2012-10-05_REVISION - M1977342 (12)

Home Browse Search

TR -18 to Permit M- 1977 -342 Environmental Protection Plan 10. SURFACE WATER CONTROL AND CONTAINMENT FACILITIES 10.1. Surface Water Control As discussed earlier related to Mill EPF 3.1 and Mine EPF 1.2, a key strategy utilized by Henderson to prevent potential storm water pollution is to minimize the amount of storm water that can come into contact with disturbed land and other industrial activities. The Mine and Mill have installed the following diversionary systems: • A storm water interceptor canal (known at the Ultimate Canal) has been constructed around the west and north ends of the tailings storage facility and delivers un- impacted storm water around the north end of the property to the Williams Fork River; • A collection system has been constructed to divert storm water from drainages southwest of the Mill property through an underground diversion pipe to the Williams Fork River; • Diversion ditches have been constructed on the south side of the Mine office and surface operations to divert water around industrial activities to the east end of the property; and • Diversion ditches have been constructed around the west end and along the north side of the Mine property and deliver un- impacted storm water to the West Fork Clear Creek. Design specifications and final certification for EPFs associated with surface water conveyance, capture and storage are submitted to the DRMS each time a modification to the Permit is proposed, as required. 10.2. Storm Water Management Plan Henderson's SWMP (Appendix B) has been prepared for the purpose of identifying potential sources of pollution reasonably expected to affect the quality of storm water discharges associated with operation of the Henderson Mine and Mill Sites and the conveyor that connects the sites together. The plan describes and provides guidelines for the implementation of both general best management practices (BMPs) and site - specific or activity- specific BMPs. These BMPs are designed to minimize the likelihood of pollutants being carried off -site through storm water discharges. The SWMP (Appendix B) 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 No. CO- 0041467 and CO- 0000230. The storm water boundaries, BMPs, and outfall locations discussed in the SWMP (Appendix B) are based on surface discharges resulting from storm water events. The SWMP (Appendix B) was developed to achieve the following objectives and goals: 1. To provide a simple format for inspection, control, prevention, and mitigation of potential pollution sources that may affect the quality of storm water discharge. 2. To provide a simple format for educating and training site personnel in methods and practices for storm water management and pollution prevention. 3. To provide assurance that the provisions of CDPS General Permit for Storm Water Discharges Associated with Metal Mining Operations and ancillary activities are met. Climax Molybdenum Company Henderson Operations October, 2012 Page 29 of 40