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Yoast Mine AHR 2021 Water Year 2020 October through 2021 September <br /> Review of Annual Hydrology Report <br /> Mine: Yoast Mine Date Reviewed: January 2023 <br /> Permit No: C-1994082 Reviewed By: R. Reilley M.S, GISP <br /> Report Year: 2021 Submitted By: Seneca Property, LLC <br /> Date Received: 28 April 2022 <br /> Water Year 2020 October through 2021 September <br /> Requirement Requirement citation Comment <br /> 1. Filing frequency of CDRMS regulation The Annual hydrology Report is required to be <br /> hydrology report 4.05.13(4)(c) submitted yearly. <br /> 2. Timely filing of hydrology CDRMS regulation The Annual hydrology Report is required to be <br /> report 4.05.13(4)(c) submitted by February 28 and was received by the <br /> Division on 28 April 2022 via electronic filling. <br /> 3. Filing frequency of NPDES permit COG- Filling is quarterly, and were not relayed to DRMS in a <br /> NPDES Discharge Monitoring 0000221 timely manner. <br /> Reports <br /> 4. Timely filing of Discharge NPDES permit COG- Filling is quarterly although sampling frequency is monthly, <br /> Monitoring Reports 0000221 and were not relayed to DRMS in a timely manner. <br /> 5. Filing frequency of pond CDRMS regulation The sediment ponds associated with C 1994082 <br /> reports 4.05.9(17) include 010, 011,011A, 012, 012A, 013, and 014. <br /> uarterl and inspections appear to have been <br /> 6. Timely filing of pond CDRMS regulation Quarterly pond inspection reports were not submitted <br /> reports 4.05.9(17) and received by the Division within an appropriate <br /> time frame. <br /> 7. Content of pond reports CDRMS regulation Content appeared adequate. Pond inspections in <br /> 4.05.9(15) water year 2021 were submitted intermittently <br /> 8. Sampling frequency of NPDES permit COG- It appears that frequency for sampling was complied <br /> NPDES outfalls 0000221 with. <br /> 9. Parameters to be sampled NPDES permit COG- All parameters were met. <br /> for NPDES reporting 0000221 <br /> 10. NPDES NPDES permit COG- The Yoast Mine discharged from Ponds 010, 012 during <br /> discharge limitations 0000221 the water year, 011, 013, and 014 did not discharge <br /> during the 2021 water year. Based on a Memorandum <br /> of Understanding between the Division of Reclamation, <br /> Mining and Safety and the Water Quality Control <br /> Division (WQCD), the WQCD will be responsible for <br /> enforcing CDPS permit conditions. <br /> 2 <br />