2011-08-08_REVISION - M1977493 (33)

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• • • Technical Revision (TR -18) Climax Molybdenum Company Environmental Protection Plan Permit No. M- 1977 -493 The Nokes will be stored in one tank with a capacity of 18,000 gallons. The Nokes will be stored in the reagent storage area of the mill building (see Mill Building Detail - Area 450 on the south side of the mill building on Figure AM- 06- T -06). Secondary containment with a volume greater than that of the tank will be provided in the reagent storage area (see Reagent Storage Area Detail Figure AM- 06- T -07). Tank level indication will be available locally as well as through the control system. The control system will alarm for a given tank low and high level. A local alarm horn will sound for a given tank high level. In the event of a storage tank failure, the Nokes will be contained in the reagent storage area via secondary containment. The secondary containment area is equipped with a sump but no sump pump. In the event of a release in this area, a pump will be placed in the secondary containment sump and the Nokes will be routed back into the process circuit or pumped into a suitable container for proper disposal through direction from the environmental department. A spill that occurs during offloading into the storage tank will be handled similarly using a sump located in the offloading area. In the event of a Nokes distribution system failure, the Nokes will be contained within the mill building and will be sent to tailings or the rougher concentrate thickener depending on where the failure occurs. T -3.3 Water Treatment Chem /ca /s information T -3.3.1 Flocculent GreatFloc 5500 is used as a flocculant to facilitate nucleation and settling of hydroxide precipitates. GreatFloc 5500 is a non - hazardous, common commercial flocculant used in the SDP. GreatFloc is an acrylamide polymer that may irritate the skin or eyes. Impermeable gloves and chemical splash goggles should be utilized when working with the chemical to prevent exposure. If the product is released to the environment, it should be contained with absorbent and removed. T - 3.3.2 Lime (Calcium Oxide) Calcium Oxide (CaO), also known as lime or quicklime, is used in the water treatment circuit at Climax to raise the pH and lower metal levels through precipitation. Lime also is used in reclamation operations and at the mill to adjust the pH of process water. Lime is stored at the Lime Station and in small stockpiles associated with current reclamation. Lime is a common, but strong caustic alkali. In high concentrations, lime can cause caustic irritation, inflammation, and burns through inhalation and dermal contact. Excessive amounts of lime in the environment can raise alkalinity to damaging levels. In aquatic systems, excessive lime also can cause potentially damaging precipitation /sedimentation. T - 3.3.3 Sulfuric Acid Sulfuric acid (H is used to adjust the pH of treated water to within the permit stipulated range of pH 6.5 - 9.0 prior to discharge to Tenmile Creek. Sulfuric acid is a corrosive that can affect the human body through inhalation, ingestion, and dermal contact. Effects can vary from mild irritations to severe burns (internally or externally) depending upon the type, degree, and length of exposure. Repeated chronic exposure to dilute solutions may cause dermal irritations, whereas similar exposure to vapors or mists may cause erosion of teeth and inflammation of the eyes and mucus membranes of the nose, throat, and lungs. In the environment, sulfuric acid can be directly toxic through its corrosive nature or by lowering pH levels to the point of toxicity. In addition, even in very dilute forms, which may not be injurious to human health, chronic releases of sulfuric acid can dissolve metals from rocks which, in turn, can damage aquatic and, in some instances, terrestrial ecosystems. Sulfuric acid is readily neutralized by the addition of alkaline substances such as NaOH, CaO, or limestone. EPP: Revision R1 T -10 July 2011