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4. Sampling Methods <br /> This section identifies the sampling methods that will be used to quantify the groundwater <br /> conditions at the North Hangs Mine. <br /> 4.1 . Sampling Location <br /> The sampling locations, including frequency and sampling type, are detailed in the table below. <br /> Table 3—Sampling Type and Frequency <br /> Baseline Sampling (5 Quarters Total) POC Sampling (Life of Mine) <br /> ID Quantity Sampling Quality Sampling Quantity Sampling Quality Sampling <br /> Frequency Frequency Frequency Frequency* <br /> GW-1 Monthly Quarterly Monthly None <br /> GW-2 Monthly Quarterly Monthly Quarterly** <br /> GW-3 Monthly Quarterly Monthly Quarterly** <br /> *Only one monitoring well will be used for POC quality testing. This will be determined based on <br /> the results of baseline water level sampling. <br /> **Quarterly sampling will take place at the POC after the first 12 months of mining. After 12 <br /> months, it may be decreased through a TR with the DRMS. <br /> 4.2. Sampling Frequency <br /> Baseline groundwater sampling will begin at least five quarters in advance of mining at the <br /> North Hangs Mine. One sample per quarter will be taken at each of the groundwater sampling <br /> locations to define the baseline conditions of groundwater (GW-1, GW-2, and GW-3). <br /> Point of compliance sampling will begin after mining has started. It will start out as quarterly <br /> sampling for the initial 12 months after the beginning of mining. If adverse impacts have not <br /> been encountered after five quarters of sampling, the frequency may be decreased with <br /> approval from the DRMS. <br /> 4.3. Sampling Parameters <br /> WSM will perform field and laboratory analysis of their samples for the water quality parameters <br /> identified in Table 4. These parameters are consistent with those required by the DRMS for <br /> Construction Material Sites, derived from Regulation 41 Tables 1-4. All laboratory analysis of <br /> the groundwater samples will be performed by a State of Colorado certified laboratory that <br /> follows industry standards and quality assurance/quality control (QA/QC) procedures. <br /> North Hangs Mine GW Monitoring <br /> Plan 8 Lewicki&Associates <br /> December 2024 <br />