PLE-2022-07-supp-28-zoning - Laserfiche WebLink

17.08.160 (Pleasanton Supp. No. 28, 7-22) 442 2. New construction and substantial improvement of any structure in Zone AO or AH shall have the lowest floor, including basement, elevated one foot above the depth number specified on the FIRM or the highest adjacent grade, or at least three feet if no depth number is specified. Nonresidential structures may meet the standards in subsection (C)(3) of this section. Upon completion of the forms for the structure’s foundation, and prior to pouring the foundation, the elevation of the lowest floor, including basement, shall be certified by a registered civil engineer or licensed land surveyor, and verified by the building division, to be properly elevated. Such certification and verification shall be provided to the floodplain administrator. Upon the completion of the structure, the elevation of the lowest floor, including basement, shall be certified by a registered professional engineer or surveyor, or verified by the community building inspector to be properly elevated. Such certification or verification shall be provided to the floodplain administrator. 3. Nonresidential new construction or substantial improvements shall either be elevated in conformance with subsection (C)(1) or (C)(2) or together with attendant utility and sanitary facilities: a. Be floodproofed so that below one foot above the base flood elevation the structure is watertight with walls substantially impermeable to the passage of water; b. Have structural components capable of resisting hydrostatic and hydrodynamic loads and effects of buoyancy; and c. Be certified by a registered professional engineer or architect that the standards of this subsection are satisfied. Such certifications shall be provided to the floodplain administrator. 4. Require, for all new construction and substantial improvements, that fully enclosed areas below the lowest floor that are subject to flooding shall be designed to automatically equalize hydrostatic flood forces on ex- terior walls by allowing for the entry and exit of floodwaters. Designs for meeting this requirement must ei- ther be certified by a registered professional engineer or architect or meet or exceed the following mini- mum criteria. Either: a. A minimum of two openings having a total net area of not less than one square inch for every square foot of enclosed area subject to flooding shall be provided. The bottom of all openings shall be no higher than one foot above grade. Openings may be equipped with screens, louvers, valves or other coverings or devices provided that they permit the automatic entry and exit of floodwaters; or b. Be certified to comply with a local floodproofing standard approved by the Federal Insurance Ad- ministration. 5. Manufactured homes shall also meet the standards in Section 17.08.180. (Ord. 2239 § 2, 2022; Ord. 2216 § 2, 2021; Ord. 1951 § 1 (Exh. A), 2007; Ord. 1374 § 2, 1989) 17.08.160 Standards—Utilities. A. All new and replacement water supply and sanitary sewage systems shall be designed to minimize or eliminate infiltration of floodwaters into the system and discharge from systems into floodwaters. B. On-site waste disposal systems shall be located to avoid impairment to them or contamination from them during flooding. (Ord. 1951 § 1 (Exh. A), 2007; Ord. 1374 § 2, 1989) 17.08.170 Standards—Subdivisions. A. All preliminary subdivision proposals shall identify the flood hazard area and the elevation of the base flood. B. All final subdivision plans will provide the elevation of proposed structure(s) and pads. If the site is filled above the base flood, the final pad elevation shall be certified by a registered professional engineer or surveyor and pro- vided to the floodplain administrator. C. All subdivision proposals shall be consistent with the need to minimize flood damage. D. All subdivision proposals shall have public utilities and facilities such as sewer, gas, electrical, and water systems located and constructed to minimize flood damage.