2018-10-18_GENERAL DOCUMENTS - C1981019

• Permit No: C1981019
• IBM Index Class Name: General Documents
• Doc Date: 10/18/2018
• Doc Name Note: for SL14
• Doc Name: Proposed Decision and Findings of Compliance
• From: DRMS
• To: Colowyo Coal Company L.P.
• Email Name: ZTT
• Media Type: D
• Archive: No

Proposed Decision and Findings of Compliance October 2018
Partial Phase II and III Bond Release SL-14 Page 9
Phase II Bond Release Parcel Results – EP051 and EP057

2016 Cover: Herbaceous cover: 22.83%
Herbaceous cover standard (90%): 18.29%
The 2016 sample data successfully exceeds 90% of the herbaceous cover
standard.

2016 Sedimentology: Post-Mining: 0.064 tons/acre/year
Pre-Mining: 0.173 tons/acre/year
The 2016 sedimentology evaluation data shows post-mining condition
sediment loss to be less than pre-mining conditions.

Phase II Bond Release Parcel Results – EP052, EP053, EP054, and EP055

2017 Cover: Herbaceous cover: 32.83%
Herbaceous cover standard (90%): 20.88%
The 2017 sample data successfully exceeds 90% of the herbaceous cover
standard.

2017 Sedimentology: Post-Mining: 0.071 tons/acre/year
Pre-Mining: 0.145 tons/acre/year
The 2017 sedimentology evaluation data shows post-mining condition
sediment loss to be less than pre-mining conditions.

Phase II Bond Release Parcel Results – EP045, EP046, EP047, EP047, EP049, EP050 and
WP012/013

2017 Cover: Herbaceous cover: 33.59%
Herbaceous cover standard (90%): 20.88%
The 2017 sample data successfully exceeds 90% of the herbaceous cover
standard.

2017 Sedimentology: Post-Mining: 0.180 tons/acre/year
Pre-Mining: 0.352 tons/acre/year
The 2017 sedimentology evaluation data shows post-mining condition
sediment loss to be less than pre-mining conditions.

Phase III

Based on the 2016 and 2017 vegetation sampling results for Phase III bond release, the Division
finds that Colowyo has achieved adequate cover, productivity and diversity on the SL-14
reclamation parcels. These results are summarized below.