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• 2.05.3 • 1~ TR-27 /~~PRoVED 80~-103 When rock or rocky material is used for embankment, placement shall be in layers not exceeding the maximum size of the rock present, and in no case shall lifts exceed 30 inches in depth. Rock layers shall be compacted by routing the spreading equipment and loaded hauling equipment over the entire width of the fill until compaction is obtained. Temporary erosion control measures will be implemented during the construction of the haul roads. Straw bales or other alternative sedimentation control devices will be placed along the edge of the embankments. After construction is complete the area disturbed will be seeded and mulched to reduce the rate and volume of run-off. A typical haul road section is shown on Map HR-1, Haul Road Sections, presented in Volume V. Maps 52-1-011 through 52-1-014, presented in Volume V, show plan and profile views of this haul road segment. Drainage The drainage design for the haul road includes ditches, ditch relief drains and culverts as shown on the Drainage Plans, Maps 21-1 and 21-2. Volume III, Exhibit 8, Protection of the Hydrologic Balance, presents the run-off calculations based on the 10-year, 24-hour precipitation event. The ditch and culvert sizes are presented in Exhibit 8 and on Maps 22-B, 22-C, 22-J and 22-K. Culverts are designed in accordance with the Handbook of Steel Drainage & Highway Construction Products (1983). According to table HC-1, page 126, the minimum depth of cover for corrugated steel pipe, H-20 live load, 2 2/3 X 1/2 inch corrugations is 12-inches for diameters or spans of 12 to 96 inches. The depth of cover is measured from the top of pipe to the top of subgrade. Therefore all culverts will be covered by compacted fill to a minimum depth of 1 foot. The inlet end of all culverts will be protected by an end section or a rock or concrete headwall. 2.05 - 21 - 8/03