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TR-34 to Permit M-1977-342 <br /> Environmental Protection Plan <br /> 7.1.2. Designated Chemical Storage Facilities <br /> Designated chemicals at the Henderson Mine site are limited to those located at the URAD WTP. <br /> EPFs for these chemicals include enclosed buildings, tanks and silos.The ultimate emergency EPF <br /> for these chemicals are the URAD treatment ponds, which are located downgradient of the WTP. <br /> The specific EPFs for designated chemicals at the Mill are discussed below. <br /> Mine EPF 2.1 — Quicklime Storage: Quicklime is used at the URAD WTP to precipitate metals. <br /> Lime is stored in two 100 ton silos located west of the URAD WTP building. Slaked lime is then <br /> fed to a 1,000 gallon lime slurry tank inside the WTP. <br /> Effectiveness: Quicklime is non-viscous and is easily contained and cleaned-up. Secondary <br /> containment is provided by the URAD treatment ponds and low-lying area. Any spills inside the <br /> WTP will be contained by the floors sloping toward a sump system and secondary containment. <br /> Monitoring: Chemical storage containers are routinely inspected in accordance with the SPCC <br /> by Mine personnel to assess effectiveness and integrity of each EPF system. <br /> Maintenance and/or updates to facilities, systems, equipment, or procedures are performed <br /> as needed to be protective of the environment and to prevent releases. <br /> Mine EPF 2.2—P812A Flocculent Storage: P812A flocculent is used at the URAD WTP to improve <br /> settling of sludge in the clarifier. Bags of P812A are stored on a pallet inside the WTP building. <br /> The raw, dry flocculent is added to a 500 gallon mix tank and then transferred to a second 500 <br /> gallon dosing tank inside the URAD WTP building. <br /> Effectiveness: The flocculent mixing tank and storage tank are contained within one system as <br /> an over/under tank system and sit within a secondary containment within the WTP building. <br /> The URAD WTP building provides tertiary containment and is designed with floors sloping <br /> toward a sump system and containment where it can be recycled back through the system. <br /> Monitoring: Chemical storage containers are routinely inspected in accordance with the SPCC <br /> by Mine personnel to assess effectiveness and integrity of each EPF system. The tanks are <br /> equipped with level detectors and local alarms that warn of high tank levels. <br /> Maintenance and/or updates to facilities, systems, equipment, or procedures are performed <br /> as needed to be protective of the environment and to prevent releases. <br /> Mine EPF 2.3—Sulfuric Acid Storage: Sulfuric acid is used at the URAD WTP to neutralize the pH <br /> of effluent water. Sulfuric acid is stored in a 4,000 gallon tank located between the URAD WTP <br /> building and the clarifier. <br /> Effectiveness: Sulfuric acid is stored in a plastic, double walled tank. Spills would be contained <br /> within the secondary containment and in the interstitial area between the two walls. Tertiary <br /> containment is provided by the URAD treatment ponds and low-lying area. <br /> Monitoring: Chemical storage containers are routinely inspected in accordance with the SPCC <br /> by Mine personnel to assess effectiveness and integrity of each EPF system. The tanks are <br /> equipped with level detectors and local alarms that warn of high tank levels or a leak. <br /> Maintenance and/or updates to facilities, systems, equipment, or procedures are performed <br /> as needed to be protective of the environment and to prevent releases. <br /> Climax Molybdenum Company August,2021 <br /> Henderson Operations Page 19 of 45 <br />