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Section 816.152 (b) Continued. <br />horizontal curve beglna or ends at the crest or sag of a vertical <br />curve and 1n such a manner as to control erosion, simplify drainage <br />design and maximize safety and environmental results. <br />(c) Road Cuts. <br />(1) Cut slopes shall not be steeper than specifically authorized by the <br />regulatory authority which shall not authorize slopes steeper than <br />1v: 1.Sh in unconsolidated materials or 1v:0.25h 1n rock, except that <br />steeper slopes may be specifically authorized by the regulatory author- <br />ity if geotechnical analysis demonstrates that a minimum safety factor <br />of 1.5 can be maintained. <br />(2) Topsoil or other materials suitable under 30 CFR 816.22 shall be <br />placed on all cut slopes of 1v:1.5h or flatter to aid in establishing <br />vegetation and to minimize erosion. Topsoil depth shall be adequate to <br />support vegetation necessary to control erosion. <br />(3) Temporary erosion-control measures shall be implemented during <br />construction to minimize sedimentation and erosion until permanent <br />control measures can be established. <br />Cut slopes will not exceed the above specified standards (See: <br />Figure 25, Existing Class I Road - Typical Sections, and Figure 26, <br />Proposed Class I Road - Typical Sections). During road construc- <br />tion, temporary sedimentation ponds, check dams, diversion ditches, <br />etc., will be constructed as required so that applicable water <br />quality standards are maintained throughout the construction period. <br />All cut slopes will be seeded and mulched to aid in establishing <br />vegetation and to minimize erosion. <br />816-182 <br />