2011-06-01_PERMIT FILE - M2010049

• Permit No: M2010049
• IBM Index Class Name: PERMIT FILE
• Doc Date: 6/1/2011
• Doc Name: Adequacy Review-05
• From: DRMS
• To: CGRS
• Email Name: MAC
• Media Type: D
• Archive: No

mac
STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
"'June 1, 2011
COLORADO
D IV IS I ON OF
RECLAMATION
MINING
SAFETY
John W. Hickenlooper
Governor
Mike King
Joby L. Adams Executive Director
?CGRS Loretta E. Pi6eda
P.O. Box 1489 Director
Fort Collins, CO 80522
RE: Western Sugar Reclamation Land Development Project; DRMS File No. M-2010-049;
adequacy Review - 05
Dear Mr. Adams,
The Division has identified several other comments and questions that must be addressed prior to
the Division's decision due date. Please be advised that if you are unable to satisfactorily
address any concerns identified in this review before the decision date, it will be your
responsibility to request an extension of the review period. If there are outstanding issues
that have not been adequately addressed prior to the end of the review period, and no
extension request has been requested, the Division will deny this application.
6.4.7 Exhibit G - Water Information
The Applicant has proposed establishing a trigger point based on a groundwater drawdown
of 10 feet. According to the Applicant, the 10 foot trigger accounts for 4 feet of seasonal
fluctuation of groundwater as well as the predicted drawdown of 6 feet. As required by
C.R.S. 34-32.5-116(4)(h), disturbances to the prevailing hydrologic balance of the affected
land and of the surrounding area and to the quality and quantity of water in surface and
groundwater systems, both during and after the mining operation and during the reclamation,
shall be minimized. Therefore, groundwater levels must be maintained within or very near
the prevailing seasonal range of groundwater levels. The trigger level should" not acco r
the drawdown which has been predicted as a result of dewatering the pits.
The trigger point for potential mitigation is typically defined as two feet of drawdown
relative to historic conditions. The Division is willingly to set the trigger at a 6 foot
drawdown from the seasonal high for each of the monitoring wells. Please report the trigger
points for each of the monitoring locations using these criteria.
Office of Office of
Mined Land Reclamation Denver • Grand }unction • Durango Active and Inactive Mines