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Point of Compliance Well Investigation <br /> <br /> <br /> <br />AECOM <br />3 <br /> <br />decided to undertake a groundwater characterization study of the Wilson Creek, Taylor Creek, <br />and Good Spring Creek alluvial groundwater systems to identify appropriate point of compliance <br />well locations on land owned by the Mine. This groundwater study, initiated in 2019, consisted <br />of installing several temporary monitoring wells within each drainage, and sampling each well <br />for a period of one year to establish baseline chemistry. Baseline sampling of the temporary <br />wells was conducted from October 2019 to November 2020. Results from the alluvial <br />groundwater investigation and baseline sampling program are presented in this report. <br />The 2019-2020 alluvial groundwater characterization study had four main objectives: <br />1. To understand spatial trends in alluvial groundwater chemistry within the Wilson, Taylor, <br />and Good Spring Creek drainages; <br />2. To establish site-specific background concentrations for alluvial groundwater using data <br />from Colowyo’s upgradient and downgradient monitoring wells; <br />3. To define comparison values for assessing groundwater compliance using a hybrid <br />approach that combines site background concentrations and table value standards from <br />the Water Quality Control Commission’s Regulation No. 41 – The Basic Standards for <br />Ground Water (5 CCR 1002-41); and <br />4. To identify permanent compliance well locations on land owned by the Mine where the <br />alluvial groundwater chemistry would generally meet compliance standards. <br />These objectives are addressed in this report, and recommendations are made for permanent <br />point of compliance well locations. <br />