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Foidel Creek Mine C-82-056 2021 Annual Hydrology Report <br /> been declining rapidly. Field conductivity and TDS at the Trout Creek Sandstone wells remained <br /> within historic ranges at all locations in 2021. <br /> Fish Creek Sandstone: <br /> Two Fish Creek Sandstone wells (91 M001 and 91 M004) require monitoring on a semiannual <br /> basis for water level only. An additional well (Ashley) requires semi-annual monitoring for water <br /> levels and field parameters, and annual water quality sampling. The water level at Ashley could <br /> not be monitored during the report due to access issues. 91 M004 was dry 2012 through 2015 and <br /> in 2017 through 2018. Well 91 M004 was destroyed in 2019 due to snow removal efforts by <br /> Yampa Valley Electric to repair a power line. TC will discuss this situation with DRMS. <br /> The water levels at 91 M001 and Ashley were declining during the report period. The TDS at the <br /> Ashley well was 576 mg/L in 2020. TDS had been declining between 1995 and 2020 but rose in <br /> 2021. The 2021 concentration is near the baseline concentration for the well. <br /> 11 <br />