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against overturning and uplift as required elsewhere in this Code. Internal pressures on internal walls, ceilings, and floors resulting from damaged windows or doors shall also be considered in the design unless the specified windows and doors have been tested by an approved testing agencyand have been shown to be capable of withstanding the design pressures required herein. 4. Mobile homes shall conform to the Federal Mobile Home Construction and Safety Standards of the Uniform Standards Code ANSI book 1A-119.1, pursuant to §320.823, Florida Statutes, in addition to the other requirements contained in this Chapter. Nonhabitable major structures need not meet the specific structural requirements of Section 10, except that they shall be designed to produce the minimum adverse impact on the beach and dune system and shall comply with the applicable standards of construction found all in this Code. All sewage treatment and public water supply systems shall be flood -proofed to prevent infiltration of surface water anticipated under design storm conditions. Underground utilities., excluding.pad transformers and vaults, shall be flood -proofed to prevent infiltration of surface water expected under design storm conditions or shall otherwise be designed to function when submerged under such storm conditions. SECTION 13 - STRUCTURAL REQUIREMENTS FOR MINOR STRUCTURES Minor structures need not meet the specific structural requirements of Section 41.38, except that they shall be designed to produce the minimum adverse impact on the beach and dune system and shall comply with the applicable standards of construction found elsewhere in this Code. Construction, except for elevated walkways, lifeguard support stands, piers, beach access ramps, gazebos, etc., shall be located a sufficient distance landward of the beach to permit natural shoreline fluctuations and to preserve dune stability. Construction, including excavation, may occur to the extent that the natural storm buffering and protection capability of the dune is not diminished. Where the public has established an accessway through private lands to lands seaward of the mean high tide or waterline by prescription, prescriptive easement, or any other legal means, development or construction shall not interfere with such right of access unless a comparable alternative accessway is provided. The developer shall have the right to improve, consolidate, or relocate such public accessways so long as they are: (a) Of substantially similar quality and convenience to the public; (b) Approved by the local government; and (c) Consistent with the coastal management element of the local comprehensive plan adopted pursuant to Section 163.3178, Florida Statutes. Assistance in determining the design parameters and methodologies necessary to comply with the requirements of this Chapter may be obtained from: Shore Protection Manual, U.S. Army Corps of Engineers, 4th Edition*, 1984.