The following words and phrases, when used in this
chapter, shall have, unless the context clearly indicates otherwise,
the meanings given to them in this section:
ANSI
American National Standards Institute, or its successors.
DAYTIME
From 7:00 a.m. to 9:00 p.m., prevailing time.
DECIBEL (dB)
A unit of sound level which is a division of a logarithmic
scale used to express the ratio of sound pressure of the source to
the pressure of an arbitrarily chosen reference pressure; the ratio
is expressed on the decibel scale by multiplying its base 10 logarithm
by 20.
EXCESSIVE NOISE
That sound which is:
(1)
Injurious or which unreasonably interferes with the comfortable
enjoyment of life and property. Measured noise levels in excess of
limits established in these regulations or those specified in valid
permits are declared to be excessive noise.
(2)
Annoying to a person of ordinary sensibilities.
NIGHTTIME
From 9:00 p.m. to 7:00 a.m., prevailing time.
NOISE
Any sound emitted by a person, animal, appliance, equipment,
instrument or other device.
NOISE LEVEL
Airborne sound levels expressed in dB and obtained by the
use of specific frequency-dependent weighting networks, as specified
in the referenced standards and indicated by proper notation. If A-weighting
is employed, the sound level is identified as dB(A).
NOISE POLLUTION
Noise of such loudness and character, from a single source
or from multiple sources, which is or may be predicted with reasonable
certainty to be injurious to health or which unreasonably interferes
with the enjoyment of property or with any lawful business or activity.
Noise/sound-pressure levels exceeding those permitted in any district
shall constitute noise pollution.
PERIOD OF OBSERVATION
The time interval during which acoustical data are obtained.
The period of observation is determined by the characteristics of
the noise being measured and the instrumentation being used. The period
of observation must be at least as long as the response time of the
instrumentation. The greater the variance in individual sound level,
the longer the observation time for a given expected accuracy of measurement.
PERSON
Includes an individual, firm, association, organization,
partnership, trust, company, corporation or any other similar entity.
SOUND-LEVEL METER
An instrument or combination of instruments which meet or
exceed the requirements for an ANSI Type SIA or Type S2A sound-level
meter.
TOWNSHIP
Township of South Strabane, Washington County, Pennsylvania.
VEHICLE
Any device or combination of devices used or capable of being
used for transporting persons or property. "Vehicles" include, but
are not necessarily limited to, automobiles, trucks, buses, motorcycles,
motorized bicycles, snowmobiles, scooters, all-terrain vehicles, go-carts,
farm machinery, industrial machinery, highway graders, trailers, graders
and semitrailers.