2018-05-11_REVISION - M1977493 (2)

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Water Quality Monitoring Plan Climax Molybdenum Company Version R4 Permit No. M-1977-493 ■ Spring and seep sampling in the area above Eagle Park Reservoir as identified on Figure 3 (EVS-1, EVS-2, and EVS-3); • The Eagle Park Reservoir Outlet, during discharge periods; ■ Two locations on the East Fork Eagle River (AI and BI), as described in Section 3.2.6 (Figure 3); ■ A surface water sampling site in Clinton Creek (CC-SW1), above Clinton Reservoir (Figure 5); and ■ A surface water sampling site in the East Interceptor ditch (EI-SW1), above Clinton Reservoir(Figure 5). Climax understands that the reservoir companies may also collect data, independent of Climax, from locations associated with the reservoirs and outside of the Climax Mine property boundaries and, in collaboration with Climax, may collect duplicate samples at Climax locations in coordination with Climax sampling events for those parameters included in this WQMP. It is anticipated that the reservoir companies will share any data they collect with Climax for incorporation into the data analysis, where appropriate. 6.2 Monitoring Parameters Analytical parameters to be monitored at the monitoring sites listed above will be the same as those identified in Section 4.1 for all other monitoring sites. 6.3 Data Analysis As indicator parameter data from each sampling event are collected and quality assurance/quality control (QA/QC) completed, in accordance with the procedures outlined in Section 7, Climax will calculate the mean and standard deviation for each parameter at each sampling location. These statistical parameters will be used in subsequent statistical evaluations of the data, as needed. Climax will review the monitoring results to determine whether the most recent sampling results are consistent with the data over the period of record, or if the results might be considered to contain one or more outliers. If Climax determines that the most recent sampling results may not be consistent, they may elect to collect an additional sample for inclusion in the dataset to be used for trend analyses. If a statistically significant trend indicating declining water-quality is observed, Climax will promptly notify the DRMS and the relevant reservoir company. The following sections detail the procedures that will be followed to evaluate the data. 6.3.1 Eagle Park Reservoir POC Well NPL Evaluation For the POC well above Eagle Park Reservoir(EV-MW-004), the NPL data evaluation procedures identified in Section 5.2.1 will be followed. When notification and/or consultation are required pursuant to these procedures relative to the monitoring results at EV-MW-004, the Eagle Park Reservoir Company will be notified and consulted, in addition to the DRMS. Written notification will be submitted to the following address: Eagle Park Reservoir Company c/o General Manager Eagle River Water and Sanitation District 846 Forest Road Vail, CO 81657 EPP—Appendix C May 2018 30