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DNR <br />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 />November 12, 2020 <br />Tony Tennyson <br />Tri-State Generation and Transmission Association <br />1100 West 116 b Avenue <br />Westminster, CO 80234 <br />Re: Colowyo Coal Company, Permit No. C-1981-019 <br />Review of 2018 and 2019 Annual Hydrology Reports (AHRs) <br />Dear Mr. Tennyson: <br />The Colorado Division of Reclamation, Mining and Safety (the Division) has reviewed the 2018 <br />and 2019 AHRs for the Colowyo Mine in the context of Rules 4.05.1, 4.05.6, 4.05.11, and <br />4.05.13 (Regulations of the Colorado Mined Land Reclamation Board for Coal Mining) and <br />considering the ongoing conversations about the 2017 AHR between the Division and Tri-State <br />Generation and Transmission Association (Tri-State). <br />Table 1 lists several important logistical requirements of the Colowyo Mine water monitoring <br />plan, and indicates if the requirement was met in the 2018 and 2019 AHRs. <br />Table 1 Requirements of the Colowyo Mine Water Monitoring Plan <br />Requirement <br />Regulation or other source <br />Requirement <br />of requirement <br />met for 2018 <br />and 2019? <br />Filing frequency of AHR - annually <br />Rule 4.05.13 (4) (c) <br />yes <br />Timely filing of hydrology report - submitted <br />Section 2.04.13 of the <br />yes <br />by March 15 each year. <br />Colowyo Mine PAP. <br />Sites sampled and sampling frequency at <br />Section 4.05.13 of PAP <br />Unclear <br />surface water monitoring sites <br />Collom Rule 4 <br />Parameters sampled at surface water <br />Section 4.05.13 of PAP <br />yes <br />monitoring sites <br />Collom Rule 4 <br />Sites sampled and sampling frequency at <br />Section 4.05.13 of PAP <br />yes <br />groundwater monitoring sites <br />Collom Rule 4 <br />Parameters sampled at groundwater <br />Section 4.05.13 of PAP <br />yes <br />monitoring sites <br />Collom Rule 4 <br />OF COlO <br />�4�= <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 />Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director * * 1876 * <br />