2023-05-02_REVISION - M2001046 - Laserfiche WebLink

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3.4 Water Quality Mitigation Plan If limits are exceeded, the Operator will implement the following mitigation procedures: • Notify DRMS of the exceedance within seven days of either receiving the analytical report from the laboratory or completing the described regression analysis. • Identify the potential causes/sources of the exceedance parameters. • Implement supplemental water quality sampling. If exceedances are detected, the Operator will collect samples to confirm the exceedance as soon as practicable, but no longer than 14 days after receiving the exceedance. If confirmed, the Operator will work with DRMS to establish an appropriate supplemental sampling schedule. Only parameter(s) which exceed the regulatory limits will be analyzed and will continue to be monitored until the parameter(s) drop below the allowable limit. The Operator will begin implementing one or more mitigation measures if mining and reclamation activity is determined to be a significant factor to groundwater changes requiring mitigation. Mitigation measures may include, but are not limited to: • Review chemical inventory for elevated analytes and develop plans for chemical containment, abatement, reduction and/or substitution. Confirm effectiveness of appropriate controls surrounding chemical spill. • Review effectiveness of slurry walls and source area containment. • Collect additional samples of stockpiled materials and review placement and containment of stockpiles if identified analytes are detected in elevated rates. • Remove suspected contaminated materials and replace with clean fill or another suitable material. 3.5 Annual Report A water quality summary report will be prepared annually and submitted with the Operator's annual DRMS report. The report will present summaries of the data collected during the previous year and compare such data to State water quality standards and the baseline monitoring results. 14