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June 21,2017 C-1981-019/Colowyo Coal Mine ZTT <br /> Backfill on eastern side of South Taylor Pit. <br /> HYDROLOGIC BALANCE -Rule 4.05 <br /> Drainage Control4.05.1,4.05.2,4.05.3; Siltation Structures 4.05.5,4.05.6; Discharge Structures 4.05.7,4.05.10; <br /> Diversions 4.05.4;Effluent Limits 4.05.2; Ground Water Monitoring 4.05.13; Surface Water Monitoring 4.05.13; <br /> Drainage ❑Acid and Toxic Materials 4.05.8;Impoundments 4.05.6,4.05.9;Stream Buffer Zones 4.05.18: <br /> The length of all disturbance associated with the Collom Haul Road was inspected. Silt fence has been properly <br /> installed along the entire length of the haul road.No erosion or sediment issues were observed. <br /> Completed topsoil piles associated with the Collom Haul Road have had ring ditches constructed around the piles <br /> to capture any potential sediment.No issues were observed. <br /> The Wilson Storage Pond has been completed. Colowyo was actively pumping to the storage pond at the time of <br /> the inspection.No discharge was occurring. The mine is currently using water for dust suppression and other <br /> needs during the construction of the Collom Haul Road. The pond embankments have not yet been seeded but is <br /> scheduled for seeing this fall. <br /> Prospect, Gulch A and the Streeter Pond were all visually inspected from Highway 13. All ponds were stable and <br /> embankments were well vegetated. Pond cleaning was occurring at the Streeter Pond during the inspection. <br /> The West Pit Pond was dry at the time of the inspection.No issues were observed. <br /> The East Taylor Pond held water and was discharging. Embankments were vegetated and stable. <br /> The West Taylor Pond held water and was discharging.No issues were observed. <br /> Number of Partial Inspection this Fiscal Year: 9 <br /> Number of Complete Inspections this Fiscal Year: 4 <br /> Page 3 of 10 <br />