2013-01-28_REVISION - C2010089

• Permit No: C2010089
• IBM Index Class Name: REVISION
• Doc Date: 1/28/2013
• Doc Name: Letter & Application and Public Notice
• From: Western Fuels Association Inc
• To: DRMS
• Type & Sequence: TR1
• Email Name: MLT
• Email Name: SB1
• Media Type: D
• Archive: No

WESTERN
FUELS
ASSOCIATION
INC.
The National
Fuel Supply
_ Cooperative
January 23, 2013
Ms. Marcia Talvitie
Environmental Protection Specialist
Colorado Division of Reclamation, Mining and Safety
Durango Field Office
691 CR 233, Suite A -2
Durango, Colorado 81301
Dear Ms. Talvitie:
Sent via FedEx and Email
1
RECEIVED
JAN 2 8 2013
Sion of Reclamation,
Mining & Safety
Subject: New Horizon North (NHN) Mine (Permit No. C- 2010 -089)
Minor Revision No. 2 (MR -02) & Technical Revision No. 1 (TR -01)
Pond NHN -001 As -Built Certification - Response to Preliminary Adequacy Review
In response to your letter dated December 17, 2012 from the Division regarding the above subject matter,
Western Fuels respectfully requests that Minor Revision No. 2 (MR -02) be withdrawn with the submittal of
the enclosed Technical Revision No. 1 (TR -01) application, supporting documentation and proposed
Public Notice. As suggested, the original permit pages for Section 2.05.3(4), revised binder covers and
spine for permit Volume 3 of 4, binder tabs for Appendix 2.05.3(4) -6, the As -built map and Embankment
Compaction Test Results location map that were included in the MR -02 will not be resubmitted, but are
requested to be included and incorporated as part of the TR -01. It is requested however, that all
SEDCAD documents, all Lambert and Associates (Lambert) relative compaction test results, supporting
letters and documentation included with the MR -02 submittals dated November 30, 2012 and December
3, 2012 be disregarded and replaced with those SEDCAD runs, and Lambert documents included with
this TR -01 application submittal.
The following addresses the specific adequacy comments made by the Division in the December 17,
2012 letter restated below, followed by WFC responses:
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 holes are gated, two designs should be run —one
assuming the gates are fully open to determine whether runoff from the design event
will meet the effluent standard in the event that the gates are open when a major storm
occurs (Rule 4.05.6(3)(a)), and another assuming the gates are fully closed to ensure
that the primary spillway is sized to treat and convey the design runoff without
discharge through the emergency spillway (Rule 4.05.9(2)(b)) in the event that the
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