2012-04-27_REVISION - C2009087

• Permit No: C2009087
• IBM Index Class Name: REVISION
• Doc Date: 4/27/2012
• Doc Name: Updates to the Vegetation Section
• From: Peabody Sage Creek Mining, LLC
• To: DRMS
• Type & Sequence: SL1
• Email Name: JDM
• Email Name: DIH
• Media Type: D
• Archive: No

Area
Total
First Hit
Cover
( %)
Total First Hit
Allowable
Herbaceous Cover
( %)
Standing
Dead ( %)
Litter
( %)
Rock ( %)
Bare Soil
( %)
Phase II Bond
release Block
39.6
37.5
0.57
35.47
6.1
18.2
Mountain
Brush RA
71.5
12.8
0.73
21.53
-
6.2
Sagebrush RA
71.1
44.7
2.27
19.40
-
7.27
Peabody Sage Creek Mine April 2012
SL -1 Phase 11 Bond Release Request
Table 1, Vegetation Cover Sampling Summary, provides a summary of the cover attributes
for the Phase II bond release block and the mountain brush and sagebrush native types in the
reference area. Table 1 also provides the allowable first hit herbaceous cover values (initial
value for mountain brush) used in the success evaluations for cover. The basis and
calculation of the allowable first hit herbaceous cover is presented beginning on page 10 of
the revegetation success evaluation report by ESCO Associates in Attachment E —
Revegetation Supporting Documentation.
Table 1. Vegetation Cover Sampling Summary, Phase II Bond Release Block and
Reference Area (RA), PSCM.
Mean for purposes of sample adequacy calculation; uppermost possible value of the mean,
15.1 taken forward for use in performance standard calculation; see text.
Sample adequacy using first hit cover was met for the Phase II bond release block and the two
reference areas. When sample adequacy was calculated using allowable first hit cover, it was
met for the Phase II bond release blocks and the sagebrush reference but not the mountain
brush reference area. The sampling results and statistics for total first hit cover and allowable
first hit herbaceous cover are summarized below in Table 2, Sample Adequacy Summary for
Total First Hit Cover, and Table 3, Sample Adequacy Summary for Allowable First Hit
Herbaceous Cover.
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