1.1 This specification covers requirements and test methods for workmanship, flattening, dimensions, tolerances, stiffness, perforations, environmental stress cracking, bonding, and impact resistance for smoothwall perforated and nonperforated polyethy This specification covers smoothwall perforated and nonperforated polyethylene (PE) pipe for use in drainage and waste disposal absorption fields. It covers requirements and test methods for workmanship, flattening, dimensions, tolerances, stiffness, p