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Chavers Mining Resource <br /> Groundwater Monitoring and Mitigation Plan <br /> January 2024 <br /> Page 4 <br /> quarters of baseline groundwater sampling will be used as the site-specific groundwater quality <br /> standard. Results for all other analytes were below their respective WQCC Regulation 41 INS <br /> Tables 1 —4 standards. <br /> 3.0 GROUNDWATER MONITORING AND MITIGATION PLAN <br /> The following activities will be conducted by ASCI to monitor groundwater quantity and quality <br /> throughout the operational life of the mine until reclamation is complete. <br /> 3.1 GROUNDWATER QUANTITY <br /> 3.1.1 Groundwater Measurement Schedule <br /> ASCI will collect monthly groundwater elevation readings from monitoring wells MW-2 through <br /> MW-6. ASCI will compare monthly groundwater levels against the baseline groundwater level <br /> data for each well within one (1) week of collection to determine if any impact to the hydrologic <br /> balance have occurred. Groundwater measurements will continue for a minimum of 12 additional <br /> months (i.e., January 2024 to December 2024). Any change to the groundwater level monitoring <br /> schedule (i.e., reduction in measurement frequency) will be submitted to DRMS via Technical <br /> Revision for approval prior to implementing. <br /> 3.1.2 Groundwater Quantity Data Evaluation and Trigger Levels <br /> Groundwater elevations naturally fluctuate throughout the year based on the season but can also <br /> be influenced by a variety of unusual conditions at any one time (e.g., persistent rain or drought). <br /> The primary trigger for evaluating if potentially adverse impacts to the hydrologic balance have <br /> occurred will be if the groundwater level in any well either increases two(2)feet above the baseline <br /> high measurement or drops two (2) feet below the baseline low measurement. The trigger <br /> measurements for each well are provided in the following table. <br /> Baseline GW Trigger Elevation Baseline GW Trigger Elevation <br /> Well ID Elevation—8igh High Evaluating Elevation—Low for Evaluating Low <br /> {ft amsl) � �GW Impacts i8 amsl GW impacts <br /> (ft amsl) ) (B amsl) <br /> MW-2 4909.62 4911.62 4905.13 4903.13 <br /> MW-3 4904.64 4906.64 4899.07 4897.07 <br /> MW-4 4907.23 4909.23 4902.72 4900.72 <br /> MW-5 4912.89 4914.89 4909.09 4907.09 <br /> MW-6 4909.11 4911.11 4904.82 4902.82 <br /> Notes: <br /> ft amsl=feet above mean sea level <br /> 3.1.3 Evaluating Impacts to the Hydrologic Balance and Mitigation Measures <br /> Should groundwater elevations exceed two (2) feet above the baseline high measurement or drop <br /> two (2) below the baseline low measurement in any monitoring well, ASCI will contact DRMS <br />