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COLORADO <br /> a Division of Reclamation, <br /> Mining and Safety <br /> Department of Natural Resources <br /> 10 December 2021 <br /> Miranda Kawcak <br /> Moffat County Mining, LLC <br /> 29515 Routt County Road 927 <br /> Oak Creek, CO 80467 <br /> RE: Seneca Mine Permit; C1982057 <br /> Sediment Pond Inspections DRMS Review years 2021,2020 and 2019 quarters: <br /> Dear Ms. Kawcak: <br /> Thank you for your submittal of the pond reports for the Seneca IIW Mine. The Colorado Division of <br /> Reclamation, Mining and Safety (The Division) has reviewed the above referenced reports. The reports <br /> were received by the Division on 8 December 2021. Sediment pond inspections were conducted by <br /> Miranda Kawcak and Jason Herden of Seneca Coal Company. The report is in compliance with the <br /> applicable sections of Rule 4.05.9. <br /> Inspections for years 2021, 2020 and 2019 occurred as per Table 1,below. <br /> Table I: Annual Inspection Frequency <br /> Year Quarter Date Year Quarter Date Year Quarter Date <br /> Inspection Q 4 27-Oct Q 4 22-Oct Q 4 23-Oct <br /> Frequency 2021 Q 3 23-Sep 2020 Q 3 24-Sep 2019 Q 3 19-Sep <br /> Q 2 14-Jun Q 2 1-Jun Q 2 10-Jun <br /> Q 1 2-Mar I I Q 1 I 11-Mar <br /> Ponds 006 and 016 discharge throughout the year. Ponds 015, and 017 tend to discharge during Q1 and Q2 <br /> and hold water throughout the year. <br /> Sediment levels were acceptable. <br /> The following structures have achieved bond release: <br /> O Ponds 005, 009, <br /> O Stock Tanks T-1, T-5, T-18, T-20, T-22, T-24, T-25, T-26 and T-27 <br /> Maintenance/monitoring items noted comprise a known slump at Pond 006, a spring near the Pond 005 <br /> dam, and an occasional seep at Pond 016. DRMS understands that Seneca Coal Company monitors these <br /> items on a regular basis. <br /> flF'�010 <br /> 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 https://drms.colorado.gov <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director * 1876 * <br />