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Section 816.152(d) Continued. • (9) The minimum safety factor for all embankments shall be 1.25, or such higher factor as the regulatory authority may specify. (10) The road surface shall be eloped toward the ditch line at a mini- mum rate of one-quarter inch per foot of surface width, or crowned at a minimum rate of one-quarter inche per foot of surface width as measured from the centerline of the road. (11) All material used in embankments shall be suitable for use under Paragraphs (d)(1)-(8) of this Section. The material shall be reasonably free of organic material, coal or coal blossom, frozen materials, wet or peat material, natural soils containing organic matter, or any other material considered unsuitable by the regulatory authority for use in embankment construction. (12) Excess or unsuitable material from excavations, as defined in • Paragraph (d)(11) of this Section, shall be disposed of in accordance with 30 CFR 816.71. Acid- and toxic-forming material shall be disposed of in accordance with 30 CFR 816.48, 816.81, and 816.103. (13) Acid-producing materials shall be permitted for constructing embankments for only those Class I Roads constructed or reconstructed on coal processing waste banks and only if it has been demonstrated to the regulatory authority that no additional acid will leave the confines of the coal processing waste bank. In no case shall acid-bearing refuse material be used outside the confines of the coal processing waste bank. Restoration of the road shall be in accordance with the requirements of 30 CFR 816.103-816.117. (14) Topsoil or other material suitable under 30 CFR 816.22 shall be placed on all embankment slopes of 1v:1.5h or flatter to aid in esta- blishing vegetation and to minimize erosion. Topsoil material depth shall be adequate to support vegetation and to prevent erosion. 816-185