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E. Removal of Unstable Material: 1. It is the intent of this specification that all pipe and other structures shall be provided with a stable foundation, and that any material, which by reason of kind or condition is not and cannot be made stable by drainage or compaction, shall be removed or replaced. Therefore, any material encountered at the elevation shown on the drawings or specified for pipe that will not or cannot be improved to provide a stable foundation for the pipe, shall be removed and replaced. All unstable material below the grade line of the pipe shall be removed for the full width of the trench and replaced with suitable selected material, compacted as specified elsewhere in these specifications. For the purpose of this specification, muck, peat and other highly organic soils shall be considered to be unstable materials. Also, any soil which is or might become wet to such a degree that its moisture content is equal to or greater than 90 percent of its liquid limit will have to be specifically approved by the ENGINEER with regard to stability, or shall be considered to be an unstable material requiring removal and replacement. 3.02 PIPE TRENCH EXCAVATION A. Trenches for pipe culverts and for storm sewers shall be excavated to the required depth and to a width sufficient to provide adequate working room. For pipe lines placed above the natural ground line the embankment shall be placed and compacted, prior to excavation of the trench, to an elevation at least two feet above the top of the pipe and to a width equal to four pipe diameters, and the trench then excavated to the required grade. Where the soils permit, the trench sides shall be vertical up to at least the mid-point of the pipe. B. Work shall be performed in compliance with applicable Trench Safety Standards identified in the Occupational Safety and Health Administration's Excavation Safety Standards (OSHA), 29 C.F.R.S. 1926.650 Subpart P will be adhered to during trench excavation in accordance with Florida Statutes 553.60 through 533.64 inclusive (1990), "Trench Safety Act". C. For all pipe culverts and storm sewers 24 inches or over in diameter (except side drain), the bedding shall be shaped to conform to the outside of the pipe, for a depth of not less than 10 percent of its total height (outside dimensions) and recesses provided to receive the bell. D. Where wet conditions are such that dewatering by normal pumping methods, including wellpointing, would not be effective, then this requirement may be modified by the ENGINEER. No payment will be allowed for select bedding material, which might be utilized by the CONTRACTOR for his own convenience in lieu of dewatering. City of Sunny Isles Beach NE 174th Street Roadway Improvements 02630 - 12 Storm Drainage 14-1758 / 09-19-2014