2018-01-29_REPORT - C1982056 (2)

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Peabod 1111 ENERGY Twentymile Coal, LLC 29515 Routt County Road 27 Oak Creek, CO 80467 970.879.3800 Ms. Tabetha Lynch RECEIVED January 23, 2018 Environmental Protection Specialist Division of Reclamation, Mining, and Safety JAN 29 2018 1313 Sherman Street - Room 215 Denver, Colorado 80203 Division of Reclamation, (970) 866-3567 X8147 Mining & Safety Re: Twentymile Coal, LLC (TC) — Foidel Creek Mine (C-82-056), 2017 Annual Reclamation Report Dear Ms. Lynch: Enclosed are duplicate copies of the 2017 Annual Reclamation Report (ARR) for the Foidel Creek Mine. During 2017, TC filed for a five-year Permit Renewal, and a number of activities were permitted and initiated under Technical and Minor Revision approvals (summarized as follows), with most of the permitted activities occurring within existing disturbance areas (no change in acreage unless otherwise noted): Permit Renewal RN17-07 (Mid -Term Review combined with Renewal, submitted 10/27/17, approval pending) TR17-87, Sandstone Sub Thickener Underflow Borehole and Pipeline (submitted 03/14/17, approved 06/22/17, no new disturbance) TR17-88, SWMD and WMD Thickener Underflow Boreholes, Pump Booster Station, and Pipelines (submitted 04/11/17, approved 07/11/17, + 13.5 acres disturbed) MRI 7-303, Sandstone Substation Test Hole (submitted 01/02/17, approved 02/02/17, no new disturbance) MR17-304, 9 -East Additional Utility Boreholes (submitted 01/12/17, approved 02/23/17, +0.4 acres disturbed) MR17-305, Stoker Coal Screening Test (submitted 02/22/17, approved 03/07/17, no new disturbance) MR17-306, Sandstone Sub Thickener Underflow Borehole and Pipeline (submitted 03/16/17, approved 03/17/17, replaced by TR -87) MR17-307, SWMD and WMD Thickener Underflow Boreholes, Pump Booster Station, and Pipelines (replaced by TR -88) Changes in permitted disturbed and affected area acreages during 2017 included increases in the permitted disturbed and affected acreage of 13.9 acres (TR17-88 and MR 17-304). Additional permitted surface disturbance during 2017 resulted in a cumulative total for permitted surface disturbance of approximately 747.7 acres, although actual disturbance is 742.9 acres (4.8 acres permitted but not yet disturbed). Please refer to the revised maps and text associated with the revisions referenced above, for specific details. Key mining and related activities occurring during 2017 included: ➢ Ongoing development and longwall mining operations in the WMD (Panels 9RT and 8RT) ➢ Additional soil material stripping and extension of the underdrain, ongoing refuse placement activities, and reclamation of the completed second bench of the Coal Refuse Disposal Expansion Area ➢ Expansion and upgrades of Thickener Underflow pipeline and borehole system to increase flexibility and system redundancy (Sandstone Sub Thickener Underflow Borehole and Pipeline, SWMD and WMD Thickener Underflow Boreholes, Pump Booster Station, and Pipelines)