_INSPECTION - C1981019 (3) - Laserfiche WebLink

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September 23,2013 C-1981-019/Colowyo Coal Mine RDZ HYDROLOGIC BALANCE -Rule 4.05 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; Diversions 4.05.4; Effluent Limits 4.05.2; Ground Water Monitoring 4.05.13; Surface Water Monitoring 4.05.13; Drainage—Acid and Toxic Materials 4.05.8; Impoundments 4.05.6,4.05.9; Stream Buffer Zones 4.05.18: All observed ponds were holding water from recent storms. Some observed ponds were not discharging: Section 16,Prospect,Gossard,Work Area,PD1,NTEP1, and Taylor Pump Holding Pond. The following ponds were discharging: Streeter,West Taylor,East Taylor, and Stoker Siding (minor discharge). For all discharging ponds,no sign of pollutants was observed. No major problems were found with embankments or other structures. Some additional observations regarding the ponds: • The flumes below Stoker Siding and Prospect require vegetation removal. • Streeter Pond still needs cleaning. • A delta is building in East Taylor Pond. • PD1 was full(just below spill point) and needs to be drained. The following observations were made regarding ditches: • Taylor Tributary Ditch,Taylor Ditch, and East Taylor Ditch were found to be stable. • Streeter Gulch Ditch was observed from the Southwest Tributary to the Streeter Fill, and no erosion or other problems were observed in the ditch. • The Section 16 Ditch was observed for several hundred feet above the pond. The deep section(observed in past inspections)appeared to be draining well. • The Section 28 Ditch was inspected(all but the western-most segment). No problems were identified with the unlined portion. The lower end of the liner is peeling away from the ground,however,and needs to be repaired. • At the lower end of the Section 29 Ditch, a small pond of water was observed. This part of the ditch should be re-graded to provide positive drainage. • NTEP Ditch is in good shape. Sumps along Taylor Creek were observed. Sump 92 and Sump 45 were full of water. Sump 91 requires cleaning, and the spillway requires additional armoring. In the lower portion of Prospect Ditch where repairs were performed,wattles need to be re-trenched and re-staked. There is no erosion in the channel. Contour ditches in this area are in good shape. The culvert below the Gossard discharge point(under the railroad tracks)requires minor cleaning on the downstream end. Culverts M and L are clean. Culvert K is half full of sediment at the upstream end and needs to be cleaned. GENERAL MINE PLAN COMPLIANCE: The Colowyo Coal Mine was generally found to be in compliance with the mine plan. Number of Partial Inspection this Fiscal Year: 3 Number of Complete Inspections this Fiscal Year: 1 Page 3 of 10