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ENGEO <br /> INCORPORATED <br /> IX. Biotecbnical Recommendations for Prevention and Mitigation of Existing or <br /> Potential Erosion Hazards <br /> Fill slopes on this project may be expected to be as erodible as the cut slopes in bedrock. <br /> Therefore, maintenance of vegetative cover following grading is especially important on all <br /> slopes. <br /> Vegetation provides a protective role on soil and exposed rock. It absorbs the impact of <br /> raindrops, reduces the velocity of runoff, and retards erosion. <br /> In many instances, adequate erosion protection for slopes can be accomplished solely with <br /> carefully selected and placed biological elements (plants) without the use of structures <br /> (e.g. brush layering and willow waddling). <br /> In other areas, biotechnical slope protection may involve the use of mechanical elements or <br /> structures in combination with biological elements to provide erosion control and help prevent <br /> small -scale slope failures. Locally, crib walls, welded -wire walls, gabion walls, rock walls, <br /> riprap, and reinforced earth walls used in combination with carefully selected and planted <br /> vegetation can provide high quality slope protection. The vegetation may be planted on the slope <br /> above a low retaining structure or toe wall, or the interstices of the structure can be planted. <br /> 4867.1.002.01 <br /> October 10, 2000 14 <br />