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• When the material for an embankment consists of large size rock, broken stone, or fragmented <br />material that makes placing it in 12 inch layers impossible, the embankment will be constructed <br />in uniform layers not exceeding in thickness the approximate average size of the rock used, but <br />the layers will not exceed 36 inches. Rock will be distributed by grading or dozing in a manner <br />that will ensure proper placement in the embankment, so that voids, pockets and bridging will <br />be reduced to a minimum. The final layer will meet the requirements of 4.03.1(3)(d)(v). <br />Each layer of the embankment will be completed, leveled and compacted before the <br />succeeding layer is placed. Successive layers will be compacted evenly by routing dozers, <br />trucks and scrapers over the entire width of the embankment. This procedure will be continued <br />until no visible horizontal movement of the embankment material is apparent. Embankment <br />layers will be compacted to a minimum of 90 percent of Standard Proctor density or as directed <br />by the engineer to ensure that the embankment is adequate to support the anticipated volume <br />of traffic and weight and speed of vehicles to be used. <br />Material will be placed in an embankment only when its moisture content is within acceptable <br />levels to achieve design compaction. <br />Temporary erosion control measures (ditches, berms, straw dikes, silt fence) will be utilized <br />during embankment construction to minimize sedimentation and erosion until permanent control <br />measures can be established. Immediately upon completion, measures will be taken to <br />stabilize all embankments with vegetation cover or other means as approved by the regulatory <br />authority to minimize erosion. Where a vegetation cover is used, consideration shall be given <br />to providing an appropriate growth medium. <br />Drainage. Each haul road not within areas disturbed by mining and reclamation activities will <br />be designed, constructed and maintained to have adequate drainage using ditches and culverts <br />to 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 2.05.3-2 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 <br />roads. Water will be intercepted before reaching a large fill and drained safely away in <br />accordance with the requirements of 4.03.1. Water from a fill will be released below the fill <br />through conduits or in 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 <br />protect the terrain from erosion. When the drainage discharges onto a disturbed area, the area <br />(REVISED 12100) 2.05.3(3) -14 <br />