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for this site. However,the Middle Sandstone (well TR-7a), and <br /> the Williams Fork alluvium(well AVF-5)are monitored. Well <br /> TR-7a is within the expected bedrock flow path of mine <br /> leachate, should the mine discharge leachate to bedrock units. <br /> The AVF-5 well is within the expected alluvial flow path of <br /> leachate, should the mine discharge leachate to Williams Fork <br /> River alluvium. Both wells meet the qualifications of a <br /> compliance point as per qualifications listed in Section <br /> 4.05.13(1)(b)of the Rules. <br /> Monitoring data from both wells indicate the mine has likely <br /> not caused an exceedance of the Basic Standards for Ground <br /> Water. According to section 2.04.7 of the permit,for the <br /> Williams Fork Alluvium;dissolved solids,iron,lead, <br /> manganese and sulfate often exceed the drinking water <br /> standards naturally. Monitoring data does indicate that <br /> manganese levels in AVF-5 often exceed the drinking water <br /> limit. <br /> MCM turned off the mine pumps in July of 2013. Some wells <br /> reacted to the pumps being turned off. Water levels increased <br /> or have remained stable in recent years. However,water levels <br /> in well 83-03 continue to decrease. <br /> Water levels in Middle Sandstone formation are measured in <br /> wells TR-4,TR-7, 81-01, 83-01, 83-02, and 83-03 and show a <br /> 20. Restoration of general rising trend,with the exception of well 83-03,although <br /> ground water CDRMS over time fluctuations have been recorded in all wells. <br /> recharge to regulation Seasonal fluctuations are also noted. <br /> approximate pre- 4.05.12(3) Twenty Mile Sandstone exhibited no apparent change in water <br /> mining rate levels attributable to mining as per the Annual Hydrology <br /> Report. Water levels in Well 84-01 appeared stable in 2020. <br /> No explicit mention of 2020 water levels was apparent in the <br /> data for well 259. Table 1B of the AHR indicates quarterly <br /> monitoring of water level is required for this well. Please <br /> inform DRMS that water level was measured for well 259 in <br /> 2020. <br /> 21. Prevention of Comparisons with the Basic Standards for ground water and the <br /> adverse impacts to CDRMS baseline water data are discusses in item 19 above. MCM <br /> ground water regulation believes that no significant impacts from mining occurred in <br /> systems outside the 4.05.11 the groundwater system as a result of mining. <br /> permit area <br /> 22. Impacts to ground The post mining land uses comprise rangeland/wildlife and <br /> water that adversely CDRMS pastureland. See items 19,20, and 21 above. <br /> impact the post regulations <br /> mining land use 4.05.1(2) and <br /> within the permit 4.05.11 <br /> area <br /> MCM reports that no significant,unpredicted,or adverse <br /> 23. Minimization of impacts were noted during groundwater hydrologic monitoring <br /> disturbance to the CDRMS for 2020. <br /> hydrologic balance regulation <br /> within and adjacent 4.05.1(1) <br /> to the permit area <br /> Page 5 <br />