B-1.1, r. 2 - Construction Code

Full text
8.68. A contractor or owner-builder may not demolish a tank unless the tank has been
(1)  cleaned of any petroleum product residue; and
(2)  purged of any vapour while ensuring that, during the demolition operation, the concentration of vapours is less than 10% of the lower explosive limit at all times.
The work must be carried out in such a manner as to render the tank unusable and to prevent any accumulation of flammable vapours. The work must in addition be carried out in a safe location where the public has no access, using the equipment necessary to recover all petroleum product residue; that location must also comply with the planning by-laws in force in the territory of the municipality where the work is carried out.
A contractor or owner-builder must in addition place petroleum product residue in a tank or other closed container compatible with petroleum products. The residue and materials from the dismantling must be shipped to a site authorized under the Environment Quality Act (chapter Q-2).
O.C. 220-2007, s. 1.