As used in this chapter:
(a) "Acceleration" means the time rate of change of velocity.
(b) "Ambient noise" means the all encompassing noise associated with a given environment, usually being a composite of sounds from many sources.
(c) "ANSI" means the American National Standards Institute or its successor bodies.
(e) "Critical construction equipment" means construction equipment required to operate twenty-four hours a day to protect the health and safety of the public and the construction workers.
(f) "Cycle" means the complete sequence of values of a periodic quantity that occur during a period and is referred to as cycles per second or Hertz.
(g) "dBA" means the A weighted sound pressure level obtained by the use of metering characteristics in the A weighting network specified in ANSI S1.4-1971, as amended.
(h) "Decibel (dB)" means a unit of measure, on a logarithmic scale to the base ten, of the ratio of the magnitude of a particular sound pressure to a standard reference pressure, which, for the purposes of this chapter, is twenty micronewtons per square meter (20MN/m2).
(i) "Displacement" means the magnitude of the motion.
(j) "Emergency work" means work made necessary to restore property to a safe condition following a public calamity, work required to protect persons or property from an imminent exposure to danger or work by private or public utilities when restoring utility services or protecting such utility services from imminent danger. (Ord. 77-83. Passed 9-20-83.)
(k) “Excessive noise” means any offensive sound or noise which annoys, disturbs, injures or endangers the comfort, repose, health, peace or safety of others, or annoy, inconvenience or disturb a reasonable person of normal sensitivities by its characters, intensity or duration, or a noise level which exceeds the fixed source noise level for the zone when measured at the nearest property line.
(Ord. 72-2005. Passed 6-7-05.)
(l) "Fixed source" means a machine or device capable of creating a noise level at the property upon which it is regularly located, including, but not limited to, air conditioning and refrigeration apparatus, industrial and commercial process machinery and fans.
(m) “Impulsive sound” means a noise characterized by brief excursions of sound pressure, significantly exceeding the ambient noise, of which the duration of a single impulse is less than one second and which requires, for accurate measurement specifically designed instrumentation.
(n) "Impulsive vibration" means vibration resulting from an impact source, such as blasting or pile driving.
(o) "Motor vehicle" includes, but is not limited to, automobiles, trucks, motorcycles, minibikes, go-carts and snowmobiles.
(p) "Noise" means any undesired sound.
(q) "Particle velocity" means the time rate of change of displacement.
(r) "Sound" means an oscillation in air pressure.
(s) "Sound analyzer" means a device for measuring a specific band pressure level or pressure spectrum level of a sound as a function of frequency.
(t) "Sound level" or "noise level" means, in decibels, the A weighted sound pressure level, measured by the use of metering characteristics and frequency weightings specified in ANSI S1.4-1971, as amended.
(u) "Sound level meter" means an instrument, including a microphone, an amplifier, an output meter and frequency weighting networks, for the measurement of noise and sound levels in a specified manner. The meter must satisfy the applicable requirements for Type 2 sound level meters, as defined in ANSI S1.4-1971, as amended.
(v) "Sound pressure level" means, in decibels, twenty times the logarithm to the base ten of the ratio of the magnitude of a particular sound pressure to a standard reference pressure, which, for the purposes of this chapter, shall be twenty micronewtons per square meter (20 MN/m2).
(w) "Steady state vibration" means continuous earthborne oscillations.
(x) "Zoning districts" means those zoning districts established by Chapter 1220 of these Codified Ordinances. (Ord. 77-83. Passed 9-20-83.)
(y) “Person” means any individual, association, partnership, company, corporation, joint venture firm, and includes any officer, employee, department agency or instrumentality of a state or any public subdivision of a state.
(Ord. 71-2005. Passed 6-7-05.)