A. General Permit. The city engineer shall determine the life of the general permit, but it shall not exceed one year, as stated in the permit. The city engineer may revoke this permit at any time based on unsatisfactory performance.

B. Project Permit. Each project permit shall be in full force and effect for 60 days from the date of issue, unless otherwise stated in the permit.

C. Citywide Permit. The citywide permit shall be in full force and effect until revised or revoked by the city engineer. The allowable duration of a project shall be as stated in the permit.

D. Time Limits. The city engineer may determine that a specific project may require more than 60 days for completion and may permit such time as deemed necessary for completion. He may determine the necessity for a time extension during the life of the project permit and thereby amend the permit. Time beyond 180 days shall be subject to additional fees for each 60 days or part thereof.

E. Time for Excavation, Backfilling and Compaction of Trenches across Rights-of-Way.