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the pipe, and the bottom shall be shaped to fit the pipe to a point six inches above the bottom of the pipe. Such bedding material shall be coarse sand, washed limerock or other suitable granular material. Where bell and spigot pipe is used, the bell holes shall be deep enough to ensure that the bell does not bear on the bottom of the excavation, and shall not be excessively wide in the longitudinal direction of the culvert or storm drain. 3.05 COMPACTION A. When a pipe trench is undercut in order to remove unsuitable material or for other reasons, it shall be brought to required grade using suitable materials, after which the bottom shall be compacted to match approximately the density of the soil in which the trench was cut. 3.06 PIPELAYING A. As pipe laying progresses, the interior of the pipe shall be cleaned of all dirt and superfluous materials. The CONTRACTOR shall, at all times, take whatever measures are necessary to prevent the entrance of dirt and other foreign matter into the storm sewer system. In the event that it is necessary to clean the pipe before final acceptance, the CONTRACTOR shall do so without additional compensation. B. Open Trench - No more than 200 linear feet, or the length of trench between consecutive drainage structures, shall be left open behind pipe laying, whichever distance is greater. In no instance shall any trench be left open for more than 24 hours before backfilling in accordance with these specifications. 3.07 DEWATERING A. The CONTRACTOR shall provide adequate equipment for the removal of storm or subsurface waters that may accumulate in the excavation. If subsurface water is encountered, the CONTRACTOR shall utilize suitable equipment to adequately dewater the excavation so that it will be dry for work and pipelaying. A wellpoint system or other ENGINEER approved dewatering method shall be utilized, if necessary, to maintain the excavation in a dry condition for preparation of the trench bottom and for pipe laying. Dewatering by trench pumping will not be permitted if migration of fine-grained natural material from bottom, sidewalls or bedding material will occur. In the event that satisfactory dewatering cannot be accomplished due to subsurface conditions or where dewatering could damage existing structures, the CONTRACTOR shall obtain the ENGINEER’s approval of wet trench construction procedure before commencing construction. Dewatering shall cease in a manner to allow the subsurface water to slowly return to normal levels. City of Sunny Isles Beach NE 174th Street Roadway Improvements 02630 - 14 Storm Drainage 14-1758 / 09-19-2014