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March 29,2022 C-1981-019/Colowyo Coal Mine ZTT <br /> Active regrade work at the West Pit. <br /> EXCESS SPOIL and DEVELOPMENT WASTE—Rule 4.09 <br /> Placement;Drainage Control; Surface Stabilization: <br /> Spoil placement continues at the Collom Temporary Spoil Pile.None was observed at the time of the inspection. <br /> EXPLOSIVES—Rule 4.08 <br /> Distance Prohibitions 4.08.4; Warnings 4.08.4;Control of Adverse Effects 4.08.4: <br /> Drilling and blast preparation activities was observed at the South Taylor Pit. The blast was not scheduled to occur <br /> during the inspection and was not observed. <br /> HYDROLOGIC BALANCE -Rule 4.05 <br /> 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; <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 /> During the inspection,the Division inspected portions of Prospect Ditch,North Trib. East Pit Ditch,and Final East <br /> Pit Ditch due to ground conditions. Each ditch is located in the reclaimed East Pit area. All ditches were stable <br /> with no issues. Limited water was present in Prospect and North Trib. East Pit Ditches but each associated stock <br /> tank were full with water. The lower portion of the Final East Pit Ditch had noticeable flow through it. The ditch <br /> was stable and showed no signs of cutting or major erosion. <br /> Number of Partial Inspection this Fiscal Year. 6 <br /> Number of Complete Inspections this Fiscal Year 3 <br /> Page 3 of 10 <br />