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COLORADO <br /> v dDivision of Reclamation, <br /> Mining and Safety <br /> Department of Natural Resources <br /> 13 December 2021 <br /> Miranda Kawcak <br /> Moffat County Mining, LLC <br /> 29515 Routt County Road#27 <br /> Oak Creek, CO 80467 <br /> RE: Yoast Mine Permit; C1994082 <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 Yoast 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, Jenna Spencer and Jason Herden of Seneca Coal Company. The report is in compliance <br /> with the applicable sections of Rule 4.05.9. Engineer certifications of the ponds generally occurs in quarter <br /> three. <br /> Inspections for years 2021, 2020 and 2019 occurred as per Table 1,below. <br /> Table I: Annual Inspection Frequency <br /> Year Quarter Date Quarter Date Year Quarter Date <br /> Inspection <br /> Q4 23-Nov Q4 22-Oct Q4 23-Oct <br /> Frequency 2021 Q3 16-Oct 2020 Q3 24-Sep 2019 Q3 <br /> Q2 14-Jun Q2 2-Jun Q2 11-Jun <br /> Q 1 I Q 1 2-Mar Q 1 11-Mar <br /> All ponds hold water throughout the year. Ponds 010 and 012 generally discharge throughout the year. 2021 <br /> was a drought year and Pond 010 did not discharge. Pond 011 tends to discharge during Q2 and holds water <br /> throughout the year. Sediment levels were acceptable. <br /> Maintenance/monitoring items noted comprise a known native spring near the Pond 013 dam, and the <br /> rusting outlet culvert at Pond 010. DRMS understands that Seneca Coal Company monitors these items on a <br /> regular basis. <br /> With a couple of exceptions,the pond inspections were received by the Division in bulk in December of <br /> 2021 for the past three years. The Division strongly urges Seneca Coal Company to submit the reports in a <br /> timely manner, specifically,by the month following the inspection. <br /> �4 OF c <br /> Q <br /> I fn O <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 />