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2017 ANNUAL IMPOUNDMENT INSPECTION <br />Mine: New Horizon 2 Mine <br />Pond Name: Pond 012 <br />NPDES Permit & Outfall #s: CO -0000213 <br />Date Inspected: 25 -October -2017 <br />Location Description: 2 miles NW of Nucla <br />Owner's Rep.: Frank Ferris, Mine Manager <br />Pond Type: Partly Incised <br />CDRM & S #: C-1981-008 <br />Date Last Inspected: 2 -March -2016 <br />Legal Location: Sec 36 of T47N R16W <br />Inspector's Name: Frank Ferris <br />Pond Capacity Data <br />As Built Pond Embankment elev.: 5608.5 As Built Pond Bottom elev.: 5596.5 <br />As Built Pond Emergency Spillway elev.: NA As Built Pond Primary Spillway elev.: 5606.5 <br />As Built Pond Capacity (pond bottom to primary spillway) per As Built 4.9 ac -ft <br />Existing Pond Capacity (pond bottom to primary spillway): As Built Volume - SV = 4.72 ac -ft <br />Sediment Volume (SV) unchanged: 3 areas =-0.18 ac -ft <br />Surface Water elev. dry - As Built Pond Bottom elev. 5596.5 = Water Depth dry <br />Water Volume (WV) in Pond dry (using as built capacity table & surface water elevation, and then <br />subtracting sediment volume under water level) <br />Pond Capacity Available below primary spillway 4.72 ac -ft [As Built Pond Capacity — WV — SV] <br />Inflow volume from 10 -yr 24 -hr storm runoff event 3.41 ac -ft <br />Circle or Write appropriate Response <br />1. <br />Seepage (specify location, color, and approx. volume) <br />Yes <br />bX <br />N/A <br />2. <br />Cracks or scarps on crest or slopes <br />Yes <br />N/A <br />3. <br />Sloughing or bulging on slopes <br />Yes <br />I <br />N/A <br />4. <br />Major erosion problems <br />Yes <br />IM <br />N/A <br />5. <br />Surface movements in valley bottom or on hillside <br />Yes <br />X <br />N/A <br />6. <br />Water impounded against toe <br />Yes <br />Jl( <br />N/A <br />7. <br />Clogging <br />a) Spillway channels and pipes <br />Yes <br />�/ <br />X <br />N/A <br />b) Decant system <br />Yes <br />IX <br />N/A <br />C) Diversion Ditches <br />Yes <br />f <br />N/A <br />8. <br />Cracking or crushing of pipes <br />a) Spillway pipes <br />Yes <br />'n <br />N/A <br />b) Decant system <br />Yes <br />N/A <br />9. <br />Trash racks clear and in place <br />A <br />No <br />N/A <br />10. <br />Monitoring instrumentation <br />Yes <br />No <br />IX <br />Comments: Sediment accumulation in 3 areas = 0.18 ac -ft. <br />No significant sediment change since 2015 <br />M:\New Horizon 2\Environmental\Pond Inspections & Examinations\2017_10 Annual Impoundment Inspections.doc <br />