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Material containing, by volume, less than 25 percent of rock larger than 6 inches in greatest dimension will <br />be spread by scrapers or dozers in successive uniform layers not exceeding 12 inches in thickness before <br />compaction. <br />When the material for an embankment consists of large size rock, broken stone, or fragmented material that <br />makes placing it in 12 inch layers impossible, the embankment will be constructed in uniform layers not <br />exceeding in thickness the approximate average size of the rock used, but the layers will not exceed 36 <br />inches. Rock will be distributed by blading or dozing in a manner that will ensure proper placement in the <br />embankment, so that voids, packets and bridging wilt be reduced to a minimum. The final layer will meet the <br />requirements of Rule 4.03.2(3)(d)(iv). Each layer of the embankment will be completed, leveled and <br />compacted before the succeeding layer is placed. Successive layers will be compacted evenly by routing <br />dozers, trucks and scrapers over the entire width of the embankment. This procedure will be continued until <br />no visible horizontal movement of the embankment material is apparent. Embankment layers will be <br />compacted to a minimum of 90 percent of Standard Proctor density or as directed by the engineer to ensure <br />that the embankment is adequate to support the anticipated volume of traffic and weight and speed of <br />vehicles to be used. <br />Material wit( be placed in an embankment only when its moisture content is within acceptable levels to <br />achieve design compaction. <br />Temporary erosion control measures (ditches, berms, straw dikes, silt fence) will be utilized during <br />embankment construction to minimize sedimentation and erosion until permanent control measures can be <br />established. Immediately upon completion, measures will be taken to stabilize all embankments with <br />vegetation cover or other means as approved by the regulatory authority to minimize erosion. Where a <br />vegetation cover is used, consideration shall be given to providing an appropriate growth medium. <br />Drainaoe. Each access road not within areas disturbed by mining and reclamation activities will be <br />designed, constructed and maintained to have adequate drainage using ditches and culverts to safely <br />convey the peak runoff from a 10-year, 24-hour precipitation event while maintaining a minimum of one foot <br />of freeboard to the top of the road embankment (see Exhibit 13-f0 for typical details of road drainage <br />structures). <br />Drainage ditches will be placed at the toe of all cut slopes formed by the wnstmction of haul roads. Water <br />will be intercepted before reaching a large fill and drained safely away in accordance with the requirements <br />of Rule 4.03.1. Water from a fill will be released below the fill through conduits or in adequately lined <br />channels and will not be discharged onto the fill. <br />When road ditches discharge onto open terrain, a number of measures will be taken to protect the terrain <br />from erosion. SCC will utilize measures as revegetation, riprap, straw dikes, and silt fence to protect the <br />terrain from erosion. When the road ditch discharges onto an area disturbed by road construction, the <br />terrain will be revegetated or lined with riprap if necessary to control runoff. Temporary measures to <br />PR-05 33 Revised 01/06 <br />