8.29. An underground tank must, to be installed,1° have a double wall and a capacity of more than 110,000 litres;
2° have, in its interstitial space, an automatic leak detection system with a visual and audible alarm manufactured under the requirements of CAN/ULCS675.1, Standard for Volumetric Leak Detection Devices for Underground and Aboveground Storage Tanks for Flammable and Combustible Liquids or CAN/ULCS675.2, 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;
3° 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%; and
4° have any damage repaired, before the tank is backfilled, according to the manufacturer’s specifications.