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1 <br /> 3.02 REFILL <br /> A. If the material at the level of trench bottom consists of fine sand or sand and silt <br /> which may work into the drain rock prohibiting effective drainage, the sub-grade <br /> material shall be removed to the extent directed and the excavation refilled with <br /> coarse sand, or a mixture graded from coarse sand to fine pea-stone, to form a <br /> 1 filter layer preserving the voids in the gravel bed of the pipe. The composition and <br /> 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 /> 1 refill of excavation below grade. <br /> END OF SECTION <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 05/08 02223-2 05-4893 <br />