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Foidel Creek Mine C-82-056 2021 Annual Hydrology Report <br /> of decades and declined by approximately 2000 mg/L at 006-82-74C (-1700 mg/L) during this <br /> time. <br /> The two Wolf Creek Overburden wells, WC008A and WC013A, were installed in the 2015 water <br /> year. Less groundwater is expected to be encountered during mining of the Wolf Creek Reserve, <br /> given the lengthy history of dewatering within the Wadge workings which overlie the Wolf Creek <br /> Reserve. The water level at WC008A has fluctuated in a small range near approximately 6700 ft <br /> since 2015, however, the water level at WC013A has slowly declined from approximately 5540 ft <br /> in May 2015 to approximately 5510 ft in 2020 but has since rebounded. TDS have remained <br /> stable at both wells. <br /> There were no anomalous water quality impacts attributable to mining were evident in data <br /> collected from Wadge Overburden wells during 2021, when compared to historical results. <br /> Twentymile Sandstone: <br /> TC monitors three wells screened within the Twentymile Sandstone. Well 006-BRDH-7 is <br /> monitored for water levels and field parameters only on a semi-annual basis and wells FBR-2, and <br /> 97013TM are monitored for water levels and field parameters on a semi-annual basis and water <br /> quality parameters on an annual basis. All monitoring requirements were completed at these sites <br /> in 2021. <br /> The potentiometric surface in the Twentymile Sandstone generally slopes from southwest to <br /> northeast. The water levels measured in wells 006-BRDH-7, FBR-2, and 97013TM in 2021 are all <br /> within their historic range and have remained relatively stable over the last five years. Field <br /> conductivity at 006-BRDH-7 exhibits a negative trend, with conductivity dropping from around 850 <br /> pmhos/cm in 1987 to 560 pmhos/cm in 2021. TDS at FBR-2 has also exhibited a negative trend <br /> since 2007, with the current TDS being measured as 1060 mg/L. The 748 mg/L TDS measured at <br /> 97013TM in 2021 remains within the historic range observed at the well. <br /> Trout Creek Sandstone: <br /> TC monitored five Trout Creek Sandstone wells in 2021: 001-83-106, 001-83-107, 95M001, FBR- <br /> 2-E, and 97013TC. Note that per TR03-42, monitoring frequency for water levels and field <br /> parameters were reduced to an annual basis at all five wells and water quality sampling was <br /> 9 <br />