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Water Quality Monitoring Plan Climax Molybdenum Company <br /> Version R4 Permit No M-1977-493 <br /> location above Eagle Park Reservoir, respectively. A compilation of water quality monitoring data which <br /> have been submitted in Annual Reports to DRMS are included in Appendix B-2. <br /> 3.2.5.2 Internal Groundwater Monitoring Sites <br /> Climax also monitors several internal sites located downgradient of mine facilities and above Eagle Park <br /> Reservoir(Figure 3). In addition to the protection afforded to Eagle Park Reservoir by the Environmental <br /> Protection Facilities (EPFs)described in the EPP, these internal water monitoring sites enable detection of <br /> potential changes in water quality upgradient of the reservoir so that appropriate actions can be taken. <br /> Groundwater quality within the upper Eagle River Valley has historically been monitored quarterly at the <br /> EVMW monitoring well (Figure 3) which was constructed in September, 1993. EVMW is located above <br /> Eagle Park Reservoir, approximately 200 feet downstream from the Robinson Lake Seepage Collection <br /> system. In 2011, Climax constructed a shallow (alluvial) and deep (bedrock) well pair approximately 20 <br /> feet upgradient of EVMW. The new wells EVMW-1S (alluvial) and EVMW-1D (bedrock) are shown on <br /> Figure 3 and the well logs are included in Appendix A. The new well pair adds a bedrock well at that <br /> location and replaces shallow well EVMW that is plugged with silt. Groundwater analytical data from EVMW <br /> are available from quarterly sampling events starting in the fourth quarter of 1993 up until late 2011, when <br /> monitoring at EVMW was discontinued. Climax has been monitoring groundwater from wells EVMW-1S <br /> and EVMW-1 D since they were constructed. <br /> As described in Section 6.1, Climax investigated the geology and groundwater conditions in the area <br /> between the north abutment of 1 Dam and Eagle Park Reservoir. As a result, one groundwater monitoring <br /> well(EVMW-2)and three spring/surface sites(EVS-1, EVS-2 and EVS-3)were established at the locations <br /> indicated on Figure 3. Well EVMW-2 is a bedrock well (no saturated alluvium encountered) and was <br /> constructed to monitor groundwater quality between the north abutment of 1 Dam and Eagle Park <br /> Reservoir. The EVS sites were established to monitor shallow groundwater directly above Eagle Park <br /> Reservoir. <br /> Well logs and completion diagrams for these wells are in Appendix A. Monitoring parameters and schedule <br /> are in Section 4, and data evaluation procedures and follow-up actions to be taken by Climax specifically <br /> related to monitoring sites above Eagle Park and Clinton Reservoirs are described in Section 6 of this <br /> WQMP. Water quality monitoring data which have been submitted in Annual Reports to DRMS are included <br /> in Appendix B-2. <br /> 3.2.6 Surface Water Monitoring Sites <br /> Climax established surface water monitoring sites at two locations in the East Fork Eagle River, upstream <br /> (AI) and downstream (BI) of the confluence of the outfall from Eagle Park Reservoir. In addition, in <br /> cooperation with the Eagle Park Reservoir Company, Climax has agreed to monitor the quality of water <br /> released from the Eagle Park Reservoir (EPR) at the reservoir discharge (EPR Outlet). This is an <br /> established monitoring location at the end of the outlet pipe at the base of 4 Dam before water passes <br /> through the flume and enters the drainage leading to the East Fort Eagle River. Monitoring parameters <br /> and schedule are in Section 4 and water quality monitoring data which have been submitted in Annual <br /> Reports to DRMS are included in Appendix B-5. <br /> EPP—Appendix C March 2018 8 <br />