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Technical Revision (TR-28) Climax Molybdenum Company <br /> Environmental Protection Plan Permit No. M-1977-493 <br /> River include an installed backup pump and a diesel generator for use in the event of an extended loss of <br /> power. Instrumentation and telemetry equipment is in place to trigger an alarm at the mill facilities in the <br /> event of a high water level in the collection pond. <br /> Robinson Lake Pump System: The location of the Robinson Lake Pump Station is just below Robinson <br /> Dam. A former pump station facility in this location has been decommissioned. The new Robinson Lake <br /> Pump Station and reclaim water pipeline are part of the process water reclaim system allowing for the <br /> recycling and re-use of water from the TSFs. Water is pumped to the mill water storage tank through a <br /> 21,000 foot buried steel pipeline for use as process water in the milling circuit. As described above, <br /> recharge to Robinson Lake will be accomplished by transferring water from Tenmile TSF and Mayflower <br /> TSF via the Tenmile Tunnel. The new pump station has a nominal operating capacity of 10,000 gpm. <br /> The Robinson Lake Pump Station and pipeline design was submitted to, and approved by, DRMS in 2008 <br /> under TR-14 and later in 2011 under TR-17 due to a change in pipeline size and alignment. <br /> The design of the Robinson Lake reclaim water pump system is based on using the existing outlet pipe <br /> from Robinson Lake. A new hydraulically actuated outlet works valve was installed in 2008 along with <br /> new piping at the downstream toe of the embankment. In 2011, as part of construction of the new <br /> Robinson Lake Pump Station, new piping connects the outlet works piping into the pump station. <br /> The Robinson Lake Pump Station building is a pre-engineered metal building. No potable water or <br /> sanitary sewer systems are included in the building. The building is configured so that all spills and leaks <br /> inside the building are captured by a sump and pumped to Robinson Lake by a dedicated sump pump. <br /> The pump station and pipeline are designed to preclude accidental discharge to Eagle Park Reservoir <br /> and East Fork Eagle River. If a leak were to occur in the pipeline, water would either flow into one of the <br /> surface containments on site such as Robinson Lake or Robinson TSF or the Robinson Dam seepwater <br /> collection ponds. As with other EPFs, Climax conducts daily visual inspections of all active pipelines <br /> during each shift, including the entire reclaim system. These frequent visual inspections provide for <br /> immediate detection and response should a leak occur and are a key component to a comprehensive <br /> monitoring/mitigation system to prevent potential environmental impacts. Additional information regarding <br /> system alarms at the Robinson Lake Pump Station is in Section T-5.4.2. <br /> Chalk Mountain Interceptor. An extensive clean water interceptor system has been established by <br /> Climax around the affected areas of the Eagle River Watershed. The Chalk Mountain Interceptor <br /> conveys storm water around the process facility and TSFs, which limits the amount of impacted waters to <br /> be treated and discharged. As agreed upon with DRMS, although this interceptor is considered to be a <br /> pre-EPF system and does not contain or control designated chemicals or process solutions, it will be <br /> managed as an internal EPF. The interceptor is closely monitored, inspected and maintained as part of <br /> routine site monitoring activities. Other than normal repair and maintenance/upgrades, any future <br /> expansion or modifications of the interceptors will be subject to review by DRMS, consistent with Section <br /> 6.4.21(10)(a)(ii) of the Rules. <br /> This Chalk Mountain Interceptor starts near the top of Fremont Pass and collects runoff primarily from the <br /> north slope of Chalk Mountain. The system discharges the collected water either into Eagle Park <br /> Reservoir or into the East Fork Eagle River. Except for a few culvert sections, the interceptor consists of <br /> an unlined ditch that is cut into the hillside. The ditch is paralleled by an access and maintenance road. <br /> T-5.3 Tenmiie Creek Watershed <br /> T-5.3.1 Potential Sources of Contamination <br /> The open pit mine, mill facilities, overburden storage facilities (OSFs), and the Robinson, Tenmile and <br /> Mayflower TSFs are all located within the Tenmile Creek Watershed (Figure AM-06-T-01). Most of <br /> Climax's water treatment/management activity occurs within the Tenmile Creek drainage area and must <br /> address: (1) a component of water that is pumped from the Eagle and Arkansas River drainages to the <br /> Tenmile drainage; (2) a large component of minimally impacted runoff from areas above the interceptor <br /> channels within the Tenmile drainage; and (3) wastewater from the mill circuit and water which has had <br /> direct contact with mine tailing, overburden, or other disturbed areas. <br /> EPP: Version R4 T-24 August 2018 <br />