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COLORADO <br /> ® C 0 Division of Reclamation, <br /> mil. Mining and Safety <br /> Department of Natural Resources <br /> February 17,2021 <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 /> Minor No.230(MR-230) <br /> Adequacy Review <br /> Dear Mr.Tennyson: <br /> After reviewing MR-230 from Colowyo Coal Company L.P.(Colowyo),the Division has the following <br /> comments: <br /> 1. It appears to the Division that an error was found with Table 13C-24 on proposed page Exhibit 13C, <br /> page 16.When reviewing the Table 13C-23,the Collom Pit cut volume was increase by 8 million <br /> c.y.however,there has been no increase to Table 13C-24 for the volume associated with the Collom <br /> Temporary Spoil Pile.Please provide an updated Table 13C-24 to include the additional volume <br /> from the Collom Pit cut that will be placed at the Temporary Spoil Pile.If this is not an error,please <br /> provide the Division with additional details regarding the additional volume from the Collom Pit cut. <br /> 2. The Division has performed a reclamation cost estimate to reclaim the additional spoil from the Collom <br /> Temporary Spoil Pile(see comment 1)associated with the Collom Pit.The total value of this estimate <br /> is$13,061,988.00(see attached cost estimate).The Division's cost estimate is consistent with previous <br /> cost estimates approved by both the Division and Colowyo. The Division respectfully requests a <br /> response from Colowyo with any questions regarding the cost estimate or an acceptance of the <br /> Division's estimate. Additionally,the Division has provided a"liability tracker"(see Figure 1 below) <br /> showing all approved liability increases since MT-8 as well as required liability and liability held by <br /> the Division.You will also notice the proposed amount for the Colowyo Mine TR-145 is included in <br /> the"liability tracker''to assist with showing total proposed liability for the Colowyo Mine. <br /> If you have any questions,feel free to contact me. <br /> Sincerely, <br /> OF CO10 <br /> 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 /> * <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director 1876 <br />