The following activities shall be exempt from the permitting requirements of section 90-131:
(1) Maintenance performed on existing mosquito control drainage structures, provided that it does not increase the peak discharge rate or pollution load.
(2) Maintenance of stormwater structures which does not change the design peak discharge rate, volume or pollution load of runoff; on-site storage capacity; or erosion from the site.
(3) Single-family and duplex homes in a subdivision which has an approved stormwater management system. However, this does not exempt such sites from the retrofitting requirements in an approved retrofitting target area.
(4) Any development within a subdivision if all of the following conditions are met:
a. Stormwater management provisions for the subdivision were previously approved by the city and remain valid as part of a final plat.
b. The development is conducted in complete accord with the stormwater management provisions submitted with the final plat.
(5) Bona fide agricultural pursuits, for which a program of best management practices has been approved and accordingly implemented by the local soil and water conservation district or the St. Johns River Water Management District.
(6) Emergency exemptions as follow:
a. This article shall not be construed to prevent any act otherwise lawful and necessary to prevent material harm to property as a result of an emergency, including but not limited to fire, infestation by pests, hazards resulting from storms or hurricanes or when property is in imminent peril, and the necessity of obtaining a permit is impractical and would cause undue hardship in the protection of the property.
b. A report of any such emergency action shall be made to the building official by the owner or person in control of the property upon which the emergency action was taken; this report shall be made as soon as practicable, but not more than ten days following the action. Remedial measures may be required by the building official.