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Section S16.162 (d) Continued. • (2) Where an embankment is to be placed on side slopes exceeding lv:6h (20 percent), the existing ground shall be plowed, stepped, or, if in bedrock, keyed in a manner which increases the stability o: the fill. The keyway shall be a minimum of 10 feet in width and shall extend a minimum of 2 feet below the toe of the fill. (3) Material containing by volume less than 25 percent cf rock larger than 6 inches in greatest dimension shall be spread in successive uni- form layers not exceeding 12 inches in thickness before compaction. (4) 4m ere the material for an embankment consists of large-size rock, broken stone, or fragmented material that makes placing it in 12-inch layers impossible under paragraph (d)(3) of this Section, the embankment shall be constructed in uniform layers not exceeding in thickness the approximate average size of the rock used, but the layers shall not exceed 36 inches in thickness. Rock shall not be dumped in final posi- tion, but shall be distributed by blading or dozing in a manner that _ will ensure proper placement in the erliarkment, so that vcids, pockets and bridging will be reduced to a minimum. The final layer of the embankment shall meet the reouirements o` paragraph (d)(3) of this Section. (6) Each layer of the eT~ankment shall be completed, leveled, and compacted before the succeeding layer is placed. Loads of material shall be leveled as placed and kept smooth. The successive layers shall be compacted evenly by routing the hauling and leveling equipment over the entire width of the embankment. This procedure shall be continued until no visible horizontal movement of the embankment material is apparent. (6) Embankment layers shall be compacted as necessary to ensure that the embankment is adequate to support the anticipated volume of trzffic and weight and speed of vehicles to be used. In selecting the method to • be used for placing embankment material, consideration shall be given in 816-181