No changes may be made in the location, dimension, character, or duration of the encroachment or use as granted by the permit except upon written authorization of the City Engineer; however, the location of underground pipes or conduits smaller than six inches in diameter shall be exempt from this requirement. No permit shall be required for the continuing use or maintenance of encroachments installed by public utilities or for changes therein or thereto where such changes or additions require no excavation of the right-of-way.
('66 Code, § 7-2.311) (Ord. 41-C-S, passed 2-7-68) Penalty, see §§ 1-2.01 et seq.