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The horizontal alignment will be consistent with the existing and postmining 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 lv:1.5h in unconsolidated material or lv:0.25h in <br /> rock. Embankment fill slopes will not be steeper than lv:1.5h, except where embankment <br /> material is a minimum 85 percent rock. Embankment slopes will not be steeper than <br /> lv: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 lv: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 /> 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 will 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 will 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 /> 13-25 Revised 08/19/88 <br />