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2017 ANNUAL IMPOUNDMENT INSPECTION <br />Mine: New Horizon North Mine <br />Pond Name: Pond 002 <br />NPDES Permit & Outfall #s: CO -850062 <br />Date Inspected: 25 -October -2017 <br />Location Description: 2.4 miles NW of Nucla <br />Owner's Rep.: Frank Ferris, Mine Manager <br />Pond Type: Partly Incised <br />CDRM & S #: C-2010-089 <br />Date Last Inspected: 3 -March -2016 <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, and <br />then subtracting sediment volume under water level) <br />Pond Capacity Available below primary spillway 12.62 ac -ft [As Built Pond Capacity — WV — SV] <br />Inflow volume from 10 -yr 24 -hr storm runoff event 8.6 ac -ft <br />Note: Small water puddle at north end <br />Circle or Write appropriate Response <br />1. Seepage (specify location, color, and approx. volume) <br />Yes <br />2. Cracks or scarps on crest or slopes Yes <br />3. <br />4. <br />5. <br />6. <br />7. <br />8. <br />9. <br />10 <br />Sloughing or bulging on slopes <br />Major erosion problems <br />Surface movements in valley bottom or on hil <br />Yes <br />Yes <br />Yes <br />Water impounded against toe Yes <br />Clogging <br />a) Spillway channels and pipes <br />b) Decant system <br />C) Diversion Ditches <br />Cracking or crushing of pipes <br />a) Spillway pipes <br />b) Decant system <br />Trash racks clear and in place <br />Monitoring instrumentation: in place & functioning <br />Comments: <br />IAI& <br />NK <br />yI'K <br />Yes NX <br />Yes <br />Yes Nb/ <br />Yes f <br />Yes NA <br />is No <br />YX No <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />M:\New Horizon North\Environmental\Pond Inspections & Examinations\2017_10 Annual Impoundment Inspections.doc <br />