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2015-09-09_PERMIT FILE - C1981019A (16)
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2015-09-09_PERMIT FILE - C1981019A (16)
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Last modified
5/29/2019 10:42:26 AM
Creation date
10/23/2015 8:50:22 AM
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DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
9/9/2015
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 />RF%AQg:n• Aunuaf 4d 9AIr TR -1n5 TR -81 TR -105 TR -105 <br />Revision Date: 8/22/15 <br />Exhibit 7 Page 10 Revision No.: TR -105 <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 />0.0 <br />00 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />00 <br />0.0 <br />00 <br />0.0 <br />Postmining Topsoiled and Seeded <br />310.8 <br />108.3 <br />259 <br />36.4 <br />14.5 <br />5.7 <br />1038 <br />87.5 <br />24.7 <br />106.2 <br />82.2 <br />Undisturbed <br />1362 <br />13.2 <br />0.0 <br />697 <br />00 <br />0.0 <br />236.8 <br />23.2 <br />36.6 <br />49 8 <br />70.4 <br />1-2 Year Reclamation <br />1099 <br />0.0 <br />0.0 <br />46.2 <br />0.0 <br />0.0 <br />231.4 <br />0.0 <br />291 <br />76.6 <br />166.2 <br />3+ Year Reclamation <br />821.2 <br />0.0 <br />0.0 <br />5658 <br />0.0 <br />00 <br />128.9 <br />888 <br />194.9 <br />418.3 <br />757.5 <br />Total Area <br />1378.1 <br />121.4 <br />25.9 <br />718.1 <br />14.5 <br />57 <br />7010 <br />199.5 <br />2853 <br />650.9 <br />1076.3 <br />POND PARAMETERS: <br />Bottom Elevation <br />65780 <br />7146.0 <br />63849 <br />6605.0 <br />6321 8 <br />6344.0 <br />67340 <br />6821 0 <br />7740.2 <br />6930.0 <br />6930.0 <br />Principal Spillway Invert Elevation <br />6585.0 <br />7155.8 <br />6391.0 <br />66175 <br />6329.6 <br />6351.5 <br />6750.3 <br />6837.0 <br />7752.9 <br />6952.0 <br />6951.0 <br />Emergency Spillway Invert Elevation <br />6588.0 <br />7158.0 <br />63927 <br />6619.2 <br />6332.0 <br />6353.0 <br />6752.0 <br />6838.0 <br />7754.5 <br />6954.0 <br />69535 <br />Top of Embankment <br />6591.0 <br />7160.0 <br />64009 <br />6621.0 <br />6334.0 <br />6355.0 <br />67550 <br />6841.0 <br />77560 <br />6956.0 <br />6956.0 <br />Storage Volume Below Emergency Spillway Invert (ac -ft) <br />11.2 <br />232 <br />4.3 <br />6.7 <br />3.2 <br />1.5 <br />6.1 <br />138 <br />5.4 <br />9.1 <br />8.6 <br />Storage Volume Below Principal Spillway Invert (ac -ft) <br />52 <br />17.0 <br />30 <br />5.7 <br />1.9 <br />10 <br />5.1 <br />12.6 <br />4.4 <br />75 <br />6.7 <br />Storage Volume Below Lowest Spillway Perforation (ac -ft) <br />2.63 <br />12.33 <br />N/A <br />3.82 <br />038 <br />N/A <br />2.25 <br />550 <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 />Pert. Riser <br />Trickle Tube <br />Pert. 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 />12.0 <br />12.0 <br />N/A <br />12.0 <br />180 <br />12.0 <br />18.0 <br />18.0 <br />Riser Height (ft) <br />3.7 <br />5.1 <br />N/A <br />35 <br />5.7 <br />N/A <br />8.7 <br />11.6 <br />9.2 <br />10.0 <br />10.0 <br />Barrel Diameter (in) <br />180 <br />120 <br />6.0 <br />12.0 <br />120 <br />80 <br />120 <br />18.0 <br />12.0 <br />18.0 <br />18.0 <br />Elevation of Perforation(s) (ft) <br />6583.0 <br />7154.0 <br />N/A <br />6615.5 <br />6325.0 <br />N/A <br />67440 <br />6830.0 <br />7746.0 <br />6944.0 <br />6944.0 <br />Size of Perforation(s) (in) <br />4.0 <br />4.0 <br />N/A <br />3.0 <br />40 <br />N/A <br />4.0 <br />4.0 <br />4.0 <br />4.0 <br />4.0 <br />Number of Perforations <br />2.0 <br />3.0 <br />N/A <br />20 <br />1.0 <br />N/A <br />2.0 <br />3.0 <br />2.0 <br />20 <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 />300 <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 />20.0 <br />15.0 <br />N/A <br />15.0 <br />5.0 <br />7.0 <br />12.0 <br />24.0 <br />19.0 <br />20.0 <br />20.0 <br />Length (ft) <br />50.0 <br />140.0 <br />155.0 <br />300 <br />40.0 <br />150 <br />20.0 <br />21.0 <br />170 <br />20.0 <br />20.0 <br />Side Slopes'z'H-1V (ft) <br />1.5 <br />15 <br />N/A <br />1.5 <br />20 <br />2.0 <br />1.5 <br />1.5 <br />20 <br />20 <br />2.0 <br />HYDROLOGIC/HYDRAULIC PARAMETERS: <br />Base Flow Rates (cfs) <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />000 <br />0.00 <br />015 <br />0.03 <br />0.00 <br />0.00 <br />0.00 <br />10 -Year, 24 -Hour Storm Event: <br />Precipitation (in) <br />1.80 <br />1.80 <br />1.80 <br />180 <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 />6.11 <br />5.19 <br />1 51 <br />0.88 <br />0.85 <br />0.33 <br />3.20 <br />3.50 <br />5.03 <br />5.99 <br />7.27 <br />Principal Spillway Peak Discharge (cfs) <br />3.08 <br />1.36 <br />1.40 <br />0.38 <br />058 <br />0.45 <br />1.46 <br />1.65 <br />2.08 <br />2.29 <br />244 <br />Emergency Spillway Peak Discharge (cfs) <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />000 <br />0.00 <br />0.00 <br />0 <br />0.00 <br />0.00 <br />Peak Surface Water Stage Elevation (ft) <br />6585.68 <br />7155.17 <br />6390.15 <br />6616.17 <br />632694 <br />6351.93 <br />6747.01 <br />6831.71 <br />7753.35 <br />6951.03 <br />6952.40 <br />25 -Year, 24 -Hour Storm Event - <br />Precipitation (in) <br />230 <br />2.30 <br />2.30 <br />230 <br />2.30 <br />2.30 <br />2.30 <br />2.30 <br />230 <br />2.30 <br />2.30 <br />Runoff Volume (ac -ft) <br />22.77 <br />8.51 <br />2.34 <br />4.68 <br />1 31 <br />0.51 <br />8.29 <br />6.47 <br />9.44 <br />1283 <br />18.48 <br />Combined Principal and Emergency Spillway Peak Discharge (cfs) <br />21.03 <br />1.88 <br />1 53 <br />2.75 <br />0.72 <br />0.62 <br />4.00 <br />2.38 <br />5.05 <br />11.41 <br />81.57 <br />Peak Surface Water Stage Elevation (ft) <br />6588.38 <br />7156.04 <br />639094 <br />6618.03 <br />632791 <br />635219 <br />675143 <br />6833.57 <br />7754.77 <br />6954.56 <br />6954.69 <br />Pond Freeboard (ft) <br />2.62 <br />3.96 <br />9.96 <br />2.97 <br />6.09 <br />2.81 <br />3.57 <br />743 <br />1.23 <br />1.44 <br />1.31 <br />SEDIMENT LOADING PARAMETERS: <br />Storm Predicted Peak Settlable Concentration (mIA) <br />0.04 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />000 <br />0.00 <br />000 <br />0.00 <br />0.00 <br />SEDCAD estimated Annual Sediment Loading (ac -ft) <br />0.00 <br />0.12 <br />0.04 <br />0.17 <br />0.01 <br />002 <br />1.91 <br />049 <br />005 <br />0.21 <br />0.020 <br />Available Sediment Storage Volume at max sediment storage EI (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 />0.43 <br />0.43 <br />Maximum sediment storage elevation (ft) <br />6581.3 <br />7150.7 <br />6388.3 <br />6614.0 <br />6323.9 <br />6351.5 <br />6741.6 <br />6825.4 <br />7743.70 <br />6935.00 <br />6935.00 <br />Predicted Number of Storage Years to Gate Valve Invert <br />> 50 <br />40.2 <br />26.6 <br />17.2 <br />28.4 <br />45.0 <br />0.7 <br />4.4 <br />112 <br />2.0 <br />218 <br />Revision Date: 8/22/15 <br />Exhibit 7 Page 10 Revision No.: TR -105 <br />
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