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2017 ANNUAL IMPOUNDMENT INSPECTION <br />Mine: New Horizon 2 Mine <br />Pond Name: Pond 013 <br />NPDES Permit & Outfall #s: CO -0000213 <br />Date Inspected: 25 -October -2017 <br />Location Description: 2 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: 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.: 5560.4 As Built Pond Bottom elev.: 5548.0 <br />As Built Pond Emergency Spillway elev.: 5557.0 As Built Pond Primary Spillway elev.: 5555.0 <br />As Built Pond Capacity (pond bottom to primary spillway) per As Built 6.14 ac -ft <br />Existing Pond Capacity (pond bottom to primary spillway): As Built Volume - SV = 6.14 ac -ft <br />Sediment Volume (SV) at Inspection: no change since as -built <br />Surface Water elev. 5551.8 - As Built Pond Bottom elev. 5548.0 = Water Depth 3.8 feet <br />Water Volume (WV) in Pond 2.15 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 3.99 ac -ft [As Built Pond Capacity — WV — SV] <br />Inflow volume from 10 -yr 24 -hr storm runoff event 2.7 ac -ft <br />Circle or Write appropriate Response <br />1. Seepage (specify location, color, and approx. volume) Yes <br />2. Cracks or scarps on crest or slopes Yes <br />3. <br />4. <br />5. <br />6. <br />Sloughing or bulging on slopes <br />Major erosion problems <br />Surface movements in valley bottom or on hillside <br />Water impounded against toe <br />7. Clogging <br />1.1 <br />7 <br />10. <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 Flume in place & functioning <br />Comments: Revised data from as -built <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Yes <br />Xs <br />YX <br />X <br />IN <br />Ix <br />K <br />f11� <br />IX <br />Y <br />Ix <br />No <br />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 2\Environmental\Pond Inspections & Examinations\2017_10 Annual Impoundment Inspections.doc <br />