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., <br />TABLE 6 ,r;: <br />,,, ~ ~ ~~ , ~ ~: ~" "~ ~.".~ SEDIMENTATION'POND DESIGN SUMMARY ~ ~ ~ "' ~ ' <br /> Streeter <br />Pond 001A Work Area <br />Pond 002A <br />" Gosserd <br />Pond" <br />003A Gulch A <br />Pond <br />004A Stoker Rail Loop <br />Siding Pand Pond OO6A <br />005A Prospect <br />Pond 007A West Pit <br />Pand 008A Section 16 <br />Pond 009A Eest Taylor <br />Pond 010A Taylor <br />Pump Pond <br />Watershed Area (acres) <br />Disturbed 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 N/A <br />Postmining <br />To soiled/Seeded <br />139.5 <br />108.3 <br />25.9 <br />36.4 <br />14.5 <br />5.7 <br />57.6 <br />60.9 <br />17.6 <br />188.5 N/A <br />Postminin Undisturbed 117.8 13.2 0.0 69.7 0.0 0.~0 198.2 23.8 53.7 250.0 N/A <br />1-2 Year Reclamation 335.0 0.0 0.0 46.2 0.0 0.0 227.2 0.0 47.7 74.6 N/A <br />3+ Year Reclamation 745.0 O.O O.0 565.8 0.0 0.0 229.7 151.2 146.4 535.2 N/A <br />TOTAL AREA 1337.2 121.4 25.9 718.1 14.5 5.7 712.5 235.9 265.5 1048.2 N/A <br />H drolo is/H draulic Parame ters <br />Base Flow Rate Icfsl 0.15 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 Variable <br /> <br />10-yr, 24-hr Storm Event <br />Preci itation IiN 1.8 1.8 7.8 1.8 1.8 1.8 1.8 1.8 1.8 1.8 N/A <br />Runoff Volume lac-ftl 5.0 5.2 1.5 0.9 0.9 0.3 2.0 2.3 0.4 7.3 N/A <br />Principal Spillway Peak <br />Dischar a (cfsl <br />3.1 <br />1.4 <br />1.4 <br />0.4 <br />0.6 <br />0:1 <br />1.1 <br />1.3 <br />0.4 <br />2.2 <br />N/A <br />Emergency Spillway <br />Peak Dischar a (cfs) <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />N/A <br />Peak Sta a Elev. Iftl 6585.7 7155.2 6390.2 6616.2 6326.9 6351.!3 6745.7 6831.0 7746.2 6950.7 N/A <br /> <br />25- r, 24-hr Storm Event <br />Preci itation lint 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 2.3 N/A <br />Runoff Volume lac-ft) 15.1 8.5 2.3 4.7 1.3 0.!5 6.3 4.8 1.9 15.7 N/A <br />Principal Spillway Peak <br />Dischar a (cfsl <br />6.6 <br />1.9 <br />1.5 <br />2.7 <br />0.7 <br />O.G <br />2.4 <br />1.9 <br />1.1 <br />10.1 N/A <br />Emergency Spillway <br />Peak Dischar a (cfs) <br />1.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />0.0 <br />N/A <br />Peak Sta a Elev. (ftl 6588.0 7156.0 6390.9 6618.0 6327.9 6352.:? 6750.7 6832.4 7747.6 6953.4 N/A <br />Pond Freeboard Iftl 3.0 4.0 10.0 3.0 6.1 2.B 4.4 8.6 8.4 2.6 N/A <br />Sediment Loadin Parameter s <br />Predicted Peak Settleable <br />Concentration ml/p <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />N/A <br />Predicted Annual <br />Sediment Loadin lac-ftl <br />0.33 <br />0.12 <br />0.04 <br />0.17 <br />0.01 <br />0.02 <br />0.53 <br />0.24 <br />0.12 <br />0.90 <br />N/A <br />Available Sediment <br />Stora a Volume lac-ftl <br />0.84 <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 />2.13 <br />N/A <br />Maximum Sediment <br />Stora a Elevation lac-ftl <br />6581.3 <br />7150.7 <br />6388.3 <br />6614.0 <br />6323.9 <br />6351.!i <br />6741.6 <br />6825.4 <br />7743.7 <br />6942.0 <br />N/A <br />Predicted Years Stora a 2.5 40.2 26.6 17.2 28.4 45.0 2.7 9.0 4.7 2.4 N/A <br />Pond Desi n Parameters <br />Bottom Elev. Iftl 6578.0 7146.0 6384.9 6605.0 6321.8 6344.() 6734.0 6821.0 7740.2 6930.0 6549.0 <br />Principal Spillway Invert <br />Elev. Iftl <br />6585.0 <br />7155.8 <br />6391.0 <br />6617.5 <br />6329.6 <br />6357.!i <br />6750.3 <br />6837.0 <br />7752.9 <br />6952.0 <br />N/A <br />Emergency Spillway <br />Invert Elev. Iftl <br />6588.0 <br />7158.0 <br />6392.7 <br />6619.2 <br />6332.0 <br />6353.() <br />6752.0 <br />6838.0 <br />7754.5 <br />6954.0 <br />6555.0 <br />Top of Embankment <br />Elev. Iftl <br />6591.0 <br />7160.0 <br />6400.9 <br />6627.0 <br />6334.0 <br />6355.() <br />6755.0 <br />6841.0 <br />7756.0 <br />6956.0 <br />6556.0 <br /> <br />Storage Volume Below <br />Emergency Spillway <br />lac-ftl <br /> <br />11.2 <br /> <br />23.2 <br /> <br />4.3 <br /> <br />6.7 <br /> <br />3.2 <br /> <br />1.!i <br /> <br />6.1 <br /> <br />13.8 <br /> <br />5.4 <br /> <br />9.1 <br /> <br />1.8 <br />Storage Volume Below <br />Principal Spillway lac- <br />ftl <br />5.2 <br />17.0 <br />3.0 <br />5.7 <br />1.9 <br />1.0 <br />5.1 <br />12.6 <br />4.4 <br />7.5 <br />N/A <br /> <br />Princi al S illwa <br />Type Perf. Riser Perf. Riser Fixed <br />Si hon Perf. Riser Perf. Riser Trickle <br />Tube Perf. Riser Perf. Riser Perf. Riser Perf. Riser N/A <br />Riser Diameter lint 12.0 12.0 N/A 12.0 12.0 N/A 12.0 78.0 12.0 78.0 N/A <br />Riser Hei ht Iftl 3.7 5.1 N/A 3.5 5.7 N/E. 8.7 11.6 9.2 10.0 N/A <br />Barrel Diameter lin) 18.0 12.0 6.0 12.0 12.0 8.0 12.0 18.0 12.0 1 B.0 N/A <br />Elev. of Perforations Ift) 6583.0 7154.0 N/A 6615.5 6325.0 N/F~ 6744.0 6830.0 7746.0 6944.0 N/A <br />Size of Perforations lint 4.0 4.0 N/A 3.0 4.0 N/F~ 4.0 4.0 4.0 4.0 N/A <br />Number of Perforations 2.0 3.0 N/A 2.0 1.0 N/F~ 2.0 3.0 2.0 2.0 N/A <br /> <br />Emer enc S illwe <br />Type Trapezoidal Trapezoidal Trickle <br />Tube Trapezoid <br />al Trapezoidal Trapezoidal Trapezoidal Trapezoidal Trapezoidal Trapezoidal Trapezoidal <br />Diameter (in) N/A N/A 30.0 N/A N/A N/F. N!A N/A N/A N/A N/A <br />De th Iftl 3.0 2.0 8.2 1.8 2.0 2.(I 3.0 3.0 7.5 2.0 1.0 <br />Bottom Width Iftl 20.0 15.0 N/A 15.0 5.0 7.(l 12.0 24.0 19.0 20.0 40.0 <br />To Len th Iftl 50.0 140.0 155.0 30.0 40.0 15.0 20.0 21.0 17.0 20.0 80.0 <br />Sideslopes 1.5:1 1.5:1 N/A 7.5:1 2:1 2:1 1.5:1 7.5:1 2:1 2:1 1.5:1 <br />Exhibit 7 8 Revision Date 10/23/03 <br />Revision No. TR-56 <br />