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C 0 L 0 R A D 0 <br /> Division of Reclamation, <br /> Ago-.40 <br /> Mining and Safety <br /> Department of Natural Resources <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203 <br /> August 13, 2019 <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. 132 (TR-132) <br /> Adequacy Review <br /> Dear Mr. Tennyson: <br /> After reviewing TR-132 from Colowyo Coal Company L.P. (Colowyo),the Division has the following <br /> comments: <br /> 1. When reviewing the proposed Exhibit 7 — Hydrology Information, it appears that Lower <br /> Administration Building Small Area Exemption and Haul Road A Upper and Lower Ditches Exhibits <br /> have been left out of the Table of Contents under Volume 2B. Please provide an updated Exhibit 7 — <br /> Hydrology Information to include the missing exhibits. <br /> 2. It appears to the Division that the watershed acreage in the proposed Exhibit 7 — Table 6 and the <br /> proposed Exh. 7 — Sec 16 — Figure 2 do not match up. The following tables shows the acreage <br /> discrepancies. <br /> Watershed Area -Section 16 Pond <br /> Table 6 Exhibit 7—Section <br /> (acres) <br /> 16 <br /> Designation (acres) <br /> Topsoil/Seed 24.7 21.9 <br /> Undisturbed 36.6 81.1 <br /> 1-2 Yrs. 29.1 39.5 <br /> 3+Yrs. 194.9 38.6 <br /> Total Area 285.3 269.1 <br /> Please provide the Division with a corrected acreage for either of the above mentioned exhibits. <br /> 3. When reviewing the proposed active mining hydrologic case for the Section 16 hydrology model, it <br /> appears to the Division that the wrong curve number (CN) was used for the areas designated as <br /> .OF'Cpl\ <br /> 0 <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 http://mining.state.co.us <br /> i <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director 1876� <br /> ---_ <br />