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"(c) All new and replacement sanitary sewage systems shall <br />be located, designed and constructed to minimize or <br />eliminate infiltration of floodwaters into the systems <br />and discharges from the systems into floodwaters. <br />"(d) All new and replacement on-site waste disposal systems <br />shall be located, designed and constructed to avoid <br />impairment of them or contamination from them during <br />flooding. <br />"Section 41.10. Specific Standards for Zones A, AO and All. <br />In addition to requirements set forth in Section 41.9, the follow- <br />ing standards shall apply to permits for all developments within <br />zones A, AO and AH. <br />"(a) All new construction and substantial improvements of <br />residential structures shall have the lowest habitable <br />floor, including basement, at an elevation greater than <br />the crown of the nearest street to or above the depth <br />number specified in the FIRM. <br />"(b) All new construction and substantial improvement of <br />nonresidential structures shall: <br />"(1) Have the lowest habitable floor, including base- <br />ment, elevated above the crown of the nearest <br />street to or above the depth specified on the <br />FIRM; or <br />"(2) Together with attendant utility and sanitary <br />facilities, be completely floodproofed to or <br />above that level, so that any space below that <br />level is watertight with walls substantially <br />impermeable to the passage of water and with <br />structural components having the capability of <br />resisting hydrostatic and hydrodynamic loads and <br />effects of buoyancy. A registered professional <br />engineer or architect shall certify that such <br />floodproofing methods are adequate to withstand <br />the flood depths, pressures, velocities, impact <br />and uplift forces, and other factors associated <br />with the base flood. <br />"Section 41.11. Specific Standards for Zones Al A30.. In <br />addition to requirements set forth in Section 41.9, the following <br />standards shall apply to permits for developments within areas <br />designated as zones Al -A30: <br />"(a) All construction or substantial improvement of any <br />residential structures, excluding mobile homes, shall <br />have its lowest habitable floor, including basement, <br />at an elevation no lower than the base flood elevation. <br />"(b) All construction or substantial improvement of any com- <br />mercial, industrial or other nonresidential structure <br />shall either: <br />-5- <br />