§ 34-361. Definitions.
As used in this article, the following words and terms shall have the meanings ascribed to them in this section, unless the context of their usage clearly indicates another meaning:
Baseline noise shall mean the total noise that is measured for at least five continuous minutes on residential property as a result of the combination of many sources of a steady character and duration. The term includes the continuous ambient noise and continuous noise of the source in question, but not impulse noises. The acceptable statistical measure to determine the baseline noise shall be the LA 90 .
City's jurisdiction shall mean and include territory within the city's limits and territory within 5,000 feet outside of the city's limits.
dB(A) shall mean the broadband sound pressure level (ref. 20 m Pa) expressed in decibels read from a calibrated sound level meter utilizing the A-level weighting scale as specified by the American National Standards Institute.
Engine-exhaust braking system shall mean a compression release engine brake device which converts diesel engine power into an air compressor and when engaged operates to slow the vehicle.
Impulse noise shall mean a sound of short duration, usually less than one second, with an abrupt onset and rapid decay. Examples of sources of impulse sound include, but are not limited to, gunfire, hammering, drop hammering, pile driving, drop forging, pneumatic hammering, pavement breaking, pipe handling, or metal impacts.
LA 90 shall mean the noise level exceeded 90 percent of the measurement time with "fast" time weighting and "A" frequency weighting in dB(A) as specified by the American National Standards Institute. Measurement time should be long enough for the LA 90 to converge to a stable value but not less than five minutes.
Residential property shall mean any property used as single family, duplex or multifamily dwelling units.
(Ord. No. 12,151, § 1, 1-10-13; Ord. No. 12,825 , § 2, 4-9-15)