2012-03-07_PERMIT FILE - C2010088 (24)

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tiNlA17 ; pAGiE1C'' All backfilling material placed around and adjacent to pipe culverts and to a point at least one foot above the top of the pipe culvert shall consist of sand, gravel, sandy clay, or a combination thereof, free from all vegetation and rock or lumps greater than one and one -half inches (1 -1/2 ") diameter in their greatest dimension. Granular material containing a small amount of silt or clay is an ideal backfill material because it makes a dense, stable fill. Where granular material is used for backfill, the ends of the pipe culvert embankment shall be sealed with well tamped clay to prevent leaking and infiltration of water along the pipe culvert. Materials used to complete the embankment over the pipe culvert should be essentially the same as the materials used for the pipe culvert backfill and should be placed and compacted in the same manner as pipe culvert backfill materials are placed. Such material must be used to complete the embankment at least to a height over the top of the pipe culvert equal to the nominal diameter of the pipe culvert, or if the height of the completed embankment over the top of the pipe culvert is less than the nominal diameter of the pipe culvert, then such material must be used to complete the embankment. The pipe culvert must be protected from damage during the entire construction period, especially if heavy compaction and /or construction equipment is used. heavy equipment shall not be operated over the pipe culvert until it has been covered with compacted backfill material to a depth of twenty four inches (24 "). Copies of all compaction tests shall be supplied to the Engineer. 8.21.11 RETIGHTENING OF BOLTS - As soon as possible after completion of the embankment over corrugated structural plate pipes, all bolts in the corrugated structural pipe must be retightened to the standards set forth in Section 8.21.08 above. Such retightening must be started at one end of the pipe culvert and all bolts must be tightened progressively through the length of the pipe culvert. 8.21.12 REMOVAL OF EXISTING HEADWALLS OR CULVERTS IN PREPARATION FOR EXTENSION OF EXISTING PIPE CULVERTS - The Industry shall remove existing headwalls and /or culverts in whole or in part as shown on the Drawings and in the Specifications. The Industry shall perform all work called for, as shown on the Drawings and in the Specifications, which may be necessary to adapt existing pipe culverts for extension or reconstruction, including required excavation and backfilling. Except as otherwise provided for in these Specifications, the Industry will determine the method of extending existing pipe culvert structures by consulting with the Engineer. See also Section 8.21.04. 8.22.00 CULVERTS - REINFORCED CONCRETE PIPE (RCP) These pipe culvert specifications cover the fabrication and installation of: a) Round reinforced concrete pipes b) Reinforced concrete manhole riser c) Reinforced concrete flared end pipes Each of which will be referred to as "pipe culverts ". Pipe culverts may be for culverts, siphons, drains, and conduits as shown on the Plans or directed by the Engineer in accordance with these 35