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Yoast Mine AHR 2021 Water Year 2020 October through 2021 September <br /> Requirement Requirement citation Comment <br /> 21. Prevention of impacts to CDRMS regulation No material damage has occurred, as discussed in <br /> ground water that adversely 4.05.11(2) item 20, above. <br /> impact post-mining land use <br /> 22. Minimize disturbance to CDRMS regulation The disturbance to the hydrologic balance within and <br /> hydrologic balance within 4.05.1(1) adjacent to the permit area caused by mining and <br /> and adjacent to the permit reclamation at the Yoast Mine is the minimum that <br /> area can be expected from a reclaimed surface mine at this <br /> location. The operators' use of best management <br /> practices indicates minimization of disturbance to the <br /> hydrologic balance. <br /> 23. Prevention of material CDRMS regulation Surface water: Aprediction was made that increases in <br /> damage to the hydrologic 4.05.1(1) TDS would be observed at various stream sites during the <br /> balance outside the permit irrigation season (June-September). <br /> area Average TDS at all four sites was lower than predicted <br /> for the 2021 water year. <br /> Ground water: In TAB 17 of the PAP, predictions <br /> were made as to the expected TDS increases to be <br /> observed at various monitoring wells. Predicted TDS <br /> values were exceeded at 5 of the 7 sites with no <br /> measurement taken at site(YWC33). 2021 TDS values <br /> in the alluvial wells remained within the pre mine <br /> ambient measurements for Sage Creek alluvium or <br /> Grassy Creek Alluvium. The slightly elevated measures <br /> could emanate from Lewis Shale bedrock or agriculture. <br /> No material damage has appeared to have occurred, as <br /> discussed in item 20, above. <br /> 24. Agreement of observed CDRMS regulation No local or regional impacts were identified in the <br /> hydrologic impacts with 2.05.6(3) and AHR. This observation is consistent with the PHC. <br /> probable hydrologic requirement to keep <br /> consequences projected in the current, CDRMS <br /> permit. regulation 2.03.3(1) <br /> 25. Adequacy of ground CDRMS regulation The current ground water monitoring program <br /> water monitoring program 4.05.13(1) continues to adequately address the protection of the <br /> hydrologic balance. <br /> 26. Adequacy of surface CDRMS regulation The current surface water monitoring program <br /> water monitoring program 4.05.13(2) continues to adequately address the protection of the <br /> hydrologic balance. <br /> 5 <br />