Specifications include, but are not limited to: Supplier must provide all necessary hardware, wale beams, caps, continuous flat gaskets, galvanized steel tieback rods with dead man anchor plates, Anchors, lugs, inserts, adjustable turnbuckles and all other materials necessary to complete project. All hardware to be hot dip galvanized. A. Bidder shall be required to supply materials that meet or exceed current NCDOT specifications. B. Pipe shall be fully welded inside and out to headwalls using two root welds and two finish welds on either side of the wall. All finish welds are shall be ground to a smooth finish. C. Headwall and pipe shall be reinforced per AASHTO specifications and structural engineer's requirements. D. The continuous flat gasket shall be 3/8” thick x 2FT wide and made of closed cell neoprene rubber which upon assembly provides a watertight seal. E. Pipe sections and bands shall be assembled and alphanumerically / alignment match-marked at the plant site before shipping to verify fit. F. Bands shall be installed onto the pipe sections prior to shipping. Safety bracing shall be included to eliminate tipping or falling of the headwall during assembly. G. Pipe manufacturer must provide certification of the measured dimensions of the pipe, bands and the continuous flat gaskets. Certification must state that the bands and the gaskets have been pre-fitted and will securely tighten around the supplied pipe. Certification of the dimensions must be signed by the manufacturer’s representative and dated.