Specifications include, but are not limited to: Pipe Requirements: ADS N-12 ST IB pipe (per AASHTO) shall have smooth interior and annular exterior corrugations. 6-inch through 10-inch (150mm to 250mm) shall meet AASHTO M252, Type S or SP. 12-inch through 48-inch (300mm to 1200mm) shall meet AASHTO M294, Type S or SP or ASTM F2306. Mannings “N” value for use in design shall be 0.012. Joint Performance: Pipe shall be joined using a bell and spigot joint meeting AASHTO M252, AASHTO M294 or ASTM F2306. The joint shall be soil-tight and gaskets shall meet the requirements of ASTM F477 (See Diagram 1). Gaskets shall be installed by the pipe manufacturer and covered with a removable wrap to insure the gasket is free from debris. A joint lubricant supplied by the manufacturer shall be used on the gasket and bell during assembly. Fittings: Fittings shall conform to AASHTO M252, AASHTO M294 and ASTM F2306. Bell and spigot connections shall utilize a spun-on or welded bell and valley or saddle gasket meeting the soil-tight joint performance requirements of AASHTO M252, AASHTO M294 or ASTM F2306. Material Properties: Virgin material for Pipe and fitting production shall be high density polyethylene conforming with minimum requirements of cell classification 424420C for 6-inch through 10-inch (150-250mm) diameters, or 435400C for 12-inch through 48-inch (300- 1200mm) diameters, as defined and described in the latest version of ASTM D3350, except that carbon black content should not exceed 4%. The 12 –through 48-inch (300mm – 1200mm) virgin pipe material shall comply with the notched constant ligament-stress (NCLS)test as specified in Sections 9.5 and 5.1 of AASHTO M294and ASTM F2306, respectively.