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2016 ANNUAL IMPOUNDMENT INSPECTION <br />Mine: New Horizon North Mine <br />Pond Name: Pond 001 <br />NPDES Permit & Outfall #s: CO -850062 <br />Date Inspected: 3 -March -2016 <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: 16 -October -2015 <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 = 11.92 ac -ft <br />Sediment Volume (SV) at Inspection: 0.68 ac -ft, AutoCAD calculated <br />Surface Water elev. 5666.85- Surveyed Pond Bottom elev. 5666.2 = Water Depth 0.65 <br />Water Volume (WV) in Pond NA ac -ft (using as built capacity table & surface water elevation, and then <br />subtracting sediment volume under water level) <br />Pond Capacity Available below primary spillway 11.92 ac -ft [As Built Pond Capacity — W �IL�Icc&44 <br />Inflow volume from 10 -yr 24 -hr storm runoff event 11.09 ac -ft �� ••••K.�F�r • <br />Note: 2.2 feet of sediment at east end Qg <br />M: ENG\NHN\Env\Pond Exams & Insp\2016_03 Annual Impoundment Inspections.doc <br />46342 <br />Circle or Write appropriate Response <br />1. <br />Seepage (specify location, color, and approx. volume) <br />s <br />A •. <br />•.•• <br />2. <br />Cracks <br />Yes <br />or scarps on crest or slopes <br />3. <br />Sloughing or bulging on slopes <br />Yes <br />tc <br />N/A <br />4. <br />Major erosion problems <br />Yes <br />N/A <br />S. <br />Surface movements in valley bottom or on hillside <br />Yes <br />10 <br />N/A <br />6. <br />Water impounded against toe <br />Yes <br />IyV <br />N/A <br />7. <br />Clogging <br />(� <br />a) Spillway channels and pipes <br />Yes <br />N/A <br />b) Decant system <br />Yes <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 />Q� <br />N/A <br />b) Decant system <br />Yes <br />N/A <br />9. <br />Trash racks clear and in place <br />e- <br />No <br />N/A <br />10. <br />Monitoring instrumentation in place & functioning <br />e <br />No <br />N/A <br />Comments: Prairie Dog holes dugout a couple times. Irrigation water piped away from <br />discharge pipe. <br />M: ENG\NHN\Env\Pond Exams & Insp\2016_03 Annual Impoundment Inspections.doc <br />