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Climax Molybdenum Company HENDERSON MINE & MILL SWMP <br />Empire & Parshall, CO December, 2011 <br /> <br />Page iii <br />REVISION HISTORY <br /> <br />When this SWMP is amended or updated, the date of the latest revision should be indicated <br />below along with a description of the changes that were made in accordance with Henderson’s <br />Control of Document Procedure within the Henderson Operation’s Environmental Management <br />System (EMS). Copies of this SWMP shall be made available upon request to the Environmental <br />Protection Agency (EPA) Director, EPA Regional Administrator, Colorado Department of <br />Public Health and Environment (CDPHE), or their authorized representatives. <br /> <br />Rev # Rev <br />Date <br />Revised <br />By: <br />Description of Revisions <br />- 2/1994 W.W. <br />Wheeler and <br />Associates <br />Initial Draft <br />1 7/1998 CH2M Hill • Updated format of SWMP <br />• Removed the following storm water outfalls: <br />• Aggregate Heating Boiler/Coils; <br />• ANFO Explosives Magazine #5 Shaft Yard; <br />• Temporary Storage of Sulfuric Acid – No. 2 Pond. <br />• Addressed relocation of PCB Storage Area at Mill <br />• Removal discussion of areas near 3-dam for storm <br />water discharges have been redirected to the process <br />water system <br />• Added storm water BMPs to for several areas at the <br />Mill that are not associated with storm water outfalls. <br />• Removal discussion of areas near 3-dam for storm <br />water discharges have been redirected to the process <br />water system <br />2 1999 Tony Lucero Revised to reflect that caustic soda and ethylene glycol <br />storage was removed from the #1 hoist house. <br />3 6/2001 Tony Lucero Updated secondary contact information for Mill to reflect <br />changes in job responsibilities. <br />4 5/2006 Aquionix, <br />Inc. <br />• Reformatted SWMP to match outline provided in <br />General Permit. <br />• Updated SWMP to reflect current personnel <br />• Updated discussions on non-storm water discharge and <br />discharges subject to effluent limitations. <br />• Improved discussion of Preventive Maintenance and <br />Good Housekeeping BMPs <br />• Removed references to daily inspections <br />• Added the Emrick and Hill Contractor Yard at the Mine <br />• Added the Upper Access Road and Mobile Equipment <br />Storage Yard as potential pollutant sources at the Mill <br />• Added locations of Storm water Outfalls to SWMP <br />Maps and included outfalls in Table 4.1 and <br />Inspections. <br />• Updated SWMP Maps