PERMFILE118814

• Permit No: C1981033
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 25 Bear 1 & 2 Reclamation Plan
• Media Type: D
• Archive: No

•
EXHIBIT 25
Where: Z = Elevation difference between high and low
point of watershed.
DA = Watershed area in square feet.
LC 25 = length of the contour at 25~ of the watershed
height (Z).
LC 50 = length of the contour at 50$ of the watershed
height (Z).
LC 75 = length of the contour at 75~ of the watershed
height (Z).
Slope Z LC25 LC50 LC75 DA
------------------------------------------------------
------------------------------------------------------
No.l Mine 0.197 25 600 460 450 47916
No.2 Mine 0.225 96 840 400 190 152460
The "LS" factor for the US LE is obtained from Figure 4, from
agronomy note #50 dated January 1977 as follows:
The following tables show the interpolation of the LS factor
for the No. 1 and No. 2 Mines:
NO. 1 MINE
TOPOGRAPHIC FACTOR (LS)
SI,OPE _____________________________________
LENGHT PERCENT SLOPE 18.0 19.7 20.0
-------------------------------------
100 3.50 3.93 4.00

NO. 1 MINE "LS" FACTOR = 3.93
SLOPE
LENGHT
200
270
300
NO. 2 MINE "LS" FACTOR = 8.05
•
The "C" factor for the USLE is obtained from Figure 7, from
agronomy note #50 dated January 1977 as follows:
The following table presents an interpolation of the "C" factor
for the reclaimed areas based on the 1991 and 1992 Vegetation
Surveys.
CANOPY
NO. 2 MINE
TOPOGRAPHIC FACTOR (LS)
---------------------------------'---
PERCENT SLOPE 20.0 22.5 25.0
6.00 7.00 8.00
------------------------ 8.05
7.00 8.50 10.00
PERCENT GROUND COVER
1991 1992
60.0 63.3 65.3 80.0
0.0 oIG 0.042
Average C-Factor Both Mines
0.037 0.034 0.013
0.036
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