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2016 ANNUAL IMPOUNDMENT INSPECTION <br />Mine: New Horizon North Mine <br />Pond Name: Pond 002 <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.: 5688.0 As Built Pond Bottom elev.: 5677.0 <br />As Built Pond Emergency Spillway elev.: 5686.0 As Built Pond Primary Spillway elev.: 5684.0 <br />As Built Pond Capacity (pond bottom to primary spillway) per As Built 12.62 ac -ft <br />Existing Pond Capacity (pond bottom to primary spillway): As Built Volume - SV = 12.62 ac -ft <br />Sediment Volume (SV) at Inspection: None <br />Surface Water elev. —Dry — As -built Pond Bottom elev. 5677.0 = Water Depth NA <br />Water Volume (WV) in Pond —DRY ac -ft (using as built capacity table & surface water elevation, an <br />then subtracting sediment volume under water level) QePQO <br />Pond Capacity Available below primary spillway 12.62 ac -ft [As Built Pond Capacity — WV — �.•� K. <br />Vo � <br />Inflow volume from 10 -yr 24 -hr storm runoff event 8.6 ac -ft .� <br />Note: Small water puddle at south end ) • 6: <br />Circle or Write appropriate Response.• <br />Yes ,�q� <br />N/A <br />1. Seepage (specify location, color, and approx. volume) <br />Yes <br />$ <br />2. Cracks or scarps on crest or slopes <br />Yes�r1 <br />N/A <br />3. Sloughing or bulging on slopes <br />Yes <br />N/A <br />N/A <br />4. Major erosion problems <br />Yes <br />Vpacy N/A <br />5. Surface movements in valley bottom or on hillside <br />Yes <br />lJ� N/A <br />l� <br />6. Water impounded against toe <br />Yes <br />N/A <br />7. Clogging <br />a) Spillway channels and pipes <br />Yes ,�q� <br />N/A <br />b) Decant system <br />Yes <br />N/A <br />C) Diversion Ditches <br />Yes <br />N/A <br />8. Cracking or crushing of pipes <br />(� <br />a) Spillway pipes <br />Yes <br />N/A <br />b) Decant system <br />Yes <br />N/A <br />9. Trash racks clear and in place <br />No <br />N/A <br />10. Monitoring instrumentation: in place & functioning <br />y No <br />N/A <br />Comments: <br />M: ENG\NHN\Env\Pond Exams & Insp\2016_03 Annual Impoundment Inspections.doc <br />