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2016-08-08_PERMIT FILE - C1981019A (63)
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2016-08-08_PERMIT FILE - C1981019A (63)
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Last modified
4/25/2018 8:35:09 AM
Creation date
9/28/2016 9:58:44 AM
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DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
8/8/2016
Doc Name
Sedimwent Pond and Associated Modeling During Mining
Section_Exhibit Name
Volume 18 Exhibit 7 Item 23 Part C
Media Type
D
Archive
Yes
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Exhibit 7-23C, Table 1 <br />COLOWYO COAL COMPANY <br />SEDIMENTATION POND SUMMARY <br />SEDIMENTATION POND SUMMARY <br />Revision Date: 11/09/15 <br />Exh 7-23C-4 Revision No. PR -04 <br />SIDEHILL <br />SECTION 26 <br />SECTION 36 <br />MIDDLE <br />SECTION 2 <br />POND <br />POND <br />POND <br />POND <br />POND <br />WATERSHED AREA (acres): <br />Disturbed <br />00 <br />0.0 <br />1737 <br />1737 <br />1737 <br />Spoil pile areas <br />141.5 <br />2185 <br />1878 <br />2054 <br />2928 <br />Postmining Topsoiled and Seeded <br />00 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />Undisturbed <br />0.0 <br />139 <br />1420 <br />1557 <br />2407 <br />1-2 Year Reclamation <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />3+ Year Reclamation <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />00 <br />Total Area <br />141.5 <br />2324 <br />5036 <br />5348 <br />707.2 <br />POND PARAMETERS: <br />Bottom Elevation <br />7155.0 <br />6978.0 <br />7105.0 <br />7048.0 <br />68550 <br />Principal Spillway Invert Elevation <br />7170.0 <br />6993.0 <br />71180 <br />sc <br />6872.0 <br />Emergency Spillway Invert Elevation <br />7172.0 <br />6995.0 <br />7125.0 <br />7066.0 <br />6875.0 <br />Top of Embankment <br />7174.0 <br />7000.0 <br />7130.0 <br />7071.0 <br />68800 <br />Storage Volume Below Emergency Spillway Invert (ac -ft) <br />735 <br />285 <br />5.23 <br />3.49 <br />944 <br />Storage Volume Below Principal Spillway Invert (ac -ft) <br />5.88 <br />2.12 <br />1.95 <br />1.60 <br />672 <br />Storage Volume Below Lowest Spillway Perforation (ac -ft) <br />405 <br />1.52 <br />1 37 <br />0.75 <br />389 <br />Principal Spillway Parameters: <br />Type <br />Perf Riser <br />Perf Riser <br />Perf. Riser <br />Perf Riser <br />Perf. Riser <br />Riser Diameter (in) <br />18.0 <br />18.0 <br />18.0 <br />180 <br />18.0 <br />Riser Height (ft) <br />5.50 <br />13.00 <br />10.00 <br />10.00 <br />16.00 <br />Barrel Diameter (in) <br />18.0 <br />180 <br />240 <br />180 <br />240 <br />Elevation of Perforation(s) (ft) <br />71670 <br />6991.0 <br />71160 <br />7057.0 <br />6868.0 <br />Size of Perforation(s) (in) <br />3.0 <br />3.0 <br />3.0 <br />3.0 <br />30 <br />Number of Perforations <br />20 <br />2.0 <br />2.0 <br />2.0 <br />2.0 <br />Emergency Spillway Parameters: <br />Type <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Diameter (in) <br />N/A <br />N/A <br />N/A <br />N/A <br />N/A <br />Bottom Width (ft) <br />20.0 <br />20.0 <br />20 <br />20.0 <br />20.0 <br />Length (ft) <br />400 <br />20.0 <br />20.0 <br />20.0 <br />20.0 <br />Side Slopes YH.1V (ft) <br />2H:1V <br />2 5H -1V <br />2.51-1:1V <br />2H.1V <br />2H.1V <br />HYDROLOGIC/HYDRAULIC PARAMETERS: <br />Base Flow Rates (cfs) <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />000 <br />10 -Year, 24 -Hour Storm Event- <br />ventPrecipitation <br />Precipitation(in) <br />1.80 <br />1.80 <br />1.80 <br />1.80 <br />1.80 <br />Runoff Volume (ac -ft) <br />2.48 <br />3.53 <br />12.10 <br />12.55 <br />14.67 <br />Principal Spillway Peak Discharge (cfs) <br />0.79 <br />2.23 <br />2220 <br />1753 <br />14.22 <br />Emergency Spillway Peak Discharge (cfs) <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />Peak Surface Water Stage Elevation (ft) <br />7169.84 <br />6993.20 <br />7124.80 <br />7065.46 <br />6874.84 <br />100 -Year, 24 -Hour Storm Event. <br />Precipitation (in) <br />270 <br />2.70 <br />2.70 <br />270 <br />2.70 <br />Runoff Volume (ac -ft) <br />689 <br />10.68 <br />29.71 <br />31.03 <br />37.84 <br />Combined Spillway Peak Discharge (cfs) <br />10.16 <br />21.50 <br />158.70 <br />15740 <br />11820 <br />Peak Surface Water Stage Elevation (ft) <br />7171.47 <br />6995.18 <br />7126.69 <br />7067.73 <br />6876.42 <br />Pond Freeboard (ft) <br />257 <br />4.82 <br />3.31 <br />3.27 <br />3.58 <br />SEDIMENT LOADING PARAMETERS: <br />Storm Predicted Peak Settlable Concentration (ml/I) <br />000 <br />0.00 <br />898 <br />3.80 <br />0.00 <br />SEDCAD estimated Annual Sediment Loading (ac -ft) <br />0.43 <br />0.24 <br />1.31 <br />013 <br />0.52 <br />Available Sediment Storage Volume at max sediment storage El <br />4.05 <br />1.52 <br />1.37 <br />0.75 <br />3.89 <br />Maximum sediment storage elevation (ft) <br />7167.0 <br />6991.0 <br />7116.0 <br />70570 <br />68680 <br />Predicted Number of Storage Years to Gate Valve Invert <br />9 4 <br />6.3 <br />1.05 <br />5.7 <br />7.5 <br />Revision Date: 11/09/15 <br />Exh 7-23C-4 Revision No. PR -04 <br />
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