Laserfiche WebLink
The following wells have been identified as the POC wells: Nix-Owens-Mon 5A, Nix- <br /> RMCC-Mon 6 and Nix-RMCC-Mon 9. Note: Nix-RMCC-Mon 9, in the northwest corner <br /> of the site, was installed in April 2023 at DRMS's request to provide data in the most <br /> downgradient point in that area of the permit. <br /> Wells Nix-Owens-Mon 2 and Nix-RMCC-Mon 6, located upstream and downstream, <br /> respectively, of the southwest mining envelope (including Cell 1, Cell 6, the proposed <br /> plant, siltation pond, and freshwater pond) will allow characterization of groundwater <br /> impacts of operations to the groundwater quality. Wells Nix-Owens-Mon 4A and Nix- <br /> Owens Mon 5A, located upstream and downstream of the southern mining envelop will <br /> allow determination of groundwater impacts from Cells 4 and 5. Similarly, wells Nix- <br /> RMCC-Mon 7 and Nix-RMCC-Mon 5A, located upstream and downstream of the <br /> northwestern mining envelope will allow determination of groundwater impacts across <br /> Cell 2 and Cell 3. Nix-RMCC-Mon 9 will be compared against Nix-RMCC-Mon 8 to <br /> evaluate influence across the northern perimeter of the site. Because Nix will use slurry <br /> walls, any water quality effects on groundwater are expected to be negligible. <br /> 3.2.2 Monitoring Frequency <br /> The Plan has two phases: Baseline and Operational. Baseline Phase consists of sample <br /> collection that has already occurred prior to, or will occur subsequent to and in conjunction <br /> with, mining activity on the site; that is, after consultation with and approval by DRMS, the <br /> Operator will continue to develop its baseline dataset at the same time it commences <br /> mining operations. Operational Phase will occur on an ongoing basis once the baseline <br /> data is acquired;and will continue until mining ceases. <br /> 3.2.2.1 Baseline Phase (Prior to Mining Activity) <br /> RMCC has initiated its pre-operational water quality sampling program. Groundwater <br /> levels have been measured monthly since August of 2019 or before. Initial baseline water <br /> quality samples were collected in June 2021 at the following locations: Nix-Owens-Mon <br /> 4A, Nix-Owens-Mon 5A, Nix-RMCC-Mon 6, Nix-RMCC-Mon 7, and Nix-RMCC-Mon 8. <br /> RMCC Environmental Manager Scott Legg has discussed the 2021 results with DRMS <br /> Environmental Protection Specialist Eric Scott. RMCC sampled four wells again in April <br /> 2023. Though results are pending, the testing will confirm any exceedances and will <br /> provide results for analytes missed in 2021. Further, RMCC will continue monitoring for <br /> quality until it has five quarters worth of data,then proceed in the future with annual testing <br /> every June. <br /> The first round of subsequent samples was collected on April 17, 2023. Sample <br /> collections were attempted at the following dry wells: Nix-Owens-Mon 1, Nix-Owens-Mon <br /> 2, and Nix-Owens Mon 4. Nix-Varra-Mon 3 is a 1" well and is deemed not suitable for <br /> water quality sampling. Nix-RMCC-Mon 9, was installed on April 12, 2023, and will be <br /> included in future sampling events. Additional subsequent sampling events at all seven <br /> 11 <br />