Specifications include, but are not limited to: HDPE CULVERTS AND STORM DRAINS DESCRIPTION. The work shall consist of furnishing and delivering culverts and underdrains (as applicable) of the following type: High Density Polyethylene Pipe HDPE, (Corrugated) High Density Polyethylene Pipe, Type S (smooth lined) and Underdrains MATERIALS. a) Corrugated (High Density) Polyethylene Pipe and fittings shall conform to the latest revisions of AASHTO M 294, Type S or AASHTO M 252, Type SP as appropriate, Attachment B, and be approved for use by NH DOT. b) Connections for high density polyethylene pipe shall be of a bell and spigot type joint with an O-ring rubber gasket meeting ASTM F477 placed on the spigot end. At least two (2) corrugations of the spigot end must insert into the bell end. c) Pipe shall be supplied in 10’ and 20’ lengths. d) Marking. All pipe furnished shall be clearly marked in an approved manner with the name or trademark of the pipe fabricator
