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TR-34 to Permit M-1977-342 <br /> Environmental Protection Plan <br /> 5.2. Known Potential to Affect Human Health and the Environment <br /> The following is a brief narrative description of the known potential to affect human health, <br /> property or the environment for the designated chemicals at Henderson. <br /> Mine <br /> Quicklime (water treatment) is used for metals precipitation in the URAD WTP process. <br /> Henderson receives dry quicklime, also known as dry lime, burnt lime or calcium oxide (CaC).The <br /> quicklime is subsequently hydrated or "slaked" to form calcium hydroxide (Ca(OH)2). The slaked <br /> lime is used to raise the pH of the water being treated to alkaline conditions, and metals are <br /> subsequently oxidized and precipitated. Contact can cause irritation to eyes, skin, respiratory <br /> system, and gastrointestinal tract. Quicklime reacts violently with water, releasing heat which <br /> may ignite combustible materials in certain instances. Contact with eyes can cause severe <br /> irritation or burning, including permanent damage. <br /> In the presence of acidic conditions such as acid rock drainage or acid mine drainage, quicklime <br /> reacts as an acid neutralizer and buffer. It can be used to raise the pH of acidic waters. Should <br /> quicklime be delivered directly into a non-process water or a non-acidic water environment, it <br /> would cause short-term impacts to aquatic communities by raising the system pH. Direct long- <br /> term impacts would be negligible to non-existent since calcium hydroxide would neutralize in the <br /> natural system and does not bio-accumulate. <br /> P812A Flocculant is an additive used in the URAD WTP to promote precipitation of metals. The <br /> resulting precipitate or sludge is thickened and removed from the treatment system using a <br /> clarifier. Waste sludge is removed and placed in a holding pond near the WTP and is ultimately <br /> characterized and shipped off-site for disposal. The product does not contain any hazardous <br /> components and is non-reactive, non-flammable, and a slight human health hazard. Eye <br /> protection and gloves should be worn when in contact with the product. In the environment, <br /> P812A is stable and non-hazardous. <br /> Sulfuric Acid is used for effluent neutralization in the URAD WTP. It is an acidic corrosive that can <br /> affect the human body through inhalation, ingestion, and dermal contact. It is corrosive to any <br /> tissue with which it contacts. Effects can vary from mild irritations to severe burns (internally or <br /> externally)depending upon the type, degree, and length of exposure. Strong inorganic acid mists <br /> containing sulfuric acid are carcinogenic to humans. Prolonged inhalation of fumes or mists may <br /> cause erosion of the teeth. Eye and face protection, protective clothing and gloves should be <br /> worn when in contact with the product. Where there is insufficient ventilation, wear respiratory <br /> protection. <br /> Sulfuric acid may be corrosive to metals. Contact with metals may evolve flammable hydrogen <br /> gas. May react exothermically with water releasing heat. Adding an acid to a base or base to an <br /> acid may cause a violent reaction. May act as an oxidizer. Sulfuric acid is acid forming in aquatic <br /> and terrestrial environments. It can be neutralized with the application of alkaline materials. <br /> Mill <br /> #2 Diesel Fuel is a combustible petroleum distillate commonly used as a heating fuel. At the Mill, <br /> it may be used as a collector reagent in the milling process in place of vapor oil. Aside from being <br /> Climax Molybdenum Company August,2021 <br /> Henderson Operations Page 10 of 45 <br />