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gradation of gravel shall be approved by the Engineer prior to placement. Gravel <br /> shall be placed in 6 inch layers thoroughly compacted to 90 percent of maximum <br /> standard proctor density. If directed by the Engineer, drain rock shall be used for <br /> refill of excavation below grade. <br /> END OF SECTION <br /> 08/12 02223-2 11-4179 <br />