172. On a Class A site, as defined in section 168, the tank must have a double wall.
The double wall must have, in its interstitial space, an automatic leak detection system with a visual and audible alarm that meets the requirements of CAN/ULC-S675.1, Standard for Volumetric Leak Detection Devices for Underground and Aboveground Storage Tanks for Flammable and Combustible Liquids or CAN/ULC-S675.2, Standard for Nonvolumetric Precision Leak Detection Devices for Underground and Aboveground Storage Tanks and Piping for Flammable and Combustible Liquids, published by Underwriters’ Laboratories of Canada.
The double wall must also contain, in its interstitial space, where applicable, brine composed exclusively of calcium chloride with or without potassium chloride or sodium chloride where the respective concentration does not exceed 42%, 3% and 2%.
O.C. 221-2007, s. 1; O.C. 88-2018, s. 1812.