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Requirement Citation Comment <br /> 18. Parameters to be Table 1; Exhibit DRMS notes that analytes were measured for well 259. Table <br /> analyzed in 29 of CDRMS 1B of the AHR indicates annual analyte monitoring. <br /> groundwater mining permit C- No. 5 Mine Well,was measured for water level and has not <br /> samples 1981-044 been sampled for analytes since July 2013 as power has been <br /> shut off. <br /> The Division compared the 2021 monitoring results for each <br /> well with the Basic Standards of Ground Water and the <br /> Baseline Water data tables provided in Tables 15 to 20 in the <br /> Williams Fork Mine permit. <br /> Regarding the Middle and Trout Creek Sandstone Units, <br /> elevated conductivity were recorded and overall water quality <br /> does not indicate mine related impacts. <br /> well TR-4; conductivity, sodium, sulfate, chloride, and boron <br /> concentrations were lower than in 2020 yet elevated compared <br /> with baseline levels and are below the maximum levels <br /> recorded at the site. The pH levels were above the drinking <br /> water standards and within baseline levels. <br /> Well TR-7a is within the expected flow path of mine leachate. <br /> CWQCC Well TR-7a data indicates the parameters monitored at this well <br /> 19. Basic Standards for regulations are within their baseline water quality levels. The pH levels at <br /> Ground Water 41.4 and 41.5 this well were above and below the drinking water standard and <br /> within the baseline levels. <br /> Well 81-01 sulfate, manganese and iron concentrations were <br /> above the baseline water quality levels for this well and are also <br /> above the basic standards of groundwater. Calcium and <br /> chloride concentrations were above the baseline levels and <br /> below the basic standards for groundwater. Sodium levels are <br /> also above the baseline water quality levels. Magnesium <br /> concentrations were high. <br /> Regarding the Twenty Mile Sandstone;concentrations in Well <br /> 259 and the 9 Mine Well are within historic ranges and <br /> consistent with baseline water quality concentrations. <br /> Conductivity in these two wells fluctuates, spiking in 2020 <br /> and retreating in 2021. <br /> Sodium and calcium showed lower concentrations than in 2019 <br /> and 2020 for the No. 9 Mine Well,while chloride,boron, sulfate <br /> Magnesium where higher in than in 2020. <br /> Williams Fork alluvial wells comprise wells AVF-3,AVF-5 <br /> and AVF-6 and require quarterly monitoring. Regarding the <br /> Williams Fork Alluvium well AVF-3, concentrations were <br /> within the baseline water quality levels and with the exception <br /> of Manganese, lower than 2020 measurements. <br /> Page 4 <br />