2022-04-05_REVISION - M1977342 - Laserfiche WebLink

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Climax Molybdenum Company Permit No.1977-342 Technical Revision JR-35) stations.The potable water system will consist of a small reverse osmosis potable water treatment system capable of treating approximately 2.8 gallons per minute on average and will be equipped with a 1,000-gallon storage tank. Utility water, which consists of treated water from the WTP effluent tank, will be used for a variety of purposes including push water for the polymer system, carrier water for the CO2 system, dilution/flush water for the sludge system, and utility hose stations (cleaning). Sanitary water will be directed to a septic tank and leach field. A leach field location to the north of the WTP is identified on drawing 530-DD10-PLN-602, included in Appendix A, however this location is subject to change based on additional site investigation activities during construction but not anticipated to be significantly modified as preliminary geotechnical investigations of the area have been used to inform the current design. Laboratory wastewater streams will be returned to the head of the process and will not be discharged to the septic system. Lab tests associated with wastewater treatment plants are for process control and are generally taken at each location where a change in the process occurs. Tests associated with process control are expected to include, but are not limited to, pH, oxidation reduction potential, total suspended solids, sludge density, temperature and soluble manganese. 2.4.3 Power and Utilities Electricity for the WTP will be provided utilizing a tie-in to the electrical supply at the existing mill switchgear via medium voltage (MV) 15 kV Class power cables routed in an underground electrical duct to a new MV unit substation near the WTP. A site-rated, diesel-driven, arctic-duty, enclosed generator will be provided to supply critical emergency power to the plant during periods of power loss. Diesel fuel storage for this generator will be contained within a double-walled sub-base tank. Critical process equipment and building lighting, heating, ventilation, and communications systems can be maintained during a power loss. Natural gas, for heating purposes, will be provided to the WTP site by tying into the existing 1" gas line supplying the mill building to the east of the WTP. 2.4.4 Roads and Access The WTP will be located northeast of the mill along an existing access road. The main access to the plant will be provided from the existing entrance off the North Mill Access Road to the disturbed area where the WTP will be constructed. The gravel parking area around the WTP will be improved by overlaying with asphalt. A security gate will be installed between the North Mill Access Road and the WTP to control access. 2.4.5 Point of Discharge The WTP treated effluent will gravity flow through the existing Williams Fork Pipeline and discharge to the WFR at an existing outlet structure. The Williams Fork Pump Station was originally constructed and still utilized to withdraw water from the WFR and pump water to the mill for use. The infrastructure at the pump station includes an inlet structure on the WFR upstream of the pump station and an outlet headwall downstream of the station. Water enters the pump station through a buried box culvert from the inlet structure and this box culvert passes through the pump station and continues to an existing headwall discharge structure on the river to serve as a bypass system. The pump station system will be modified to allow treated effluent from the WTP to be conveyed through the existing pipeline to the existing Williams Fork Pump Station and to pass through the structure and discharge to the river through the existing bypass box culvert outlet. 2.5 Project Schedule Engineering and design of the WTP is substantially complete and is considered "Issue for Construction". As mentioned above, Henderson expects to have permitting for the project completed in late 2022 or early 2023 with construction beginning after receipt of final permits (2023-2024). The WTP is expected to begin operations in 2024 or 2025. April 2022