PERMFILE132678

• Permit No: C1996083A
• IBM Index Class Name: Permit File
• Doc Date: 1/15/2002
• Doc Name: pages Exh 8-1-Exh 8-80i
• Section_Exhibit Name: Exhibit 08 Protection of the Hydrologic Balance
• Media Type: D
• Archive: Yes

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Pond A
Sediment Pond A was initially designed to collect the sediment from the mine facilities area
However, because of stability concerns, Pond A was deleted from the design.
RUN-OFF VOLUME - -Pond B
Precip Direct Run-off
Area Acres Ctuve # Amount Run-off Vol A-F
Disturbed 40.0 87.6 I.8 0.78 2.62
Previously Dist 3.9 74 1.8 0.26 0.08
Mixed Shrub 56.7 41 l.8 0.00 0.00
Dry Mixed Shrub 17.58 57 1.8 0.01 0.02
Juniper Woodland 30.5 61 1.8 0.04 0.10
Wetland 1.68 89 1.8 0.86 0.12
Sagebrush 0.15 63 1.8 0.06 0.00
Upper Meadow 0.00 74 1.8 0.26 0.00
Lower Meadow 0.2 74 1.8 0.26 0.00
TOTAL
150.7
TOTAL REQUIRED WATER VOLUME - - A-F
SEDIMENT VOLUME -Pond B
Use the universal soil loss equation.
2.94
2.94
The Topographic Factor LS is difficult to evaluate for a steep mountainous drainage azea.
According to the LS factor table, when the length of slope exceeds 400 feet and or percent
slope exceeds 24 percent, soil loss estimates are speculative as these values are beyond the
range of research data. Therefore, an LS factor using 400 feet and 24 percent will be used for
this calculation.
SEDIMENT VOLUME -Pond B
1
2
3
4
5
6
7
8
PR-03
Calculate Weighted Average C-Factor
Area Acres % Canopy % Cover C-Factor Extended
Disturbed* 40.0 0.0 0.0 0.1800 7.200
Previously Dist 3.9 0.0 10.0 0.3250 1.268
Mixed Shrub 56.7 Sb.9 92.6 0.0046 0.261
Dry Mixed Shrub 17.58 20,0 40.0 0.1000 1.758
Juniper Woodland 30.5 28,2 85.2 0.0100 0.305
Wetland 1.68 0.0 50.0 0.0710 0.119
Sage 0.15 0.0 78.0 0.0160 0.002
Meadow 0.2 0.0 88.4 0.0074 0.001
TOTAL 150.7
* One ton per acre mulch.
EXH-8 -6 -
Wt. Ave. 0.072
Sl99