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2017 ANNUAL IMPOUNDMENT INSPECTION <br />Mine: New Horizon 2 Mine <br />Pond Name: Pond 016 <br />NPDES Permit & Outfall #s: CO -0000213 <br />Date Inspected: 24 -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 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.: 5620.5 Surveyed Pond Bottom elev.: 5611.0 <br />As Built Pond Emergency Spillway elev.: 5618.5 As Built Pond Primary Spillway elev.: NA <br />As Built Pond Capacity (pond bottom to emergency spillway) per As Built 7.5 ac -ft <br />Existing Pond Capacity (pond bottom to emergency spillway): As Built Volume - SV = 7.5 ac -ft note <br />Sediment Volume (SV) at Inspection: length ft X width ft X depth ft = NA ac -ft <br />Surface Water elev. Dry - As Built Pond Bottom elev. 5611.0 = Water Depth NA <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 7.5 ac -ft [As Built Pond Capacity — WV — SV] <br />Inflow volume from 100 -yr 24 -hr storm runoff event 5.33 ac -ft <br />Note: Sediment volume about equal to settling. <br />Circle or Write appropriate Response <br />1. Seepage (specify location, color, and approx. volume) <br />Yes <br />tX <br />N/A <br />2. Cracks or scarps on crest or slopes <br />Yes <br />IM <br />N/A <br />3. Sloughing or bulging on slopes <br />Yes <br />IX <br />N/A <br />4. Major erosion problems <br />Yes <br />IM <br />N/A <br />5. Surface movements in valley bottom or on hillside <br />Yes <br />NX <br />N/A <br />6. Water impounded against toe <br />Yes <br />No <br />N/A <br />7. Clogging <br />a) Spillway channels and pipes <br />Yes <br />N/A <br />b) Decant system <br />Yes <br />No <br />W <br />C) Diversion Ditches <br />Yes <br />N/A <br />8. Cracking or crushing of pipes <br />a) Spillway pipes <br />Yes <br />No <br />'lt' <br />b) Decant system <br />Yes <br />No <br />i <br />9. Trash racks clear and in place <br />Yes <br />No <br />I <br />10. Monitoring instrumentation <br />Yes <br />No <br />i <br />Comments: The pond floor has settled and some sediment has accumulated at the southeast entrance. <br />M:\New Horizon 2\Environmental\Pond Inspections & Examinations\2017_10 Annual Impoundment Inspections.doc <br />