2018-05-11_REVISION - M1977493 (2)

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Water Quality Monitoring Plan Climax Molybdenum Company Version R4 Permit No. M-1977-493 Based on the evaluation of baseline monitoring data, the indicator parameter list for routine surface water monitoring, as well as the expanded baseline parameter list for periodic monitoring and reporting is in Table 4-5. Table 4-5-Surface Water Monitoring Parameters Indicator Parameters Cadmium,dissolved Molybdenum,total recoverable Copper,dissolved Zinc,dissolved Iron,dissolved pH Iron,total recoverable Sulfate(SO4) Manganese,dissolved Total Dissolved Solids(TDS) Molybdenum,dissolved Hardness Expanded Baseline Monitoring Parameters Aluminum,dissolved Selenium,dissolved Antimony,dissolved Silver,dissolved Arsenic,dissolved Sodium,dissolved Arsenic,total recoverable Thallium,dissolved Barium,dissolved Vanadium,dissolved Beryllium,dissolved Ammonia(NH3)as N Calcium,dissolved Bicarbonate(HCO3) Chromium(Crlll+CrVI),dissolved Total Alkalinity Cobalt,dissolved Chloride,dissolved Lead,dissolved Cyanide,WAD Magnesium,dissolved Cyanide,total Mercury,total Fluoride,dissolved Nickel,dissolved Total Nitrate+Nitrite as N Potassium,dissolved Total Organic Carbon(TOC) 4.2 Monitoring Schedule Following the approval of this TR-27, all groundwater and internal surface water monitoring locations under this WQMP will continue to be monitored quarterly for the indicator parameters listed in Tables 4-2, and 4- 5, respectively. Ongoing surface water monitoring of the East Fork Arkansas River and the East Fork Eagle River will be performed semi-annually, to collect data during high-flow and low-flow conditions. Concurrent monitoring will be conducted when possible at sampling stations on the East Fork Eagle River and the Eagle Park Reservoir outlet during periods of discharge from the reservoir. The Eagle Park Reservoir outlet generally releases water during winter months, November through March, but may also release water in late summer or fall. Climax will conduct concurrent sampling on the East Fork Eagle River and at the EPR Outlet at least once each year during the river low flow winter period. When possible, Climax will again concurrently sample these sites in the late summer or early fall if water is released from the reservoir. All routine monitoring will be performed on these schedules, weather and access conditions permitting. Once every three years, samples from all monitoring locations will also be analyzed for the expanded baseline monitoring parameters set forth in Tables 4-2 (groundwater) and 4-5 (surface water). EPP—Appendix C May 2018 21