2025-06-30_PERMIT FILE - C1981019A (3)

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RULE 4 PERFORMANCE STANDARDS Rule 4 Performance Standards 4-32 Revision Date: 4/9/25 Revision No.: MR-261 warrant or require supplemental seeding; however, the area impacted by the fire line will be smoothed over and seeded with the approved reclamation seed mix. In the fall of 2016 and spring of 2017 White River Electric Association (WREA) installed and removed power lines located within the Colowyo permit boundary. The power lines that were serviced are located adjacent the Gossard Loadout facility (an overhead line will be buried) and Jubb Creek (new overhead line) north towards Moffat County Road 32. These power lines that were installed and removed are owned and operated by WREA. The final locations that will be serviced and potentially create ground disturbance will be determined by WREA. These ground disturbing activities are not associated with the Colowyo’s mining activities, and will not be required to be permitted nor bonded for in accordance with Rule 3.02.1(2). In 2017, Chevron dug up and capped an existing unused oil line in several locations just south of the Gossard Loadout facilities within the Colowyo permit boundary. These ground disturbing activities are not associated with the Colowyo’s mining activities, and will not be required to be permitted nor bonded for in accordance with Rule 3.02.1(2). At various times during the mine life of the Colowyo operation, Colowyo as a private landowner, will construct new ranch roads and/or repair or upgrade existing ranch roads within the permit boundary. These activities are not associated with the mining operation and will only occur outside of the permitted disturbance boundary. Please see Maps 19, 19B, and 19C for the permitted disturbance areas. The construction and/or repairs to these ranch roads will facilitate ongoing private landowner activities including ranching, grazing, hunting, and access for other entities which hold right of ways within the permit boundary. These ranch roads activities are not associated with Colowyo’s mining activities, and will not be required to be permitted nor bonded for in accordance with Rule 3.02.1(2). White River Electric Association (WREA) will construct, operate, and maintain a 69 kV power line from the Axial Basin substation adjacent to State Highway 13 to the Collom facilities area. This power line will be wholly owned by WREA. The ground disturbing activities associated with construction of the power line, including pole locations and roads to pole locations, are not associated with Colowyo’s mining activities, and will not be required to be bonded in accordance with Rule 3.02.1(2). The power line will service the area post-mining in Collom. Tri-State Generation and Transmission Association, Inc. (Tri-State) owns and operates the Axial Basin Substation, which provides electrical services locally in the Axial Basin area including to Colowyo. Tri-State will be expanding the footprint of the substation within the permit boundary on the east and west side of the current substation location. The ground disturbing activities from the expansion of the Axial Basin Substation are not associated with Colowyo’s mining activities, and will not be required to be permitted nor bonded for in accordance with Rule 3.02.1(2). In 2018, approximately 22 acres within Colowyo’s permit boundary (outside of the disturbance boundary) was affected by the wild land fire caused by a lighting strike. The location of the fire is shown on Figure 4.12-6. The area that was burned is mostly comprised of pinyon juniper and low- density sagebrush. Because the fire was not related to Colowyo’s mining activities, Colowyo, as the surface landowner will reseed or managed the post-fire area, as it deems appropriate.