2025-11-25_INSPECTION - C1981019 (2)

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November 20,2025 C-1981-019/Colowyo Coal Mine HRI highwall,temporary spoil piles, and the internal haul road(Photo 15). Southern portions of West Pit were recently Phase I released under SL-24(Photo 17).An old drag line will need to be removed from the West Pit in final reclamation. South Taylor Active backfill operations were not observed at the time of inspection but backfill efforts had progressed noticeably since the Division's last on the ground inspection(Photo 13). Backfill material is being excavated from around various points of the South Taylor temporary spoil pile and dump areas appear to be concentrated along the southern edge of South Taylor Pit. HYDROLOGICBALANCE- Rule 4.05; Drainage Control 4.05.1,4.05.2,4.05.3; Siltation Structures 4.05.5,4.05.6; Discharge Structures 4.05.7,4.05.10;Diversions 4.05.4; Effluent Limits 4.05.2; Ground Water Monitoring 4.05.13; Surface Water Monitoring 4.05.13; Drainage—Acid and Toxic Materials 4.05.8;Impoundments 4.05.6,4.05.9; Stream Buffer Zones 4.05.18: Taylor Creek&West Pit The West Pit Pond(Photo 19) and East Taylor Pond(Photo 18)were inspected along Taylor Creek. West Taylor Pond was inspected from above at the face of the valley fill(Photo 14).West Taylor Pond was dry, stable, and free of erosional concerns. East Taylor and West Taylor Pond were both holding water and no concerns were noted at the ponds or at their inflow and outfall locations. The East Taylor Pond pilot water treatment plant has been shut down for the season. The following stock ponds and ditches in West Pit were inspected from a high vantage point(Photos 15 and 16): ETD I,TD1,East Taylor Ditch,and Taylor Ditch.Both stock ponds were holding water and ditches appeared stable and functioning as designed.No issues are noted. East Pit& Section 3 The following ditches and stock ponds in the East Pit were observed during the inspection(Photos 2— 11): PD1,PD2,NTEP1,EP1,EP2,EP3,Reach 1 of Prospect Ditch,Reach 1 of North Tributary East Pit Ditch,Final East Pit Ditch(Reaches 1,2,and 3) and Section 15 Ditch. Inspection locations were observed on the ground as well as from the north facing a slope below Section 15 Ditch.All stock ponds were holding water,though EP3 was holding very little. Section 15 Pond was also holding water,but this was a very small amount.All inlet and outlet areas and channels for the stock ponds were stable and in place as designed.No obstructions,signs of instability or erosion were noted. The reach channels inspected in this area were also free of any signs of instability or variance from their intended design. The Upper and Lower Section 3 Ponds were inspected(Photo 1)and found to be holding a small amount of water. The inlet and outlet areas for these ponds were free of any signs of erosion, and no concerns were noted. Prospect Pond and Section 16 Pond Prospect Pond(Photo 20)was inspected from the ground.No problems or concerns were noted. Section 16 Pond was also accessible during this inspection(Photo 12). The pond was holding a small amount of water,and no concerns were noted. FISH and WILDLIFE—Rule 4.18: No negative impact to wildlife was observed during the inspection.A mid-sized herd of elk were seen traversing the site throughout the inspection day.A pair of large raptors were also noted at the site. Number of Partial Inspection this Fiscal Year: 4 Number of Complete Inspections this Fiscal Year: 1 Page 3 of 14