2009-09-21_PERMIT FILE - C1981010A ‎(44)‎

• Permit No: C1981010A
• IBM Index Class Name: Permit File
• Doc Date: 9/21/2009
• Doc Name: Rangeland, Cropland, Wildlife Mitigation & Air Pollution Control Plan
• From: pages 4-101 to 4-171
• Section_Exhibit Name: 4.4 through 4.7
• Media Type: D
• Archive: Yes

Table 4.4-4. Calculation of historic herbaceous cover on premine range sites A, B. and
C and corresponding confidence interval.
•
Range x annual _
Site Year % cover x q Calculated confidence interval
y
A 1979 23.0 .56 .44
=.9 x ± 5n, a .1 ( z q) /n)
1980 34.7
1981 69.8 y = .9(.56) ± (1.895)(.1876)
1982 75.2
1983 54.9 y = 14.85% cover
1984 74.5
1985 59.9 Based upon the USLE, 14.85% cover is
insufficient to control excessive soil erosion. (1)
A n n n
B 1979 22.0 .482 .518 y = .9'x ± tn. a .1 (k (1) /n)
1980 40.8
1981 53.2 y =.9(.482) : (1.895)(.1887)
1982 51.2 A
1983 54.3 y = 7.62% cover
1984 85.1
1985 51.1 Based upon the USLE, 7.62% cover is
insufficient to control excessive soil erosion. (1)
A 1979 23
6 11 (x q ) /n)
512
=
488
9
S
•
1980 .
26.2 ±
y
.
.
.
n, a.
1981 59.8 y =.9(.512) ±(1.895)(.1889)
1982 68.4 A
1983 61.3 y = 10.28% cover
1984 49.4
1985 52.7 Based upon the USLE, 10.28% cover is
insufficient to control excessive soil erosion. (1)
(1) Table 1.
IHBHlb 5/87 Retyped 5196]
•
4-108
Revision: TL 7 I
Approved: -Z/"S/'FE