2012-10-05_REVISION - M1977342 (14)

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Climax Molybdenum Company HENDERSON MINE & MILL SWMP Empire & Parshall, CO December, 2011 Page 5-3 5.2.2 Sediment Treatment/Removal When the above prevention methods do not adequately control sedimentation and erosion, the following structural treatment methods shall be used: • Construct sediment traps below excavations involving small water flow 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 straw wattles at, or prior to check dams, around drains, in stormwater channels, and where deemed necessary to control/stop sediment carried by stormwater. This type of BMP must be maintained and repaired/replaced as necessary to be effective in controlling sediment. 5.3 Preventive Maintenance Practices Preventive maintenance tasks associated with the Henderson Operations are managed through a computer based software program called SAP. Required maintenance has been identified and established for on-site equipment and processes. When new equipment is brought on site additional maintenance tasks shall be identified as required. Any deficiencies in preventive maintenance shall be identified during routine inspections performed by area workers and through regular audits performed by members of the Environmental Department. When issues are identified, they shall be brought to the attention of area supervisors and immediately addressed. Additional tasks shall be added to the SAP preventive maintenance system, as needed. 5.4 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. These practices include: • Prompt pickup of garbage and waste materials; • Storage of trash in closed containers, where feasible; • Regular cleanup of areas around trash dumpsters and other collection points; • Storage of trash and materials containers indoors, where feasible; • Outdoor storage of abandoned equipment, parts and containers is kept to a minimum; • Empty drum storage is kept to a minimum and drums shall be kept closed when there is potential for exposure to storm water; • Containers shall be elevated off the ground when there is a chance of corrosion or damage to the container associated with storm water or ground moisture; • Materials shall be stored in an orderly manner away from direct traffic routes; • Materials shall be reviewed for environmental hazards prior to being brought on-site and where feasible, less hazardous chemicals shall be used;