B-1.1, r. 2 - Construction Code

Full text
8.166. The fuelling area referred to in section 8.165 must have a drainage system able to collect motor fuel in that area in the event of a leak or spill.
The drainage system must consist of a concrete apron having a minimum 1% slope away from the pump island, an oil separator and a drain connecting the apron and the separator.
The oil separator must be of a capacity sufficient to accept rainwater flow from the apron and flow from the motor fuel dispenser having the greatest flow.
O.C. 220-2007, s. 1.