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June 4, 2020 C-1981-019/Colowyo Coal Mine ZTT <br />West Pit backfill and regrade. <br />Berm at West Pit regrade. <br />South Taylor Pit backfill. <br />EXCESS SPOIL and DEVELOPMENT WASTE — Rule 4.09 <br />Placement; Drainage Control; Surface Stabilization: <br />The Collom Temporary Spoil Pile was inspected. Currently, the Colowyo mine is approved for 13.5 milling cubic <br />yards of excess spoil at the Collom Temporary Spoil Pile. At the time of the inspection, approximately 12.2 <br />Million cubic yards of spoil has been placed on the pile. Spoil is being placed by shovel and truck operations and <br />then spread and compacted by dozers. The pile is stable and no issues were observed. <br />Number of Partial Inspection this Fiscal Year: 10 <br />Number of Complete Inspections this Fiscal Year: 4 <br />Page 3 of 8 <br />