2012-12-17_REVISION - C2010089 ‎(2)‎

• Permit No: C2010089
• IBM Index Class Name: Revision
• Doc Date: 12/17/2012
• Doc Name: Adequacy Review
• From: DRMS
• To: Douglas C. White Director ofTechnical Services, Western Fuels Association,
• Type & Sequence: TR1
• Email Name: MLT
• Email Name: SB1
• Email Name: SLB
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1 313 Sherman St„ Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
17 December 2012
Douglas C. White, P.E.
Director of Technical Services
Western Fuels Association, Inc.
12050 N. Pecos Street, Suite 100
Westminster, CO 80234
Re: New Horizon North Mine (Permit No. C- 2010 -0$9)
Minor Revision No. 2 (MR -02) & Technical Revision No. 1 (TR -01)
Pond NHN -001 As- Built Certification - Preliminary Adequacy Review
Dear Mr. White:
COLORADO
D IV IS I ON OF
RECLAMATION
MINING
SAFETY
John W. Hiekonlooper
Governor
Mike King
Executive Director
Loretta E. Pineda
Director
The application for MR -02 was received by the Division on 03 December 2012, and was deemed
complete, for purposes of filing, on the same day. With MR -02, WFC has provided as-
constructed documentation and certification for Sedimentation Pond NHN -001.
The Division has conducted a preliminary adequacy review of the materials submitted with MR-
02. We note that a number of changes to the original Arcadis design have been made, and
believe that review and approval of these changes would be more appropriately handled under
the Technical Revision (TR) process rather than as a Minor Revision (MR). We therefore
request that Western Fuels submit an application form for a TR, together with a letter requesting
that MR -02 be withdrawn. (There is no need to resubmit the original pages and map with the
TR -01 application, although a proposed Public Notice must be provided.)
The following section itemizes the adequacy comments made by the Division as a result of our
review of the MR -02 application. Please prepare and submit a response package addressing each
of these issues.
Rule 2.05.3(4) and 4.05.9 Ponds and Impoundments
Surface Water Hydrology
1. The designs (SEDCAD runs) submitted for the NHN -001 pond as -built indicate that the
primary discharge structure is a perforated riser, with 2" holes at the 5671.5' elevation.
Map 2.05.3(4) -6 and the photographs provided by the operator on December 6, 2012
indicate that the primary spillway is a drop inlet riser at 5675.5' with two 6" gated weep
holes at 5671.5'. Since these weep boles are gated, two designs should be run - one
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Mined Land Reclamation Denver • Grand )unction • Durango Active and Inactive Mines