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shall not exceed 50, 000 square feet. There shall be no more open- <br /> ings throe h these transverse walls than are necessary for the <br /> economical handling of traffic. <br /> 1. Fire walls for all superstructures shall be constructed of <br /> reinforced concrete, shall have structural stability under fire <br /> and normal operating conditions, and shall have a fire resist- <br /> ance rating of at least four hours. Fire walls may be constructed <br /> of other non-combustible materials provided such walls meet the <br /> foregoing stability and fire protections requirements and have <br /> equivalent durability and resistance to mechanical damages under <br /> normal operating conditions or, where required, stability to <br /> resist earthquake, flood or other natural forces in accordance <br /> with recognized good engineering practice. <br /> II. Fire walls shall extend continuously from the pier deck to a <br /> point three feet above the roof, except that in fire-resistive <br /> superstructures fire walls may extend to the underside of the <br /> roof. When superstructures are constructed upon combustible <br /> substructures fire walls shall extend to low water. "T" walls <br /> shall be provided at the ends of each fire wall of combustible <br /> superstructures and shall extend ten (10) feet beyond such fire <br /> walls in each direction. <br /> III. Fire doors for the protection of openings in fire walls shall <br /> be constructed and installed in accordance with the Standard for <br /> the Lnstallation of Fire Doors and Windows (NFPA No. 80, 1968). <br /> Fire doors shall have a fire resistance rating of three hours and <br /> except by special permission of the Chief of the Fire Department, <br /> shall be installed on each side of the wall. Doors of an area <br /> exceeding 120 square feet shall be so designed as to give additional <br /> strength proportionate to the excess area of the door openings. When <br /> door openings are above railroad tracks standard sills shall be pro- <br /> vided flush with the top of the rails. <br /> Section 10. Fxisting Structures. <br /> Within five (5) years from the effective date of this ordinance, all <br /> existing combustible structures shall meet the following requirements: <br /> A. Combustible Substructures. <br /> All existing combustible substructures shall have a complete <br /> system of automatic sprinklers installed in accordance with <br /> Section 5 (D) of this ordinance. In existing substructures where in <br /> the opinion of the Chief of the Fire Department, it is impracticable <br /> to install and maintain an automatic sprinkler system, the instal- <br /> lation of deck openings for revolving nozzles and other devices may <br /> be accepted in lieu thereof. Such installations shall meet the follow- <br /> ing requirements: <br /> 1. Openings in the pier deck shall. be provided at intervals not <br /> exceeding 25 feet on centers and at least 5 feet from the pier <br /> or wharf edge, to enable the fire department to place in opera- <br /> tion with the least passible delay devices suitable for extinguish- <br /> ing underdeck fires. Openings shall be over clear spaces tc <br /> avoid interference by substructure to effective operation of <br /> extinguishing devices. These openings should not be larger than <br /> ten inches in their greatest dimensions, but must be of sufficient <br /> size to readily accommodate the appliances for which they are <br /> Ordinance -11- <br />