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Stiles Mining Resource <br /> Groundwater Monitoring and Mitigation Plan <br /> December 2022 <br /> Page 3 <br /> 2023 <br /> 1st Quarter Conduct 5th Quarter Pre-Operational Background Groundwater Sampling Event <br /> (January-March) Develop Site-specific Groundwater Quality Benchmarks <br /> Submit Pre-operational Background Groundwater Monitoring Results and Site- <br /> specific Groundwater Quality Benchmarks Report to DRMS for Approval. <br /> DRMS Approval of Permit Application M-2021-067 <br /> 2nd Quarter Commencement of Mining Operations <br /> (April-June) Conduct 1 st Quarter Post-Operational Groundwater Sampling Event <br /> 3rd Quarter Conduct 2nd Quarter Post-Operational Groundwater Sampling Event <br /> (July- September) <br /> 4th Quarter Conduct 3rd Quarter Post-Operational Groundwater Sampling Event <br /> (October-December) <br /> 2024 <br /> 1 st Quarter Conduct 4th Quarter Post-Operational Groundwater Sampling Event <br /> (January-March) <br /> 3.3 GROUNDWATER SAMPLE COLLECTION PROCEDURES <br /> Prior to sampling each well, depth to groundwater and total well depth measurements will be <br /> collected using a water level indicator to the nearest 0.01 foot. Groundwater will then be purged <br /> from the well utilizing a submersible pump with dedicated tubing or hand-bailed with a dedicated <br /> bailer. All non-dedicated equipment used to collect groundwater measurements and samples will <br /> be decontaminated with a detergent (e.g., Alconox® Detergent Powder) and distilled water <br /> solution prior to use at each monitoring well.A new pair of clean,disposable nitrile gloves will be <br /> utilized for sample collection at each well.Purged water will be collected in five(5)gallon buckets <br /> where water quality parameter readings for temperature, pH, specific conductivity, and total <br /> dissolved solids(TDS)will be collected and to record the total purge volume from the well. Once <br /> groundwater stabilization is achieved (i.e., three consecutive readings within ten percent of each <br /> other for all stabilization parameters) and/or a minimum of three (3) well volumes are removed, <br /> groundwater will be collected directly into laboratory-supplied containers with the preservative <br /> appropriate for the analysis requested,as applicable.The samples will be labeled,placed in a cooler <br /> with ice (cooled to 4°C), and stored until delivery to the laboratory accompanied by chain-of- <br /> custody documentation. <br /> 3.4 LABORATORY ANALYSIS OF GROUNDWATER SAMPLES <br /> For each sampling event, groundwater samples will be collected from each of the six (6) <br /> monitoring wells (MW-1 through MW-6) and submitted for laboratory analysis. In addition, a <br /> duplicate quality assurance/quality control (QA/QC) groundwater sample will be collected from <br />