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• Road cut slopes will not be steeper than 1v:1.5h in unconsolidated material or 1v:0.25h in rock. <br />Embankment fill slopes will not be steeper than iv:2h, except where embankment material is a <br />minimum 85 percent rock. Embankment slopes will not be steeper than iv:1.35h unless it has been <br />demonstrated to the regulatory authority that embankment stability will result. The minimum safety <br />factor for all embankments will be 1.30. <br />All vegetation material and topsoil, 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 stored <br />in accordance with 4.06.3. <br />Embankments will not be constructed on side slopes steeper than 1v:3h or 33 percent unless the <br />existing ground is plowed, stepped or if in bedrock, keyed in a manner which increases the stability of <br />the fill. <br />Material used for embankments will be reasonably free of organic material, coal or coal blossom, frozen <br />materials, wet or peat material, natural soils containing organic matter or any other material considered <br />unsuitable for use in embankment construction by the Division. Excess or unsuitable material from <br />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 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 dimension <br />will be spread by scrapers or dozers in successive uniform layers not exceeding 12 inches in thickness <br />before compaction. <br />When the material for an embankment consists of large size rock, broken stone, or fragmented material <br />that makes placing it in 12 inch layers impossible, the embankment will be constructed in uniform <br />layers not exceeding in thickness the approximate average size of the rock used, but the layers will not <br />exceed 36 inches. Rock will be distributed by blading or dozing in a manner that will ensure proper <br />placement in the embankment, so that voids, pockets and bridging will be reduced to a minimum. The <br />final layer will meet the requirements of 4.03.21311e)Ivl. <br />Each layer of the embankment will be completed, leveled and compacted before the succeeding layer is <br />placed. Successive layers will be compacted evenly by routing dozers, trucks and scrapers over the <br />entire width of the embankment. This procedure will be continued until no visible horizontal movement <br />of the embankment material is apparent. Embankment layers will be compacted to a minimum of 90 <br />• percent of Standard Proctor density or as directed by the engineer to ensure that the embankment is <br />adequate to support the anticipated volume of traffic and weight and speed of vehicles to be used. <br />TR-50 31 Revised 11/04 <br />