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The Engineer shall be the judge of whether a pipe is ser- <br /> 1 iously damaged and any pipe so classfied shall be permanently <br /> removed from the site of the work . <br /> The inside of all pipes and couplings shall be free from <br /> dirt , grease , or other deleterious materials . The open ends of <br /> all pipe previously laid shall be adequately plugged water tight <br /> whenever pipe laying operations are suspended at the end of each <br /> work day , or for any other reason . <br /> Select material shall be placed and thoroughly <br /> compacted across the bottom of the trench to provide full support <br /> of all the pipe . Bells and/or couplings shall have soil removed <br /> to provide a uniform bearing . <br /> In joining asbestos cement pipe , a thin coating of non-toxic <br /> and water soluble lubricant shall be applied to the entering <br /> level and back to the first machined shoulder of the pipe to be <br /> coupled . The rubber rings shall be set in the coupling grooves , <br /> and the couplings shall be placed between the pipe ends . The <br /> pipe shall be moved so that ends butt snugly against the rubber <br /> rings . <br /> All connections to existing lines shall be flanged by fittings <br /> with isolation plates . <br /> i <br /> 76-1 . 03A4 Backfilling - Backfilling shall not be completed <br /> until the pipe has been properly installed to the satisfaction of <br /> the Engineer . <br /> Backfill materials shall be placed on both sides of the pipe <br /> simultaneously to prevent any undue strain on the pipe . <br /> Selected excavated material shall be placed by hand in the <br /> trench in six (6 ) inch layers to a depth of twelve (12 ) inches <br /> above the pipe and shall be compacted to not less than 85 percent <br /> relative compaction . <br /> The balance of the trench shall be backfilled and compacted as <br /> shown on Standard Nos . A-7 . Compacting equipment or methods that may <br /> damage the pipe or cause excessive displacement shall not be used. <br /> All pipe damaged during construction operations shall be <br /> replaced by the contractor at his expense to the satisfaction of <br /> the Engineer . <br /> 76-1 . 03A5 Trench Resurfacing - Trenches in existing streets <br /> shall be resurfaced with the type of thickness of bases , surfacing <br /> or pavement shown on the plans and/or Standard No . A-7 . <br /> III 76-7 <br /> i <br />