2009-11-13_PERMIT FILE - C1982056 ‎(3)‎

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 11/13/2009
• Section_Exhibit Name: Exhibit 26C Coal Refuse Disposal Area Expansion
• Media Type: D
• Archive: No

•
Conclusions
Based on the results of this Geotechnical and Hydrologic Investigation, the construction of the Coal Refuse
Disposal Area (CRDA) Expansion is feasible at the proposed location. The analysis and design parameters
for the construction of the CRDA Expansion, Haul Roads and Surface Water Management are outlined
herein.
Purpose and Scope of Study
This report presents the results of Geotechnical and Hydrological Investigation for the proposed CRDA
Expansion to be constructed at the Twentymile Coal - Foidel Creek Mine in Routt County, Colorado. The
approximate location of the project site is shown in Figure #1.
The purpose of this investigation was to investigate and analyze the geotechnical and hydrologic conditions
related to the proposed CRDA Expansion, as well as provide design and construction recommendations
conforming to the regulations of the Colorado Mined Land Reclamation Board for Coal Mining, effective
• August 20, 1980 and revised September 14, 2005. NWCC, Inc. is acting as the primary consultant and
performed the geotechnical related investigation and design. Civil Design Consultants, Inc., as a
subconsultant to NWCC, Inc. has completed the civil design related to configuration of the CRDA as well
as the design and layout of the proposed haul road. Hydro - Environmental Solutions, Inc., as a
subconsultant to NWCC, Inc. is the hydrologic consultant for the project.
This Geotechnical and Hydrologic Report has been prepared to summarize the data obtained from our field
and laboratory investigations, results of the stability analysis and to present our conclusions and
recommendations for the construction of the CRDA Expansion, haul road construction and surface and
internal drainage. The Surface Water Control Plan is being presented in a separate report and has been
incorporated into this report where appropriate.
Proposed Construction
It is our understanding that the proposed CRDA Expansion will consist of the construction a coal refuse
stockpile with a volume of approximately 20 million cubic yards. The coal refuse will be generated from
the Foidel Creek Mine, as well as the future Sage Creek Mine, which is to be located several miles to the
north - northwest of this site.
The coal refuse consists of low quality coal generated from the existing wash plants located to the north of
the proposed CRDA. The coal refuse product will be transported from the wash plants to the proposed
• refuse pile via existing surface roads from the coal refuse bin to the road currently used to access the low
Job Number: 08 -7915 NWCC, Inc. Page 1
Revised 10/12/09