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• Topsoil will be removed end stockpiled in accordance with the topsoil salvage plan. <br />The vertical alignment of the access roads will not exceed 10 percent on the overall <br />grade. Maximum pitch grade rill not exceed 15 percent, and there rill not be more than <br />300 feet of pitch grade exceeding 10 percent ri thin any consecutive 1,000 feet. <br />The horizontal alignment will be consistent rith 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 />0.oed cut slopes will not be steeper than tv:1.5h in unconsolidated material or 1v:0.25h in <br />rock. Embankment fill slopes rill not be steeper than 1v:2h, except where embankment <br />materiel 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 materiel end topsoil, es determined under 4.06.2, rill be removed from <br />beneath the design roadbed, shoulders, and surfaces rh ere associated structures will be <br />placed, and rill be stored in accordance ri th 4.06.3. <br />Embankments rill 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 rh ich increases <br />the stability of the till. <br />Naterial used for embankments rill 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 materiel from excavations rill be disposed in accordance <br />rith 4.09.1. <br />Material for construction of embankments will come from the vicinity of the mining area <br />and rill be non-toxic end of a non-acid producing nature. <br />Naterial containing, by volume, less than 25 percent of rock larger then 6 inches in <br />greatest dimension rill 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 consi s[s of large size rock, broken stone, or <br />25 <br />