_INSPECTION - C1994082 (7) - Laserfiche WebLink

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May 17, 2011 C-I 994-082/Yoast Mine SLB Inspection Topic Summary NOTE: Y=Inspected N=Not Inspected R=Comments Noted V=Violation Issued NA=Not Applicable N - Air Resource Protection V -Roads N -Availability of Records N -Reclamation Success Y -Backfill&Grading R -Revegetation NA -Excess Spoil and Dev.Waste NA -Subsidence NA -Explosives R - Slides and Other Damage R -Fish&Wildlife Y - Support Facilities On-site R -Hydrologic Balance R - Signs and Markers Y -Gen. Compliance With Mine Plan NA - Support Facilities Not On-site NA -Other NA - Special Categories Of Mining NA -Processing Waste N -Topsoil COMMENTS This was a partial inspection of the Yoast Mine conducted by Susan Burgmaier and Brock Bowles(DRMS). Roy Karo of Seneca Coal Company was present during portions of the inspection. Weather varied during the inspection, from sunny and warm to rain and snow showers. Locally,weather patterns continue with cooler temperatures and higher than normal precipitation. The Yampa River basin is at 201%of normal. Most of the snow has melted off the upper areas of the mine site. 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: Pond 010 was discharging clear water. The embankment and discharge areas were stable and well vegetated. Ducks(Mallards and Cinnamon Teals)were on the pond and several songbirds were observed around the immediate area. Ponds 011,012 and 013 were discharging clear water; outfall areas and embankments were in good condition. The rip rap of the emergency spillway of Pond 012 was covered with soil material apparently laid down to facilitate equipment travel during repairs to the Pond 012 slide area last year. The soil materials need to be removed and the rip rap supplemented as necessary to meet the design standard for the channel. Post Mining Drainage-YTM-20 needed to be maintained where it crosses under Haul Road B at Culvert EX-2. Postmining Drainage YPM-22 was in good condition,but flow that should have been directed through this channel moved outside of the channel and caused a gully(approximately 24"deep)through the shrub enclosure area adjacent to the channel. The operator will need to regrade the upper end of the channel to ensure that flow is routed to the constructed drainage. The drainage that runs along the south side of Topsoil Stockpile TSS-I was severely eroded(gully approximately 375' long; 2' deep), resulting in the loss of a number of shrub seedlings that had been planted in the area. The operator needs to repair the gully and armor the channel as necessary to prevent further erosion. There Number of Partial Inspection this Fiscal Year: 9 Number of Complete Inspections this Fiscal Year: 3 Page 2 of 15