A. It shall be unlawful for any person to use or cause to be used, or to maintain or cause to be maintained, any surface storage tank or containers located outside of any building, and in which flammable liquids, petroleum or its liquid byproducts, or liquified petroleum gases are, or may be, placed or stored, unless such surface storage tank or container is surrounded by masonry, or reinforced concrete walls or dikes so designed, constructed and maintained as to confine the total capacity of the largest tank or container within the same and 10% of the capacity of such other tanks and containers as are located within the same.
1. Such walls or dikes shall be increased for each additional tank or container of smaller capacity located within the same by 10% of the capacity of such additional tank or container.
2. Provided, however, that such walls, or dikes shall not be required for tanks of less than 2,000 gallons capacity, tanks in isolated locations, tanks located in absorption plants, tanks containing liquids used in conjunction with orchard heating which will flash at a temperature in excess of 100° F and not more than 187° or tanks containing liquified petroleum gases, except where in the opinion of the Fire Chief a hazardous condition exists.
B. Any surface storage tank or container located inside of any building and in which flammable liquids are, or may be, placed or stored shall be surrounded by masonry or reinforced concrete walls or dikes so designed, constructed, and maintained as to confine the total capacity of all such tanks or containers within the same.