2010-06-01_REVISION - C1981019 ‎(5)‎

• Permit No: C1981019
• IBM Index Class Name: REVISION
• Doc Date: 6/1/2010
• Doc Name: Exhibit 5 2006, 2007, 2008 & 2009 Phase II Vegetation Reports
• From: Colowyo Coal Company
• To: DRMS
• Type & Sequence: SL4
• Email Name: JRS
• Email Name: SB1
• Media Type: D
• Archive: No

Table of Contents
1.0 Introduction ............................................................................................ ............................... 1
2.0 Methodology for Vegetation Sampling / Comparison Methods — Colowyo Mine ................ 4
2.1 Sample Site Selection / Location ............................................................ ............................... 4
2.2 Determination of Ground Cover ............................................................. ............................... 5
2.3 Sample Adequacy Determination ........................................................... ............................... 5
2 .4 Success Evaluation ............................................................................... ............................... 7
3.0 Results ..................................................................................................... ............................... 8
3.1 Phase II Summary ................................................................................ ............................... 8
3.2 Reference Areas .................................................................................. ............................... 9
3.2.1 Mountain Shrub ....................................................................... ............................... 9
3.2.2 Sagebrush .............................................................................. ............................... 10
4.0 Conclusion ............................................................................................. ............................... 14
5.0 Literature Cited ..................................................................................... ............................... 16
Appendix ............................................................................ ............................... Rear of Document
In -Text Tables, Charts, Figures, and Maps
Table P — Precipitation at the Colowyo Mine, 2001 - 2006 ............................... ............................... 3
Chart P — Precipitation by Growing Season at the Colowyo Mine, 2001 - 2006 .. ............................... 3
Figure1 ..................................................................................................... ............................... 6
Chart 1 — Phase II - Reference Area Comparison — Average Ground Cover by Lifeform - 2006 ........ 11
Chart 2 — Phase II — Ref. Area Comp. — Relative Ground Cover (Composition) by Lifeform - 2006... 11
Table 1 — Average Ground Cover Summary - 2006 ....................................... ............................... 12
Table 2 — Relative Ground Cover (Composition) Summary - 2006 .................. ............................... 13
Table 3 — Phase II — Bond Release Success Comparison - 2006 .................... ............................... 15