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COLORADO <br /> Division of Reclamation, <br /> Mining and Safety <br /> Department of Natural Resources <br /> May 14, 2020 <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.216(MR-216) <br /> Adequacy Review <br /> Dear Mr. Tennyson: <br /> After reviewing MR-216 from Colowyo Coal Company L.P. (Colowyo),the Division has the following <br /> comments: <br /> 1. When reviewing proposed Exhibit 7-25A, it was observed that there was a reduction in stem spacing <br /> and flow used in the sediment control exemption demonstration. Stem spacing was reduced from <br /> 0.86 in. to 0.67 in. and the flow was reduced from 1.17 cfs to 0.36 cfs.Please provide the Division <br /> with additional rationale behind the reduction in stem spacing and flow used in the sediment control <br /> exemption demonstration. <br /> 2. There appears to be to a typo in proposed Exhibit 27,Item 3 under the second paragraph of Section II <br /> with the use of"aCropriate time". Please provide an updated page 1 for the proposed Exhibit 27, <br /> Item 3. <br /> 3. The Division has performed a reclamation cost estimate to reclaim the additional Collom in-pit drill <br /> holes and associated drill pads. The total value of this estimate is$131,225.00(see attached cost <br /> estimate)and is based on the difference of what is proposed under MR-216 and what is currently <br /> approved(Task#470 of the MT-08 RCE). 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. <br /> If you have any questions, feel free to contact me. <br /> Sincerely, <br /> of,CO <br /> y ' <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us I <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director **1876 * <br />