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D. The riprap size for the minimum grade for ditches F16, East Diversion Ditch <br />and West Diversion Ditch #2 are listed in Appendix B on page App-B9. It <br />appears that the riprap size for the maximum ditch grade should be listed. <br />Please revise Appendix B accordingly. <br />E. There is no D50 riprap size listed in Appendix B for West Diversion Ditch W. <br />Please include in the appendix the appropriate riprap size for the maximum <br />ditch grade. <br />F. For ditches F7, F11 and F14, a freeboard of 0.3 feet is used in the ditch designs <br />but a freeboard of 1.0 feet is used in the minimum ditch depth requirement list <br />on Figure 3. Please revise accordingly. <br />G. As shown in Section B-B' for Sediment Pond F on Figure 3, the elevation of <br />the 10 year-24 hour storage event is the same as the elevation of the emergency <br />spillway. BRL will need to ensure proper sediment cleanout so that, as required <br />by Rule 4.05.9((2)(b), no runoff from a 10 year-24 hour precipitation event can <br />flow out of the emergency spillway. <br />Reclamation Cost Estimate <br />11. The Division has determined that the reclamation cost estimate does not need to be <br />revised for TR-61. <br />If you have any questions, please call me. <br />Sincerely, <br />sep J. dash <br />Environmental Protection Specialist <br />cc: Jim Stover P.E. (J.E. Stover & Associates) <br />c:\word2007\bowie2\tr6l adegI <br />5