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k <br />29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />June 13, 2017 <br />Ms. Tabetha Lynch, Environmental Protection Specialist <br />Division of Reclamation, Mira ng, and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />(303) 866-3567 X 8147 <br />RE: Twentymile Coal, LLC - Toidel Creels Mine (Permit No. C-82-056), Technical Revision (TR17-88) <br />SWMD 1SW & WMD 12 -Left Thickener Underflow Boreholes, Pump Boost Station, and Pipelines <br />Dear Ms. Lynch: <br />Twentymile Coal, LLC (TC) requests CDRMS approval of a Technical Revision to our existing approved <br />Permit for construction, operation, and reclamation of two new Thickener Underflow (TUF) boreholes, <br />additional pipelines, a pump boost station, and associated ancillary equipment and facilities in the <br />Southwestern Mining District (SWMD) - Panel 1SW, and in the Western Mining District (WMD) - Panel <br />12 -Left. The new thickener underflow installations are needed both as backup for the current system, and <br />ultimately, to replace SWMD boreholes in 2SW and 3SW, which are currently being completed, if and <br />when either of these boreholes are no longer functional. <br />The ISW Thickener Underflow Borehole installation will be located north of the mine facilities area and <br />northwest of the Union Cellular repeater tower that is located on top of the sandstone cliffs adjacent to <br />Routt County Road 27 (RCR27). Access to this site will utilize the existing ranch road currently used for <br />access to the Union Cellular tower off of the Fish Creek access road. Minor road improvements to <br />provide for year-round access will include limited grading, placement of water -bars and minor work on <br />the existing ditches, and placement of gravel surfacing materials. The 1 SW Thickener Underflow <br />Borehole will extend from the surface into the sealed SWMD mine workings approximately 1,060 feet in <br />the 1 SW Panel. <br />The 12 -Left Thickener Underflow Borehole installation will be located on the north side of RCR27, east <br />of the intersection with Routt County Road 37. The pad will require access from RCR27, and TC has <br />applied to the County for the required "Driveway" permit. A 100 foot light -use road will be built from <br />the County road to the borehole pad. The 12 -Left Thickener Underflow Borehole will extend from the <br />surface into the sealed WMD mine workings approximately 1,260 feet in the 12 -Left Inby Panel. <br />Installation of the I SW & 12 -Left Thickener Underflow Boreholes will involve placement of construction <br />erosion controls (silt fence and/or straw wattles), removal and stockpiling of soil materials and the limited <br />vegetation from the pad areas and road (12 -Left only), construction of the designed drainage structures <br />(ditches and rock sumps), minor cut and fill grading to establish the access road and level drill pads, <br />minor road and drainage improvements for the 1 SW borehole, placement of gravel surfacing on the roads <br />and pad areas, excavation of temporary cuttings pits on the drill pads, and drilling and casing of the <br />boreholes. On completion of drilling and casing operations, the cuttings pits will be allowed to dry -out, <br />