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Groundwater Monitoring Plan <br /> monitoring well instillation diagram in Figure 2. Water level measurements collected in <br /> concert with water quality sampling will serve as quarterly water level measurements for <br /> the purposes of this monitoring evaluation plan. <br /> 2.3 Water Quality Monitoring <br /> L.G. Everest commits to obtain the water quality samples on a quarterly basis for five <br /> quarters prior to exposing water during mining. The water quality data will be used as a <br /> baseline, while subsequent water quality data, (obtained periodically) will be compared <br /> to the baseline data to assess water quality variations. Parameters with significant non- <br /> detects or are determined to be unrelated to mining and/or mining activities will be <br /> proposed for removal on a case-by-case variance. Sampling frequency after the five <br /> quarters of baseline data will be periodic and is assumed to be annually. The method <br /> proposed for the water quality assessments is discussed in the following section. <br /> Water quality monitoring wells and point of compliance wells will have water quality <br /> samples collected quarterly for the first five quarters and then on a regular basis (at <br /> least annually) using the Groundwater Sampling Plan. Table 3 lists all the parameters <br /> found in the DRMS June 9, 2023 Groundwater Monitoring Sampling and Analysis Plan <br /> Guidance —Appendix A with an asterisk on certain parameters. Several of the <br /> parameters are not relevant to the mining operations and it is requested that they be <br /> omitted. The Rationale for omitting the asterisked parameters is found in Table 4. <br /> Parameters for the initial five quarters of baseline sampling will be those on Table 3 that <br /> did not get approval for omission by DRMS. <br /> Collected samples will be preserved as recommended by the analytical laboratory and <br /> will be recorded on field data sheets and the laboratory chain of custody. Once baseline <br /> water quality data is obtained, a proposal will be submitted to reduce the number of <br /> wells and parameters to be quality monitored in the form of a DRMS Technical Revision <br /> (TR). Point of compliance wells will be utilized for the collection of water quality data for <br /> the life of the mine or until monitoring is released by DRMS. Monitoring wells in <br /> upgradient and downgradient positions from the specific phase of mining will be used to <br /> assess whether water quality degradation could be occurring. <br /> The first five quarters of samples collected from the water quality monitoring (WQM) and <br /> point of compliance (POC) wells will be analyzed for the parameters in Table 3, a list <br /> including parameters from the CDPHE Regulation 41 — Basic Standards for <br /> Groundwater. Groundwater samples collected after the first five quarters will be <br /> analyzed for a new list of parameters approved by DRMS in a TR. Parameters detected <br /> above the Table Value Standard on the Sampling Parameter List (Table 3), as revised <br /> or amended in the future, will be highlighted. <br /> F MOLEN LG Everist Monitoring Plan <br /> Page 4 of 5 <br />