For purposes of this Article
IV, the following words and phrases are defined and shall be construed as defined below unless it shall be apparent from the context that a different meaning is intended.
A-WEIGHTING SOUND LEVEL
The sound pressure level in decibels as measured on a sound
level meter using an A-weighting network. The level so read is designated
dBA.
AMBIENT NOISE LEVEL
The A-weighted sound pressure level of all the encompassing
noise associated with a given environment, being usually a composite
of sounds from many sources.
CITY
The City of Cottleville, Missouri.
CITY ADMINISTRATOR
The City Administrator of the City of Cottleville, Missouri,
or his/her designee(s).
DECIBEL (dB)
A unit for describing the amplitude of sound, equal to twenty
(20) times the logarithm to the base 10 of the ratio of the pressure
of the sound measured to the reference pressure, which is twenty (20)
micronewtons per square meter.
DWELLING
Shall have the same meaning set forth in Section
405.020, as amended.
EMERGENCY WORK
Work performed for the purpose of preventing or alleviating
physical trauma or property damage threatened or caused by an existing
or imminent peril.
EXCESSIVE NOISE
Any noise which violates the factors or standards set forth
in this Article.
EXCESSIVE VIBRATION
The presence of a vibration or vibrations of such intensity,
duration, frequency or character which annoy, disturb, or cause or
tend to cause adverse psychological or physiological effects on persons,
or damage or tend to damage personal or real property.
FACILITY
The area, buildings and equipment used by any person at a
single location in the conduct of business.
HOUSE OF WORSHIP
Any church, synagogue, mosque, other building or structure,
or public or private place used for religious worship, religious instruction,
or other religious purpose.
LAND USE CATEGORY
1.
Commercial zoning districts;
2.
Industrial zoning districts; or
3.
Residential zoning districts.
NOISE
An undesired sound.
PERIOD OF OBSERVATION
The time interval during which acoustical data are obtained.
The period of observation is determined by the characteristics of
the sound being measured and should also be at least ten (10) times
as long as the response time of the instrumentation. The greater the
variance in indicated sound level, the longer must be the observation
time for a given expected accuracy of the measurement.
PERSON
Any individual, association, partnership or corporation and
including any officer, employee, department, agency or instrumentality
of the United States, the State of Missouri or any political subdivisions
thereof.
"SLOW" RESPONSE
A metering function to be used in measurement of sound for
determination of enforcement of the objective sound standards —
allowable levels stated within this Article.
SOUND
An oscillation in pressure, particle displacement, particle
velocity or other physical parameter, in a medium with internal forces
that cause compression and rarefaction of that medium resulting in
air pressure variations perceptible by the human ear. The description
of sound may include any characteristic of such sound, including duration,
intensity and frequency.
SOUND LEVEL
The unweighted ("flat") or weighted sound pressure level
obtained by the use of a sound level meter and frequency weighting
network, such A, B or C as specified in the American National Standards
Institute specifications for sound level meters (ANSI S1.4). If the
frequency weighting employed is not indicated, the A-weighting shall
apply.
SOUND LEVEL METER
Any instrument including a microphone, an amplifier, an output
meter and frequency weighting networks for the measurement of sound
pressure levels in a specified manner which complies with Type 2 of
better standards established in the ANSI S1.4-1971 "Specification
for Sound Level Meters."
SOUND PRESSURE LEVEL
Twenty (20) times the logarithms to the base ten (10) of
the ratio of the roof mean squared (DBMS) sound pressure to the reference
pressure of twenty (20) micronewtons per square meter.
SOUND RECEPTOR
The location or property boundary receiving sound from a
sound source.
SOUND SOURCE
The location of property boundary from which a sound emanates.
VIBRATION
An oscillatory motion of solid bodies of deterministic or
random nature described by displacement, velocity or acceleration
with respect to a given point.
ZONING DISTRICT
Districts established by the zoning ordinances of the City and found in Chapter
405 of the Municipal Code of the City of Cottleville, Missouri, as amended.