B-1.1, r. 3 - Safety Code

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176. An owner who ceases to remove petroleum products from an underground tank for a period of 180 days or more but less than 2 years must
(1)  empty the tanks, piping, motor fuel dispensers and pumps of Class 1 petroleum products and, if calculations confirm that the groundwater may lift a tank, the owner must fill the tank with a petroleum product other than a Class 1 product;
(2)  lock the fill and gauge pipe caps and covers and motor fuel dispensers and lock the main electrical control; and
(3)  gauge each tank containing a petroleum product every month.
O.C. 221-2007, s. 1.