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Yoast Mine AHR 2020 <br /> Requirement Requirement citation Comment <br /> 18. Basic Standards for CWQCC regulations 41.4 The Yoast Mine did not generate significant amount of <br /> Ground Water and 41.5 leachates in 2020. <br /> 19. Restoration of ground CDRMS regulation Well YWC33 casing is damaged and prevented water level <br /> water recharge to 4.05.12(3) measurement. For the 2020 water year, it appears that <br /> approximate pre-mining rate water levels at measured wells fell within their historic <br /> ranges. All alluvial wells displayed seasonal water level <br /> fluctuations in response to periods of precipitation <br /> recharge. <br /> 20. Prevention of adverse CDRMS regulation Compliance with the Basic Standards for ground <br /> impacts to ground water 4.05.11(1) water, as per item 10,indicate the permittee is <br /> systems outside permit area preventing adverse impacts to ground water quality <br /> outside the permit area. <br /> Note: Water level reports as presented in Appendix B <br /> of the AHR Hydrology Report did not indicate average <br /> water levels. <br /> All alluvial wells showed seasonal water level <br /> fluctuations in response to periods of precipitation <br /> or, lack thereof. Overburden and coal well water <br /> levels are fluctuating in response to the precipitation <br /> recharge and ground water flow from the reclaimed <br /> mine pits. <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 /> h drolo is 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 2020 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 6 of the 7 sites with no <br /> measurement taken at the 71 site (YWC33). 2020 TDS <br /> values in the alluvial wells remained within the pre <br /> mine ambient measurements for Sage Creek alluvium <br /> or Grassy Creek Alluvium. No material damage has <br /> occurred,as discussed in item 20, above. <br /> 6 <br />