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ORDINANCE NS-2183 PAc . 0 7 any space below that level is watertight with walls substantially impermeable to the passage of water and with structural components having the capability of resisting hydrostatic and hydrodynamic loads and effects of buoyancy. SECTION 12: That section 7-33 of the Santa Ana Municipal Code is hereby amended to read as follows: Se=. 7-33. Same--Manufaotured homes. No manufactured home shall be placed or substantially improved in the AO or AH zones or that portion of an AE zone not designated as a floodway unless elevated on a permanent foundation such that the lowest floor of the manufactured home is at or above the base flood elevation, and securely anchored to resist flotation, collapse, or lateral movement. Methods of anchoring include, but are not limited to, use of over-the-top or frame ties to ground anchors. This section does not apply to manufactured homes to be placed or substantially improved in a manufactured home park or subdivision which was in existence on October 1, 1979, except where the repair, reconstruction, or improvement of the streets, utilities and pads equals or exceeds fifty (50) per cent of the value of the streets, utilities and pools [pads] before the repair, reconstruction or improvement commenced. This section does apply, however, to manufactured homes to be placed or substantially improved in an expansion to such a mobile home park or subdivision. SECTION 13: That section 7-34 of the Santa Ana Municipal Code is hereby amended to read as follows: 8eo. 7-34. AE zone--Regulatory floodway. No permit shall be issued for placement of any manufactured home in that portion of the AE zone which is designated as the regulatory floodway, nor shall any permit be issued for any encroachments, including fill, new construction, substantial improvements, and other development within such regulatory floodway which would result in any increase in flood levels within the community during the occurrence of the base flood discharge. SECTION 14: That section 7-35 of the Santa Ana Municipal Code is hereby amended to read as follows: Sec. 7-35. Same--Residential structures. (a) Ail new construction and substantial improvements of 6