As used in this chapter, the following terms shall have the meanings indicated:
AIRBORNE SOUNDSound that reaches the point of interest by propagation through the air. Approved sound-measuring equipment shall meet ANSI SI.4 1971 standards as described under the definition of "dB(A)" below.
AIR COMPRESSORA device which draws in air or gas, compresses it and delivers it at a higher pressure.
AIR-CONDITIONING AND AIR-HANDLING DEVICEAny device that is designed to be used or is actually used to cool, move or condition air, including but not limited to air conditioners, cooling towers, fans and blowers.
AMBIENT NOISEThe all-encompassing noise associated with a given environment, being usually a composite of sounds from many sources, near and far.
A-WEIGHTED SOUND LEVELThe sound-pressure level in decibels as measured on a sound-level meter using the A-weighing network. The level so read is designated "dB(A)."
CONSTRUCTIONAny activity necessary or incidental to the erection, demolition, assembling, altering, installing or equipping of buildings, public or private highways, roads, premises, parks, utility lines or other property, including but not limited to related activities, such as land clearing, grading, earthmoving, excavating, blasting, filling and landscaping.
CONSTRUCTION DEVICEAny powered device or equipment designed and intended for use in construction. Examples of construction devices are air compressors, bulldozers, backhoes, trucks, shovels, derricks and cranes.
CONSTRUCTION SITEAny location, including land and water, where construction takes place.
dBThe abbreviation of decibel.
dB(A)The A-weighted sound level in decibels, as measured by a general-purpose sound meter complying with the provisions of the American National Standards Institute specifications for sound-level meters, properly calibrated and operated on the A-weighing network.
DECIBELThe unit for measuring the volume of a sound, based upon the pressure level of a sound. For the purpose of this chapter, the standard reference pressure stated herein will be used to assure a consistent and standard reference for measuring sound. The sound-pressure level measured in decibels is equal to 20 times the logarithm to the base 10 of the ratio of the effective pressure of the sound measured.
DEVICEAny machine, mechanism or equipment which is intended to or which actually produces sound or vibrations.
DISCRETE TONEA sound wave whose instantaneous sound pressure varies essentially as a simple sinusoidal function of time.
EMERGENCY OPERATION(1) The operation or parking of an authorized emergency vehicle when such vehicle is engaged in transporting a sick or injured person, responding to or working or assisting at the scene of an accident, disaster, public call, alarm of fire or any other emergency.
(2) The work or activity that is necessary to prevent or recover from an emergency, including but not limited to work to repair electric, gas, water, sewerage and/or telephone services.
EXHAUST SYSTEMA system which removes and transports air or gas from a device.
FREQUENCYA function period in time which is the reciprocal of the period and which is measured by the number of oscillations or cycles per second, expressed in hertz (Hz).
HOMEOWNERS' LIGHT RESIDENTIAL OUTDOOR EQUIPMENTAll engine- or motor-powered garden or maintenance tools intended for repetitive use in residential areas, capable of being used by a homeowner. Examples are lawn mowers, garden tools, riding tractors, snowblowers, power shovels and snowplows.
HzThe abbreviation for hertz, and is equivalent to cycles per second.
IMPULSIVE SOUNDA sound of short duration, usually less than one second, and of high intensity, with an abrupt onset and rapid delay. Examples include an explosion or discharge of a firearm.
L10The A-weighted sound level measured with slow response that is exceeded 10% of the time in any one-hour interval. The measurement time interval need not be one hour, provided that the measurement results are representative of a one-hour interval.
L90The A-weighted sound level measured with slow response that is exceeded 90% of the time in any one-hour interval. The measurement time interval need not be one hour, provided that the measurement results are representative of a one-hour interval.
MAXIMUM GROSS WEIGHTThe weight of the vehicle unladen, plus the weight of the maximum load to be carried by such vehicle during the registration period or the maximum gross weight for which the vehicle is registered, whichever is greater.
MOTOR VEHICLEEvery vehicle operated or driven upon a public highway, which is propelled by any power other than muscular power.
MUFFLERA device for abating the sound of escaping gases of an internal combustion engine or other sound source.
NOISE-SENSITIVE ZONEAn area adjacent to a site, including but not limited to any authorized school, church, house of worship, senior citizen center, day-care center, hospital or nursing home, which requires specific noise limitations.
PAVING BREAKERAny powered construction device that is designed to be used or is actually used to cut or trench pavement subbase, macadam, gravel, concrete or hard ground.
PERSONIncludes the singular and plural and also any natural person, firm, corporation, political subdivision, government agency, association, club, partnership, society or any other form of association or organization or any legal entity whatsoever.
PUBLIC HIGHWAYAny highway, road, street, avenue, public place, public driveway or any other public way.
SOUNDAn oscillation in pressure, stress, particle displacement or other physical parameter in a medium with internal forces (American National Standards Institute terminology).
SOUND LEVELThe weighted pressure level, measured by the use of a metering characteristic and the weighing A, B and C (American National Standards Institute terminology). For purposes of enforcing and interpreting the provisions of this chapter, unless a different frequency weighing is indicated, the A-weighing slow response shall apply.
SOUND-LEVEL METERAn instrument, including a microphone, an amplifier, an output meter and frequency-weighing networks for the measurement of sound levels (American National Standards Institute terminology).
SOUND-REPRODUCTION DEVICEAny device that is designed to be used or is actually used for the production or reproduction of sound, including but not limited to any musical instrument, radio, television, recorder, phonograph or any other sound-amplifying equipment.
SOUND TRUCKAny vehicle having mounted thereon or attached thereto sound-amplifying equipment.