1. “Ambient sound level” means the background level of all sound in a given EDNA independent of the specific source being measured. The “A”-weighted sound pressure level exceeded 90 percent of the time based on a one-hour period.

2. “dBA” means the sound pressure level in decibels measured using the “A”-weighting network on a sound level meter as specified in the American National Standards Institute Specification (§ 1.4-1971) for sound level meters.

3. “Decibel” means a unit of sound, based on a logarithmic scale, of the ratio of the magnitude of a particular sound pressure to a standard reference pressure of 20 micropascals.

4. “EDNA” means the environmental designation for noise abatement, being an area or zone (environment) within which maximum permissible noise levels are established.

5. “Emergency vehicle” means a motor vehicle used in response to a public calamity or to protect persons or property from an imminent exposure to danger.

6. “Gross vehicle weight rating (GVWR)” means the value specified by the manufacturer as the loaded weight of a single vehicle.

7. “Impulse sound” means either a single pressure peak or a single burst (multiple pressure peaks) for a duration of less than one second as measured on a peak unweighted sound level meter.

8. “Impulsive sound” means sound having the following qualities: the peak of the sound level is less than one second and short compared to the occurrence rate; the onset is abrupt; the decay rapid; and the peak value exceeds ambient level by more than 10 dBA.

9. “In-use motor vehicle” means any motor vehicle which is used on a public highway except farm vehicles as defined under RCW 46.04.181.

10. “Motor vehicle” means any vehicle which is self propelled, used primarily for transporting persons or property upon public highways and required to be licensed under RCW 46.16.010. Airplanes, water craft and vehicles used exclusively on stationary rails or tracks are not motor vehicles as that term is used in this chapter.

11. “Motor vehicle racing event” means any motor vehicle competition conducted under a permit issued by the city of Lynnwood and under the auspices of a recognized sanctioning body.

12. “Motorcycle” means any motor vehicle having a saddle for the use of the rider and designed to travel on not more than three wheels in contact with the ground, except farm tractors.

13. “Muffler” means a device consisting of a series of chambers or other mechanical designs for the purpose of receiving exhaust gas from an internal combustion engine and effective in reducing noise resulting therefrom.

14. “Noise” means the intensity, duration and character of sounds, from any and all sources.

15. “Noise disturbance” means any sound which annoys, disturbs, or perturbs reasonable persons with normal sensitivities; or any sound which injures or endangers the comfort, repose, health, hearing, peace, or safety of other persons.

16. “Noise sensitive area” means any area so designated by the city of Lynnwood in which noise sensitive activities are conducted and which require exceptional quiet. Such activities include, but are not limited to, the operation of schools, hospitals, nursing homes, courts and churches.

17. “Off-highway vehicle” means any self-propelled vehicle not used primarily for transporting persons or property upon public highways nor required to be licensed under RCW 46.16.010.

18. “Operator” means any person who is in actual physical or electronic control of a powered watercraft, motor vehicle, aircraft, off-road vehicle, or any other engine-driven vehicle.

19. “Periodic sound” means sound having the following qualities:

20. “Person” means any individual, corporation, partnership, association, governmental body, state agency or other entity whatsoever.

21. “Powered model vehicle” means any mechanically propelled vehicle, either airborne, waterborne, or landborne, designed not to carry persons or property such as, but not limited to, model airplanes, boats, cars and rockets.

22. “Property boundary” means the surveyed line at ground surface, which separates the real property owned, rented, or leased by one or more persons, from that owned, rented, or leased by one or more persons, and its vertical extension.

23. “Public space” means an area which is owned or controlled by a public governmental entity and maintained for the use of the general public.

24. “Public highway” means the entire width between the boundary line of every way publicly maintained by the Department of Highways or any county or city when any part thereof is generally open to the use of the public for purposes of vehicular travel as a matter of right.

25. “Receiving property” means real property at the boundaries of which the maximum permissible noise levels specified in this chapter shall not be exceeded from sources outside such property.

26. “Sound level” means a weighted sound pressure level measured by use of a sound level meter using an “A”-weighted network and reported as dBA.

27. “Sound level meter” means a device which measures sound pressure levels and conforms to Type 1 or Type 2 as specified in the American National Standards Institute publications (§ 1.4-1971).

28. “Watercraft” means any contrivance, excluding aircraft, used or capable of being used as a means of transportation or recreation on water, including model craft, powered by an internal or external combustion engine. (Ord. 1386 § 1, 1983; Ord. 1275 § 1, 1982)