No modifications or additions to a nonconforming use
or a nonconforming structure shall be permitted unless they are made in conformity
with the provisions of this chapter for the area of the floodplain occupied.
The words "modification" and "addition" include, but are not limited to, any
alteration, addition, modification, structural repair, rebuilding or replacement
of any such existing use, structure or accessory structure or use. Ordinary
maintenance repairs are not considered modifications or additions; these include
internal and external painting, decorating, paneling and the replacement of
doors, windows and other nonstructural components and the maintenance, repair
or replacement of existing private sewage or water supply systems or connections
to public utilities.