5706.4.5.9 Mounded-over tanks.

Mounded-over tanks shall be considered underground tanks. A mounded-over tank may be erected with its base at any desired elevation not higher than the grade plane of the premises. It shall be enclosed with a steel, reinforced-concrete, or closed-face-concrete cribbing wall extending from the established grade to the top of the top cover, with the exterior face of the wall at least 10 feet (3048 mm) from the exterior face of the wall of the tank, and backfilled between the tank and the enclosing wall with compacted clean earth or sand containing no ash or other corrosive substance. The wall and backfill may be replaced with compacted similar fill, extending from the established grade to the level of the top cover on the tank, at the normal angle of repose of the material so used, with the provision that the width of the sloped material at the level of the top of the top cover shall be at least 10 feet (3048 mm) wide. When two or more mounded-over tanks, either rectangular or vertical-cylindrical, are grouped together, the tanks shall be at least 1 foot (305 mm) apart from each other, and the group of tanks shall be enclosed around the periphery with the same type of wall and backfill described above for one mounded-over tank.

5706.4.5.10 Maximum capacity of flammable liquid underground tanks.

Underground storage tanks used for storage of a flammable liquid shall not exceed 500,000 gallons (1892 500 L), except that the commissioner may approve the installation of underground tanks with a capacity not to exceed 6,000,000 gallons (22710 000 L) where such greater capacity is determined to be necessary because of the capacity of the marine vessel, watercraft, pipeline or tank car delivering such liquid and where such increased capacity does not endanger the public safety.

5706.4.5.11 Maximum capacity of combustible liquid underground tanks.

Underground storage tanks used for storage of a combustible liquid shall not exceed 6,000,000 gallons (22 710 000 L). Such tanks may be compartmented; however, in no case shall any compartment exceed 4,000,000 gallons (15 140 000 L).

5706.4.6 Overfill protection.

To prevent an overfill during the transfer of flammable or combustible liquid from a marine vessel, watercraft, pipeline, tank car, cargo tank or storage tank, each tank shall be equipped with an approved electrically operated overfill protection system. Such system shall be in accordance with API 2350.