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Technical Revision (TR-28) Climax Molybdenum Company <br /> Environmental Protection Plan Permit No. M-1977-493 <br /> Section T-3. <br /> T-5.5 Specific Environmental Protection Facility Monitoring/Alarms <br /> The critical EPFs at Climax are regularly checked, inspected, or monitored either visually, analytically, or <br /> both by security and water treatment personnel that are on-site at all times. Occasional inclement <br /> weather can restrict access to some facilities for short periods of time. In the case of pump stations, <br /> mechanical and telemetric alarms also are operational should failures occur. These monitoring systems <br /> are discussed herein by EPF and watershed. System alarms for the critical EPFs are discussed in <br /> subsequent sections. Facility monitoring/alarms details are not included for potential future EPFs that <br /> have not been designed. <br /> T-5.5.1 Arkansas River Watershed <br /> 5-Shaft Pump Station: The 5-Shaft Pump Station is equipped with monitoring and alarm systems. In <br /> addition to these systems, the station is visually checked regularly. A groundwater piezometer (5-Shaft <br /> Monitoring Well) has been installed adjacent to the pump station to monitor groundwater levels adjacent <br /> to 5-Shaft. The water levels in this piezometer are recorded on a monthly basis. <br /> Storke Wastewater Pump Station: The Storke Wastewater Pump Station is equipped with monitoring and <br /> alarm systems. As with the 5-Shaft Pump Station, the Storke Wastewater Pump Station is checked <br /> visually by designated employees. <br /> T-5.5.2 Eagle River Watershed <br /> Robinson TSF and 1 Dam. As discussed previously, 1 Dam has been reconfigured, stabilized, and <br /> reseeded. Monitoring of this EPF is conducted visually by various mine personnel. Piezometers are <br /> utilized to monitor water levels in the dam. <br /> Robinson Lake and Dam: Visual monitoring of Robinson Lake is performed routinely by Climax <br /> personnel. The Robinson Lake Pump Station operates as the main level control for Robinson Lake. A <br /> water level indicator continuously monitors the water level within Robinson Lake and is connected <br /> telemetrically to the mill control room to provide immediate notification should water levels exceed set <br /> points for high water action levels. <br /> Robinson Dam is considered to be a jurisdictional dam by the Dam Safety Branch of the Colorado State <br /> Engineer's Office (SEO) and must therefore meet the dam safety and inspection requirements of the <br /> SEO's "Rules and Regulations for Dam Safety and Dam Construction." The Dam is inspected regularly <br /> by Climax personnel and generally once per year by SEO personnel. <br /> A total of nine piezometers are located in the Robinson Dam embankment. Climax personnel routinely <br /> monitor the piezometers and maintain a database of phreatic water levels. <br /> A foundation drain system is located on the right downstream abutment of the dam. The flow rate from <br /> the drain is monitored regularly by Climax personnel and recorded during the SEO's Dam Safety <br /> Engineer's inspections. A small collection pond near the toe of the dam also collects dam seepage. This <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 /> EPP: Version R4 T-33 August 2018 <br />