Headwall

1 1 Each The total length of this structure shall be 70 LF of 72” diameter, 10 gauge, 3” x 1” corrugation, aluminum pipe fully welded on a 38 degree skew to 31’-6” wide x 13’-3” high, 0.200’ metal thickness, aluminum structural plate headwall on inlet end and 31’-6” wide x 14’-0” high, 0.200” metal thickness, aluminum structural plate headwall on outlet ends per attached rawing. The 72” diameter pipe is to have 0.25” thick aluminum flanged joints fully welded to the ends of the pipe and shall include neoprene gasket and bolts/nuts, includes: three (3) – 1’-0” high internal baffles fully welded inside pipe, one (1) roll of TX Geogrid, all headwall cap, wall support members, and tie back rods with deadman anchors per attached drawing, PE stamped drawings and headwall calculations and manufacture field representative on site to assist with installation of flanged joints and backfill of pipe and headwalls. Aluminum structural plate headwalls on both inlet and outlet side of the pipe are designed for surcharge. Reference attached drawing. All structure materials and incidentals shall be designed and fabricated to meet or exceed AASHTO material requirements for aluminum box Culvert. AASHTO HL-93 loading and North Carolina Department of Transportation Standard Specifications. The headwalls shall be designed for surcharge. The purchase of this structure shall include but limited to all items specified in this specification, the delivery of the structure and any incidentals required for the proper assembly of the structure.

Division 31 -	Earthwork, Erosion and Sedimentation Controls.
Division 33 -	Utilities, Storm Drainage Utilities, Ponds and Reservoirs.
Division 35 -	Waterway and Marine Construction, Shoreline Protection, Waterway Construction and Equipment.