2024-08-22_PERMIT FILE - C1981019A

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RULE 4 PERFORMANCE STANDARDS Rule 4 Performance Standards 4-32 Revision Date: 6/24/24 Revision No.: MR-255 In February of 2016, the Colowyo Mine site experienced a very high wind event which snapped a power pole off at the base and left the power pole dangling from the line. Colowyo constructed an emergency road into the pole location (0.4 acres of disturbance) to access the location, stabilize the line, and replaced the broken pole. Topsoil was windrowed with a dozer down gradient of the road footprint to minimize surface water flow from the area of disturbance to native areas. Once ground conditions allow access, the entire road footprint will have the topsoil re-spread on the area, and it will be seeded in accordance with the approved reclamation seed mixture. Please see Figure 4.12-4 for a location of the emergency road that was constructed to repair the power pole. In 2016, the Inactive Mine and Reclamation Program (IMR) began a drilling program to define the burn limits to abate an underground mine fire at the abandoned underground workings at the Axial Mine. The Axial Mine workings are shown on Map 22 and are labeled as the Red Wing Mine. The Axial Mine and Red Wing Mine shared common workings. The drilling project will create ground disturbance within the permit boundary to support the drilling program. These disturbances may include but are not limited to temporary roads, drill pads, and mud pits. The final locations to be disturbed will be determined by IMR. The IMR team will also at times be mitigating surface fire potential for the Axial Mine Fire and some of these activites may occur with a very small portion of Colowy’s permit boundary just north of the lower reach of the Streeter Ditch. 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 2016, approximately 4 acres within Colowyo’s permit boundary was affected by the moderate intensity wild land fire. The location of the fire is shown on Figure 4.12-5. The area that was burned is mostly comprised of Gambel’s Oakbrush and low density sagebrush. Additional surface disturbance within the permit boundary of approximately 1.4 acres was created to cut in a fire line to control and fight the fire. The relatively low intensity nature of the fire does not appear to 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