These requirements cover primary carrier, secondary containment, integral primary/secondary containment, normal vent and vapour recovery, nonmetallic pipe, fittings, and systems (products) intended for use underground in the distribution of petroleum-base flammable and combustible liquids, alcohols, and alcohol-blended fuels as identified in this document. The products covered by these requirements are intended for installation and use in accordance with the regulations of the Authority Having Jurisdiction and the following documents: A) National Fire Code of Canada; B) CSA B139, Installation Code for Oil-Burning Equipment; and C) Environmental Code of Practice for Aboveground and Underground Storage Tank Systems Containing Petroleum and Allied Petroleum Products (CCME EPC-LST-61E). These requirements cover nonmetallic thermoplastic (flexible) and thermoset (rigid) plastic piping with manufacturer-supplied fittings for underground use only. The products covered by this document have been evaluated for assembly in normal soil applications by qualified persons in accordance with the manufacturer's instructions. The products covered by this document have not been evaluated for applications in sumps [more than 305 mm (12 in) from sump wall], as connector pipe (between underground pipe and dispensing device), aboveground or marine use, or other applications exceeding ambient temperatures of 23 degrees C (75 degrees F).