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2013-04-25_PERMIT FILE - C1981019A
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2013-04-25_PERMIT FILE - C1981019A
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Last modified
8/24/2016 5:19:49 PM
Creation date
5/14/2013 2:36:13 PM
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DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
4/25/2013
Section_Exhibit Name
Exhibit 07 Methodologies & Assumptions for Sedimentation Pond Design Evaluations
Media Type
D
Archive
Yes
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TABLE 6 <br />COLOWYO COAL COMPANY <br />SEDIMENTATION POND SUMMARY PROPOSED PLAN <br />REVISED: December. 2010 <br />TR -81 TR -81 TR -81 <br />Revision Date: 3118113 <br />Exhibit 7 Page 10 Revision No: TR -95 <br />010A <br />010A <br />001A <br />002A <br />003A <br />004A <br />005A <br />006A <br />007A <br />008A <br />009A <br />EAST TAYLOR <br />EAST TAYLOR <br />STREETER <br />WORK AREA <br />GOSSARD <br />GULCH A <br />STOKER SIDING <br />RAIL LOOP <br />PROSPECT <br />WEST PIT <br />SECTION 16 <br />POND <br />POND <br />POND <br />POND <br />POND <br />POND <br />POND <br />POND <br />POND <br />POND <br />POND <br />Active Mining <br />Post Mining <br />WATERSHED AREA (acres): <br />Disturbed <br />00 <br />0.0 <br />00 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />00 <br />00 <br />0.0 <br />0.0 <br />Postmining Topsoiled and Seeded <br />117.4 <br />108.3 <br />25.9 <br />364 <br />145 <br />57 <br />1038 <br />87.5 <br />24.7 <br />358 <br />00 <br />Undisturbed <br />148.1 <br />13.2 <br />0.0 <br />697 <br />0.0 <br />0.0 <br />236.8 <br />232 <br />36.6 <br />27.4 <br />48.9 <br />1 -2 Year Reclamation <br />3058 <br />0.0 <br />0.0 <br />46.2 <br />0.0 <br />00 <br />231 4 <br />0.0 <br />291 <br />79.9 <br />433.7 <br />3+ Year Reclamation <br />737.2 <br />0.0 <br />0.0 <br />5658 <br />0.0 <br />0.0 <br />128.9 <br />888 <br />194.9 <br />332.4 <br />6805 <br />Total Area <br />13085 <br />1214 <br />25.9 <br />7181 <br />14.5 <br />5.7 <br />701.0 <br />199.5 <br />285.3 <br />475.5 <br />1163.1 <br />POND PARAMETERS: <br />Bottom Elevation <br />6578.0 <br />7146.0 <br />6384.9 <br />66050 <br />6321 8 <br />6344.0 <br />6734.0 <br />6821.0 <br />7740.2 <br />69300 <br />6930.0 <br />Principal Spillway Invert Elevation <br />6585.0 <br />7155.8 <br />6391.0 <br />6617.5 <br />63296 <br />6351 5 <br />67503 <br />68370 <br />7752.9 <br />6952.0 <br />69510 <br />Emergency Spillway Invert Elevation <br />6588.0 <br />7158.0 <br />63927 <br />66192 <br />6332.0 <br />6353.0 <br />6752.0 <br />6838.0 <br />77545 <br />6954.0 <br />69535 <br />Top of Embankment <br />6591.0 <br />7160.0 <br />6400.9 <br />6621.0 <br />6334.0 <br />63550 <br />67550 <br />6841.0 <br />7756.0 <br />69560 <br />69560 <br />Storage Volume Below Emergency Spillway Invert (ac -ft) <br />112 <br />232 <br />43 <br />6.7 <br />3.2 <br />1.5 <br />6.1 <br />138 <br />54 <br />9.1 <br />8.6 <br />Storage Volume Below Principal Spillway Invert (ac -ft) <br />5.2 <br />17.0 <br />3.0 <br />5.7 <br />19 <br />10 <br />51 <br />12.6 <br />4.4 <br />7.5 <br />67 <br />Storage Volume Below Lowest Spillway Perforation (ac -ft) <br />263 <br />12.33 <br />N/A <br />382 <br />0.38 <br />N/A <br />2.25 <br />5.50 <br />0.00 <br />2.85 <br />285 <br />Principal Spillway Parameters <br />Type <br />Perf Riser <br />Perf. Riser <br />Fixed Siphon <br />Perf. Riser <br />Perf. Riser <br />Trickle Tube <br />Perf Riser <br />Perf Riser <br />Perf. Riser <br />Perf. Riser <br />Perf. Riser <br />Riser Diameter (in) <br />12.0 <br />12.0 <br />N/A <br />120 <br />12.0 <br />N/A <br />12.0 <br />18.0 <br />120 <br />180 <br />18.0 <br />Riser Height (ft) <br />37 <br />5.1 <br />N/A <br />3.5 <br />5.7 <br />N/A <br />8.7 <br />116 <br />9.2 <br />10.0 <br />10.0 <br />Barrel Diameter (in) <br />18.0 <br />12.0 <br />6.0 <br />120 <br />120 <br />80 <br />12.0 <br />180 <br />120 <br />18.0 <br />18.0 <br />Elevation of Perforation(s) (ft) <br />65830 <br />7154.0 <br />N/A <br />66155 <br />6325.0 <br />N/A <br />6744.0 <br />68300 <br />77460 <br />6944.0 <br />69440 <br />Size of Perforation(s) (in) <br />4.0 <br />4.0 <br />N/A <br />3.0 <br />4.0 <br />N/A <br />40 <br />4.0 <br />4.0 <br />4.0 <br />4.0 <br />Number of Perforations <br />20 <br />3.0 <br />N/A <br />20 <br />1.0 <br />N/A <br />2.0 <br />30 <br />20 <br />2.0 <br />2.0 <br />Emergency Spillway Parameters: <br />Type <br />Trapezoidal <br />Trapezoidal <br />Trickle Tube <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Trapezoidal <br />Diameter (in) <br />N/A <br />N/A <br />30.0 <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 />Bottom Width (ft) <br />200 <br />150 <br />N/A <br />150 <br />5.0 <br />7.0 <br />120 <br />240 <br />19.0 <br />20.0 <br />20.0 <br />Length (ft) <br />50.0 <br />140.0 <br />155.0 <br />30.0 <br />40.0 <br />15.0 <br />200 <br />21.0 <br />17.0 <br />200 <br />20.0 <br />Side Slopes'z'H.1V (ft) <br />1.5 <br />1.5 <br />N/A <br />1.5 <br />20 <br />20 <br />1 5 <br />1.5 <br />2.0 <br />2.0 <br />2.0 <br />HYDROLOGIC /HYDRAULIC PARAMETERS: <br />Base Flow Rates (cfs) <br />0.15 <br />000 <br />000 <br />0.00 <br />0.00 <br />0.00 <br />0.15 <br />003 <br />000 <br />0.00 <br />000 <br />10 -Year, 24 -Hour Storm Event. <br />Precipitation (in) <br />1.80 <br />1.80 <br />1.80 <br />1.80 <br />1 80 <br />1 80 <br />1.80 <br />1.80 <br />1 8 <br />1.80 <br />1.80 <br />Runoff Volume (ac -ft) <br />475 <br />5.19 <br />1.51 <br />0.88 <br />0.85 <br />0.33 <br />320 <br />3.50 <br />5.03 <br />9.66 <br />1430 <br />Principal Spillway Peak Discharge (cfs) <br />1.60 <br />1.36 <br />1.40 <br />0.38 <br />058 <br />0.45 <br />1 46 <br />1.65 <br />2.08 <br />690 <br />11.88 <br />Emergency Spillway Peak Discharge (cfs) <br />0.00 <br />0.00 <br />0.00 <br />000 <br />0.00 <br />0.00 <br />0.00 <br />000 <br />0 <br />000 <br />000 <br />Peak Surface Water Stage Elevation (ft) <br />658514 <br />7155.17 <br />6390.15 <br />6616.17 <br />6326.94 <br />6351 93 <br />674701 <br />6831.71 <br />7753.35 <br />695277 <br />6952.95 <br />25 -Year, 24 -Hour Storm Event: <br />Precipitation (in) <br />2.30 <br />230 <br />230 <br />230 <br />230 <br />2.30 <br />2.30 <br />230 <br />2.30 <br />2.30 <br />2.30 <br />Runoff Volume (ac -ft) <br />14.04 <br />851 <br />2.34 <br />4.68 <br />1.31 <br />051 <br />829 <br />6.47 <br />9.44 <br />1797 <br />3370 <br />Principal Spillway Peak Discharge (cfs) <br />5.68 <br />1.88 <br />1.53 <br />275 <br />072 <br />0.62 <br />4.00 <br />2.38 <br />505 <br />14.00 <br />1627 <br />Emergency Spillway Peak Discharge (cfs) <br />000 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />000 <br />000 <br />0.00 <br />535 <br />2540 <br />6530 <br />Peak Surface Water Stage Elevation (ft) <br />658727 <br />715604 <br />6390.94 <br />6618.03 <br />6327.91 <br />6352.19 <br />6751.43 <br />6833.57 <br />7754.77 <br />695474 <br />6954.66 <br />Pond Freeboard (ft) <br />373 <br />396 <br />9.96 <br />2.97 <br />6.09 <br />281 <br />357 <br />7.43 <br />1.23 <br />1.26 <br />1 34 <br />SEDIMENT LOADING PARAMETERS: <br />Storm Predicted Peak Settlable Concentration (ml /1) <br />001 <br />0.00 <br />000 <br />0.00 <br />000 <br />0.00 <br />0.00 <br />000 <br />0.00 <br />0.00 <br />000 <br />SEDCAD estimated Annual Sediment Loading (ac -ft) <br />1.30 <br />0.12 <br />0.04 <br />0.17 <br />001 <br />0.02 <br />1.91 <br />049 <br />005 <br />009 <br />0.003 <br />Available Sediment Storage Volume at max. sediment storage El (ac -ft) <br />084 <br />4.86 <br />1.17 <br />2.85 <br />0.20 <br />1.03 <br />1.41 <br />2.18 <br />0.56 <br />043 <br />043 <br />Maximum sediment storage elevation (ft) <br />6581 3 <br />7150.7 <br />6388.3 <br />6614.0 <br />63239 <br />6351.5 <br />6741.6 <br />6825.4 <br />774370 <br />6935.00 <br />6935.00 <br />Predicted Number of Storage Years to Gate Valve Invert <br />1 06 <br />40.2 <br />26.6 <br />17.2 <br />28.4 <br />45.0 <br />07 <br />1 4.4 <br />1 11.2 <br />1 4.6 <br />1 > 20 <br />Revision Date: 3118113 <br />Exhibit 7 Page 10 Revision No: TR -95 <br />
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