2010-12-06_REVISION - C1982056

• Permit No: C1982056
• IBM Index Class Name: REVISION
• Doc Date: 12/6/2010
• Doc Name: Letter & Application
• From: Twentymile Coal Company
• To: DRMS
• Type & Sequence: MR250
• Email Name: JDM
• Media Type: D
• Archive: No

Poll body
Twentymile Coal
29515 Routt County Road 27
Oak Creek, CO 80467
970.879.3800
Mr. Jaso& Musick, Environmental Protection Specialist . December 2, 2010
Division of Reclamation, Mining, and Safety
1313 Sherman Street, Room 215
Denver, Colorado 80203 SEC
[phone] X 8134 t J'! "'.1; 1
RE: Twentymile Coal Company - Foidel Creek Mine (Permit No. C-82-056), Minor Revision
(MR10-250) -18-Left Compressor Building
Dear Mr. Musick:
Twentymile Coal, LLC (TC) requests CDRMS approval of a Minor Revision to our existing approved
Permit for installation, operation, and reclamation of a Compressor Building at the existing 18-Left
(18LT) Shaft location. The proposed Compressor Building will be a pre-fabricated steel building
installed over the existing compressor installation, and will involve minor surface excavation, boring
of shallow auger holes for support piers, and extension of the existing concrete compressor pad.
The proposed 18LT Compressor Building will be located on the existing 18LT Shaft Pad and within
the existing 18LT Shaft Installation surface disturbance area, and will involve no new or incremental
disturbance. Construction for the 18LT Compressor Building will involve boring up to 14, 12-inch
diameter auger holes to a depth of approximately 20 feet for concrete support piers; over-excavation,
replacement, and re-compaction of surface soil materials under the pad extension footprint; placement
of reinforcing steel and pouring of the support piers and pad extension; and erection of the pre-
fabricated steel bulding.
Drainage for the existing 18LT Shaft Installation is controlled by the existing two-cell 18LT
Sedimentation Pond and site-specific drainage and sediment control measures. The proposed
Compressor Building will not modify the drainage configuration or requirements. The 18LT
Compressor Building will remain in-place until it is no longer needed to support ongoing or anticipated
future mining operations. Reclamation of the Compressor Building will probably occur as part of the
overall reclamation of the 18LT Shaft Installation, with equipment removal, foundation demolition,
backfilling and grading, soil material replacement, and reseeding. Bond monies are already in place
for all reclamation components except removal of the steel building and demolition of the pad
extension (the concrete piers will be buried in-place). The accompanying bonding calculation
addresses estimated bonding costs for these additional components.
This submittal includes revised PAP text, exhibits; and maps, addressing the location, configuration,
operation, maintenance, and reclamation of the proposed Compressor Building. New and revised PAP
materials are identified by the attached Summary of Revisions/Additions.
We would like to proceed with this project as soon as possible, to minimize construction under winter-
weather conditions. We, therefore, appreciate your consideration, cooperation, and assistance in
facilitating timely review and approval of this revision application. After you have opportunity to