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<br />Section 816.52 (d) Continued. <br />• <br />entire width of the embankment. This procedure shall be continued until <br />no visible horizontal movement of the embankment material is apparent. <br />(6) Embankment layers shall be compacted as necessary to ensure that <br />the embankment is adequate to support the anticipated volume of traffic <br />and weight and speed of vehicles to be used. In selecting the method to <br />be used for placing embankment material, consideration shall be given in <br />the design to such factors as the foundation, geological structure, <br />soils, type of construction and equipment to be used. A structural and <br />foundation analysis shall be performed to establish design standards for <br />embankment stability appropriate to the site. Publications of the <br />American Association of State Highway and Traffic Officers (AASHTO), <br />including AASHTO T-99, T-180, T-91, and the modified AASHTO test, or <br />other specifications generally recognized by transportation engineers as <br />adequate for design of highway embankments, shall be used to determine <br />the degree of compaction required, on the basis of soil type and the <br />anticipated volume of traffic and weight and speed vehicles to be used. <br />Compaction effort shall be adequate to achieve the degree of compaction <br />required. No lift shall be placed on a layer until the design density <br />is achieved throughout the layer. AASHTO specifications such as T-99, <br />T-180, the modified AASHTO test, or other comparable specifications <br />approved by the regulatory authority shall be used as guidelines for the <br />determination of the maximum dry density for granular materials. <br />(7) Material shall be placed in an embankment only when its moisture <br />content is within acceptable levels to achieve design compaction. <br />(8) Embankment slopes shall not be steeper than lv:2h, except that <br />where the embankment material is a minimum of 85 percent rock, slopes <br />shall not be steeper than 1v:1.35h if it has been demonstrated to the <br />regulatory authority that embankment stability will result. Where rock <br />embankments are constructed, they shall meet the requirements of Para- <br />graph (d)(4) of this Section. <br />816-184 <br />