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<br />• Co1lecGOn Ditch <br /> <br />The main collection ditches in the permit area are the 007 North Ditch and the South Ditch. The 007 <br />North and South Ditches will be used to transport runoff into Sedimentation Pond 007 far treatment in <br />accordance with the requirements of applicable regulations. The design calculations on these can be <br />found at the end of this section in Attachment 2.05.3 (3}2. The location and drainage area of these <br />ditches can be found on Maps 2.05.3-1 and 2.05.3-5. <br />The 007 North D2ch and South Ditch have been designed and will be constructed in accordance with the <br />applicable regulations in 4.05.3. Diversions will be designed, constructed, and maintained in a manner <br />which prevents additional contributions of suspended solids Lo streamflow and to runoff outside the permit <br />area, to the extent possible, using the best technology currently available. Appropriate sediment control <br />measures for these diversions may include, but not be limited to, maintenance of appropriate gradients, <br />channel lining, revegetation, roughness structures, and detention basins. No diversion will be located sc <br />as to increase the potential for landslides. When no longer needed, each temporary diversion will be <br />removed and the affected land regraded, topsoiled, and revegetated in accordance with 4.06, 4.14, and <br />4.15. If the temporary diversion was for an ephemeral stream, the channel will be reestablished to <br />functionally blend with the undisturbed drainage above and below the area to be reclaimed. Diversicn <br />design will incorporate the following: <br />• (a) Channel linings, including channel riprap, will be designed using standard engineering <br />practices to pass safely the design velocities. - <br />(bJ Freeboard will be no less than 0.5 feet. Protection will be provided for transition of flows <br />and for critical areas such as swales and curves when excessive velocities are anticipated. <br />(c) Energy dissipaters will be installed when necessary at discharge points, where diversions <br />intersect with natural streams and exit velocity of the diversion flow is greater than that <br />of the receiving stream. <br />(dJ Excess excavated material not necessary for diversion channel geometry or regrading of <br />the channel will be disposed of in accordance with 4.09. <br />(e) Topsoil will be handled in compliance with 4.06 <br />Revised 411-94 <br />• 2.05.3(3) - 3 <br />