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Road cu[ 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 tv:2h, except where embankment <br /> material is a minimum BS percent rock. Embankment slopes will not be steeper than <br /> 1v:1.35h unless it has been demonsCrat ed to the regulatory authority that embankment <br /> stability will result. The minimum safety factor far 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 />[he stability of the fill. <br /> Material used for embankments will be reasonably free of organic material, coal or coal <br /> blossom, frozen materi aLs, we[ or peat ma[eri al, natural soils containing organic matter <br /> or any other material considered unsuitable for use in embankment construction by [he <br /> Division. Excess or unsuitable ma terial 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 rack, broken stone, or <br />fragmented material [hat 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 [he layers will not exceed 36 inches. Rock will be distributed <br />by 6lading or dozing in a manner that will ensure proper placement in the embankment, so <br />that voids, pockets and hridging will be reduced to a minimum. The final layer will meet <br />the requirements of G.03.2(3)(d)(iv). <br />Each layer of [he embankment will be completed, leveled and compacted before the <br />succeeding layer is placed. Successive layers will be compacted evenly by routing dozers, <br />31 Revised 03/13/92 <br />