173. On a Class B site, a tank must have an automatic leak detection system.
For the purposes of the first paragraph, the following sites are Class B sites:
(1) a site within 1,000 m measured horizontally from a water intake or from a well used for purposes other than those in subparagraph 1 of the fourth paragraph of section 168;
(2) a site within 50 m measured horizontally from a watercourse, lake, pond or any other comparable body of water or from an area subject to a 20-year flood event as indicated on the land use planning and development plans or in an interim control by-law adopted under the Act respecting land use planning and development (chapter A-19.1); and
(3) a site within 50 m but not more than 150 m measured horizontally from a subway station or tunnel, an underground public area or an underground parking garage.