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Section 816.74 Continued. <br />• meats are utilized and provided the requirements of this Section and <br />Section 816.71 are met. For this Section, hard rock spoil shall be <br />defined as rockfill consisting of at least 80 percent by volume of <br />sandstone, limestone, or other rocks that do not slake in water. <br />Resistance of the hard rock spoil to slaking shall be determined by <br />using the slake index and slake durability tests in accordance with <br />guidelines and criteria established by the regulatory authority. <br />(a) Spoil is to be transported and placed in a specified and controlled <br />manner which will ensure stability of the fill. <br />(1) The method of spoil placement shall be designed to ensure mass <br />stability and prevent mass movement in accordance with the additional <br />requirements of this Section. <br />(2) Loads of noncemented clay shale and/or clay spoil in the fill shall <br />• be mixed with hard rock spoil in a controlled manner to limit on a unit <br />basis concentrations of noncemented clay shale and clay in the fill. <br />Such materials shall comprise no more than 20 percent of the fill volume <br />as determined by tests performed by a registered engineer and approved <br />by the regulatory authority. <br />(b)(1) Stab_lity analyses shall be made by the registered professional <br />- engineer. Parameters used in the stability analyses shall be based on <br />adeouate field reconnaissance, subsurface investigations, including <br />borings, and laboratory tests. <br />(2) The embankment which constitutes the valley fill or head-of-hollow <br />fill shall be designed with the following factors of safety: (see Table <br />as shown in Office of Surface hlining Permanent Regulatory Program, Book <br />3, Disposal of excess spoil: Durable rock fills). <br />• 816-101 <br />