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F. The remainder of the trench above the compacted backfill, as just described above, shall be filled and thoroughly compacted with common fill by rolling, ramming, or puddling, as the Engineer may direct. Compact common fill in 12 -inch layers to 95% maximum density. G. The bedding rock in muck areas shall consist of the at least 10 inches of washed and grade limerock placed in the trench to the proposed elevation of the centerline of the pipe prior to any pipe laying. This ' bedding shall not be used under any circumstances as a drain for ground water. The Contractor shall take all precautions necessary to maintain the bedding in a compacted state and to prevent washing, erosion or loosening of this bed. H. In locations where pipes pass through building walls, the Contractor ' shall take the following precautions to consolidate the refill up to an elevation of at least 1 foot above the bottom of the pipes: 1. Place structural fill in such areas for a distance of not less than 3 feet either side of the centerline of the pipe in level layers not exceeding 6- inches in depth. 2. Wet each layer to the extent directed and thoroughly compact ' each layer with a power tamper to the satisfaction of the Engineer. ' 3.05 GRADING 1 07/03 02221 -6 03- 4138.A A. Backfilling over pipes shall begin as soon as practical after the pipe has been laid, jointed, and inspected and the trench filled with suitable compacted material to the mid - diameter of the pipe. B. Backfilling over ducts shall begin not less than three days after placing ' concrete encasement. C. All backfilling shall be prosecuted expeditiously as detailed on the Drawings. D. Any space remaining between the pipe and sides of the trench shall be packed full by hand shovel with selected earth, from stones having a diameter greater than 2- inches and thoroughly compacted with a tamper as fast as placed, up to a level of one foot above the top of tpipe. Compact to 95% maximum density in layers not to exceed 4 inches up to the centerline of the pipe from the trench bottom and in layers not to exceed 6 inches from the pipe centerline to 12 inches above the pipe. ' E. The filling shall be carried up evenly on both sides with at least one tamping for into the trench. man each man shoveling material F. The remainder of the trench above the compacted backfill, as just described above, shall be filled and thoroughly compacted with common fill by rolling, ramming, or puddling, as the Engineer may direct. Compact common fill in 12 -inch layers to 95% maximum density. G. The bedding rock in muck areas shall consist of the at least 10 inches of washed and grade limerock placed in the trench to the proposed elevation of the centerline of the pipe prior to any pipe laying. This ' bedding shall not be used under any circumstances as a drain for ground water. The Contractor shall take all precautions necessary to maintain the bedding in a compacted state and to prevent washing, erosion or loosening of this bed. H. In locations where pipes pass through building walls, the Contractor ' shall take the following precautions to consolidate the refill up to an elevation of at least 1 foot above the bottom of the pipes: 1. Place structural fill in such areas for a distance of not less than 3 feet either side of the centerline of the pipe in level layers not exceeding 6- inches in depth. 2. Wet each layer to the extent directed and thoroughly compact ' each layer with a power tamper to the satisfaction of the Engineer. ' 3.05 GRADING 1 07/03 02221 -6 03- 4138.A