2011-01-19_REVISION - C1981019 ‎(6)‎

• Permit No: C1981019
• IBM Index Class Name: REVISION
• Doc Date: 1/19/2011
• Doc Name: Updated 2011 2008 Phase III Bond Release Evaulation - Year 2
• From: Colowyo Coal Company
• To: DRMS
• Type & Sequence: SL5
• Email Name: JRS
• Email Name: SB1
• Media Type: D
• Archive: No

1.0 introduction ..
Table of Contents
............................................................................................................... 1
0 Methodology for Vegetation Sampling / Comparison Methods
2 ........................................... 4
. ...................... 4
2.1 Sample Site Selection / Location ............................................... ......................
...................... 5
2.2 Determination of Ground Cover ................................................ ......................
5
2
3 Determination of Woody Plant Density ...................................... ............................................
. ... 7
4
2 Determination of Current Annual Production .............................. .........................................
. ........................ 8
2.5 Sample Adequacy Determination .............................................. ....................
.................... 9
3.0 Results ........................................................................................ ........................
.............. 9
3.1 Phase III ................................................................................ .............................
.............. 10
3.2 Reference Areas ......................................................................
.
A ............................
.......................................... 10
rea ......................................
2.1 Mountain Shrub Reference
3
. ........... 11
3.2.2 Sagebrush Reference Area ............................................... ...............................
........ 25
0 Success Evaluation .....................................................................
4 ..................................
. ... 25
4
1 Ground Cover and Production ................................................... .......................................
. ............ • • 26
...
4.2 .................................................................................
Diversity .........................
26
.........
4.3 Woody Plant Density ............................................................... ..................................
In-Text Tables, Charts, Figures, and Maps
Table P - Precipitation at the Colowyo Mine, 2001 - 2008 .............................................................. 3
Chart P - Precipitation by Growing Season at the Colowyo Mine, 2001 - 2008 ................................. 3
................... 6
Figure 1 .................................................................................................................
Chart 1- All Sampled Areas - Average Ground Cover by Lifeform - 2007 & 2008 .........................
tive Ground Cover (Composition) by Lifeform - 2007 & 2008....
l
R 13
13
a
e
Chart 2 - All Sampled Areas -
Chart 3 - All Sampled Areas - Perennial Ground Cover Comparison - 2007 & 2008 .......•••••"'""..
.
Table 1 - All Sampled Areas - Average Ground Cover by Lifeform - 2007 & 2008 .......................
tive Ground Cover (Composition) by Lifeform - 2007 & 2008 .....
l
R 15

17
a
e
Table 2 - All Sampled Areas -
Table 3 - Vegetation Production - Summary of Areas Sampled - 2007 & 2008 .............................. 19
Chart 4 - Summary of Current Annual Production by Unit and Lifeform - 2007 & 2008 .............:::: 9

Table 4 - Vegetation Cover - Diversity Summary - 2007 & 2008 ..............................................
ith between 3% & 50% Relative Cover (by Area) ............
i 0
2
20
es w
Chart 5 - Number of Grass Spec
:::: 0
Chart 6 - Perennial Forb Relative Cover (by Area) - 2007 & 2008 ...........................................
Table 5 - Woody Plant Density - Phase III Shrub Plots - 2008 ..................................................... 21
22
Chart 7 - Woody Plant Density - Stems per Acre - 2008 ............................................................ 22
Chart 8 - Woody Plant Density - Woody Plant Population Area - 2008 ........................................ 23
Table 6 - Woody Plant Density - Phase III - 2007 ...................................................................... 24
Table 7 - Woody Plant Density - Phase III - 2008 ...................................................................... 27
Table 8 - Success Testing - Phase III - 2007 & 2008 .................................................................