(c) for underground tanks that are double containment linings, ULC/ORD-C58.4, Double Containment Fibre Reinforced Plastic Linings for Flammable and Combustible Liquid Storage Tanks.
c) pour tout réservoir souterrain conçu comme un revêtement intérieur double, la norme ULC/ORD-C58.4 intitulée Double Containment Fibre Reinforced Plastic Linings for Flammable and Combustible Liquid Storage Tanks.