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Peab i <br />1111 ENERGY <br />Twentymile Coal, LLC <br />Tabetha Lynch, Environmental Protection Specialist <br />Division of Reclamation, Mining, and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />(303) 866-3567 X 8147 <br />RECEIVED <br />SEP 252018 <br />VIVISIaN (,, t'�ECLAM <br />MINING qNp SAFM pIy <br />29515 Routt County Road 27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />September 21, 2018 <br />RE: Twentymile Coal, LLC - Foidel Creek Mine (Permit No. C-82-056), Minor Revision (MR18-311) — <br />Second Thickener Pipeline and Refuse Bin Modification <br />Dear Ms. Lynch: <br />Twentymile Coal, LLC (TC) requests CDRMS approval of a Minor Revision to our existing approved Permit <br />for installation of a second Thickener Underflow Pipeline parallel to the existing pipeline traveling from the <br />washplant to the Southwestern Mining district borehole sites. In addition, TC is also requesting the approval to <br />make minor modifications to the existing Refuse Bin to accommodate for the use of larger haul trucks. The <br />pipeline will involve excavating the along the existing pipeline corridor and installing a new double walled <br />Thickener pipe that will tie in to the existing man holes and will consist of a 12 inch outer pipe with an 8 inch <br />inner pipe to accommodate for larger volumes of thickener to be pumped from the washplant to the boreholes. <br />The refuse bin modification will consist of moving the bin approximately 33 feet to the south and installing 4 <br />new taller caissons for height clearance and a new concrete drive on slab under the refuse bin. For both of these <br />modifications there will be no new surface disturbance, and drainage from this area will be addressed by the <br />existing drainage and sediment control systems. . <br />This submittal includes a revision application form, revised PAP text (TOC pg. xii, pgs. 2.05-29.1, 30, and 84.7, <br />and Exhibit 49M slip -sheet) addressing the relocation of the refuse bin and the installation and reclamation of <br />the second thickener pipeline, a revised Map 24 showing the refuse bin re -location, and a bond estimate. We <br />would like to proceed with this project as soon as possible, in order to take advantage of the summer <br />construction season. We, therefore, appreciate your consideration, cooperation, and assistance in facilitating <br />timely review and approval of this revision application. After you have opportunity to review the accompanying <br />information, please feel free to contact me with any questions or to discuss submittal materials or related <br />matters. <br />Sincerely, <br />Twentymile Coal, LLC <br />Miranda Kawcak <br />Environmental Engineer <br />