B-1.1, r. 3 - Safety Code

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143. The owner must water dip each underground motor fuel tank every week.
The owner must also test for the presence of a petroleum product or vapours of such a product in the observation well if the tank does not have a continuous monitoring system with an alarm and, if applicable, conduct a leak detection test of the underground tank and piping that meets the requirements of the second paragraph of section 8.130 of Chapter VIII of the Construction Code (chapter B-1.1, r. 2).
If the leak detection test indicates a leak, all defective components in the installation must be repaired or replaced and another leak detection test must be conducted.
O.C. 221-2007, s. 1.