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been demonstrated to the regulatory authority that embankment stability will result. The minimum <br />safety factor for all embankments will be 1.25. • <br />• All vegetation material and topsail, as determined under 4.06.2, will be removed from beneath the <br />design roadbed, shoulders, and surfaces where associated structures will be placed, and will be <br />stored in accordance with Rule 4.06.3. <br />• Embankments will not be constructed on side slopes steeper than 5H:1 V or 20 percent unless the <br />existing ground is plowed, stepped or if in bedrock, keyed in a manner which increases the stability <br />of the fill. <br />• Material used for embankments will be reasonably free of organic material, coal or coal blossom, <br />frozen materials, wet or peat material, natural soils containing organic matter or any other material <br />considered unsuitable far use in embankment construction by the Division. Excess or unsuitable <br />material from excavations will be disposed in accordance with Rule 4.09.1. <br />Material for construction of embankments will come from the vicinity of the mining area and will be <br />non-toxic and of a non-acid producing nature. <br />Material containing, by volume, less than 25 percent of rock larger than 6 inches in greatest <br />dimension will be spread by scrapers or dozers in successive uniform layers not exceeding 12 <br />inches in thickness before compaction. <br />• 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 in <br />uniform layers not exceeding in thickness the approximate average size of the rock used, but the <br />layers will not exceed 36 inches. Rock will be distributed by blading or dozing in a manner that will <br />ensure proper placement in the embankment, so that voids, pockets and bridging will be reduced to <br />a minimum. The final layer will meet the requirements of Rule 4.03.1(3)(d)(v). <br />• Each layer of the embankment will be completed, leveled and compacted before the succeeding <br />layer is placed. Successive layers will be compacted evenly by routing dozers, trucks and scrapers <br />over the entire width of the embankment. This procedure will be continued until no visible <br />horizontal movement of the embankment material is apparent. Embankment layers will be <br />compacted to a minimum of 90 percent of Standard Proctor density or as directed by the engineer <br />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 />PR-05 18 Revised 01/06 <br />