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• The horizontal alignment will be consistent with the existing and postmini ng topography <br /> and will be coordinated with the vertical alignment to ensure that the roads will not <br />cause excessive environmental damage. <br />Road cut slopes will not be steeper than 1v:1.5h in unconsolidated material or 1v:0.25h in <br />rock. Embankment fill slopes will not be steeper than 1v:1.5h, except where embankment <br />material is a minimum 85 percent rock. Embankment slopes will not be steeper than <br />1v:1.35h unless it has been demonstrated to the regulatory authority that embankment <br />stability will result. The minimum safety factor for all embankments will be 1.25. <br />All vegetation material and topsoil, as determined under 4.06.2, will be removed from <br />beneath the design roadbed, shoulders, and surfaces where associated structures will be <br />placed, and will be stored in accordance with 4.06.3. <br />Embankments will not be constructed on side slopes steeper than 1v:3h or 33 percent unless <br />the existing ground is plowed, stepped or if in bedrock, keyed in a manner which increases <br />the stability of the fill. <br />• <br />Material used for embankments will be reasonably free of organic material, coal or coal <br />blossom, frozen materials, wet or peat material, natural soils containing organic matter <br />or any other material considered unsuitable for use in embankment construction by the <br />Division. Excess or unsuitable material from excavations will be disposed in accordance <br />with 4.09.1. <br />Material for construction of embankments will come from the vicinity of the mining area <br />and will be 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 <br />greatest dimension wilt be spread by scrapers or dozers in successive uniform layers not <br />exceeding 12 inches in thickness before compaction. <br />When the material for an embankment consists of large size rock, broken stone, or <br />fragmented material that makes placing it in 12 inch layers impossible, the embankment <br />will be constructed in uniform layers not exceeding in thickness the approximate average <br />size of the rock used, but the layers rvill not exceed 36 inches. Rock will be distributed <br />by blading or dozing in a manner that will ensure proper placement in the embankment, so <br />that voids, pockets and bridging will be reduced to a minimum. The final layer will meet <br />the requirements of 4.03.2(3)(d)(iv). <br />13-26 Revised 08/19/88 <br />