2016-10-10_REVISION - C1982056

• Permit No: C1982056
• IBM Index Class Name: Revision
• Doc Date: 10/10/2016
• Doc Name: Twentymile Consultation with Colorado Parks and Wildlife
• From: Twentymile Coal, LLC
• To: CPW
• Type & Sequence: TR86
• Email Name: JLE
• Email Name: DIH
• Media Type: D
• Archive: No

10/11/2016 State.co.us Executive Branch Mail - Fwd: FW: Twentymile Coal - WMD Thickener Underflow Borehole and Pipeline- Grouse Considerations and CP
'TATE E Hernandez - DNR, Alysha <[e-mail]>
Fwd: FW: Twentymile Coal - WMD Thickener Underflow Borehole and Pipeline -
Grouse Considerations and CPW Consultation
1 message
Ebert - DNR, Jared <[e-mail]> Tue, Oct 11, 2016 at 6:49 AM
To: Alysha Hernandez - DNR <[e-mail]>
Foidel Creek Mine, C-1982-056, TR -86, "Twentymile Consultation with Colorado Parks and Wildlife", TO: CPW. FROM:
Twentymile Coal"
---------- Forwarded message ----------
From: Nettleton, Jerry<JNet [e-mail]>
Date: Mon, Oct 10, 2016 at 1:20 PM
Subject: FW: Twentymile Coal - WMD Thickener Underflow Borehole and Pipeline - Grouse Considerations and CPW
Consultation
To: "[e-mail]" <[e-mail]>
Cc: "Berdine, Mike" <[e-mail]>, "[e-mail]" <[e-mail]>
Andrea -
In conjunction with our ongoing mining operations, we are submitting a permit revision application to the Colorado
Division of Reclamation, Mining, and Safety (CDRMS) for a new thickener underflow borehole and pipeline to support
ongoing mining operations. Two alternative borehole locations have been identified, although only one will be
constructed. The proposed alternative borehole sites are located; 1) On the Section line between Section 36, TSN,
R87W and Section 31, TSN, R86W; and 2) On the Section line between Section 25, TSN, R87W and Section 36, TSN,
R87W, as shown on the attached map. The borehole installation will be accessed from either RCR27 or the existing
Fish Creek Borehole Road, and will consist of a short 25' wide access road, soil material stockpiles; a leveled pad
(maximum 250'x 170'), an 18 -inch cemented surface casing (60 feet deep), a 12 -inch cased borehole, and a covered 8 -
foot diameter CMP manhole with lightning protection. The pipeline will be installed within existing pipeline and road
disturbance corridors, and will be a double walled HDPE pipe system, with a 8 -inch carrier pipe inside a 12 -inch
containment pipe, buried approximately 5 -feet deep, and extending to the south and east a maximum of approximately
7,720 feet between the selected borehole and the junction to the 1 -MN Thickener Underflow Pipeline leading from the
Washplant facility to the existing 1 -MN Thickener Underflow borehole. Electronic moisture sensors in the interstice
between the inner and outer pipe connected to the pump controls and shut-off valves will provide for timely leak
detection and spill prevention. Access/Inspection manholes will be established at key points along the pipeline route. It
is anticipated that a maximum of six manholes will be placed within the pipeline disturbance corridor. Current plans are
to construct the access road, pad, and pipeline beginning as soon as the required permits are approved, with completion
of all but revegetation prior to March 2017. The borehole installation would remain in-place so long as it is needed to
support mining operations (approximately 8-10 years), and would then be reclaimed. The pipeline would be cut-off below
grade, and plugged and abandoned in-place, and the manholes would be removed, backfilled, and reclaimed.
Mapping provided by CPW (attached for your reference) shows several known sharptail leks in the area. We don't know
whether or not these are active leks, and the two alternative borehole sites are immediately adjacent to the Routt County
Road 27. Given anticipated project timing, construction activities should occur outside of the leking/nesting season, and
subsequent activities will be limited to periodic inspection and maintenance, which can be schedule during periods of
limited grouse activity. We would appreciate your review and direction re: any protective measures and alternatives that
may be appropriate and applicable for this project. The normal approach for grouse protective measures would be a
timing restriction (March 15th through June 30th) for activities within the buffer zone, as shown on the accompanying
map. Given the proximity to the County Road, and that the proposed activities would occur outside of critical use
periods, we are asking for your site-specific review and consideration of alternative protective measures for the proposed
work.
We appreciate your consideration and assistance. If you have questions, or we need to discuss, please feel free to
contact me -
https://mail.googl e.com/m ai I/u/0/?ui=2&i k=e29129fcb5&view=pt&search= i nbox&th=157b3ca6b4d931 be&si m l=157b3ca6b4d931 be 1/2