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ANNUAL IMPOUNDMENT INSPECTION FORM <br />Mine: New Horizon North Mine <br />Pond Name: Pond 001 <br />NPDES Permit & Outfall #s: CO- 850062 <br />Date Inspected: 10- March -2015 <br />Location Description: 2.4 miles NW of Nucla <br />Owner's Rep.: Rick Wolney, Mine Manager <br />Pond Type: Partly Incised <br />CDRM & S #: C- 2010 -089 <br />Date Last Inspected: 22- October -2014 <br />Legal Location: Sec 25 of T47N R16W <br />Inspector's Name: Frank Ferris <br />Pond Capacity Data <br />As Built Pond Embankment elev.: 5680.0 As Built Pond Bottom elev.: 5665.0 <br />As Built Pond Emergency Spillway elev.: 5677.5 As Built Pond Primary Spillway elev.: 5675.5 <br />As Built Pond Capacity (pond bottom to primary spillway) per As Built 12.6 ac -ft <br />Existing Pond Capacity (pond bottom to primary spillway): As Built Volume - SV = 11.97 ac -ft <br />Sediment Volume (SV) at Inspection: 355 ft X 50 X 0.5 + 325 ft X 50 ft X depth 1.15 ft = 0.63 ac -ft <br />Surface Water elev. Dry - Surveyed Pond Bottom elev. 5666.2 = Water Depth NA <br />Water Volume (WV) in Pond NA ac -ft (using as built capacity table & surface water elevation, <br />D0 Llc <br />subtracting sediment volume under water level) �p� K, FF <br />Pond Capacity Available below primary spillway 11.97 ac -ft [As Built Pond Capacity — W�a <br />Inflow volume from 10 -yr 24 -hr storm runoff event 11.09 ac -ft <br />Note: 1.8 feet of sediment at east end `�6342 <br />m� <br />Circle or Write appropriate Response <br />1. Seepage (specify location, color, and approx. volume) <br />UNA��`" <br />2. <br />Cracks or scarps on crest or slopes <br />Yes <br />�6 <br />N/A <br />3. <br />Sloughing or bulging on slopes <br />Yes <br />N/A <br />4. <br />Major erosion problems <br />Yes <br />N/A <br />5. <br />Surface movements in valley bottom or on hillside <br />Yes <br />N/A <br />6. <br />Water impounded against toe <br />Yes <br />15 <br />N/A <br />7. <br />Clogging <br />a) Spillway channels and pipes <br />Yes <br />10 <br />N/A <br />b) Decant system <br />Yes <br />19 <br />N/A <br />C) Diversion Ditches <br />Yes <br />N/A <br />8. <br />Cracking or crushing of pipes <br />a) Spillway pipes <br />Yes <br />N/A <br />b) Decant system <br />Yes <br />N/A <br />9. <br />Trash racks clear and in place <br />YeY <br />No <br />N/A <br />10. <br />Monitoring instrumentation ` c w y <br />to <br />No <br />N/A <br />Comments: The east end has a wedge of sediment 325 feet long, 50 feet wide, and tapering E -W from 1.8 to <br />.5 feet and west 355 feet has 0.5 feet of sediment. Embankment mowed. <br />M: ENG \NHN \Env \Pond Exams & Insp \2015_03 Pond Examination.doc <br />