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Peabod <br />1111 ENERGY <br />Twentymile Coal, LLC 29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />Tabetha Lynch, Environmental Protection Specialist April 18, 2019 <br />Division of Reclamation, Mining, and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />(303) 866-3567 X 8147 <br />RE: Twentymile Coal, LLC - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR18-313) — <br />Thickener Pipeline Route Modification <br />Dear Ms. Lynch: <br />Twentymile Coal, LLC (TC) requests CDRMS approval of a Minor Revision to our existing approved Permit <br />for the modification of the Thickener Underflow pipeline route (MR -311). Currently the approved route for the <br />pipeline comes from the Northwest comer of the washplant building, crosses to the north side of Haulroad C and <br />then crosses under the creek and railroad tracks before paralleling Haulroad C all the way down to the West <br />entrance of the mine and then to the boreholes. The new proposed route will still place the pipeline in the same <br />approved corridor as the original pipeline from the boreholes to the Foidel Creek crossing northwest of Pond D. <br />The modified route would then bring the pipeline from the crossing and turn it to route around to the south side <br />of pond D and parallel Haulroad B around Pond D and then down the driveway to the new Thickener Tank <br />location. This proposed route will encounter less crossings with other pipelines and will allow us to avoid <br />digging around the electrical substation near the washplant. Additionally, TC is proposing to place a 3 inch <br />water line in the ditch alongside the thickener line which would tie in at the de -sander building on the west side <br />of Pond D and go to the booster pump building for wash down water. For these modifications there will be no <br />new surface disturbance, and drainage from this area will be addressed by the existing drainage and sediment <br />control systems. TC is proposing to bore under the overland conveyor, the railroad tracks, and Foidel Creek in <br />one long bore to avoid any exposure to the creek and operations. <br />This submittal includes a revision application form, revised PAP text (page 2.05- 84.7) addressing the additional <br />thickener line and location, and a revised Map 24 showing the proposed line location. This revision should cause <br />no increase or decrease in the bond amount and therefore no bond estimate is necessary. We would like to <br />proceed with this project as soon as possible. We, therefore, appreciate your consideration, cooperation, and <br />assistance in facilitating timely review and approval of this revision application. After you have opportunity to <br />review the accompanying information, please feel free to contact me with any questions or to discuss submittal <br />materials or related matters. <br />Sincerely, <br />Twentymile Coal, LLC <br />e6' " lea � <br />Miranda Kawcak <br />Environmental Engineer <br />