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

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RULE 4 PERFORMANCE STANDARDS Rule 4 Performance Standards 4-33 Revision Date: 4/9/25 Revision No.: MR-261 In 2019, the surface landowner replaced a culvert under the Taylor Creek Access Road (please see Map 25C for location of the road) to support long-term access up the Taylor Creek drainage. Minimal ground disturbance was associated with replacing the culvert. Since the activity is related to the surface landowner, it is not permitted and bonded for in accordance with Rule 3.02.1(2). In 2019, approximately 13.5 acres within Colowyo’s permit boundary (outside of the disturbance boundary) adjacent to the Collom Haul Road was affected by the wild land fire caused by high winds slapping power lines together. The location of the fire is shown on Figure 4.12-7. The area that was burned is mostly comprised of 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. Tri-State Generation and Transmission Association, Inc. owns and operates a 138kV power line that traversers through the east portion of the permit boundary. The 138kV line runs north to south through the reclaimed East Pit, and just east of the reclaimed Section 16 Pit. To ensure access to all pole locations along the power line for maintenance and emergency repairs, Tri-State will be improving existing ranch roads and/or constructing new roads to access their power line within the permit boundary. Most of this activity will take place south of the reclaimed East Pit and outside of Colowyo’s ground disturbance and reclamation areas. Nonetheless, some of these access locations will traverse across Phase III released areas (Section 16 reclamation areas) and reclaimed areas including reclamation units EP056 and EP060 (please see annual reclamation report maps for the location of these reclamation units). For the approximate alignment for this access road please see Map 22A. Since these ground disturbing activities are not related to Colowyo’s mining activities, the roads will not be permitted and bonded for in accordance with Rule 3.02.1(2). In 2021, White River Electric Association upgraded their existing power line within the permit boundary and added to this existing line along Moffat County Road 51 to service customers in the area of Wilson Creek. All ground disturbing activities associated with the upgraded power line and the new power line construction is associated with White River Electrical Association and not Colowyo; therefore, it is not permitted for Colowyo nor required to be bonded for in accordance with Rule 3.02.1(2). In 2021, approximately 641 acres within Colowyo’s permit boundary, directly adjacent to the east side of the Collom Pit, was affected by a wild land fire. The location of the wild land fire is shown on Figure 4.12-8. The area that was burned is mostly comprised of sagebrush. Additional surface disturbance within the permit boundary of approximately five acres was created to cut in a fire lines 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 areas impacted by the fire lines will be roughened, seeded with the approved reclamation seed mix, and reported in the annual reclamation report. On September 28, 2022, approximately 11 acres within Colowyo’s permit boundary, directly adjacent to the Gossard Loadout was affected by a wild land fire. The location of the wild land fire is shown on Figure 4.12-7. The area that was burned is mostly comprised of sagebrush. The local Bureau of Land Management field office determined the fire was due to a bird striking a power line and the fire was not related to Colowyo’s mining operations.