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• will not result in significant environmental harm or harm to the public health and safety. <br />Temporary erosion control measures will be implemented during construction to minimize <br />sedimentation and erosion until permanent control measures can be established. The entire <br />road cut including the surrounding area disturbed by construction will be stabilized with <br />respect to erosion by a vegetation cover or other means approved by the Division <br />immediately after construction is complete. Where a vegetation cover is used, <br />consideration will be given to providing an appropriate growth medium. <br />Road embankments. All vegetation material and topsoil will be removed from the <br />embankment foundation during Construction to increase stability, end no vegetation materiel <br />or topsoil will be placed beneath or in any haul road embankment. Where an embankment is <br />to 6e placed an side slopes steeper than Sh:ty (20 percent), the existing ground will be <br />plowed, stepped, or if in bedrock, keyed in a manner which increases the stability of the <br />fill. The keyway will be minimum of 10 feet in width and will extend a minimum of 2 <br />feet below the toe of the fill. <br /> The materiel for embankments will be reasonably free or organic material, coal or coal <br /> i <br />l <br />t <br />bl <br />f t <br />i <br />l anic <br />ils <br />ntainin <br />r <br />t <br />l matter <br /> ossom, <br />a <br />s, we <br />or <br />rozer mater pea <br />mater <br />a <br />, co <br />g o <br />g <br />na <br />ura <br />so , <br /> or any other materiel considered unsuitable for use in embankment construction by the <br /> Division. Excess or unsuitable material from excavations will be disposed of in <br /> accordance with 4.09.1. <br />Acid-producing materials will be permitted for constructing embankments only for those <br />haul roads constructed or reconstructed on coal processing waste banks and only if it has <br />been demonstrated to the Division that no additional acid will leave the confines of the <br />coal processing waste bank. In no case will acid-bearing refuse materiel be used outside <br />the confines of the coal processing waste bank. Acid- and toxic-forming materials will be <br />disposed of in accordance with 4.05.8, 4.10.1, and 4.14.3. <br />Materiel containing by volume Less than 25 percent of rock larger than 6 inches in <br />greatest dimension wilt be spread in successive uniform layers not exceeding 12 inches in <br />thickness before compaction. <br />• Where the material for an embankment consists of large-size rock, broken stone, or <br />fragmented materiel that makes placing it in 12 inch layers impossible under <br />3 <br />