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• <br />• <br />• <br />Technical Revision (TR -18) Climax Molybdenum Company <br />Environmental Protection Plan Permit No. M- 1977 -493 <br />system is monitored regularly by Climax personnel; however, this system also collects some surface <br />runoff and shallow subsurface flows from the area to the left of the dam embankment. <br />Six structural monuments are located along the crest of the dam for monitoring for ground movement. <br />These monuments are surveyed once per year, or more frequently if requested by the SEO, to monitor for <br />indications of settlement, sliding, or dam instability. <br />Warren's Pump System: Warren's Pump Station is checked regularly by mine personnel and contains <br />appropriate alarms to provide immediate notification should pump failure occur. <br />Robinson Lake Seepage Pump Station: Water level readings from a level probe in the wet well control <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 />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 will control operation of the pumps and will also be tied to automated <br />alarms to warn of upset conditions. As with the other pump stations at Climax, the pump station pressure <br />alarms will be connected telemetrically to the mill control room to provide immediate notification should <br />intake or 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, weekly, monthly, and quarterly sampling and monitoring with reporting on a monthly <br />basis. In addition, Climax conducts quarterly WET tests on discharged waters. Detailed information <br />regarding the types of monitoring, parameters, frequency, reporting requirements, methods and analyses <br />is found in the CDPS Permit. <br />Water Treatment Chemicals: The chemicals used in the water treatment process, are GreatFloc 5500, <br />lime and sulfuric acid. Lime and sulfuric acid are stored in steel silos and a 7,000 gallon tank, <br />respectively. As described previously, GreatFloc 5500 is stored in one 2,500 gallon mix tank and one <br />3,000 gallon feed /storage tank. The mixing in the mix tank is done in batch operations and is monitored. <br />The feed /storage tank is equipped with level controls to regulate tank levels. The lime silos located at the <br />Lime Station are monitored visually. The sulfuric acid tank is monitored with telemetric level indicators. <br />The acid metering system also contains a telemetric 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 new TDL and the ETDL during periods of operation and during <br />periods of inactivity are planned. While the TDL and a portion of the ETDL are planned to be used to <br />transport tailing from the mill to the TSFs, they are also important links in the water treatment system at <br />Climax. <br />Robinson TSF and 2 Dam: Monitoring of 1 Dam was discussed in Section T- 5.5.2. Robinson TSF and 2 <br />EPP: Revision R1 <br />T -30 July 2011 <br />