2012-10-05_REVISION - M1977342 (14)

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Climax Molybdenum Company HENDERSON MINE & MILL SWMP Empire & Parshall, CO December, 2011 Page 1-1 1.0 INTRODUCTION AND OBJECTIVES This Storm Water Management Plan (SWMP or Plan) has been prepared for the purpose of identifying potential sources of pollution which may reasonably be expected to affect the quality of storm water discharges associated with operation of the Henderson Mine and Mill Sites and the conveyor that connects them together. The Plan describes and provides guidelines for the implementation of both general best management practices (BMPs) and site- or activity-specific BMPs. These BMPs are designed to minimize the likelihood of pollutants being carried off-site through storm water discharges. This SWMP also provides information about the management of storm water that is combined with process waters being discharged under the provisions of Colorado Discharge Permit System (CDPS) Permit Number CO-0041467, and Permit Number CO-0000230, but does not specify activity-specific BMPs for process areas that are subject to the process water permit. Those activities are covered by the Spill Prevention Control and Countermeasures / Materials Containment Plans that are in effect at the mine and mill sites. The storm water boundaries, BMPs, and outfall locations discussed in this SWMP are based on surface discharges resulting from storm water events. The fate and control of groundwater associated with the facility’s process water is managed under a different authority and is beyond the scope of this SWMP. This SWMP has been formulated and will be implemented with the following objectives and goals: • To provide a simple format for inspection, control, prevention, and mitigation of potential pollution sources that may affect the quality of storm water discharge; • To provide a simple format for educating and training site personnel in methods and practices for storm water management and pollution prevention; and • To provide assurance that the provisions of CDPS General Permit for Storm Water Discharges Associated with Metal Mining Operations and ancillary activities, CDPS Permit No. COR-040000, are met.