If the work described in any zoning permit has not begun within six (6) months from the date of issuance thereof, said permit shall expire; it shall be revoked by the Zoning Inspector; and written notice thereof shall be given to the person or persons affected. If the work described in any zoning permit has not been substantially completed within (1) year of the date of issuance thereof, said permit shall expire and be revoked by the Zoning Inspector, and there shall be a written notice that further work as described in the canceled permit shall not proceed unless and until a new zoning permit is issued for temporary structures and said permit shall be valid for a maximum of three (3) months. (Ord. 717. Passed 7-10-89.)