PERMIT FILE - C1981019A (8)

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RULE 2 PERMITS Collom – Rule 2, Page 74 Revision Date: 6/16/21 Revision No.: TR-149 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 areas are steeper or shallower based on field conditions encountered during construction (please see Map 25E Sheet 3). There are two main haul roads that will be built to haul overburden materials from the pit to the temporary overburden stockpile. These are shown on Map 25D and are designated as the East and West Haul Roads. Please see section 4.03.1 for details pertaining to these two haul roads and haul roads that will be constructed within the mining area. Several access roads have been constructed to support mining operations at the Collom mine. Two access roads were constructed to the Section 25 and 26 sediment ponds, an access road was constructed to access the Collom Haul Road from the Jubb Creek entrance off of Moffat County Road 32, and several temporary access roads were established to support intial mining operations. The locations and as-built configurations for these access roads are provided in Volume 18B, Exhibit 7-23, Part D, Figures D1 through Figure D4. 2.05.3 (4) Operation Plan – Ponds, Impoundments, and Diversions To control runoff, and protect surface and ground water quality, Colowyo will construct several new sedimentation structures and diversion ditches. All ponds, impoundments, and diversions are designed to meet or exceed the requirements of 2.05.3(4) and 4.05.6. All sediment ponds will be constructed and maintained in accordance with the parameters mentioned in Volume 1, Section 2.05. Impoundments will be inspected quarterly as discussed in Section 4.05.6. Please see Exhibit 23, Item 1 – Geotechnical Report Collom Temporary Spoil Pile and Pond and Exhibit 23, Item 2. Also refer to Exhibit 7, Item 25 – Collom Post Mine Channel Design; Exhibit 7, Item 23, Part C – Collom Pond Design Maps; and Exhibit 7, Item 23 (for information pertaining to diversion channels during mining) for specific designs and locations of these structures. During the initial facitlites development a stage development of the Section 36, Middle Pond, and Section 25 Pond will occur to avoid the brooding and lekking season for Greater Sage Grouse. This plan can be seen in Exhibit 7, Item 23, Part J. The sediment ponds will remain in place until such time as the entire disturbance footprint area reporting to these structures is reclaimed and the requirements of Rule 4.05.2(2) are met. The best case scenario for this would be a minimum of 2 years after the last seeding occurs within the affected contributing watershed. Therefore, the earliest anticipated removal of these structures is approxiamtely 2035. One containment pond (Wilson Storage Pond) is utilized to store water during the initial construction of the Collom Haul Road and Collom Facilities Area. Water is pumped or trucked in from an exisisting