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I <br /> 1. Perform compaction at such moisture content as is required to produce well-filled, dense, <br /> P q <br /> and firm material in place that will show no appreciable deflection or reaction under the <br /> compacting equipment. I <br /> 3.10 BEDDING <br /> A. All utility vaults,potable water pipe 4-inch nominal diameter and over, all steel pipe, all , <br /> concrete sewer pipe, all plastic pipe, all pipe under existing or future structures or roadways, <br /> and any and all utilities at a depth greater than 6 feet shall be laid in pipe bedding material. <br /> B. Unless otherwise noted in the Drawings,pipe or conduit of less than 4-inch diameter, <br /> outside structure lines and at a depth of less than 6 feet shall be bedded in native material <br /> properly shaped as specified below,all as detailed on the Drawings. I <br /> C. Compacted bedding material shall be placed the full width of the excavated trench to a depth <br /> as shown on the trench detail included in the Drawings. I <br /> 1. In lieu of a detail,the depth shall be 6 inches. <br /> D. Spread the bedding smoothly over entire width of trench to the proper grade so that the pipe I <br /> is uniformly supported along the barrel. <br /> E. Hand grade and compact each lift to provide a firm,unyielding surface along the entire pipe , <br /> length. For rigid pipe, compact to at least 90 percent relative compaction. <br /> F. Excavate bell holes at each joint to permit proper assembly and inspection of the joint. I <br /> G. Check grade and correct irregularities in bedding material. <br /> H. Center pipes horizontally in trench width. 111 <br /> 3.11 BACKFILLING <br /> A. Backfill trenches to contours and elevations with unfrozen fill materials. <br /> B. Systematically backfill to allow maximum time for natural settlement. Do not backfill over I <br /> porous,wet, frozen, or spongy subgrade surfaces. <br /> C. Maintain optimum moisture content of fill materials to attain required compaction density. I <br /> D. Place fill material, with the exception of CLSM, in continuous layers and compact in 6 to 8- <br /> inch lifts. I <br /> 1. Prevent pipe from moving either horizontally or vertically during placement and <br /> compaction of pipe zone material. <br /> 2. Where trenches are under existing or future structures,paved areas, road shoulders, <br /> driveways or sidewalks, or where designated on the Drawings or specified elsewhere in <br /> these specifications,the trench backfill shall be Class B or Class E and pipe zone backfill <br /> shall be Class B or Class E. Class B backfill shall be compacted to 95 percent of <br /> maximum density at optimum moisture content. <br /> Legion Golf Course Stormwater Detention Project Trenching 1 <br /> WO#UP3620 31 23 17 - 16 <br />