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May Day Idaho Mine Complex 112 (d) Permit Application <br />0 (b) Narrative Description <br />(i) Designated Chemical Handling <br />Chemicals will be handled and stored in accordance with MSDS criteria. <br />Specifically for this operation, this includes the following: <br />• All materials will be transported to their designated storage location via <br />vehicle and unloaded by hand; <br />• Storage locations will be locked and secured at all times; <br />• Wildcat personnel will be trained appropriately in the proper storage and <br />use of site specific chemicals during the milling operation; <br />• Chemicals used in the milling operation will be opened and used within <br />the mill only; and <br />• Small volumes of designated chemicals (<5 gallon/Ift) will be handled <br />at any given time. <br />Chemicals consumed in the milling process will be disposed as tailings within the <br />underground workings of the Mayday No. 1 operations as discussed in <br />Section6.4.20(19). <br />(ii) Toxic and/or Acid-Forming Material Handling <br />Available data on the mine rock indicates that it is neither toxic nor acid-forming <br />. (Section 6.4.20.14). Additionally, all material handling will occur underground <br />and disposed within a dry stope. Further testing will be done within the mill <br />optimization phase to confirm that the stope is suitable for the disposal of <br />tailings. <br />(iii) Off-site Impact Prevention <br />The following measures will be taken to prevent off-site impacts: <br />• Use of designated chemicals occurs approximately 1.0 mile inside permit <br />boundary; <br />• Only small quantities of designated chemicals (as defined by EPA) are <br />used at any given time; <br />• Spill prevention measures include bermed storage areas and paved floors <br />within storage and processing areas; <br />• Distance to water courses, and depth to groundwater (Section 6.4.20(8)) <br />allow for immediate containment during spill response of small volumes <br />minimizing exposure risk through off-site migration to these receptors; <br />• Monitoring programs will be implemented (Section 6.4.20(7)) at the <br />initiation of the milling phase. <br />r? <br />U <br />May Day Idaho Mine Complex 112(d) Permit Application <br />September 21, 2010 <br />5