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Technical Revision (TR-28) Climax Molybdenum Company <br /> Environmental Protection Plan Permit No. M-1977-493 <br /> the on/off operation of the pumps. A backup generator, which is located in the Robinson Lake Pump <br /> Station, provides backup power to the seepwater system in the event of a power failure. This system is <br /> monitored regularly by Climax personnel. <br /> 4 Dam Seepage Collection and Pump Station: This seepage return station is checked regularly by mine <br /> personnel. Water level readings from a level probe control the on/off operation of the pumps. In addition, <br /> a beacon alarm is situated atop the dam to alert personnel in the case of pump failure. A back-up pump <br /> is situated at the station as well as a back-up generator set to run the seep pump in case of power failure. <br /> The channel immediately below the 4 Dam seepage collection system primarily conveys only water <br /> released from the Eagle Park Reservoir (EPR) and localized run-off from precipitation or snowmelt <br /> events. As part of its EPF monitoring program, Climax will visually inspect the stream channel below the <br /> seepage collection system and EPR outlet works during periods of no natural flow or discharge from the <br /> reservoir. <br /> Robinson Lake Pump System: The pump station is designed for normal operation with two pumps <br /> running. A third pump is installed as a backup during normal operating conditions and could be used to <br /> evacuate additional water from Robinson Lake if needed. Pressure indicators on the intake and <br /> discharge sides of the pumps control operation of the pumps and also are tied to automated alarms to <br /> warn of upset conditions. As with the other pump stations at Climax, the pump station pressure alarms <br /> are connected telemetrically to the mill control room to provide immediate notification should intake or <br /> discharge pressures exceed certain set points or pump upsets occur. <br /> The pump station is also equipped with instrumentation to monitor pump operating status, temperature, <br /> and vibration as well as discharge flow rate. These parameters will be relayed to and monitored at the <br /> mill control room. <br /> T-5.5.3 Tenmile Creek Watershed <br /> Monitoring of the water treatment and discharge system, which verifies the effectiveness of the various <br /> EPFs associated with the water treatment system at Climax, is extensive and intensive. The CDPS <br /> Permit requires daily, monthly, and quarterly sampling and monitoring with reporting on a monthly basis. <br /> In addition, Climax conducts quarterly WET tests on discharged waters. Detailed information regarding <br /> the types of monitoring, parameters, frequency, reporting requirements, methods and analyses are found <br /> in the CDPS Permit (CO0000248). <br /> Water Treatment Chemicals. The chemicals used in the water treatment process are flocculent, lime and <br /> sulfuric acid. Lime and sulfuric acid are stored in steel silos and a 4,300 gallon tank, respectively. The <br /> acid station at 5 Dam is being phased out since commissioning of the PDWTP. As described previously, <br /> flocculent is stored in mix tanks and feed/storage tanks. The mixing in the mix tanks is done in batch <br /> operations and is monitored. The feed/storage tanks are equipped with level controls to regulate tank <br /> levels. The lime silos are monitored visually. The PDWTP sulfuric acid tank is monitored with level <br /> indicators. The acid metering system also contains an alarm. <br /> Designated Chemicals for Concentrate Production: Monitoring of the integrity of the designated chemical <br /> EPFs is a standard operating procedure at the Climax Mine during periods of operation when chemicals <br /> are maintained at the site. Each storage facility is visually checked by mill personnel. Leaks, spills, or <br /> other accidental or unauthorized releases are immediately reported. <br /> TDL and ETDL: Regular checks of the TDL and the ETDL are conducted. While the TDL is used to <br /> transport tailing from the mill to the TSFs, they are also important links in the water treatment system at <br /> Climax. Specific monitoring procedures and a description of instrumentation installed within the tailing <br /> delivery system are described in the TSF Operations and Maintenance Manuals submitted as TR-20 and <br /> TR-23. These manuals, incorporated by reference, will be maintained and updated separate from the <br /> EPP. <br /> Robinson TSF and 2 Dam: Monitoring of 1 Dam was discussed in Section T-5.5.2. Robinson TSF and 2 <br /> Dam are monitored visually by Climax personnel. As with all the TSFs, its location, size, and function <br /> allow for extensive observations. <br /> EPP: Version R4 T-34 August 2018 <br />