Flammable Liquids Bulk Storage Regulations (C.R.C., c. 1148)

57 (1) Storage tanks installed on ground which drains toward railway tracks, rights-of-way, adjacent waters, sewers, or congested areas shall be protected by suitable dikes.

(2) Storage tanks containing crude petroleum shall be diked where railway or adjacent private property would be exposed in the event of a boil-over of the liquid.

(3) Dikes for Class I or Class II liquids shall have a net capacity not less than the capacity of the largest storage tank plus 10 per cent of the aggregate capacity of all other storage tanks in the diked area.

(4) Dikes for crude petroleum shall have a net capacity not less than the capacity of all the storage tanks in the diked area. The dikes shall be provided with flareback sections at the top of the dike designed to turn back a boil-over wave. These flareback sections shall not be required for dikes enclosing approved floating roof storage tanks, or when storage tanks are provided with approved attached extinguishing systems.

(5) No dike enclosing crude petroleum storage tanks shall include storage tanks containing Class I or Class II flammable liquids.

(6) Provision may be made for draining water from diked areas if the area where the piping passes through the dikes is protected from seepage by flanges or other suitable means.