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Transit Mix Concrete Co. <br /> Response: There are no planned drop culverts, and this text has been removed from <br /> Exhibit G. <br /> 9. Page G-25, last paragraph, detention basin reclamation. The narrative states "For reclamation, <br /> the [notch] fill will be removed and the bedrock cut exposed to allow a positive drainage from <br /> the reclaimed pit areas." The Division expects these notches will have near vertical side walls <br /> and may have significant depth. Please address how these notches will be safe for both people <br /> and wildlife after reclamation. <br /> Response: The "notch" cut will be sloped at 3H:1 V to prevent vertical side walls and to <br /> allow access by wildlife and ranch personnel. These slopes will be graded, topsoiled, and <br /> revegetated similar to the other areas of the quarry. The reclaimed contours are shown on <br /> the Exhibit F maps. <br /> 10. Attachment G-1, SEDCAD Model Reports. The Division could not locate a map or figure <br /> delineating SEDCAD structures and subwatersheds which is necessary to review the SEDCAD <br /> model input and results. It also appears that some time of concentration estimates include <br /> overland/sheet flow segments greater than 300 feet (e.g., "Filename: Sediment Ponds2_100- <br /> Pl.sc4" Stru #4, SWS #1 is 1,835 horizontal feet). TR-55 Upland method for time of <br /> concentration calculations limits overland flow segments to less than 300 feet (see top of page 6) <br /> and based on experience should be shorter as slopes increase. Please review all times of <br /> concentration estimates to ensure proper methodology and model input is appropriate and <br /> provide a subwatershed/structure routing delineation map. <br /> Response: The SEDCAD calculations were revised to adjust the maximum flow length for <br /> overland flow to 300 feet. Professional experience shows that the TR-55 manual limits are <br /> not always correct. It was our initial assumption and field observations that due to the <br /> vegetative and litter cover the overland flow would occur for a much longer distance than <br /> indicated in the standard rangeland condition of the TR-55 manual. <br /> 11. Figures G-8a through G-12 nomenclature vs. Table G-7. The Culvert IDs in the Figures for <br /> sediment ponds RE-SP-3 and -4 (RD-SP-3-CC-1 and RD-SP-4-CC-I, respectively) could not be <br /> located in Table G-7. However, Table G-7 Culvert IDs RD-SP-CC-3 and -4 could not be found <br /> in the Exhibit G figures. Are these the same culverts? If so, please correct either the Table or the <br /> Figures. If not, please explain the discrepancies. <br /> Response: The Exhibit G figures have been revised to more clearly label the culverts and <br /> other water management structures. <br /> Hitch Rack Ranch Quarry(M-2017-049) <br /> Response to Comments—March 9,2018 <br />