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2.05.3 <br />shall lifts exceed 30 inches in depth. Rock layers shall be compacted by <br />routing the spreading equipment and loaded hauling equipment over the <br />entire width of the fill until compaction is obtained. <br />Temporary erosion control measures will be implemented during the <br />construction of the haul roads. Straw bales or other alternative <br />sedimentation control devices will be placed along the edge of the <br />embankments. Immediately after construction is complete the area <br />disturbed will be seeded and mulched to promote a reduction in the rate and <br />volume of run-off. <br />A typical haul road section is shown on Map HR-1, Haul Road Sections, <br />presented in Volume V. Maps 52-1-011 through 52-1-014, presented in <br />Volume V, show plan and profile views of this haul road segment. <br />Drainage <br />The drainage design for the haul road includes ditches, ditch relief drains <br />and culverts as shown on the Drainage Plans, Maps 21-1 and 21-2. Volume <br />III, Exhibit 8, Protection of the Hydrologic Balance, presents the run-off <br />calculations based on the 10-year, 24-hour precipitation event. The ditch <br />and culvert sizes are presented in Exhibit 8 and on Maps 22-B, 22-C, 22-J <br />and 22-K. <br />Culverts are designed in accordance with the Handbook of Steel Drainage <br />& Highway Construction Products (1983). According to table HC-1, page <br />126, the minimum depth of cover for corrugated steel pipe, H-20 live load, 2 <br />2/3 X 1/2 inch corrugations is 12-inches for diameters or spans of 12 to 96 <br />inches. The depth of cover is measured from the top of pipe to the top of <br />subgrade. Therefore all culverts will be covered by compacted fill to a <br />minimum depth of 1 foot. <br />The inlet end of all culverts will be protected by an end section or a rock or <br />concrete headwall. <br />C~ <br />PR-O6 2.05 - 21 - 12/01 <br />A P PRovE.D <br />I /I s~a 2 <br />