| (a) The following are considered to be routine maintenance
activities that do not require an amended permit:
(1) the replacement of nuts and bolts;
(2) nailing, riveting, or welding;
(3) cleaning and painting;
(4) manipulation of the sign structure to level or
plumb it;
(5) changing of the advertising message;
(6) the replacement of minor parts if the materials
of the minor parts are the same type as those being replaced and the
basic design or structure of the sign is not altered;
(7) changing all or part of the sign face structure
but only if materials similar to those of the sign face being replaced
are used; and
(8) upgrading existing lighting for an energy efficient
lighting system.
(b) The following are considered to be customary maintenance
activities that may be made but require an amended permit prior to
the initiation of such an activity:
(1) replacement of poles, but only if not more than
one-half of the total number of poles of the sign structure are replaced
in any 12 month period and the same material is used for the replacement
poles; and
(2) adding a catwalk to the sign structure.
(c) The following are examples of substantial changes
that may be made but require an amended permit before the initiation
of such an activity:
(1) adding lights to an un-illuminated sign or adding
additional lights or adding more intense lighting to an illuminated
sign whether or not the lights are attached to the sign structure;
(2) changing the number of poles in the sign structure;
(3) adding permanent bracing wires, guy wires, or other
reinforcing devices;
(4) changing the material used in the construction
of the sign structure, such as replacing wooden material with metal
material;
(5) adding faces to a sign or changing the sign configuration;
(6) increasing the height of the sign;
(7) changing the configuration of the sign structure,
such as changing a "V" sign to a stacked or back to back sign, or
a single face sign to a back-to back sign; and
(8) moving the sign structure or sign face in any way
unless the movement is made in accordance with §21.435 of this
subchapter (relating to Permit for Relocation of Sign).
(d) To add a catwalk to a sign structure the catwalk
must meet Occupational Safety and Health Administration guidelines.
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