The following words and phrases as used in this Chapter shall
have the following meanings:
Ambient noise level.
The all-encompassing noise level associated with a given
environment, being a composite of sounds from all sources, excluding
the alleged offensive noise, at the location and approximate time
at which a comparison with the alleged offensive noise is to be made.
A-weighted sound level.
The level in decibels of sound as measured with a sound level
meter with a reference pressure of twenty micro-Pascals using the
A-weighted network (scale) at a slow response. The unit of measurement
shall be designated as dBA.
Community event.
Any event that has obtained a Community Event Permit pursuant to Santa Monica Municipal Code Chapter
4.68.
Construction activity.
Shall mean the following:
(1)
The operation of any tool, machine or equipment including, but
not limited to, vehicles and helicopters being used by the City, public
utilities, contractors or subcontractors and their employees to carry
out any work for which a building permit is required, including, but
not limited to, demolition, grading, excavating, or construction;
(2)
Performing any construction, maintenance, or repair on buildings,
structures, or utilities or any work preparing the site for construction
or repair, including, but not limited to, staging, grading, excavation,
and demolition;
(3)
Any painting using motorized equipment or any painting that
is part of the construction activity for which a building permit has
been issued;
(4)
The loading or unloading of construction equipment, materials,
or supplies from vehicles at or near the site of the construction
activity;
(5)
The staging or idling, at or near the site of construction activity,
of any construction vehicle or any vehicles bringing construction
equipment, materials or supplies to the site of the construction;
(6)
The staging or idling, at or near the site of construction activity,
of any food services vehicle providing food services to persons working
at a site of construction activity or the use of a horn or other device
by a food services vehicle to alert customers that the vehicle has
arrived.
Decibel (dB).
A unit that denotes the ratio between two quantities that
are proportional to power: the number of decibels corresponding to
the ratio of two amounts of power is ten times the logarithm to the
base ten of this ratio.
Emergency machinery, vehicle, work or alarm.
Any machinery, vehicle, work or alarm used, employed, performed
or operated in an effort to protect, provide or restore safety conditions
in the community or for the citizenry, or work by private or public
utilities when restoring utility service or work repairing public
infrastructure.
Equivalent noise level (Leq).
The equivalent noise level as measured using the A-weighted
sound level decibel scale. The measurement of equivalent noise level
shall be in accordance with International Electrotechnical Commission
(IEC) International Standard 61672 (Part 1), "Electroacoustics—Sound
Level Meters," Section 3.9, "Equivalent Continuous Sound Level," or
most recent revision thereof.
Fixed noise source.
A device that creates sounds while fixed or motionless, including,
but not limited to, residential, agricultural, industrial or commercial
machinery, equipment, pumps, fans, compressors, air conditioners,
construction, or refrigeration equipment.
Grading.
Any excavating or filling of earth material or any combination
thereof conducted at a site to prepare said site for construction
or other improvements thereon.
Hertz (Hz).
The unit that describes the frequency of a function periodic
in time, which is the reciprocal of the period.
Health care institution.
Any hospital, convalescent home or other similar facility,
excluding residential care facilities that provide health care, medical
treatment, room, board or other services for the ill, retarded or
convalescent.
Impulsive noise.
A noise of short duration usually less than one second and
of high intensity, with an abrupt onset and rapid decay.
Intruding noise level.
The total sound level, expressed in the A-weighted sound
level decibel scale, created, caused, maintained or originating from
an alleged offensive source at a specified location while the alleged
offensive source is in operation.
Mechanical equipment.
Equipment such as pool pumps, spa pumps, air conditioners
and accessory equipment such as generators, ducts and vents.
Noise sensitive land use.
Public or private schools, places of worship, cemeteries,
libraries, hospitals and similar health care institutions.
Person.
A person, firm, association, co-partnership, joint venture,
corporation or any entity, public or private in nature.
Simple tone noise.
A noise characterized by a predominant frequency or frequencies
so that other frequencies cannot be readily distinguished. If measured,
simple tone noise 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 dB for frequencies of five hundred Hz and above; eight dB
for frequencies between one hundred sixty and four hundred Hz; and
fifteen dB for frequencies less than or equal to one hundred twenty-five
Hz.
Sound amplifying equipment.
Any machine or device used to amplify music, the human voice,
or any other sound, but does not include: (1) vehicle radios or stereos
when used and heard only by the occupants of the vehicles in which
they are installed; or (2) machines or devices designed and operated
for personal use and heard only by the person utilizing such a machine
or device.
Sound level meter.
An instrument meeting International Electrotechnical Commission
(IEC) International Standard 61672 (Parts 1 and 2) "Electroacoustics—Sound
Level Meters," or most recent revision thereof, for a Type 1 sound
level meter or an instrument and the associated recording and analyzing
equipment that will provide equivalent data.
Sound pressure level.
Twenty times the logarithm to the base ten of the ratio of
the pressure of the sound to a reference pressure that shall be explicitly
stated. The term "noise level" used in this Chapter is the sound pressure
level.
Stationary.
Remaining in a fixed location for at least five minutes.
Vibration.
Any movement of the earth, ground or other similar surface
created by a temporal and spatial oscillation of displacement, velocity
or acceleration in any mechanical device or equipment located upon,
attached or affixed to, or in conjunction with that surface.
(Added by Ord. No. 2115CCS § 1, adopted 2/24/04; amended
by Ord. No. 2679CCS § 1, adopted 8/24/21)