2021-04-13_INSPECTION - C1981019

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Apri17, 2021 C-1981-019/Colowyo Coal Mine ZTT West Taylor Fill. Collom Temporary Spoil Pile. FISH and WILDLIFE—Rule 4.18: Elk and pronghorn were spotted throughout the site. HYDROLOGIC BALANCE -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: All ponds at the Colowyo Mine were inspected.This included the Prospect, Streeter, Section 16, Section 28,Work Area,West Taylor,East Taylor,West Pit, Stoker Siding,Gossard,Rail Loop,Temporary Facilities Pond, Section 36,Middle, Section 25, Sidehill and Section 26 Ponds.Most ponds held minimal water with no discharge or were dry. The Streeter,East Taylor,West Taylor, Stoker Siding Ponds and Section 36 were the only ponds discharging at the time of the inspection.All pond embankments were stable and all spillways were in functioning order. Repair work at the Stoker Siding Pond was inspected. In 2020,the primary discharge was replaced which required the embankment to be dugout to remove the old piping.The new discharge pipe is functional and the embankment of the Stoker Siding Pond has been reconstructed and reseeded.New vegetation was observed growing along the repaired areas of the pond. Ditches throughout the site were inspected. East Pit: The Final East Pit Ditch(FEPD) and the North Tributary,East Pit Ditch(NTEPD)and associated stock tanks were walked and inspected.Both ditches were stable and well armored with no erosion or cutting.NTEPD was dry at the time of the inspection. The FEPD had water draining through the ditch along the lower reaches of the ditch. Number of Partial Inspection this Fiscal Year: 6 Number of Complete Inspections this Fiscal Year: 3 Page 3 of 9