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Water Quality Monitoring Plan Climax Molybdenum Company <br /> Version R4 Permit No M-1977-493 <br /> Arkansas River Watershed <br /> Statistic ARK-MW-002S ARK-MW-002D ARwell ARK-MW-001D <br /> NumberofSam les 19 19 21 32 <br /> Number of Non-Detects 0 0 0 0 <br /> Mabmum m /L 03 78 06 2 <br /> Mean m /L) 01 67 039 1 8 <br /> Eagle River Watershed <br /> Statistic EVMW EVMWAS EVMW-1D EVMW-2 EVMW-3S EVMW-3D EVMW-004 <br /> Number of Sam pies 2 36 36 22 22 22 27 <br /> Number of Non-Detects 0 0 1 13 13 0 0 <br /> Mapmum m /L 0.3 04 0.3 02 0.1 0.4 03 <br /> Mean(mg/L) 03 02 02 01 009 03 016 <br /> Tenmile Creek Watershed <br /> Statistic GW#1 TM MW-001 D GW#2 TM MW-002D <br /> Number ofSamples 25 19 25 20 <br /> Number of Non-Detects 0 0 12 0 <br /> Mawmum m /L 1.5 34 046 0.6 <br /> Mean m /L 1 1 32 Oil 0.4 <br /> Fluoride is ubiquitous in the region as a result of the mineralization associated with intrusive formations <br /> found at Climax and in adjacent areas. Primarily based on the relatively low concentrations of fluoride <br /> observed in the shallow alluvial wells throughout each watershed, fluoride is not considered a relevant <br /> indicator parameter for mining-related sources. Observed fluoride concentrations in deeper bedrock wells <br /> in the Arkansas River and Tenmile Creek watersheds are believed to be related to fluorite mineralization <br /> within rock formations including quartz monzonite or migmatite. <br /> Based on the evaluation of baseline monitoring data, Table 4-2, below, presents the indicator parameter <br /> list for groundwater monitoring at Climax. <br /> Table 4-2-Indicator Parameters for Groundwater Monitoring <br /> Indicator Parameters <br /> Cadmium,dissolved Zinc,dissolved <br /> Copper,dissolved pH <br /> Iron,dissolved Sulfate(SO4) <br /> Manganese,dissolved Total Dissolved Solids(TDS) <br /> Molybdenum,dissolved <br /> 4.1.2 Internal Surface Water Monitoring Sites <br /> Analytical data collected from the internal surface water monitoring locations CC-SW1 and EI-SW1 during <br /> the extended baseline monitoring period are in Appendix B-4. For the internal surface water monitoring <br /> sites identified in this WQMP, the TR-18 analytical list was developed following the same approach as <br /> groundwater sites. The TR-18 analytical parameter list for internal surface water samples is in Table 4-3 <br /> and differs from the groundwater list with the addition of hardness, ammonia (NH3), and total mercury in <br /> lieu of dissolved. <br /> As indicated in Table 4-3, and as described in TR-18, dissolved iron, manganese, and molybdenum, pH, <br /> Sulfate, and Total Dissolved Solids were identified as appropriate indicator parameters for internal surface <br /> water monitoring, following the baseline data collection period. <br /> EPP—Appendix C March 2018 16 <br />