B-1.1, r. 2 - Construction Code

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8.64. A contractor or owner-builder may not install a tank used to store a Class 1 petroleum product, except if access to the roof of the tank and to the shut-off valve controls is situated higher than the height of the dike if
(1)  the height of the dike exceeds 3.5 m; or
(2)  the distance between the tank and the top inside edge of the dike wall is lower than the height of the dike.
O.C. 220-2007, s. 1.