PERMFILE58181

• Permit No: C1982055A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: ADDENDUM D DRAINAGE AND SEDIMENT CONTROL INFORMATION
• Media Type: D
• Archive: Yes

ENERGY FUELS
CALCULATED SEDIMENT YIELD
RATON CREEK MINE
• SOIL ERODIBILITY FACTOR:
Sa'~ Type eca~tnliry
Facior.K
Sandy Loom 0 32
TOTAL
SLOPE FACFOR:
~~.v d~ . 7
1
Length Elevation Slope m Slape LS
Change Angle Fpcta
(h) (h) (%) (deg)
d2 Id 3J 3% 0.6 10.4 3.47
the LS Factor was calcNaled by
L5=(Slope Length/726)^m'(10.8Sm(slope angle)+DOJ) for 5/oPes<9%
LS= (Slope Lenglh,026)^m'(l6.8'sm(slope angle) - D.5) for Siopes> 9%
Where'
• Sbpe <3% m=DJ UI
Slo e=d% m=D.4 C
5%~S/ope<10% m=05 3Z'~~ (.D
Slape>lD% m.D.6
COVER AND PRACTICE FACTORS: ~`AF~~
Cover Cavei Canopy Cover ractice
Type Factor. C Faclor.P
L%) C%)

Reclaimetl (Post-Law) 50% 0% 0 07 0 80
TOTAL:
RAINFALL FACTOR:
R=7o
GRO55 SEDIMENT YIELD
//a' r 1
the following spreodsneet calculates the predicted sediment y~zld for the pro/act area. the gross sadimenl geld
is determined occordmg to the Revised Universal Sail Loss Equolion.
PARAMETER DESCRIPTION VALUE
Annual Rainfall Factor 76.00 ~ ./,I
Soil ErotllblFdy Factor 0.92 5V.'!_~
Lengm Slope Factor 3.47 1,~+
Cover Factor 0.07 ~ I~ ~1_
• Practlce FOCfOr 0.00 ^_ r
Gross Annual Sediment Yield 4 72 Eons/acre/year 'Y