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November 16,2022 C-1981-019/Colowyo Coal Mine ZTT <br /> 4 <br /> West Pit regrade. <br /> EXCESS SPOIL and DEVELOPMENT WASTE—Rule 4.09 <br /> Placement;Drainage Control; Surface Stabilization: <br /> The Collom Temporary Spoil Pile continues construction as progression of the western portion of the Collom Pit <br /> continues.No placement was occurring at the time of the inspection. The approved disturbance boundary for the <br /> spoil pile was inspected with no issues.The area is well bermed in to contain spoil and delineate the approved <br /> boundary. <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 /> Ditches <br /> Two ditches associated with the South Taylor Pit were inspected.This included Section 28 Ditch and Section 29 <br /> Ditch.Both Section 28 and 29 Ditches receive runoff from disturbance associated with the crest of the southern <br /> highwall of the South Taylor Pit.No issues were observed. <br /> Three of the four ditches within the West Pit were inspected however the majority of their lengths were snow <br /> covered. These ditches included the Taylor Ditch,East Taylor Ditch and Buckskin Ditch.The Buckskin ditch has <br /> only a portion constructed at the moment and is located in the eastern portion of the West Pit.The Taylor Ditch is <br /> lined with rip rap for its entirety outside of the southern portion which has just been graded as part of excess spoil <br /> removal discussed earlier in this report.The East Taylor Ditch is mostly lined with rip rap with a portion that is a <br /> vegetated channel. ETD1 has received maintenance in 2021 which added an additional discharge point with rip <br /> rap.No issues were observed <br /> Number of Partial Inspection this Fiscal Year: 3 <br /> Number of Complete Inspections this Fiscal Year: 2 <br /> Page 3 of 8 <br />