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The thickness of the riprap layer should be at least 1.5 times the d5o dimension. Standard <br /> construction practices, including base preparation and well graded base material should be <br /> followed. Documentation for these computation is attached. <br /> Sincerely, <br /> L/� /C . e)�l <br /> Don R. May P.E. <br /> Project Engineer <br /> 735 E. 7th Ave <br /> Durango, CO 81301 <br /> p.c. Brad Gosche <br /> Caryl Helmin <br />