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TR-34 to Permit M-1977-342 <br /> Environmental Protection Plan <br /> Effectiveness: Releases of this chemical would be directed to the tailing delivery line. <br /> Monitoring: Chemical storage containers are routinely inspected in accordance with the SPCC <br /> Plan by Mill personnel to assess effectiveness and integrity of each EPF system. Maintenance <br /> and/or updates to facilities, systems, equipment, or procedures are performed as needed to <br /> be protective of the environment and to prevent releases. <br /> Mill EPF 2.10 - Nokes Storage: Nokes is used in the mill circuit to selectively depress sulfides of <br /> lead and other metals during the flotation process. Pre-mixed liquid Nokes reagent is stored in <br /> a 21,800 gallon tank within the Mill building. <br /> Effectiveness: Releases of this chemical would be contained directly by the Mill sump system. <br /> The Mill sump also contains a high-level alarm to provide warning in the event of a large release. <br /> Monitoring: Chemical storage containers are routinely inspected in accordance with the SPCC <br /> Plan by Mill personnel to assess effectiveness and integrity of each EPF system. Maintenance <br /> and/or updates to facilities, systems, equipment, or procedures are performed as needed to <br /> be protective of the environment and to prevent releases. <br /> Mill EPF 2.11—Hydrated Lime Storage: Hydrated lime will be used at the Mill WTP to precipitate <br /> metals. Lime will be stored in an approximate 50 ton silo on the south side of the WTP building <br /> and fed to a 250 gallon tank inside the WTP for mixing. <br /> Effectiveness: Hydrated lime is non-viscous and is easily contained and cleaned-up. The area <br /> immediately surrounding the WTP will be asphalt paved. The improved area will be graded to <br /> route any spills to perimeter stormwater collection swales which, in turn, will convey drainage <br /> to the Bear Paw Drainage Pipeline inlet. The Bear Paw pipeline conveys these flows to the TSF. <br /> Any spills inside the Mill WTP will be contained by a sealed concrete floor sloped to a central <br /> trench drain system that flows to sumps that will be collected and recycled back through the <br /> system. <br /> Monitoring: Chemical storage containers will be routinely inspected in accordance with the <br /> SPCC by Mill personnel to assess effectiveness and integrity of each EPF system. The tanks are <br /> generally 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 /> Mill EPF 2.12 — DAF-10 Flocculent Storage: DAF-10 Flocculent will be used at the Mill WTP to <br /> improve settling of sludge in the clarifier. Bags of flocculent will be stored on a pallet in the Mill <br /> WTP building. The raw, dry flocculent is mixed with water in a 100 gallon mixing tank, then <br /> transferred to a 140 gallon dosing tank prior to being added into the treatment process. <br /> Effectiveness: The flocculent mixing tank and storage tank are contained within one system as <br /> an over/under tank system and will sit within a secondary containment within the WTP <br /> building. The Mill WTP will provide tertiary containment and will be constructed with a sealed <br /> concrete floor sloped to a central trench drain system that flows to sumps such that all spills <br /> will be collected within this system and recycled to the HDS reactor tanks. <br /> Climax Molybdenum Company August,2021 <br /> Henderson Operations Page 28 of 45 <br />