A. Tanks shall be set on firm foundations. Tanks located inside buildings and exceeding two thousand five hundred (2,500) gallon capacity shall be supported independently on the floor construction. Outside aboveground tanks more than one foot (1') above the ground shall have foundations and supports of masonry or protected steel, except that wooden cushions may be used.
B. No combustible materials shall be permitted under or within ten feet (10') of any outside aboveground storage tank. Electric motors, unless of approved explosion proof type, and internal combustion engines shall not be placed beneath tanks or elsewhere within the line of vapor travel. (1961 Code)