2022-10-25_HYDROLOGY - C1994082 (2)

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1000LORADO .0 Division of Reclamation, Mining and Safety Department of Natural Resources 25 October 2022 Miranda Kawcak Moffat County Mining, LLC 29515 Routt County Road 927 Oak Creek. CO 80467 RE: Yoast Mine Permit; C1994082 Review: Sediment Pond Report 2022 Q2 Dear Ms. Kawcak: Thank you for your submittal of the 2022 quarter two Sediment Pond Report for the Yoast Mine. The Colorado Division of Reclamation, Mining and Safety (The Division), has reviewed the above referenced report. The report was received by the Division on 22 September 2022. Sediment pond inspections were conducted by Jason Herden of Seneca Coal Company on 20 June 2022. The report is in compliance with the applicable sections of Rule 4.05.9. With the exceptions of previously identified maintenance/monitoring items, no maintenance issues were noted during the inspection. All ponds hold water throughout the year. Pond 910 was discharging and Pond 912 was discharging at the time of inspection, outflow was 75 gallons per minute (gpm). Sediment levels were acceptable. Maintenance/monitoring items noted in the report comprise the rusting outlet culvert and cattails at Pond 910. DRMS understands that Seneca Coal Company monitors these items on a regular basis. Thank you for the submission of the 2022 Q2 sediment Pond Report. DRMS has no questions and suggests that maintenance items be addressed before snow and ice prevent access to the site. Best Regards, Robin Reilley,M.S. GISP Environmental Protection Specialist 11 Robin.reilleykstate.co.us F'COI Physical: 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 �4 o0 Mailing: DRMS Room 215, 1001 E 62nd Ave, Denver, CO 80216 https://drms.colorado.gov Fe — Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director 10 'f 1876�`