Nothing in this chapter shall prohibit the provision
of essential services, provided that the installation of such service
does not violate any other applicable provision of this chapter. Nothing
in this section shall be construed to permit the erection, construction
or enlargement of any aboveground structure except utility poles and
wires, except as otherwise permitted in this chapter.
Nothing in this chapter shall prevent the use
of a travel trailer, a mobile home or other similar structure in any
district as a temporary construction field office for a period not
to exceed the period of construction, or in other situations not to
exceed a period of one year; provided, however, that such structure
is not used for overnight sleeping accommodations and adequate arrangements
for sanitary facilities are made; and provided, further, that the
temporary field office has been certified as such and as conforming
to this chapter by the Code Enforcement Officer.