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to ensure that the embankment is adequate to support the anticipated volume of traffic and weight <br />• and speed of vehicles to be used. <br />Material will be placed in an embankment only when its moisture content is within acceptable levels <br />to achieve design compaction. <br />Temporary erosion control measures (ditches, berms, straw dikes, silt fence) will be utilized during <br />embankment construction to minimize sedimentation and erosion until permanent control measures <br />can be established. Immediately upon completion, measures will be taken to stabilize all <br />embankments with vegetation cover or other means as approved by the regulatory authority to <br />minimize erosion. Where a vegetation cover is used, consideration shall be given to providing an <br />appropriate growth medium. <br />Drainaoe. Each haul road not within areas disturbed by mining and reclamation activities will be <br />designed, constructed and maintained to have adequate drainage using ditches and culverts to <br />safely convey the peak runoff from a 10-year, 24-hour precipitation event while maintaining a <br />minimum of one half foot of freeboard to the top of the road embankment (see Map 2.05.3-3 for <br />typical details of drainage structures). <br />Drainage ditches will be placed at the toe of all cut slopes formed by the construction of haul roads. <br />Water will be intercepted before reaching a large fill and drained safely away in accordance with <br />the requirements of 4.03.1. Water from a fill will be released below the fill through conduits or in <br />adequately lined channels and will not be discharged onto the fill. <br />When drainage ditches discharge onto open terrain, a number of measures will be taken to protect <br />the terrain from erosion. When the drainage discharges onto a disturbed area, the area will be <br />revegetated to control runoff. In an area where revegetation would not be sufficient to control <br />erosion, the area will be rip-rapped. Temporary measures to reduce erosion will be employed while <br />the area is undergoing revegetation such as straw dikes, containment ditches, etc. WFC typically <br />constructs ditches on the inside of roadway cuts and safety berms for drainage. As most road cuts <br />are into resistant bedrock-type material, ditches normally do not require lining. Culverts will be <br />designed and installed to minimize the runoff volume conveyed in each ditch. Culverts and ditches <br />will typically be designed using SEDCAD or other generally accepted software to predict the peak <br />runoff and Manning's equation to determine the peak velocity and flow depth. <br />• (Revised ~/zoom 2.05.3(3) - 24 <br />