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March 15,2023 C-1981-019/Colowyo Coal Mine ZTT <br /> � _- <br /> won <br /> Backfill in the South Taylor Pit. µ Excavator at South Taylor Temporary Spoil Pile. <br /> EXPLOSIVES—Rule 4.08 <br /> Distance Prohibitions 4.08.4;Warnings 4.08.4;Control of Adverse Effects 4.08.4: <br /> Blast drill holes were observed being drilled south of the primary pit area of Collom.No blast occurred during the <br /> inspection. <br /> FISH and WILDLIFE—Rule 4.18: <br /> Herds of deer were observed throughout the site. <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 /> Due to adverse ground conditions,only the following ponds were inspected: <br /> East Pit <br /> The Streeter and Prospect Ponds were inspected.Both ponds collect surface runoff associated with the East Pit and <br /> are located along Highway 13. Streeter Pond was inspected from the highway due to snow depths from <br /> precipitation events and snow plowing efforts.From the highway,the embankment was inspected.No issues could <br /> be observed. The Streeter Pond was accessible as the access road has been plowed for cleaning efforts.The pond <br /> had been partially cleaned.The sediment had been staged within the pond adjacent to the pond inlet. Sediment is <br /> being stored to help dry to become more solid to allow to be excavated and hauled off. The pond held water but <br /> well below the primary discharge pipe.No issues were observed with the Streeter Pond. <br /> Number of Partial Inspection this Fiscal Year: 6 <br /> Number of Complete Inspections this Fiscal Year: 3 <br /> Page 3 of 7 <br />