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COLORADO <br /> \/ Division of Reclamation, <br /> ® Mining and Safety <br /> Department of Natural Resources <br /> January 26,2022 <br /> Tony Tennyson <br /> Colowyo Coal Company L.P. <br /> 5731 State Highway 13 <br /> Meeker,CO 81641 <br /> Re: Colowyo Coal Mine (Permit No. C-1981-019) <br /> Technical Revision No. 158(TR-158) <br /> Adequacy Review <br /> Dear Mr.Tennyson: <br /> After reviewing TR-158 from Colowyo Coal Company L.P.(Colowyo),the Division has the following comments: <br /> 1. The Division has performed a cost estimate to determine the cost associated with the proposed updates to the Prospect <br /> Drainage proposed under TR-158.The total liability amount calculated by this estimate is$100,910.00(see attached <br /> cost estimate).The Division's cost estimate is consistent with previous cost estimates approved by both the Division <br /> and Colowyo.The Division respectfully requests a response from Colowyo with any questions regarding the cost <br /> estimate or an acceptance of the Division's estimate. <br /> 2. When reviewing proposed Appendix Exh. 7-14PP,page 1,paragraph 1,it refers to EP3 Inlet and Outlet profiles being <br /> presented on proposed Map 33.Reviewing proposed Map 33,these two ditch profiles were not included.Please provide <br /> an updated Map 33 including the profiles of EP3 Inlet and Outlet Ditches. <br /> 3. There appears to be a typo found on Appendix Exh. 7-14PP,page 1,under paragraph 4 of the Prospect Pond section <br /> referring to the "Prospection Collection Ditch".Please provide updated page 1 of the proposed Appendix Exh. 7-14PP <br /> with a corrected reference to the Prospect Collection Ditch. <br /> 4. There appears to be an error in figure designation associated with proposed Appendix 7-14S15.Both associated Figures <br /> have been labeled as Figure Exh.7-14S 15-2 for the Pond Drainage Areas—Post Mining Condition and Section 15 Pond <br /> Design.Please provide and updated Figure with the corrected naming designation. <br /> 5. When reviewing proposed Appendix 7-14S15, page 1, paragraph 1 there appears to be reference errors to figures <br /> associated with this appendix.For Pond Drainage Areas—Post Mining Condition,it refers to Figure Exh.7-14Q-1 and <br /> for the Section 15 Pond Design it refers to Figure Exh.7-14Q-2.Please provide updated references to the correct Figures <br /> (see Comment 3). <br /> The following adequacy comments are in reference to the associated 10—year, 24—hour and 25 —year, 24—hour SedCAD <br /> modes under proposed Appendix Exh. 7-14PP: <br /> flF'�010 <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director * 1876 * <br />