406.7.3 Storage tanks.

Motor fuel storage tanks shall be installed below ground, except as authorized by the rules of the Fire Department. The installation and venting of storage tanks shall be in accordance with the rules of the Fire Department and the requirements of the New York City Fire Code. Storage tanks installed below ground shall comply with the following:

   1.   The top of the storage tanks shall be at least 24 inches (below finished grade and at least 24 inches (610 mm) below the level of any cellar or basement floor within 10 feet (3048 mm) of the tanks.

   2.   Storage tanks shall be located so that the forces from any building foundation and support loads are not transmitted to the tanks. The distance from any part of a storage tank to the nearest wall of any basement, pit or cellar, or from any property line that may be built upon, shall not be less than 36 inches (914 mm).

   3.   Storage tanks shall be covered with a structurally supported reinforced concrete slab at least 8 inches (203 mm) thick, extending at least 12 inches (305 mm) beyond the horizontal outlines of the storage tanks, and placed over a cover of suitable clean backfill material. Such slab shall be designed and reinforced in accordance with ACI 318. All concrete shall have a minimum compressive strength of 4,000 pounds per square inch (27 580 kPa) at 28 days.

   4.   Storage tanks shall be placed on a 12-inch (305 mm) thick concrete base slab or installed in such other manner, secured against flotation, and approved by the department.

406.8 Repair garages.

Repair garages shall be constructed in accordance with the New York City Fire Code and Sections 406.8.1 through 406.8.6 of this code. This occupancy shall not include motor fuel-dispensing facilities, as regulated in Section 406.7.

406.8.1 Mixed uses.

Mixed uses shall be allowed in the same building as a repair garage subject to the provisions of Section 508.1.

406.8.2 Ventilation.

Repair garages shall be mechanically ventilated in accordance with the New York City Mechanical Code. The ventilation system shall be controlled at the entrance to the garage.

406.8.3 Floor surface.

Repair garage floors shall be of concrete or similar noncombustible and nonabsorbent materials.

   Exception: Slip-resistant, nonabsorbent, interior floor finishes having a critical radiant flux not more than 0.45 W/cm 2 , as determined by NFPA 253, shall be permitted.

406.8.4 Heating equipment.

Heating equipment shall be installed in accordance with the New York City Mechanical Code.

406.8.5 Gas detection system.

Repair garages used for the repair of vehicles fueled by CNG, LNG, or hydrogen, shall be provided with an approved flammable gas-detection system.