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All surface mining operations will be conducted to achieve the effluent limitations of 4.05.27(7) for <br />all mixed drainage when it leaves the permit area. <br />Sedimentation ponds or impoundments will be constructed before creating new disturbances, <br />unless approved drainage diversions or other surface water control structures are installed. <br />Collection Ditches <br />The main collection ditches in the original permit area are the 007 East and 007 West Ditch. The <br />007 East and West Ditches will be used to transport runoff into Sedimentation Pond 007 for <br />treatment in accordance with the requirements of applicable regulations. The design calculations <br />on these can be found at the end of this section in Attachment 2.05.3 (3)-2. The location and <br />drainage area of these ditches can be found on Maps 2.05.3-1 and 2.05.3-5. <br />The 007 East and West Ditches have been designed and will be constructed in accordance with <br />the applicable regulations in 4.05.3. Diversions will be designed, constructed, and maintained in <br />a manner which prevents additional contributions of suspended solids to stream flow and to runoff <br />outside the permit area, to the extent possible, using the best technology currently available. <br />Appropriate sediment control measures for these diversions may include, but not be limited to, <br />maintenance of appropriate gradients, channel lining, revegetation, roughness strucfures, and <br />detention basins. No diversion will be located so as to increase the potential for landslides. When <br />no longer needed, each temporary diversion will be removed and the affected land regraded, <br />topsoiled, and revegetated in accordance with 4.06, 4.14, and 4.15. If the temporary diversion was <br />for an ephemeral stream, the channel will be reestablished to functionally blend with the <br />undisturbed drainage above and below the area to be reclaimed. Diversion design will incorporate <br />the following: <br />(a) Channel linings, including channel riprap, will be designed using standard <br />engineering practices to pass safely the design velocities. <br />(b) Freeboard will vary from 0.5 - 5.0 feet. Protection will be provided for transition of <br />flows and for critical areas such as swales and curves when excessive velocities are <br />anticipated. <br />(c) Energy dissipators will be installed when necessary, such as at discharge points, <br />where diversions intersect with natural streams and exit velocity of the diversion <br />flow is greater than that of the receiving stream. <br />(REVISED 12!00) 2.05.3(3) - 3 <br />