Specifications include, but are not limited to: SECTION 601 – PIPE 601.02 Materials. The following is added to this Subsection of the Standard Specifications: Corrugated High Density Polyethylene Drainage Pipe, Type S, shall conform to the requirements of Subsection 909.02.02. Perforated Corrugated High Density Drainage Pipe, type SP, shall conform to the requirements of Subsection 909.02.02. SECTION 909 DRAINAGE 909.02.02 HDPE Pipe. This Subsection of the Standard Specifications is changed to read as follows: Corrugated High Density Polyethylene Drainage Pipe, Type S, shall conform to the current requirements of AASHTO M-294, Type S Classification. Perforated Corrugated High Density Drainage Pipe, Type SP, shall conform to the current requirements of AASHTO M294, Type SP classification Pipes shall have a flush gasketed bell and spigot type joint incorporated into the pipe ends. If the pipe is to be perforated, the perforations shall extend 360º around the pipe.