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• 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:5h or 20 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 or <br />any other material considered unsuitable for use in embankment construction by CDMG. <br />Excess or unsuitable material from excavations will be disposed in accordance with 4.09.1. <br />• Material for construction of embankments will come from the vicinity of the mining area and <br />will be non-toxic and of a non-acid producing nature. <br />Material containing, by volume, Tess 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 <br />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 will <br />be constructed in uniform layers not exceeding in thickness the approximate average size of <br />the rock used, but the layers will not exceed 36 inches. Rock will be distributed by grading or <br />dozing in a manner that will ensure proper placement in the embankment, so that voids, <br />pockets and bridging wiH be reduced to a minimum. The final layer will meet the <br />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 <br />(Revised July 2006) 2.05.3(3)-28 <br />