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1. Noise originating from aircraft in flight, and sounds which originate at <br /> airports and are directly related to flight operations; <br /> 2. Noise created by safety and protective devices, such as relief valves <br /> where noise suppression would defeat the safety release intent of the <br /> device; <br /> 3. Noise created by fire alarms; <br /> 4. Noise created by emergency equipment, including, but not limited to, <br /> emergency standby or backup equipment, and emergency work <br /> necessary in the interests of law enforcement or of the health, safety or <br /> welfare of the community; and including, but not limited to, any emergency <br /> work necessary to replace or repair essential utility services; <br /> 5. Noise created by auxiliary equipment on motor vehicles used for highway <br /> maintenance; <br /> 6. Noise originating from officially sanctioned parades, sporting events and <br /> other public events; <br /> 7. Noise created by warning devices not operated continuously for more than <br /> thirty minutes per incident; <br /> 8. Noise created by motor vehicles when regulated by Sections 20.08.060 <br /> through 20.08.080; <br /> 9. Noise caused by natural phenomena; <br /> 10.Noise created by motor vehicles, licensed or unlicensed, when operated <br /> off public highways except when such sounds are received in District I of <br /> the city; <br /> 11.Noise originating from existing natural gas transmission facilities until such <br /> time as the state sets regulations governing said facilities. <br /> B. The following sources of noise are exempt or partially exempt from the <br /> provisions of this chapter: <br /> 1. Noise created by the operation of equipment or facilities of surface carriers <br /> engaged in commerce by railroad; <br /> 2. Noise created by watercraft and float planes; <br /> 3. Noise emanating from temporary construction sites except between the <br /> hours of ten p.m. and seven a.m.; provided, however, noise emanating <br /> 76 <br />