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Twentymile Coal, LLC <br /> Peabod Foidel Creek Mine <br /> 29515 RCR 27 <br /> Oak Creek,CO 80467 <br /> 97 �f19.E® <br /> August 22, 2018 �- V <br /> AUG 2 4 2018 <br /> Divisionetha Lynch,of Reclamation, Mining,Taand Safetyn Specialist Division'n f Reclamation, <br /> 1313 Sherman Street, Room 215 9&Safety <br /> Denver, Colorado 80203 <br /> (303) 866-3567 X 8147 <br /> RE: Twentymile Coal,LLC -Foidel Creek Mine(Permit No. C-82-056),Technical Revision(TR18-91) <br /> Wash Plant Additional Thickener Tank System <br /> Dear Ms. Lynch: <br /> Twentymile Coal, LLC (TC) requests CDRMS approval of a Technical Revision to our existing approved Permit <br /> for construction, operation, and reclamation of the addition of a second Thickener tank and ancillary equipment at <br /> the west side of the Wash Plant facilities. This addition is necessary to accommodate the foreseen high volumes of <br /> Thickener that will be obtained during the coal washing process. <br /> The addition of a second Thickener tank will consist of a 90 foot diameter thickener tank that will be supported by <br /> an estimated 108 one foot diameter caissons drilled 20 feet into the ground. On top of the caissons a 12 inch thick <br /> concrete pad will be poured as the base of the thickener tank. Surrounding the thickener tank will be a 30 X 40 <br /> structure that will house the pumps and equipment necessary for the Thickener system. There will also be a de- <br /> aeration tank and a clarified water tank plumbed into the thickener tank. The thickener will leave the tank through a <br /> double walled HDPE pipe with an 8 inch diameter pipe inside a 12 inch outside diameter pipe and be pumped <br /> underground into the old mine workings at designated areas. <br /> Detailed design, operations, and reclamation information for the proposed activities is provided as both revised <br /> PAP text and exhibits; and revised maps, reflecting the location and configuration of the new facilities, pipelines, <br /> and roads. New and revised PAP materials are identified by the attached Summary of Revisions/Additions. <br /> We would like to proceed with this project ASAP to avoid any operation delays. We, therefore, appreciate your <br /> consideration, cooperation, and assistance in facilitating timely review and approval of this Technical Revision <br /> application. After you have opportunity to review the accompanying information, please feel free to contact me <br /> with any questions or to discuss submittal materials or related matters. <br /> Sincerely, <br /> -)I1 vau)c"UK <br /> Miranda Kawcak <br /> Environmental Engineer <br /> mblomquist@peabodyenergy.com <br /> 970-870-2718 <br /> cc: Ed Brady/TC <br /> Jerry Nettleton <br />