Q-2, r. 4.1 - Clean Air Regulation

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44. Every above-ground tank of a capacity equal to or greater than 4 m3 that is used to store volatile organic compounds that have a vapor pressure under storage conditions equal to or greater than 10 kPa must have a submerged fill pipe.
This section applies to existing above-ground tanks as of the date of the first repair that requires degassing or not later than 31 December 2011, whichever is earlier.
O.C. 501-2011, s. 44.