B-1.1, r. 2 - Construction Code

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8.152. The pit for a submersible pump or the piping of a submersible pump in a motor fuel dispensing outlet must be enclosed in a liquid-tight casing resistant to petroleum products. The casing must also be covered and installed in such a manner as to prevent external loads being transmitted to the tank or piping.
The pit must be large enough to enable the pump to be inspected and serviced.
O.C. 220-2007, s. 1.