Oxygen, gaseous or liquid, shall not be manufactured in any Manufacturing District except when authorized by a special permit granted by the Board of Standards and Appeals in accordance with the provisions of Article VII, Chapter 3. Oxygen, gaseous or liquid, may be stored or utilized in all Manufacturing Districts in accordance with the provisions set forth in the Administrative Code and subject to the following limitations:

(a)        In M1 Districts

In M1 Districts, the total quantity of such oxygen stored shall not exceed 150,000 cubic feet at standard temperature and pressure.

(b)        In M2 Districts

In M2 Districts, the total quantity of such oxygen stored shall not exceed 500,000 cubic feet at standard temperature and pressure.

(c)        In M3 Districts

In M3 Districts, the total quantity of such oxygen stored is unlimited.