2017-01-13_REVISION - C1982056 - Laserfiche WebLink

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Peabodq ReceoD 1111 ENERG �,p11 Twentymile Coal, LLC �a%� 13 29515 Routt County Road 27 Oak Creek, CO 80467 p1�1gk0M i�G MAD Of Ve $ EV 970 879 3800 Ms. Tabetha Lynch, Environmental Protection Specialist January 12, 2017 Division of Reclamation, Mining, and Safety 1313 Sherman Street, Room 215 Denver, Colorado 80203 (303) 866-3567 X 8147 RE: Twentymile Coal, LLC - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR17-305) — 9 -East Additional Utility Boreholes Dear Ms. Lynch: Twentymile Coal, LLC (TC) requests CDRMS approval of a Minor Revision to our existing approved Permit for installation, operation, and reclamation of two utility boreholes, drilled to a maximum of 18 - inches in diameter and cased to a maximum of 14 -inches in diameter, to be located over the 9 -East Longwall Panel. In order to minimize new disturbance, to the extent possible, the two additional boreholes will utilize the existing access (light -use) road and one of the existing pads previously permitted and constructed under MR16-296. A new pad, approximately 80 x 120 feet will be constructed adjacent to the existing road for the second borehole. The boreholes will extend to a maximum depth of approximately 990 feet, and will be accessed from County roads RCR33 and RCR179, using the existing established Fish Creek Tipple, 18 -Right Shaft, and 9 -East Utility Borehole roads. As shown on Figure EX49EE-F2, one borehole will be completed from the existing 9 -East Exhaust Blower Pad, with no additional disturbance. In addition to the two boreholes, new disturbance will include the new pad, the addition of soil material from the new pad to the existing adjacent soil stockpiles, and placement of a maximum of two additional wooden powerpoles for an extension of the existing powerline to the new pad. Portable (wheel -mounted) surface blower units may be placed at one or both of the new utility borehole locations. Areas affected by the new disturbance were covered by the previous cultural resource survey and wildlife review and consultation completed for MR16-296. The proposed new pad falls between the two minor drainage features identified and addressed by MR16-296, and the existing drainage control features, including a ditch on the east (upgradient) side of the road and two road culverts will adequately address potential runon to the pad. The minor runoff from the new pad will be addressed as a Small Area Exemption (SAE) by gravel surfacing on the pad and the existing line of wattles or equivalent drainage control on the west side of the existing road and new pad. The 9 -East Utility Boreholes will remain in place until they is no longer needed to support ongoing operations, and will then be reclaimed. Reclamation will involve plugging and sealing the boreholes, regrading the pads and road, soil material replacement, and reseeding.