2011-04-06_REVISION - C2009087 ‎(4)‎

• Permit No: C2009087
• IBM Index Class Name: REVISION
• Doc Date: 4/6/2011
• Doc Name: Phase II Bond Release Application
• From: Peabody Sage Creek Mining, LLC
• To: DRMS
• Type & Sequence: SL1
• Email Name: JDM
• Media Type: D
• Archive: No

•
r]
•
Total Minus Noxious
Excess Non-allowable Annual Cover Deduction
Woody Plants - Not Allowed
Mean Allowable Cover
Standard Deviation of Mean Allowable Cover
Sample Size
Minimum Adequate Sample Size
71.17
0.0
58.40
12.77
5.10
15
29
As can be seen, sample adequacy based on first-hit allowable herbaceous cover was not
achieved. Hence, in accordance with a proposal to address this problem for use of the Mountain
Brush Reference Area discussed with and approved by DRMS (see Appendix 7), evaluation of
sample adequacy based on all-hit data was undertaken:
ANNUAL DEDUCTION CALCULATION:
Total All Hit Vegetation Cover
Noxious Weed Cover
Total Minus Noxious
Allowable Annual Cover Limit
Allowable Annual Cover
Actual Annual Cover (w/o noxious annuals)
Non-allowable Annual Cover (zero in calculations
below if positive)
95.00
0.47
94.53
X 0.1
9.45
1.23
8.2
ALLOWABLE ALL-HITCOVER CALCULATION
Total All Hit Vegetation Cover
Noxious Weed Cover
Total Minus Noxious
Excess Non-allowable Annual Cover Deduction
Woody Plants - Not Allowed
Mean Allowable Cover - All Hit
Standard Deviation of Mean Allowable Cover
Sample Size
Minimum Adequate Sample Size
First Hit to All-hit Ratio (see Appendix 6, Table 6-4)
Mean Allowable Cover Converted to First-hit Basis
95.00
0.47
94.53
0.0
• 69.60
24.93
4.56
15
7
0.496
12.37
For the Sagebrush Reference and the Phase II Bond Release Block, sample adequacy was
reached using first-hit data:
11