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Technical Revision (TR-28) Climax Molybdenum Company <br /> Environmental Protection Plan Permit No. M-1977-493 <br /> During Phase II Deposition, first stage treatment of impacted water takes place in both the SDP and <br /> Mayflower TSF water pool since the discharge of circumneutral tailing slurry into the Mayflower water pool <br /> is consistent with first stage treatment. Excess water requiring off site discharge from the Mayflower TSF <br /> is pumped from the water pool by a second barge (described in TR-19) and delivered to the PDWTP. <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 /> ■ 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 (TDL and ETDL); <br /> ■ Water treatment chemicals (stored and used) for treatment of mine water (including the Lime <br /> Station, SDP and PDWTP); <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. <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 and the <br /> PDWTP, contains the principal EPFs in the Tenmile Creek Drainage. This system discharges treated <br /> water meeting the conditions and standards of the CDPS Permit at Outfall 001A located near the property <br /> boundary. Under the CDPS permit discussed in Section T-2.2, discharge of water from the site, including <br /> process water and impacted waters are required to meet discharge water quality limits. Contaminants that <br /> might be released from the potential sources discussed in Section T-5.3.1 would be captured within the <br /> Tenmile Creek watershed above or at the Mayflower TSF where water is sent to stage 2 treatment at the <br /> PDWTP prior to discharge. Individual EPFs, which are part of the water treatment system, are discussed <br /> in subsequent sections along with EPFs that are present in other areas of potential contamination above <br /> 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 /> ■ TDL; <br /> ■ ETDL; <br /> ■ East Side Channel; <br /> ■ Robinson TSF and 2 Dam; <br /> ■ Tenmile TSF and 3 Dam; <br /> ■ Mayflower TSF and 5 Dam; <br /> EPP: Version R4 T-26 August 2018 <br />