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COLORADO <br /> \/ Division of Reclamation, <br /> ® Mining and Safety <br /> Department of Natural Resources <br /> November 23,2021 <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 /> Technical Revision No. 150(TR-150) <br /> Adequacy Review <br /> Dear Mr. Tennyson: <br /> After reviewing TR-150 from Colowyo Coal Company L.P.(Colowyo),the Division has the following <br /> comments: <br /> 1. Please justify the use of weighted averages in Table 1 to develop a salinity tolerance for an entire <br /> field,rather than looking at tolerance for individual crop species. It is the opinion of the Division <br /> that if a farmer is using irrigation water with high TDS concentrations it could likely impact the <br /> yield of sensitive crops(or moderately sensitive crops such as alfalfa)regardless of the other <br /> types of crops grown in that field. <br /> This concludes the Division's adequacy review for the Colowyo TR-150. If you have any questions,feel free <br /> to contact me. <br /> Sincerely, <br /> Zach Trujillo <br /> Environmental Protection Specialist <br /> (303) 866-3567 ext. 8164 <br /> Zach.Trujillogstate.co.us <br /> flF'�010 <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 />