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4. WATER LEVEL MONITORING PLAN <br /> 4.1 Monthly Monitoring <br /> The Operator's water level monitoring plan submitted in June 2021 has been approved <br /> by DRMS. Consistent with that plan, the Operator will continue to monitor its groundwater <br /> level wells monthly to improve the operator's knowledge of the water table on- and off- <br /> site during operations. <br /> 4.2 Criteria and Trigger Values <br /> Certain water level deviation observed during monthly water level monitoring may initiate <br /> additional investigation. Specifically, once mining operations commence, if RMCC <br /> observes water levels in a monitoring well that are more than two feet above or below <br /> historic maximum or minimum levels observed for that well for more than two consecutive <br /> months, the Operator will take steps consistent with the Groundwater Monitoring Plan <br /> previously submitted and approved. Some of those steps include: <br /> • The Operator will evaluate the cause and will notify DRMS within seven <br /> days. <br /> • After the DRMS has been notified, the Operator will review the data and <br /> available information and submit a report to DRMS within 30 days. The <br /> evaluation will include discussions with the well owner who has <br /> contacted the operator regarding a concern, if any, and review of <br /> baseline data from the well and vicinity to evaluate whether changes <br /> may be due to seasonal variations, climate, mining, slurry wall lining or <br /> other factors. The report will identify the extent of potential or actual <br /> impacts associated with the changes. <br /> • If the extent of groundwater changes due to mining or reclamation <br /> activities is determined to be a significant contributing factor that has or <br /> may create adverse impacts, the mining-associated impacts will be <br /> addressed to the satisfaction of DRMS. <br /> • The Operator will begin implementing one or more mitigation measures <br /> if mining and reclamation activity is determined to be a significant factor <br /> to groundwater changes requiring mitigation. <br /> • Mitigation measures may include, but are not limited to: <br /> o Placing water in a recharge pond to raise groundwater levels <br /> around the well. <br /> 15 <br />