2018-05-24_REVISION - C1981019

• Permit No: C1981019
• IBM Index Class Name: Revision
• Doc Date: 5/24/2018
• Doc Name: Application
• From: Tri-State Generation and Transmission Association, Inc
• To: DRMS
• Type & Sequence: SL14
• Email Name: ZTT
• Media Type: D
• Archive: No

Table of Contents
1.0 INTRODUCTION.........................................................................................................................1
2.0 METHODOLOGY FOR VEGETATION SAMPLING / COMPARISON METHODS.....................................6
2.1 Sample Site Selection / Location...........................................................................................6
2.2 Determination of Ground Cover.............................................................................................6
2.3 Sample Adequacy Determination...........................................................................................9
3.0 RESULTS..................................................................................................................................10
3.1 Phase II Bond Release Block Summary ...................................................................................10
3.2 Reference Areas....................................................................................................................10
3.2.1 Mountain Shrub Reference Area.......................................................................................10
3.2.2 Sagebrush Reference Area...............................................................................................10
3.3 Sedimentology Evaluation......................................................................................................15
4.0 SUCCESS COMPARISON............................................................................................................18
5.0 LITERATURE CITED..................................................................................................................20
In -Text Maps, Figures, Tables, and Charts
ReclamationUnits Table................................................................................................................1
Map1— Colowyo Mine - Overview................................................................................................. 2
Map 2 — Colowyo Mine — Phase II Bond Release Block Sample Sites................................................3
Map 3 — Colowyo Mine — Mountain Shrub Reference Area Sample Sites............................................4
Map 4 — Colowyo Mine — Sagebrush Reference Area Sample Sites...................................................5
Figure 1— Sampling Procedure at a Systematic Sample Site Location...............................................7
Table SA - Sample Adequacy Results.............................................................................................8
Table 1— Average Ground Cover by Lifeform - 2017.....................................................................11
Chart 1— Average Ground Cover by Lifeform - 2017.....................................................................15
Table - K Factor for Phase II Bond Release Block..........................................................................17
Table - Post -Mining K Factor Inputs.............................................................................................17
Table - LS Factor for Phase II Bond Release Block........................................................................17
Table - C Factor for Phase II Bond Release Block..........................................................................17
Table - A (soil loss in tons/acre/year) for Phase II Bond Release Block...........................................18
Chart 3 — Perennial Cover Success Comparison - 2017..................................................................19
Chart 4 — Averaged Sedimentology Success Comparison - 2017 .....................................................19
Appendix A — Raw Data Tables
Table Al — Vegetation Cover — Species List - 2017
Table A2 — Vegetation Cover — Phase II Bond Release Block - 2017
Table A3 — Vegetation Cover — Mountain Shrub Reference Area - 2017
Table A4 — Vegetation Cover — Sagebrush Reference Area - 2017