B-1.1, r. 2 - Construction Code

Full text
8.30. An underground tank must be installed
(1)  at least 1 m from the foundations of any building;
(2)  at least 1 m from any other tank;
(3)  at least 1 m from the property line;
(4)  at least 750 mm from the inner wall of the excavation; and
(5)  in such manner that the loads carried by the foundations or the supports of a building cannot be transmitted to the tank; in addition, the soil must not be removed from the footing down to the bed of the excavation, in a 45 ° slope.
O.C. 220-2007, s. 1.