2025-04-23_INSPECTION - C1981019

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April 16, 2025 C-1981-019/Colowyo Coal Mine HR1 Number of Partial Inspection this Fiscal Year: 7 Number of Complete Inspections this Fiscal Year: 3 Page 4 of 18 Section 15 Pond was inaccessible due to blocked access routes. Section 16 Pond was able to be accessed for this inspection and was found to be holding water and free of any stability or erosional issues (Photo 13). A small section of the West Section 16 Ditch was walked from the pond and found to be stable (Photo14). The following ditches in the East Pit were observed during the inspection: Prospect Ditch (Reach 1 (Photo 20)), North Tributary East Pit Ditch (Reaches 1 (Photo 22 and 2 (Photo 23)), and Final East Pit Ditch (Reaches 2 and 3 (Photo 17)). Gabion boxes along theses ditches were in place and rip rap boulders appeared stable and unmoved by flows. All ditches were functioning properly with no signs of erosion or cutting. South Taylor Section 28 (Photos 7 and 8) and Section 29 (Photos 9 and 10) ditches were partially walked and partially inspected from viewpoints. Both ditches were dry and vegetated. No weeds were observed. Taylor Creek East Taylor and West Taylor Pond were inspected this month along Taylor Creek (Photos 26-28). Both ponds were holding water and had stable embankments. No issues were noted. Highway 13 Areas Section 28 Pond and Prospect Pond, accessible via Hwy 13, were inspected. Prospect pond held water at the time of inspection and all embankments appeared to be stable and vegetated (Photo 24). Section 28 Pond was dry (Photo 25). No issues were reported. FISH and WILDLIFE – Rule 4.18: No negative impact to wildlife was observed. A large herd of elk were observed across several areas of the site, along with observation of a small group of pronghorns and various waterfowl. ENFORCEMENT ACTIONS/COMPLIANCE No enforcement actions were initiated as a result of this inspection, nor are any pending.