2014-04-03_REVISION - C1981012

• Permit No: C1981012
• IBM Index Class Name: Revision
• Doc Date: 4/3/2014
• Doc Name: Adequacy Review ‎(Emailed)‎
• From: DRMS
• To: New Elk Coal Company
• Type & Sequence: TR69
• Email Name: LDS
• Email Name: SB1
• 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]
April 3, 2014
Louis Head,
New Elk Coal Company
12250 Highway 12
Weston, CO 81091
Re: New Elk Mine (Permit No. C- 1981 -012)
Technical Revision No. 69, (TR69)
Initial Adequacy Review
Dear Mr. Head:
STATE OF COLORADO
COLORADO
D I V I S I ON OF
RECLAMATION
MINING
SAFETY
John W. Hickenlooper
Governor
Mike King
Executive Director
Loretta E. Pineda
Director
The Division has reviewed the material submitted by New Elk Coal Company for TR69 (in response to
NOV CV 2013 -009), and has the following comments:
The cover letter for the revision indicates that the revision has been prepared to address design
criteria for "RDA Clean Water Diversion Ditch D -55" however the "RDA Clean Water
Diversion Ditch" and "Ditch D -55" are not one and the same. Ditch D -55 is the segment of the
upland diversion that borders the western edge of the RDA, roughly between Stations 30 +00 to
41 +00 on the 1 -31 -2014 plan view provided by NECC. The northern and eastern segment of
the upland diversion (roughly from Stations 30 +00 to 0 +00) are vaguely described elsewhere
which has led to much confusion, but will be referred to as the "RDA Clean Water Diversion
Ditch" in the remainder of this letter. Together these two ditch segments constitute the RDA
upland diversion ditch.
Ditch D -55 drains a smaller watershed and is a steeper channel section than the RDA Clean
Water Diversion Ditch.
The design for D -55 is presented in Exhibit 19(24) pages 24 -26, and further described on page
2.05 -1 la. D -55 is also shown on Map 13, East Portal Sediment and Surface Water Control
Plan, approved with TR -66. The basis for the design is modeled on the 100y /24hr event and
includes:
• Watershed area 9.1 acres;
• Design discharge of 13.9 cfs;
• A trapezoidal section, with a minimum depth of 1.6', bottom width of 3', 2:1
sideslopes, and 3" rip rap lining;
• An overall gradient of 9 %.
We have been unable to locate the design for the RDA Clean Water Diversion Ditch in the
approved permit application, but did locate the following related information:
• Culverts C75 and C76 were temporary culverts located in the East Branch of the RDA
Office of Office of
Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines