1. Noise originating from aircraft in flight, and sounds which originate at airports and are directly related to flight operations;

2. Noise created by the operation of equipment or facilities of surface carriers engaged in commerce by railroad;

3. Noises created on property of federal military facilities;

4. Noise created by watercraft and float planes in operation;

5. Noise created by safety and protective devices, such as relief valves where noise suppression would defeat the safety release intent of the device;

6. Noise created by fire alarms being used for their intended purpose;

7. Noise created by emergency equipment, including, but not limited to, emergency standby or backup equipment, and emergency work necessary in the interests of law enforcement or of the health, safety or welfare of the community; and including, but not limited to, any emergency work necessary to replace or repair essential utility services;

8. Noise created by auxiliary equipment on motor vehicles used for highway maintenance;

9. Noise originating from officially sanctioned parades, sporting events and other public events;

10. Noise created by motor vehicles when regulated by Sections 20.08.060 through 20.08.080;

11. Noise caused by natural phenomena;

12. Noise originating from motor vehicle racing events at existing authorized facilities;

13. Noise created by existing stationary equipment used in the conveyance of water by a utility and noise created by existing electrical substations;

14. Noises in compliance with a lawfully issued conditional use permit or SEPA determination. (Ord. 3509-16 § 10, 2016; Ord. 1971-93 § 2, 1993; Ord. 1556-89 § 2, 1989; Ord. 564-78 §§ 1—3, 1978; Ord. 534-78 § 6(a), (b), 1978.)