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2017 ANNUAL IMPOUNDMENT INSPECTION <br />Mine: New Horizon 2 Mine <br />Pond Name: Pond 008 <br />NPDES Permit & Outfall #s: CO -0000213 <br />Date Inspected: 2 -March -2016 <br />Location Description: 1.5 miles West of Nucla <br />Owner's Rep.: Frank Ferris, Mine Manager <br />Pond Type: Partly Incised <br />CDRM & S #: C-1981-008 <br />Date Last Examined: 18 -October -2016 <br />Legal Location: Sec 6 of T46N R15W <br />Inspector's Name: Frank Ferris <br />Pond Capacity Data <br />Surveyed Pond Embankment elev.: 5658.7 As Built Pond Bottom elev.: 5644.0 <br />As Built Pond Emergency Spillway elev.: NA Surveyed Pond Primary Spillway elev.: 5655.0 <br />As Built Pond Capacity (pond bottom to primary spillway) per As Built 7.96 ac -ft <br />Existing Pond Capacity (pond bottom to primary spillway): As Built Volume - SV = 7.96 ac -ft <br />Sediment Volume (SV) at Inspection: length ft X width ft X depth ft = NA ac -ft <br />Surface Water elev. 5653.0 As Built Pond Bottom elev. 5644.0 = Water Depth 9.0 feet <br />Water Volume (WV) in Pond 6.1 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 1.86 ac -ft [As Built Pond Capacity — WV — SV] <br />Inflow volume from 10 -yr 24 -hr storm runoff event 3.56 ac -ft <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. Sloughing or bulging on slopes Yes <br />4. Major erosion problems Yes <br />5. Surface movements in valley bottom or on hillside Yes <br />6. Water impounded against toe Yes <br />7 <br />8 <br />9 <br />Clogging <br />a) <br />Spillway channels and pipes <br />b) <br />Decant system <br />C) <br />Diversion Ditches <br />Cracking <br />or crushing of pipes <br />a) <br />Spillway pipes <br />b) <br />Decant system <br />Trash racks clear and in place <br />10. Monitoring instrumentation <br />Comments: No sediment accumulation was observed in the pond. <br />X N/A <br />FX N/A <br />IX N/A <br />Xi N/A <br />lX N/A <br />X N/A <br />Yes X <br />Yes NX <br />Yes IX <br />Yes PIa <br />Yes IX <br />YX No <br />Yes No <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />M:\New Horizon 2\Environmental\Pond Inspections & Examinations\2017_10 Annual Impoundment Inspections.doc <br />