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<br />6.0 DESIGNATED CHEMICALS <br />• DEFINITION OF DESIGNATED CHEMICALS: TOXIC OR ACIDIC CHEMICALS USED <br />WITHIN THE PERMIT AREA IN EXTRACTIVE METALLURGICAL PROCESSING, THE <br />USE OF WHICH, AT CERTAIN CONCENTRATIONS, REPRESENTS A POTENTIAL <br />THREAT TO HUMAN HEALTH, PROPERTY, OR THE ENVIRONMENT. <br />There aze currently no chemicals used at the San Luis Project that fit the definition of <br />"designated chemicals." However, there are chemicals that will be used in association with the <br />water treaunent facility that could pose a potential threat to human health, property, or the <br />environment. For that reason, the chemicals used in the water treatment facility are described in <br />the following paragraphs. <br />6.1 Sodium Hydroxide <br />1. Potential affects to human health, property, and environment (see M$DS located in <br />Appendix A of this document) <br />2. Sodium hydroxide is used in the water treatment process to pre-treat the influent <br />• stream to cause an initial reduction in the concentrations of iron amd manganese. <br />Ultimately, the sodium hydroxide is consumed in the water treatment process with the <br />basic pH neutralized by the addition of hydrochloric acid. Details of the storage, <br />handling, and emergency response in case of a spill are described in the ERP. <br />3. MSDS (see Appendix A of this document). <br />4. Disposal, decommission, detoxification, and stabilization are all discussed and <br />described in the ERP. <br />5. Measures taken to prevent release, including secondary containment, are presented in <br />the ERP. <br />6. Sodium hydroxide is stored inside the water treatment facility, where the appropriate <br />controls have been engineered into the design of the building to provide for safe <br />handling and storage (see the ERP). <br />7. Potentials to produce acid mine drainage. (see acid generation neutralization <br />potential tests, humidity cell tests, baseline studies, Exhibits D.6.4.4 and D.3.3, <br />Appendix F, TR-018, and the TR-015 Response Plan) <br />U <br />Battle Mountain Resources, /nc. Shepherd Mi!!er lnc. <br />yatuolsav-~~.,y~me..,,,,d.evlA~sx 5 Ocrober 28, /999 <br />