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JD -6 Mine — Drainage Design Plan 44 <br />Additional sediment and erosion prevention practices that may be used at the JD -6 Mine include the <br />following: <br />• Silt Fences. A silt fence was constructed along the toe of the JD -6 Mine waste rock pile (Figure 4) <br />and is routinely inspected and maintained. Additional silt fencing will be employed where <br />necessary to contain sediment and prevent its migration. <br />• Straw Wattles. Straw wattles are not currently in use at the site, but may be employed to retain <br />sediment during construction activities. Contractors whose onsite activities have the potential to <br />affect stormwater may be required to prepare, submit, and implement a stormwater management <br />plan that addresses the specific site activities. These construction - specific activities may require <br />short-term sediment controls including, but not limited to, straw wattles and silt fences. <br />• Ditches and Berms. Ditches and berms are used to convey stormwater runoff toward catchments <br />and to prevent excess stormwater from entering facilities areas or eroding the waste rock piles. <br />Perimeter berms have been constructed and will be maintained at the crest of the waste rock pile to <br />route water away from the face of the pile and into constructed catchments. Additional ditches or <br />berms may be installed as needed within the permitted affected area during operations. <br />• Revegetation. The waste rock pile will be revegetated as soon as practicable after mining is <br />complete. Revegetation will follow the seed mix and procedures described in the Reclamation Plan <br />and EPP. The establishment of vegetation on the reclaimed facilities will reduce erosion and <br />sedimentation from formerly disturbed areas. <br />• Other BMPs. Additional BMPs may be used as necessary to check or direct water flow and <br />prevent erosion and sediment transport. <br />6.3 Post - Mining Stormwater Controls <br />After mining, the SWRP embankment will be breached to allow natural flow of water and eliminate the <br />need for maintenance. <br />4148A.131028 Whetstone Associates <br />