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April 25,2011 C-1 994-082/Yoast Mine SLB <br /> Inspection Topic Summary <br /> NOTE: Y=Inspected N=Not Inspected R=Comments Noted V=Violation Issued NA=Not Applicable <br /> N -Air Resource Protection R -Roads <br /> N -Availability of Records N -Reclamation Success <br /> N -Backfill&Grading N -Revegetation <br /> NA -Excess Spoil and Dev. Waste NA -Subsidence <br /> NA -Explosives R - Slides and Other Damage <br /> N -Fish&Wildlife N - Support Facilities On-site <br /> R -Hydrologic Balance R - Signs and Markers <br /> N -Gen. Compliance With Mine Plan NA - Support Facilities Not On-site <br /> NA -Other NA -Special Categories Of Mining <br /> NA -Processing Waste N -Topsoil <br /> COMMENTS <br /> This was a partial inspection of the Yoast Mine conducted by Susan Burgmaier,Brock Bowles, and Stephanie <br /> Reigh. No representatives of Seneca Coal Company were present during the inspection. Weather conditions <br /> during the inspection varied from cloudy and cool to intense snow squalls that limited visibility to approximately <br /> 100'. Ground conditions were extremely muddy; soils were super-saturated. The area has received record <br /> snowfall this season, and melting of uplands has been delayed due to cooler than normal weather and increased <br /> precipitation. The Yampa River and tributaries were already running high,with additional runoff yet to come. <br /> Routt County has issued flood alerts and landslide warnings. At the mine site, snow has not yet melted off of the <br /> upper pit area, and the roadways were impassable due to muddy conditions. Only Ponds 010,012, 013, and 014 <br /> were accessible for inspection. <br /> HYDROLOGIC BALANCE -Rule 4.05❑❑Drainage Control 4.05.1, 4.05.2, 4.05.3; Siltation Structures 4.05.5, <br /> 4.05.6; Discharge Structures 4.05.7, 4.05.10;Diversions 4.05.4;Effluent Limits 4.05.2; Ground Water <br /> Monitoring 4.05.13; Surface Water Monitoring 4.05.13;Drainage—Acid and Toxic Materials 4.05.8; <br /> Impoundments 4.05.6, 4.05.9; Stream Buffer Zones 4.05.18: <br /> Pond 010 held water below the discharge level. Pond 012 was discharging slightly cloudy water. There <br /> was significant inflow to the pond from the underdrain for areas upgradient of the pond(slide repair area). The <br /> upper few inches of the embankment surface was very saturated and muddy,but the embankment itself appeared <br /> to be stable. Pond 013 was discharging clear water. Several rodent holes were observed on the embankment. The <br /> excavations were limited in aerial extent and not likely to cause a failure of the dam,but should be repaired and <br /> the burrowers discouraged. Pond 014 was discharging slightly cloudy water. Downcutting was observed at inlet <br /> of the pond below the riprapped 3-2A drainage. Heavy flow from snowmelt runoff was observed in YPM 13-2 <br /> during the inspection. Sidecutting was observed in this channel(up to 3' deep and 2' wide)where flow had gone <br /> outside the riprapped channel. This area should be repaired when conditions allow. Diversion 13A, YPM 17, <br /> YPM4-2, and YPM4 were all stable. <br /> ROADS—Rule 4.03❑❑Construction 4.03.1(3)/4.03.2(3)❑❑Drainage 4.03.1(4)/4.03.2(4)❑❑Surfacing and <br /> Maintenance4.03.1(5)and(6)/4.03.2(5)and(6)❑❑Reclamation 4.03.1(7)/4.03.2(7): <br /> Number of Partial Inspection this Fiscal Year: 8 <br /> Number of Complete Inspections this Fiscal Year: 3 <br /> Page 2 of 8 <br />