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Technical Revision (TR -18) Climax Molybdenum Company <br />Environmental Protection Plan Permit No. M- 1977 -493 <br />the water pool will be consistent with first stage treatment in the facility. Excess water in the Mayflower <br />TSF will be decanted from the water pool and delivered to the new Property Discharge Water Treatment <br />Plant (PDWTP). The new PDWTP will provide second stage treatment of the impacted waters to comply <br />with discharge permit requirements. <br />In conjunction with these operations, potential sources of contamination in the Tenmile Creek watershed <br />include: <br />• Designated chemicals (stored and used) for production of molybdenum disulfide concentrate; <br />• Dust palliatives (stored and used); <br />• Mill water reclaim circuit (including storage tanks and supply system); <br />• Process facility /mine yard (a.k.a: Camp Area) run -off and seepage; <br />• Underground mine and open pit water; <br />• OSF seepage (North 40 and McNulty); <br />• Tailing and process water delivery systems (new TDL and ETDL); <br />• Water treatment chemicals (stored and used) for treatment of mine water (including the Lime <br />Station and SDP); <br />• Robinson TSF; <br />• Tenmile TSF and 3 Dam seepage; and <br />• Mayflower TSF and 5 Dam seepage. <br />These potential sources of contamination are also listed in Table T -3 and are shown on Figure AM -06 -T- <br />01. The process water tanks near the mill facilities were demolished and removed in 2006. A new water <br />storage tank is planned as part of the new mill facility. <br />Climax has developed a comprehensive water quality monitoring plan to detect potential changes in water <br />quality downgradient of mine facilities. The monitoring is designed so that changes are detected early to <br />enable implementation of measures that may be needed to protect off site water resources such as <br />Clinton Reservoir and Tenmile Creek, including the addition of new EPFs if necessary. The water quality <br />monitoring plan is included as Appendix T -C. <br />T - 5.3.2 Environmental Protection Facilities <br />The Climax water management and treatment system, which terminates at the base of 5 Dam, contains <br />the principal EPFs in the Tenmile Creek Drainage. This system discharges treated water meeting the <br />conditions and standards of the CDPS Permit at OutfaII 001 located near the property line. Under the <br />CDPS permit discussed in Section T -2.2, discharge of water from the site, including process water and <br />impacted waters are required to meet discharge water quality limits. Contaminants that might be released <br />from the potential sources discussed in Section T -5.3.1 would be captured within the Tenmile Creek <br />watershed above or at the Mayflower TSF where water is treated prior to discharge. Individual EPFs, <br />which are part of the water treatment system, are discussed in subsequent sections along with EPFs that <br />are present in other areas of potential contamination above the water discharge outfall. <br />The following controls are designated EPFs to prevent potential impacts to Tenmile Creek and Clinton <br />Reservoir from Climax operations: <br />• New TDL; <br />• ETDL; <br />• Robinson TSF and 2 Dam; <br />• Tenmile TSF and 3 Dam; <br />• Mayflower TSF and 5 Dam; <br />EPP: Revision R1 <br />T -23 July 2011 <br />