2021-08-17_REVISION - M1977342 - Laserfiche WebLink

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Climax Molybdenum Company HENDERSON MINE SWMP Empire, CO April 2021 5.2.2 Sediment Removal When the above prevention methods do not adequately control sedimentation and erosion, the following structural removal methods shall be used: • Construct sediment traps below excavations involving small water now rates that cannot be bypassed around the excavation. • Construct storm water detention ponds and sediment basins for collecting runoff and slowing the velocity enough to settle the sediment. • Construct silt fences, straw bale barriers, or gravel/sand filters at the toe of slopes where erosion prevention is not practical or sufficient to deter all erosion; or where the terrain is too steep for construction of sediment traps. • Construct rock check dams to prevent sediment from traveling through channels, drains, and outfalls. • Install wattles at, or prior to check dams, around drains, in storm water channels, and where deemed necessary to control/stop sediment carried by storm water. This type of BMP must be maintained and repaired/replaced as necessary to be effective in controlling sediment. 5.2.3 Preventive Maintenance Practices Preventive maintenance tasks associated with operations are managed through a computer- based software program. Required maintenance has been identified and established for storm water management devices, such as storm water diversion ditches, and for on-site equipment and processes used to prevent conditions that could cause breakdowns or failures resulting in discharges of pollutants to surface waters. When new equipment is brought on site additional maintenance tasks shall be identified as required. Deficiencies in preventive maintenance may be identified during routine inspections performed by area workers and through regular inspections performed by members of the Environmental Department(see Section 7.0). When issues are identified, they shall be brought to the attention of area supervisors and immediately addressed. Additional tasks shall be added to the preventive maintenance system, as needed. 5.2.4 Good Housekeeping and Materials Handling Good housekeeping and materials handling practices are designed to maintain a clean and orderly work environment, reducing the possibility of storm water contamination. In addition to routine maintenance and inspections completed by the Environmental Department, additional housekeeping is managed through daily work area inspections conducted by all staff at the Mine. Identified issues are addressed as soon as possible and may be entered into the work order preventive maintenance system for ongoing management, as necessary. All Henderson staff receive training on proper materials handling and spill response on an annual basis. 5.3 Spill Prevention and Response Procedures Page 5-3