A. “Arterial” means a principal, minor or collector arterial as now or hereafter defined in the city’s comprehensive plan, Policy TR-39.

B. “A-weighted sound level” means the sound pressure level in decibels measured using the “A”-weighted network on a sound level meter as specified by the American National Standards Institute specification for sound level meters as now existing or as hereafter amended or modified. The level so read is designated dBA.

C. “Construction” means any site preparation (including blasting), assembly, erection, demolition, substantial repair, alteration, or similar action for or of public or private rights-of-way, structures, utilities or similar property.

D. “Decibel (dB)” means a unit for measuring the volume of sound.

E. “EDNA” means environmental designation for noise abatement, which is an area within which maximum permissible noise levels are established by the Washington State Department of Ecology and this code.

F. “Emergency work” means work required to restore property to a safe condition following a public calamity, work required to protect persons or property from imminent exposure to danger, or work by private or public utilities to provide or restore immediately necessary utility service.

G. “Generator, portable” means an electricity-generating device that is not permanently mounted and uses temporary wiring to supply electrical service.

H. “Generator, stationary” means an electricity-generating device with noise attenuation that is permanently mounted and uses permanent wiring to supply electrical service.

I. “Heavy equipment” means backhoes, concrete mixing and pumping trucks, compactors/rollers, cranes, dozers, dump trucks, excavators, forklifts, graders, jackhammers, loaders, pavement breakers, pile drivers, portable crushers, tractors, trailer-mounted woodchippers, trenchers, or other pieces of equipment that generate similar levels of noise.

J. “Impulsive sound” means sound of short duration, usually less than one second, with an abrupt onset and rapid decay, with a peak value exceeding the ambient level by more than 10 dBA.

K. “Ldn” means the day-night average sound level which is a 24-hour energy average of the A-weighted sound pressure level where 10 dBA is added to nighttime noise levels from 10:00 p.m. to 7:00 a.m. before averaging.

L. “Legal holiday” means Sundays and holidays as defined by the city of Bellevue and in RCW 1.16.050 as now exists or as hereafter amended or modified.

M. “Leq” means the equivalent A-weighted sound level which is the constant sound level that, in a given situation and time period, conveys the same sound energy as the actual time-varying A-weighted sound.

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

O. “Person responsible for the violation” means any person who is required by the applicable regulation to comply therewith, or who commits any act or omission which is a violation or causes or permits a violation to occur or remain upon property in the city, and includes but is not limited to owner(s), lessor(s), tenant(s), or other person(s) entitled to control, use and/or occupy property where a violation occurs.

P. “Pure tone component” means any sound which can be distinctly heard as a single pitch or a set of single pitches. A pure tone shall exist if the one-third octave band sound pressure level in the band with the tone exceeds the arithmetic average of the sound pressure levels of the two contiguous one-third octave bands by five decibels for center frequencies of 500 Hz and above, by eight decibels for center frequencies between 160 Hz and 400 Hz, and by 15 decibels for center frequencies less than or equal to 125 Hz.

Q. “Receiving property” means real property within which sound originating from outside the property is received.

R. “Sound amplification equipment” means any machine or device for the amplification of the human voice, music or any other noise or sound.

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

T. “Sound level meter” means a device which measures sound pressure levels and conforms to Type I, S1A, Type II or S2A, as specified in the American National Standards Institute Specification Section 1.4 (1971) as now exists or as hereafter amended or modified.

U. “Warning device” means any device intended to provide public warning of potentially hazardous, emergency or illegal activities, including but not limited to a burglar alarm or vehicle backup signal.

V. “Weekday” means any day Monday through Friday which is not a legal holiday.

W. “Weekend” means Saturday, Sunday and any legal holiday. (Ord. 5719 § 3, 2007; Ord. 5300 § 1, 2001; Ord. 5194 § 1, 2000; Ord. 4996 § 3, 1997; Ord. 4241 § 2, 1991.)