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s COLORADO <br />Division of Reclamation, <br />Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />March 14, 2018 <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. 118 (TR -116) <br />Adequacy Review <br />Dear Mr. Tennyson: <br />After reviewing TR -1 18 from Colowyo Coal Company L.P. (Colowyo), the Division has the following <br />comments: <br />1. The Division has corrected its internal network issues and has calculated an updated Exhibit 13C - <br />Cumulative Bond Schedule as well as the reclamation cost estimate (RCE) liability increase associated <br />with the changes proposed with TR -118. Attached are both documents. It should be noted that the total <br />amount associated with the Exhibit 13C is merely an update to include all items proposed with the <br />Cumulative Bond Schedule and not the RCE liability increase associated with the changes proposed <br />with TR -1 18. The majority of tasks associated with the Cumulative Bond Schedule have been <br />previously approved through the Division's revisions process or accounted for in the approved <br />Colowyo Exhibit 13A - Reclamation Cost Estimate last updated with Midterm No. 7. The total value <br />of this proposed TR -118 RCE liability increase is $820,776.56 (see attached cost estimate). The <br />Division's cost estimate is consistent with previous cost estimates approved by both the Division and <br />Colowyo. The Division respectfully requests a response from Colowyo with any questions regarding <br />the cost estimate or an acceptance of the Division's estimate. <br />Additionally, attached is a table with a brief summary of what changes occurred with its associated task. If you <br />have any questions, feel free to contact me at any time. <br />Sincerely, <br />i <br />� I <br />Zach Trujillo <br />-C <br />1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br />John W. Hickentooper, Governor I Robert W. Randall, Executive Director I Virginia Brannon, Director * 1876 <br />