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Nix Site Groundwater Contamination Potential <br /> March 31, 2023 <br /> Pwik <br /> 1e 1 <br /> * 1 1 <br /> y 1 <br /> ' A 1 1 B t <br /> Nix Permit Boundary <br /> s <br /> • i -•- Proposed Slurry Wall Locations <br /> ws <br /> 1 Wells Potentially Providing Drinking Water <br /> o Agricultural Wells <br /> Directions of Groundwater Flow <br /> 1 Saint Vrain Creek <br /> ti 9 4793 <br /> n° 1 <br /> #` 1 ►� n 4789 <br /> t 1=. <br /> ——————-—„?m 47as Groundwater Elevation <br /> (ft msl,Jan 2023) <br /> ,,yjjjfff JJ,�/+q1 4781 <br /> 4777 <br /> Yt 0 ft 1000 ft 2000 ft 3000 ft <br /> Figure 4.Groundwater wells located in the vicinity of the Nix Site <br /> 4. CONCLUSIONS <br /> As supported by the lack of downgradient groundwater, installation of slurry walls around <br /> the majority of the mine cells,operational BMPs, and the fact that DRMS has not <br /> consistently required groundwater monitoring programs for other mine operators in the <br /> area,we do not believe that there is a "reasonable potential" for the Nix Site to adversely <br /> affect the groundwater quality.As such,we believe that the monitoring program,as <br /> proposed in RMCC's TR2 submittal provides adequate protection to prevent the <br /> degradation of groundwater quality from operations at the Nix Site and that specific <br /> numeric protection limits are not required given the existing practice-based permit <br /> conditions. <br /> DINATALE WATER CONSULTANTS 7 <br />