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• <br />TABLE 4.4 - 8 SEDIMENT POND - SEDIMENT CAPACITY CALCULATIONS <br />The area around the mine site, D~1, must be broken into smaller areas to reflect the diverse conditions. <br /> <br />LBasin 1 Description ~ (acres) ~ ~Vegetaticn (°h) ~ Litter (°h) ~ Cover ) <br />UNDISTURBED AREA <br />C - 1a Narth UndisNrbed 1.78 510 Shadscale ~ 50%Veg Cover 10 60 <br />C - 2a __ <br />North Undisturbed 0.36 200 Shadscale Ld 50°h Veg Cover 10 60 <br />C - 3a Main Drainage -East of Mine 1.23 240 Juniper ~ 20°.6 Veg Cover 23 43 <br />C - 4a South of McClave Fan Portal 1.31 590 Juniper ~ >45°h Veg Cover 23 68 <br />C - Sa South of Mine Sde 1.32 350 Juniper -Heavy > 45 °h 23 68 <br /> <br />DISTURBED ARFA <br />D -1a Upper mine bench 8 Coa! Yard 1.13 520 None 5 0 <br />D -1 b Lower Mine Bench 1.64 300 None 5 0 <br />D - 2 East of 2ND Gate So. of Road 2.16 600 Juniper -Reduce Veg Cover to 30 ° 23 53 <br />D - 3 North East of Sediment Pond 4.24 930 Juniper -Reduce Veg Cover to 30 ° 23 53 <br />D - 4 Future area West of Ri Ra 6.80 GW & SS -Reduce Ve Cover to 1 5 15 <br /> R K L H S LS "' CP DR Tn/adyr Tons per <br />Basin Rainfall Erodibil~ Length Height Sloe Factor Control Deliv. Ratio ear <br />UNDISTl1RRFD ARFA <br />C - to 20 0.20 510 370 72.55°,6 20.00 0.35 0.7 19.6 34.92 <br />C - 2a 20 0.20 200 130 65.00°.6 20.00 0.35 0.7 19.8 6.97 <br />C - 3a 20 0.20 240 120 50.00°.G 20.00 0.20 0.7 11.2 13.78 <br />C - 4a 20 0.20 590 220 3729% 20.00 0.05 0.7 2.8 3.66 <br />C - Sa 20 D.2D 350 tOD 28.57% 15.OD 0.05 0.7 2.1 2.77 <br /> <br />DIRTIIRRFD ARFA <br />D - 1a 20 0.30 520 55 10.58°b 3.40 1.20 1 24.48 27.59 <br />D - 1 b 20 0.30 300 45 15.00°.6 4.30 1.40 1 36.12 59.37 <br />D - 2 20 0.20 600 165 30.83°,6 14.00 0.10 1 5.6 12.07 <br />D - 3 20 0.20 930 175 18.82°~ 11.00 0.10 1 4.4 18.64 <br />D - 4 20 0.20 900 55 6.11 °.6 2.00 1.40 1 11.2 76.16 <br />TOTAL 255.93 <br />Total W/O D - 4 179.774 <br />Volume of Sediment Delivered Aue Feet Cubic Feet 5 Yr Total <br />VS = Ys (20001b/ton)(1Acre) Volume W/O D - 4 D.106 4809.6 0.529 <br />1.25(62.4 Ibkuft)(43,560) Volume With D - 4 0.151 6562.4 0.753 <br />'Baseline Vegetation Data From Table 4.5-26 <br />- From Applied Hydrology..., Barteild..., Fg 5.15 <br />me vot t <br />Page 1 <br />1.99 <br />