(a) Underground tanks outside buildings used for the storage of flammable liquid shall conform to the provisions of this section.
(b) Individual underground tanks for flammable liquid located outside of buildings shall not exceed thirty thousand (30,000) gallon capacity.
(c) The distance from any underground tank outside buildings to a lot line or a building shall be not less than three (3) feet.
(d) No underground tank for liquid with flash point of one hundred degrees Fahrenheit (100°F) or less shall be installed under any street, alley or other public thoroughfare.
(e) The shells of underground storage tanks for Class I or Class II flammable liquid shall be located not less than three (3) feet horizontally from the nearest outside wall of any basement, pit or cellar with floor lower in elevation than the top of such tank, except that a lesser distance may be approved when the tank is enclosed, encased or otherwise protected against injury in an approved manner. Where deemed necessary by the Division of Fire to provide a means of guarding against leakage, tanks for such liquids shall be encircled by a line of open-jointed or perforated drainage tile laid in an approved manner in porous material at a level below the lowest adjoining tank, with inspection wells extending from the drainage tile to the grade level, where directed by the Division. Such inspection wells shall have tight-fitting, easily removable plugs or caps at the grade level.
(f) The distance between underground tanks shall be not less than two (2) feet.
(g) Tanks buried underground outside buildings shall have the top of the tank below the level of any piping to which the tanks may be connected and not less than three (3) feet below the surface of the ground, except that:
(1) In lieu of three (3) feet earth cover, tanks may be buried under twenty-four (24) inches of earth plus a slab of reinforced concrete not less than six (6) inches in thickness extending at least one (1) foot beyond the shell of the tank in all directions.
(2) When tanks are buried under driveways, the total coverage shall be not less than three (3) feet when the uppermost six (6) inches of such coverage is reinforced concrete extending at least one (1) foot beyond the shell of the tanks in all directions, and four (4) feet total coverage in other cases.
(h) Where a tank located outside of buildings cannot be entirely buried, it shall be covered over with earth to a depth of at least three (3) feet. Any sloped surfaces of earth cover shall not be steeper than the angle of repose of the cover material.
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)