2013-09-04_REVISION - C1981019

• Permit No: C1981019
• IBM Index Class Name: Revision
• Doc Date: 9/4/2013
• Doc Name: Adequacy Letter
• From: DRMS
• To: Colowyo Coal Company
• Type & Sequence: TR99
• Email Name: RDZ
• Email Name: DIH
• Media Type: D
• Archive: No

DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
STATE OF COLORADO
COLORADO
ID IV I S I O N O F
RECLAMATION
MINING
SAFETY
Re: Colowyo Mine, Permit No. C- 1981 -019, TR -99 Final Adequacy
Dear Mr. McCourt:
Your technical revision application TR -99 was considered complete for the purposes of filing on July 18, 2013. On
July 22, 2013 the Division sent an adequacy letter to Colowyo Coal Company indicating that we were concerned
that the new design does not contain a revised geotechnical analysis. On August 14, 2013 we received Colowyo's
response to our adequacy issue, including a letter from Mark Gray of Shannon & Wilson (Coorado P.E. 22804)
stating that in his professional opinion the revised plan will not adversely affect the stability of the East Taylor
Fill.
The Division agrees with Mr. Gray's assessment, and we have no further issues regarding TR -99. However, a
portion of the slope will be steeper than the original plan, and (while this would have no effect to the overall stability
to the entire South Taylor Fill) this area could have the potential for smaller slumps along the surface. Any
movements in the fill should be recorded in Colowyo's quarterly fill monitoring reports.
Please contact me (extension 8113) if you have any questions.
Sincerely,
R- � (/ -/ -, P 7"�,
Robert Zuber, P.E.
Environmental Protection Specialist
Office of Office of
Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines
John W. Hickenlooper
Governor
September 4, 2013
Mike King
Executive Director
Mr. Chris McCourt
Colowyo
o Coal Company
Loretta E. Pineda
P y
Director
5731 State Highway 13
Meeker, CO 81641
Re: Colowyo Mine, Permit No. C- 1981 -019, TR -99 Final Adequacy
Dear Mr. McCourt:
Your technical revision application TR -99 was considered complete for the purposes of filing on July 18, 2013. On
July 22, 2013 the Division sent an adequacy letter to Colowyo Coal Company indicating that we were concerned
that the new design does not contain a revised geotechnical analysis. On August 14, 2013 we received Colowyo's
response to our adequacy issue, including a letter from Mark Gray of Shannon & Wilson (Coorado P.E. 22804)
stating that in his professional opinion the revised plan will not adversely affect the stability of the East Taylor
Fill.
The Division agrees with Mr. Gray's assessment, and we have no further issues regarding TR -99. However, a
portion of the slope will be steeper than the original plan, and (while this would have no effect to the overall stability
to the entire South Taylor Fill) this area could have the potential for smaller slumps along the surface. Any
movements in the fill should be recorded in Colowyo's quarterly fill monitoring reports.
Please contact me (extension 8113) if you have any questions.
Sincerely,
R- � (/ -/ -, P 7"�,
Robert Zuber, P.E.
Environmental Protection Specialist
Office of Office of
Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines