2010-05-25_REVISION - C1982056

• Permit No: C1982056
• IBM Index Class Name: REVISION
• Doc Date: 5/25/2010
• Doc Name: Letter & Application
• From: Twentymile Coal Company
• To: DRMS
• Type & Sequence: MR242
• Email Name: JDM
• Media Type: D
• Archive: No

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PeabR?dq Ste.
Twentymile Coal Company 29515 Routt County Road #27
Oak Creek, CO 80467
. 970.879.3800
ICE1?ED
Mr. Jason Musick May 24, 2010
Environmental Protection Specialist MAY 2 5 2010
Colorado Division of Minerals and Geology Div s.;,;,;; r, Ialwlion,
1313 Sherman Street, Room 215 Mining and SA4
Denver, Colorado 80203
[phone] X8134
RE: Twentymile Coal, LLC - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR10-
242) 6-Right Thickener Underflow Pipeline Temporary Modifications
Dear Mr. Musick:
Twentymile Coal, LLC (TC) requests CDRMS approval of a Minor Revision (MR10-242) to the
approved Permit, for temporary modifications to the previously approved (approved under TR09-69,
11/25/09) 6-Right (6RT) Thickener Underflow Pipeline, to address a critical mine situation.
Our existing thickener underflow borehole plugged last Wednesday, and we have been unable to clear the
blockage. As a result, our Washplant has been shut-down since Wednesday, and we are rapidly running
out of room in our Raw Coal Stockpile. We have a limited supply of washed coal in our clean coal (BOB
and Batch-Weigh) stockpiles for shipment. This situation is critical, given the potential to shut-down
mine production and limit coal shipments.
Given the critical situation, we need to reestablish a workable thickener underflow discharge ASAP. Our
immediate focus is tying in the permitted thickener underflow pipeline to the 6RT Borehole. In order to
expedite this process, we have completed thermal welding of most of the pipeline and connection of the
secondary containment pipeline on the surface, and are working with the UPRR to try to obtain their
approval of a temporary culvert crossing under the existing track ballast near the permitted crossing
location.
If we obtain the required approval from the UPRR, we propose to temporarily run the pipeline on the
surface to the permitted and completed Borehole, with the additional safeguards of full-time monitoring
of coal slurry flow at the 6RT Borehole location and a walking inspection of the pipeline once a shift. If
UPRR permitting is delayed, alternate solutions include; 1) Temporarily suspending the pipeline from the
existing railroad overpass (we are working with Routt County Road and Bridge on this option); 2)
Temporarily suspending the pipeline from a tensioned cable anchored to two or more poles over the
UPRR rail Spur; or 3) Routing the pipeline under the Rail Spur, either through the existing culvert near
Pond F, or through a new culvert crossing established under the portion of the Rail Spur that is owned by
TC.
The temporary solution would function until such time as either a replacement borehole is completed into
the SW Mining District (would be located in the vicinity of the existing plugged borehole, and would be
submitted and approved as a Minor Revision to our Permit), or until UPRR approval is obtained and the
original designed and permitted pipeline can be completed under the UPRR rail-spur. Once a permanent
solution is implemented, the temporary surface pipeline would be buried per our original approved plans.
G:\Environmental\REVISION\MINOR-RV\MR10-242 6RT TUF Pipeline Mods\A4R10-242 6RT TUF Pipeline Mods TL.doc