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The substructure of the waterfront structure shall be protected by one of the following methods:
  1. Fire stops at intervals of 150 feet (45 720 mm); and
    1. A sprinkler system arranged for discharge of water to the entire substructure area; or
    2. Protected openings through decking for revolving nozzles or other water discharge equipment, so arranged as to permit water discharge onto the entire substructure area. Such openings shall be a minimum of 61/2 inches (165 mm) in diameter and spaced at 25 feet (7620 mm) intervals longitudinally and transversely. No cargo shall be stored on deck openings adjacent to the substructure fire stops and those in the main and fire hose aisles.
  2. A system of water spray nozzles arranged to permit water discharge onto the entire substructure area and installed in accordance with the Building Code.
  3. A system of trenches across the waterfront structure every 100 feet (30 480 mm). Such trenches shall not exceed 12 inches (305 mm) in width, shall be of substantial construction that conforms to the rest of the waterfront structure, shall extend to within 5 feet (1524 mm) of the sides of the waterfront structure, and shall have openings protected in sections not to exceed 25 feet (7620 mm) for access or removal in the event of fire. No cargo shall be placed directly above these openings, and durable signs shall be conspicuously posted on the waterfront structure to indicate the location of these openings.
  4. A system of deck openings and under-deck sprinkler protection approved by the commissioner. Openings shall be spaced at 25 feet (7620 mm) intervals longitudinally and transversely. No cargo shall be placed directly above these openings, and durable signs shall be conspicuously posted on the waterfront structure to indicate the location of these openings.

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