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COLORADO <br /> \/ Division of Reclamation, <br /> ® Mining and Safety <br /> Department of Natural Resources <br /> January 3,2022 <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. 157(TR-157) <br /> Adequacy Review <br /> Dear Mr. Tennyson: <br /> After reviewing TR-141 from Colowyo Coal Company L.P. (Colowyo),the Division has the following comments: <br /> 1. Currently with the issuance of Technical Revision No. 154,the Colowyo Mine reclamation plan is approved for spoil <br /> to remain out of pit permanently near the Collom Pit along with a total of 6,608,464 c.y. of temporary spoil to be <br /> transported and used to finish backfilling the remaining portion ofthe Collom Pit once mining has concluded. However, <br /> ifthe Division were to currently perform the reclamation at the Collom Pit,it is unclear if the 6,608,464 c.y.of temporary <br /> spoil would be sufficient to backfill the Collom Pit as it is currently is as well as future approved mining progression. <br /> Please provide the Division with additional information showing that the 6,608,464 c.y. of temporary spoil is sufficient <br /> to backfill the maximum extent of volume necessary at the Collom Pit or with the amount of temporary spoil that will <br /> be needed to backfill the maximum extent of volume necessary at the Collom Pit. <br /> If you have any questions,feel free to contact me. <br /> Sincerely, <br /> Zach Trujillo <br /> Environmental Protection Specialist <br /> (303) 866-3567 ext. 8164 <br /> Zach.Truj illo@state.co.us <br /> flF'�010 <br /> I n O <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 />