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2.05.3 <br />When rock or rocky material is used for embankment, placement shall be in <br />layers not exceeding the maximum size of the rock present, and in no case <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. After construction is complete the area disturbed will be <br />seeded and mulched to reduce the rate and volume of run-off. <br />Drainage <br />The drainage design for the haul road includes ditches and culverts as <br />shown on Figure 2.2-3. <br />Culverts are designed in accordance with the Handbook of Steel Drainage & <br />Highway Construction Products (1983). According to table HC -1, page 126, <br />the minimum depth of cover for corrugated steel pipe, H-20 live load, 2 2/3 X <br />1/2 inch corrugations is 12 -inches for diameters or spans of 12 to 96 inches. <br />The depth of cover is measured from the top of pipe to the top of subgrade. <br />Therefore all culverts will be covered by compacted fill to a minimum depth of <br />1 foot. <br />The inlet end of all culverts will be protected by an end section or a rock or <br />concrete headwall as required by DRMS. <br />Reclamation of the haul road will involve returning the road to pre -mining <br />contours. The road will be returned to its relative flat configuration as shown <br />on Figure 3.1-1 Reclamation Map. <br />A discussion of the light use roads in the permit area follows: <br />Light Use Roads <br />New and existing light use roads are or will be located on ridges or on the <br />most stable available slopes. <br />PR -02 2.05-15- 10/12 <br />