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1D-8 Mine EPP-Stormwater Management Plan 3 <br /> 1111) <br /> No facilities are currently in operation. Routine site activities include monthly sampling of the lysimeter <br /> and mine inspections. Table 1 lists the potential contributors to stormwater during routine site activities. <br /> Table 1. Routine Site Activities and Conditions Having the Potential to Affect Stormwater <br /> (Potential Contributors of Pollutants to Stormwater- Routine) <br /> Area Activity or Condition <br /> Access road Travel to/from lysimeter monitoring site; air monitoring, BMP inspections, <br /> and mine inspections <br /> Waste Rock Dumps Potential for erosion from existing waste rock pile <br /> Ephemeral Drainage Potential for erosion from ephemeral drainage <br /> 4.3 Stormwater Structural Controls and Best Management Practices (BMPs) <br /> Existing structural controls on stormwater flow are shown in Figure I. Typical best management practices <br /> (BMPs) for stormwater control include stormwater diversion, sediment and erosion prevention, material <br /> handling and spill prevention, and other pollution control measures. <br /> 4.3.1 Stormwater Diversion <br /> Stormwater diversion is described in the site drainage plan(Attachment A). <br /> 11111 4.3.2 Materials Handling and Spill Prevention <br /> Materials handling is described in the EPP for the JD-8 Mine. <br /> Safe operating procedures will be followed to prevent spills that could potentially affect stormwater. <br /> Because the volume of fuel and oils stored onsite will be less than the regulatory threshold of 1,320 gallons, <br /> a spill containment plan is not required (40 CFR 112, U.S. EPA Spill Prevention, Control, and <br /> Countermeasure Regulation). <br /> In the event of a spill of significant quantities of materials which could affect stormwater runoff from this <br /> site, the SWMP administrator will be notified immediately. The administrator will determine cleanup <br /> procedures and see that clean up is properly implemented. Spill prevention and cleanup materials will be <br /> stored onsite during operations, and may include rice hulls, sorbent blankets, kitty litter, neutralizer, drip <br /> pans, and other products to prevent or mitigate spills. <br /> 4.3.3 Sediment and Erosion Prevention <br /> Several practices are employed at the JD-8 Mine to reduce erosion and prevent sediment delivery to State <br /> waters. Although no intermittent or perennial streams have been mapped on the JD-8 Lower Mine Permit <br /> Area, these sediment and erosion prevention measures are intended to prevent sediment delivery to <br /> ephemeral channels (incised channels that are mostly dry, but may flow temporarily in response to rainfall <br /> or snowmelt). <br /> Sediment and erosion prevention practices in use and planned or considered for the JD-8 Mine include the <br /> following: <br /> • Silt Fences. A silt fence was constructed downslope of the soils stockpile (Attachment A) and is <br /> routinely inspected and maintained. Additional silt fencing will be employed where necessary to <br /> 010 contain sediment and prevent its migration. <br /> 4122A.110601 Cotter Corporation <br />