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• III. Emergency Response Scenarios <br />CC&V has evaluated the potential for releases of cyanide at its operations and subsequent <br />exposures. Based on this evaluation, CC&V determined that some potential, whether an <br />occurrence is probable or not, may exist for the following release and exposure scenarios to <br />occur under extreme upset conditions. <br />1. Release of hydrogen cyanide gas from cyanide storage or.process facilities; <br />2. Transportation accidents occurring on-site; <br />3. Releases during unloading cyanide; <br />4. Releases during mixing of cyanide; <br />5. Releases due to fires and/or explosions in the process plant; <br />6. Ruptures or leaks in pipes, valves, and/or tanks containing cyanide solution; <br />7. Overtopping of the internal cyanide. solution reservoirs in the valley leach facility (VLF); <br />8. Power outages including failure of backup generator power; <br />9. Pump failures; <br />10. Uncontrolled seepage from the VLF; <br />11. Failure of the emergency cyanide treatment system for the External Storage Pond; <br />12. Structural failure of the VLF; <br />13. Solution release potential flow paths. <br />• Each of these release potentials is discussed in additional- detail below: <br />1. Release of hydrogen cyanide gas from cyanide storage or process facilities <br />A significant release of hydrogen cyanide gas could result from mixing cyanide reagent or <br />process solution with acidic solution. <br />Such a release is considered to be unlikely as the facility is designed to ensure the physical <br />separation of acids and cyanide solution, and all personnel are trained to operate the facility to <br />avoid mixing. <br />CC&V's procedures for regular inspections and preventative maintenance. of all cyanide <br />management facilities and employee training in the proper operating procedures for off loading <br />and use of acids and cyanide minimize the risk of an incident. Further, separate secondary <br />containment is provided for acid and cyanide storage including delivery pumps and piping. <br />2. Transportation accidents occurring on-site <br />Transportation accidents on-site could occur but are minimized by the short distance from the <br />guard gate to the cyanide off load containment pad. Cyanide is shipped as dry product and in <br />specially designed high strength trailers designed to withstand highway level impacts. Any on- <br />site accident, should one occur, would reasonably be at low speed given the area of cyanide <br />delivery truck operation. Since product is shipped dry; should a release occur, dry clean up <br />procedures would be used. <br />• Cyanide Emergency Response Plan September 25, 2006 <br />EMS: AGANA/CCV Doc:# E-012 <br />S:\4010-00055 CC & V 112(d) Permit Application\ERP, SPCC, FMP\Cyanide Emergency Response Plan.doc Revision 03 <br />-3- <br />