Variation from engineering standards may be authorized only by the city upon submittal and approval of additional information, plans or design data, only by the engineer, which indicates that the requested variation is based on sound engineering judgment, that requirements for safety, environmental considerations, function, appearance and maintainability are fully met, and the variation is in the best interest of the public. All variations must be approved prior to the start of construction or in the event changes become necessary during construction before the actual changes are made. Requests for a variation on a project which has been previously reviewed by other agencies shall be sent to them for re-review before approval or denial of the variation. (Ord. 810 § 1, 1996).