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Culverts. Each haul road will be designed, constructed, and maintained to have adequate drainage <br />using ditches and culverts to safely convey the peak runoff from a 10-year, 24-hour precipitation event <br />to sediment ponds before being released from the permitted area Isee Exhibits 13-2 and 13-2A for <br />general locations and Exhibit 13-10 for typical details o1 drainage structuresl. <br />Culverts will be installed to avoid plugging or collapse and to avoid erosion at the inlets and outlets. <br />Riprap will be installed as necessary to reduce the exit velocity. <br /> <br /> <br />7 g Revised 9/98 <br />