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2008-01-16_PERMIT FILE - C1994082A (6)
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2008-01-16_PERMIT FILE - C1994082A (6)
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Last modified
8/24/2016 3:21:03 PM
Creation date
1/30/2008 1:40:36 PM
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Template:
DRMS Permit Index
Permit No
C1994082A
IBM Index Class Name
Permit File
Doc Date
1/16/2008
Doc Name
Drainage and Sediment Control Plan
Section_Exhibit Name
Tab 13 Attachment 13-12
Media Type
D
Archive
Yes
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f'i-Grruu~~ 1lJJ Yoart Nline * 13-12 Drainage arrd Sediment Control Plan •6 <br />Table 13-12.5 <br />YOAST MINE <br />SEDIMENTATION POND DESIGN SUMMARY <br /> Pond 012 Pond 012A Pond 013 Pond 014 <br />WATERSHED AREA (acres): <br /> <br />Disturbed (Revegetated) 275.60 237.2 (201.3) 24.24 117.80 <br />Undisturbed 41.90 51.8 9.80 36.50 <br />Total Area 319.30 289.0 34.04 154.30 <br />POND PARAMETERS: <br /> <br />Bottom Elevation 7,226.0 7,336.0 7,355.0 7,360.0 <br />Principal Spillway Invert Elevation 7,254.5 7,344.5 7,366.0 7,385.0 <br />Emergency Spillway Invert Elevation 7,257.0 7,345.5 7,367.5 7,387.5 <br />Top of Embankment 7,260.0 7,348.0 7,370.0 7,390.0 <br /> <br />Storage Volume Below Emergency Spillway (ac-ft) 20.82 9.70 4.62 12.72 <br />Storage Volume Below Principal Spillway (ac-ft) 17.23 8.56 3.74 10.47 <br /> <br />Principal Spillway Parameters: <br />Type Perforated <br />Riser Drop Inlet Drop Inlet Drop Inlet <br />I <br />Riser Diameter (in) 30 24 12 30 <br />Riser Height (ft) 5 4.5 5 5 <br />Barrel Diameter (in) <br />Number of Holes in Riser <br />Size of Holes (in) <br />Elev. Of Holes 24 <br />3 <br />3 <br />7,252.0 24 <br />N/A 12 <br />N/A <br />- <br />- 24 <br />N/A <br />- <br />- <br /> <br />Emer enc Spillwa Parameters: <br />T pe Trapezoidal Tra ezoidal Tra ezoidal Tra ezoidal <br />Bottom Width (ft) 15 20 10 20 <br />Length (ft) 50 30 30 30 <br />Side Slopes 'z'H:1 V (ft) 3 3 3 3 <br />HYDROLOGICIHYDRAULIC PARAMETERS: <br /> <br />10-Year, 24-Hour Storm Event: <br />Precipitation (in) 1.7 1.7 1.7 1.7 <br />Runoff Volume (ac-ft) 17.11 3.08 1.98 8.96 <br />Principal Spillway Peak Discharge (cfs) 33.3 28.1 4.4 34.0 <br />Emergency Spillway Peak Discharge (cfs) 0 0 0 0 <br />Peak Surface Water Stage Elevation (ft) 7,256.5 7,344.9 7,367.4 7,387.1 <br /> <br />25-Year, 24-Hour Storm Event: <br />Precipitation (in) 2.1 2.1 2.1 2.1 <br />Runoff Volume (ac-ft) 24.40 6.16 2.79 12.36 <br />Principal Spillway Peak Discharge (cfs) N/A NIA N/A N/A <br />Emergency Spillway Peak Discharge (cfs) 117.4 27.3 22.8 84.9 <br />Peak Surface Water Stage Elevation (ft) 7,259.0 7,346.2 7,368.5 7,388.8 <br />Pond Freeboard (ft) 1.0 1.8 1.5 1.2 <br />SEDIMENT LOADING PARAMETERS: <br /> <br />Storm Predicted Peak Settlable Concentration (ml/I) 0.23 N/A 0.00 0.06 <br />Predicted Annual Sediment Loading (ac-ft) 13.84 0.10 1.49 6.08 <br />Available Sediment Storage Volume (ac-ft) 14.09 6.29 2.72 6.78 <br />Maximum Sediment Storage Elevation (ft) 7,252.0 7,343.0 7,364.0 7,380.0 <br />Predicted Number of Storage Years 1.0 60 1.8 1.1 <br />11nut~oiunr7~ I (%'at.ron [llznru~g Gronf~ * 165 S. Union Bordevm~! Snite 460 * Lakewood, Colorado 80228 * (303) 763-5140 <br />• <br /> <br />• <br />'I'R-3G Re~>ised 08/07 <br />
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