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October 12, 2018 <br />Ms. 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 />Twentymile Coal LLC <br />Foidel Creek Mine <br />29515 RCR 27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />RE: Twentymile Coal, LLC - Foidel Creek Mine (Permit No. C-82-056), Technical Revision (TR18-91) <br />Wash Plant Additional Thickener Tank System, Adequacy Response <br />Dear Ms. Lynch: <br />Below you will find responses to the adequacy review issues that were noted in the adequacy review dated <br />September 26`h, 2018. <br />• Issue #1: Please provide an updated pond design for Pond D <br />a. Included in this submittal is an insert for Exhibit 08-H3 showing the planned modifications and <br />updated pond design for Pond D. Please insert this exhibit into EX08-H3 of our permit. <br />• Issue #2: Please provide dimensions and foundation information for the Deaeration Tank and Clarified <br />Water Tank <br />a. Deaeration tank <br />i. The deaeration tank will not require a foundation, it will be installed and secured with <br />brackets to hung from the side of the thickener tank. <br />b. Clarified Water Tank: <br />i. The clarified water tank will be 12 feet in diameter and will require a slab foundation <br />approximately 14 feet in diameter and will be 1 foot thick. <br />Additionally, we have provided an updated design drawing with more civil design details. This drawing should be <br />inserted in Exhibit 49K, Washplant Design Drawings, replacing the original submitted drawing. Updates include <br />more details regarding elevations of the structures, building details, newly added retaining wall in order to elevate <br />the thickener tank to allow for adequate pump performance when pumping out the thickener, design location <br />relative to Pond D, and a detailed location on the pre -sediment sump between the thickener tank and pond D. <br />If you have any questions or concerns please do not hesitate to contact me regarding this response, 970-870-2718. <br />Sincerely, <br />Miranda Kawcak <br />Environmental Engineer <br />mblomquist@peabodyenergy.com <br />970-870-2718 <br />