_INSPECTION - C1981019 (18) - Laserfiche WebLink

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July 9,2013 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: Some observed ponds were not discharging: West Pit, Section 28,Prospect,Gulch A,Rail Loop,Work Area,PDI,PD2,EPI, and EP2. The following ponds were discharging: Streeter, Stoker Siding,West Taylor, and East Taylor. 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 flume below Prospect Pond requires grass removal on either side. • Prospect Pond still requires some cleaning of sediment in the pond. • Rail Loop pond will be surveyed and the banks seeded in 2013 (per Kurt Blunt). The following observations were made regarding ditches: • Per Tony Tennyson,East Taylor Ditch has been repaired recently; during the inspection no problems were identified. • No problems in Taylor Tributary Ditch or Taylor Ditch were identified. • In the X-Pod area two constructed ditches,Tributary D and Tributary F,were inspected. There is no erosion in either channel. • Prospect Ditch was inspected and no erosion or other problems were identified. The section of Prospect Ditch that was repaired in 2012 (at the edge of the undisturbed area)was inspected, and it generally looked good. Some of the wattles require maintenance. • The ditch below the Gossard Pond outlet requires the removal of tumbleweeds. • No problems were observed with NTEP Ditch or East Pit Ditch. The springs above East Taylor Pond were observed. The one on the west side was flowing;no pollutants were detected. The spring on the east side was not flowing. The following observations were made regarding culverts: • Culvert K has been cleaned. • The 10-foot culvert where Taylor Creek flows under Haul Road A is clear on the upstream side. (It was not observed on the downstream side.) • The outlet of the Gossard Pond and the culvert below this(under the railroad tracks) require cleaning. • Culvert N is clean and no erosion was observed. The size of 48"diameter was confirmed with a tape measure. Most sumps along Taylor Creek are clear. Sump #5 requires cleaning; per Colowyo staff this is due to a recent storm, and maintenance will be performed soon. GENERAL MINE PLAN COMPLIANCE: The Colowyo Coal Mine was generally found to be in compliance with the mine plan. The area along the entrance road(Haul Road B)that was damaged by fire in June 2012 is recovering well. Number of Partial Inspection this Fiscal Year: 1 Number of Complete Inspections this Fiscal Year: 0 Page 3 of 9