1990-102 Oro
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THE CORPORATION OF THE TOWNSHIP OF ORO
BY-LAW NO. 90-102
A BY-LAW TO CONTROL NOISE
WHEREAS it is expedient to exercise the power conferred upon the
Council by The Environmental Protection Act, R.S.O. 1980, as
amended, and other statutory authority; and
WHEREAS a recognized body of scientific and technological
knowledge exists by which sound and vibration may be
substantially reduced; and
WHEREAS the people have a right to and should be ensured an
environment free from unusual, unnecessary or excessive sound or
vibration which may degrade the quality and tranquillity of
their life or cause nuisance; and
WHEREAS it is the policy of the Council to reduce and control
such sound or vibration;
NOW THEREFORE the Council of the Corporation of the Township of
Oro enacts as follows:
1. INTERPRETATION
(1) Technical Terms
In this by-law all the words which are of a technical
nature and are related to sound or vibration shall
have the meanings specified for them in Publication
NPC-101 - Technical Definitions.
(2) Definitions
In this by-law,
(a) Certificate
"certificate" means a certificate of Competency
in Environmental Acoustics Technology of a
specified class issued by the Minister of the
Environment;
(b) Construction
"construction" includes erection, alteration,
repair, dismantling, demolition, structural
maintenance, painting, moving, land clearing,
earth moving, grading, excavating, the laying of
pipe and conduit whether above or below ground
level, street and highway building, concreting,
equipment installation and alteration and the
structural installation of construction
components and materials in any form or for any
purpose, and includes any work in connection
therewith;
(c) Construction Equipment
"construction equipment" means any equipment or
device designed and intended for use in
construction, or material handling, including but
not limited to, air compressors, pile drivers,
pneumatic or hydraulic tools, bulldozers,
tractors, excavators, trenchers, cranes,
derricks, loaders, scrapers, pavers, generators,
off-highway haulers or trucks, ditchers,
compactors and rollers, pumps, concrete mixers,
graders or other material handling equipment;
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(d)
Conveyance
"conveyance" includes a vehicle and any other
device employed to transport a person or persons
or goods from place to place but does not include
any such device or vehicle if operated only
within the premises of a person;
Council
"Council" means the Council of the Corporation of
the Township of Oro;
(e)
(f)
Highway
"highway" includes a common and public highway,
street, avenue, parkway, driveway, square, place,
bridge, viaduct or trestle designed and intended
for, or used by, the general public for the
passage of vehicles;
(g)
Minister
"Minister" means the Minister of the Environment;
(h)
Ministry
"Ministry" means the Ministry of the Environment;
(i) Motor Vehicle
"motor vehicle" includes an automobile,
motorcycle, and any other vehicle propelled or
driven otherwise than by muscular power; but does
not include the cars of electric or steam
railways, or other motor vehicles running only
upon rails, or a motorized snow vehicle, traction
engine, farm tractor, self-propelled implement of
husbandry or road-building machine within the
meaning of The Highway Traffic Act;
(j) Motorized Conveyance
"motorized conveyance" means a conveyance
propelled or driven otherwise than by muscular,
gravitational or wind power;
(k) Municipality
"municipality" means the land within the
geographic limits of the Township of Oro;
(1) Noise
"noise" means unwanted sound;
(m) Point of Reception
"point of reception" means any point on the
premises of a person where sound or vibration
originating from other than those premises is
received;
(n) Publication
"Publication" means a specified publication of
the Noise Pollution Control Section of the
Pollution Control Branch of the Ministry of the
Environment, which is named in Schedule I; a copy
of every Publication which is named in Schedule I
is attached hereto and is hereby made part of
this by-law;
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(0) Stationary Source
"stationary source" means a source of sound which
does not normally move from place to place and
includes the premises of a person as one
stationary source, unless the dominant source of
sound on those premises is construction or a
conveyance.
(3) Zones
In this by-law,
(a) Residential Area
"Residential Area" means those areas of the
municipality specified as follows:
Lands within the following Villages: Shanty Bay,
Oro station, Edgar, Guthrie, Hawkestone, Dalston,
Rugby, Coulson and all lands within 500 meters of
the shores of Lake Simcoe and includes all lands
within the registered plans of subdivision
itemized on Schedule II attached hereto;
(c) Agricultural Area
"Agricultural Area" means those areas of the
municipality specified as follows:
All lands situate within the Municipality other
than as specifically indicated as being a
residential area or quiet zone.
2. GENERAL PROHIBITIONS
No person shall emit or cause or permit the emission of
sound resulting from an act listed herein, and which sound
is clearly audible at a point of reception:
1. Racing of any motorized conveyance.
2. The operation of a motor vehicle in such a way that
the tires squeal.
3. The operation of any combustion engine or pneumatic
device without an effective exhaust or intake muffling
device in good working order and in constant
operation.
4.
The operation of a vehicle or a vehicle with a trailer
resulting in banging, clanking, squealing or other
like sounds due to improperly secured loan or
equipment, or inadequate maintenance.
5.
The operation of an engine or motor in, or on, any
motor vehicle or item of attached auxiliary equipment
for a continuous period exceeding five minutes, while
such vehicle is stationary in a Residential Area or a
Quiet Zone unless:
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(a) the original equipment manufacturer specifically
recommends a longer idling period for normal and
efficient operation of the motor vehicle in which
case such recommended period shall not be
exceeded; or,
(b) operation of such engine or motor is essential to
a basic function of the vehicle or equipment,
including but not limited to, operation of ready-
mixed concrete trucks, lift platforms and refuse
compactors; or,
(c) weather conditions justify the use of heating or
refrigerating systems powered by the motor or
engine for the safety and welfare of the
operator, passengers or animals, or the
preservation of perishable cargo, and the vehicle
is stationary for purposes of delivery or
loading; or,
(d) prevailing low temperatures make longer idling
periods necessary immediately after starting the
motor or engine; or
(e) the idling is for the purpose of cleaning and
flushing the radiator and associated circulation
system for seasonal change of antifreeze,
cleaning of the fuel system, carburettor or the
like, when such work is performed other than for
profit.
6. The operation of a motor vehicle horn or other warning
device except where required or authorized by law or
in accordance with good safety practices.
7. The operation of any item of construction equipment in
a Quiet Zone, Residential Area or Agricultural Area
without effective muffling devices in good working
order and in constant operation.
3. PROHIBITIONS BY TIME AND PLACE
No person shall emit or cause or permit the emission of
sound resulting from any act listed in Table 3-1 if clearly
audible at a point of reception located in an area of the
municipality within a prohibited time shown for such an
area.
4. GENERAL LIMITATIONS ON SOUND LEVELS DUE TO STATIONARY
SOURCES
(1) No person shall emit or cause or permit the emission
of sound from a stationary source such that the level
of sound from that source at a point of reception
located in a Quiet Zone, Residential Area or
Agricultural Area, exceeds the applicable sound level
limit prescribed in publication NPC-105 stationary
Sources.
(2) Subsection (1) does not apply to any equipment,
apparatus or device used in agriculture for food crop
seeding, chemical spraying or harvesting.
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5. LIMITATION ON SOUND AND VIBRATION LEVELS AT A POINT OF
RECEPTION FOR SPECIFIC SOURCES
(1) Residential Air Conditioners
No person shall emit or cause or permit the emission
of sound from the operation of a residential air
conditioning device of a type referred to in
Publication NPC-116 - Residential Air Conditioners,
resulting in a sound level at a point of reception
located in a Quiet Zone, Residential Area or
Agricultural Area in excess of the applicable sound
level limit set out in Publications NPC-116 -
Residential Air Conditioners.
(2) Blastinq Operations
No person shall emit or cause or permit the emission
of sound (concussion) or vibration from a blasting
operation of a type mentioned in Publication NPC-119
Blasting, such that the peak pressure level or peak
particle velocity at a point of reception located in a
Quiet zone, Residential Area or Agricultural Area,
exceeds the applicable limit set out in Publication
NPC-119 - Blasting.
6. PREEMPTION
Where a source of sound is subject to both sections 4 and
5, the less restrictive provisions shall prevail.
7. SOUND EMISSION STANDARDS
(1) Construction Equipment - Residential Areas
No person shall emit or cause or permit the emission
of any sound from any item of construction equipment
of a type referred to in Publication NPC-115 -
Construction Equipment, at a work site, any part of
which is located in or within 600 meters of a
Residential Area or a Quiet Zone, unless:
(a) the item of equipment was manufactured prior to
January 1, 1979; or
(b) the item of equipment bears a label affixed by
the manufacturer or distributor which states, the
year of manufacture and that the item of
equipment when new, complied with the Residential
Area sound emission standards set out in
Publication NPC-115 - Construction Equipment, as
applicable to that type of equipment and date of
manufacture; or
(c) the owner, operator, manufacturer or distributor
provides proof that the item of equipment when
new, complied with the Residential Area sound
emission standards set out in Publication NPC-115
- Construction Equipment, as applicable to that
type of equipment and date of manufacture.
(2) Construction Equipment - Ouiet Zones
No person shall emit or cause or permit the emission
of any sound from any item of construction equipment
of a type referred to in publication NPC-115 -
Construction Equipment, at a work site, any part of
which is located in a Quiet Zone, unless:
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(a) the item of equipment bears a label affixed by
the manufacturer or distributor which states the
year of manufacture and that the item of
equipment when new complies with the Quiet Zone
sound emission standards set out in Publication
NPC-115 - Construction Equipment as applicable to
that type of equipment on date of manufacture; or
(b) the owner, operator, manufacturer or distributor
provides proof that the item of equipment when
new complied with the Quiet Zone sound emission
standards set out in Publication NPC-115 -
Construction Equipment, as applicable to that
type of equipment and date of manufacture.
(3) Domestic Outdoor Power Tools
No person shall emit or cause or permit the emission
of any sound in a Residential Area or Quiet Zone from
any domestic outdoor power tool of a type referred to
in Publication NPC-117 - Domestic Outdoor Power Tools,
which device is powered by an electric motor or an
internal combustion engine unless:
(a) the device was manufactured prior to January 1st,
1979; or
(b) the device bears a label affixed by the
manufacturer or distributor which states, the
year of manufacture and that the device when new,
complied with the sound emission standard set out
in Publication NPC-117 - Domestic Outdoor Power
Tools, as applicable to that type of device and
date of manufacture; or
(c) the owner, operator, manufacturer or distributor
provides proof that the device when new complied
with the sound emission standard set out in
Publication NPC-117 - Domestic Outdoor Power
Tools, as applicable to the type of device and
date of manufacture.
4. Air Conditioners
No person shall emit or cause or permit the emission
of any sound from any air conditioning device of a
type referred to in Publication NPC-116 - Residential
Air Conditioners unless:
(a) the device was manufactured prior to January 1st,
1979; or
(b) the device bears a label affixed by the
manufacturer or distributor which states, the
year of manufacture and that the device when new
complied with the sound emission standard set out
in Publication NPC-116 - Residential Air
Conditioners, as applicable to that type of
device and date of manufacture; or
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(c) the owner, operator, manufacturer or distributor
provides proof that the device when new complied
with the sound emission standard set out in
Publication NPC-116 - Residential Air
Conditioners as applicable to that type of air
conditioner and date of manufacture.
(5) Motorized Conveyances
No person shall emit or cause or permit the emission
of any sound from any motorized conveyance of a type
referred to in Publication NPC-118 - Motorized
Conveyances unless the motorized conveyance complies
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with the sound emission standard set out in
Publication NPC-118 - Motorized Conveyances, as
applicable to that type of motorized conveyance and
date of manufacture.
8. EXEMPTION
Public Safety
Notwithstanding any other provision of this by-law, it
shall be lawful to emit or cause or permit the emission of
sound or vibration in connection with emergency measures
undertaken:
(a) for the immediate health, safety or welfare of the
inhabitants or any of them; or
(b) for the preservation or restoration of property;
unless such sound or vibration is clearly of a longer
duration or nature more disturbing, than is reasonably
necessary for the accomplishment of such emergency purpose.
9. GRANT OF EXEMPTION BY COUNCIL
(1) A~~lication to Council
Notwithstanding anything contained in this by-law, any
person may make application to Council to be granted
an exemption from any of the provisions of this by-law
with respect to any source of sound or vibration for
which he might be prosecuted and Council, by
resolution, may refuse to grant any exemption or may
grant the exemption applied for or any exemption of
lesser effect and any exemption granted shall specify
the time period, not in excess of six months, during
which it is effective and may contain such terms and
conditions as Council sees fit.
(2) Details of A~plication for Exemption
The application mentioned in subsection (1) shall be
made in writing, in duplicate, and shall contain:
(a) the name and address of the applicant;
(b) a description of the source of sound or vibration
in respect of which exemption is sought;
(c) a statement of the particular provision or
provisions of the by-law from which exemption is
sought;
(d) the period of time, or duration not in excess of
six months, for which the exemption is sought;
(e) the reasons why the exemption should be granted;
(f) a statement of the steps, if any, planned or
presently being taken to bring about compliance
with the by-law; and
(g) proof of publication within the preceding ten
days, in a newspaper of general circulation
within the Municipality, of a notice of intention
to apply for an exemption to this by-law,
containing the information required by clauses
(a) through (e) hereof, and further stating the
date upon which it is intended that application
will be made to Council.
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(3) Noise Control Officer
Council shall cause one copy of the application for
exemption to be delivered to the Noise Control Officer
and he shall prepare a report to Council forthwith,
stating his opinion of the merits of the application
and his recommendations as to terms and conditions
which, in his opinion, should be imposed upon the
applicant if the exemption is granted and Council will
not consider the application for exemption until it
has received the report of the Noise Control Officer.
(4) Report
The Noise Control Officer shall forward a copy of his
report to the applicant at the address shown on the
application by prepaid registered mail and shall, not
sooner than two weeks after the mailing of the report
to the applicant, submit the report to Council and
shall, on request, make his report available for
public inspection.
(5) Decision
In deciding whether to grant the exemption, Council
shall consider the application, the report of the
Noise Control Officer and any written submission then
received by Council and made by the applicant after
receipt of the report of the Noise Control Officer and
the Council may consider such other matters as it sees
fit.
(6) Breach
Breach by the applicant of any of the terms or
conditions of the exemption shall render the exemption
null and void.
10. SEVERABILITY
If a court of competent jurisdiction should declare any
section or part of a section of this by-law to be invalid,
such section or part of a section shall not be construed as
having persuaded or influenced Council to pass the
remainder of the by-law and it is hereby declared that the
remainder of the by-law shall be valid and shall remain in
force.
11. PENALTY
Every person who contravenes any of the provisions of this
by-law is guilty of an offence and shall, upon conviction
thereof, forfeit and pay a penalty of not more than
$2,000.00 for a first offense or subsequent offenses,
exclusive of costs, and every such fine is recoverable
under the Provincial Offenses Act.
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12. REPEAL
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This by-law hereby repeals By-Law No. 90-66.
READ a first and second time this 7th day of 'August, 1990.
READ a third time and finally passed this 7th day of August,
1990.
OF ORO
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Aam1n1strator/Clerk, obert W. Small
This by-law is approved pursuant to the
provisions of the Environmental Protection
Act, 1980, as amended at Toronto, thiSl{W
day of "-\~ ' 199~'.;).. \?i
Minister
Q~ 0 .
of Envlron~t
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Publication NPC-lOl
Publication NPC-102
Publication NPC-l03
Publication NPC-104
Publication NPC-105
Publication NPC-106
Publication NPC-llS
Publication NPC-l16
Publication NPC-ll7
Publication NPC-118
Publication NPC-ll9
SCHEDULE I
Index of Publications
Technical Definitions
Instrumentation
Procedures
Sound Level Adjustments
Stationary Sources
Sound Levels of Road Traffic
Construction Equipment
Residential Air Conditioners
Domestic Outdoor Power Tools
Motorized Conveyances
Blasting
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TABLE 3-1
PROHIBITIONS BY TIME AND PLACE
PROHIBITED PERIOD OF TIME
RESIDENTIAL AREA
AGRICULTURAL AREA
3. The operation of a corn bust ion engine
which.
(i) is, or
(ii) is used in. or
( Hi) is intended for use in.
a toy or a mode 1 or rep 1 ica of any device,
which model or replica has no function
other than amusement and which is not a
conveyance.
At all times
At all times
At all times
C
1, The detonation of fireworks or exp losive
devices not used in construction.
A
2. The discharge of firearms.
B
4. The operation of any electronic device or
group of connected electronic devices
incorporating one or more loudspeakers
or other e 1 ectro- mechanica 1 transducers,
and intended for the production. repro-
duction or am pI ification of sound.
C'
B
5. The operation of any auditory signa 11 iog
device, inc 1 uding but not 1 imited to the
ringing of be 11 s or gongs and the b 1 ow ing
of horns or sirens or whist les. or the
production. reproduction or amp litication
of any similar sounds by electronic means
except where required or authorized by
law or in accor:lance with good safety
D & E
D & E
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6. The operation of any powered rail car
incl uding but not I imited to refrigera-
tion cars, locomotives or self-propelled
passenger cars, while stationary on
property not owned or contro lied by a
railway governed by the Canada Railway
Act.
7. The operation of any motorized conveyance
other than on a high way or other p I ace
intended for its operation.
8. The venting, re I ease or pressure re I ief of
air, steam or other gaseous mater ia I, pro-
duct or compound from any autoclave, boiler
pressure vesse I, pipe, va I ve, machine,
device or system.
9. Persistent barking, ca I ling or whining or
other similar persistent noise making
by any domestic pet or any other
animal kept or used for any pur-
pose other than agricu I ture.
10. The operation of a commercial car wash with
air drying equipment.
TABLE 3-1
PROHIBITIONS BY TIME AND PLACE
CONT'D
PROHIBITED PERIOD OF TIME
RESIDENTIAL AREA
AGRICULTURAL AREA
B
B
B
B
A
A
A
. A
D &: E
D Cz E
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TABLE 3-1
PROHIBITIONS BY TIME AND PLACE
CONT'D
PROHIBITED PERIOD OF TIME
RESIDENTIAL AREA
AGRICULTURAL AREA
11. Yelling, shouting, hooting, whistling or
singing.
A
A
12. The operation of a power assisted hang
glider or parafoi 1 .
D &. E
D & E
13. The operation of any item of snow making
equipment.
E
E
14. All selling or advertising by shouting or
outcry or amplified sound.
D &. E
D &. E
15. Loading, unloading, delivering, packing,
unpacking, or otherwise hand ling any con-
tainers, products, materia 1 s, or refuse,
whatsoever, un less necessary for the main-
tenance of essentia 1 services or the moving
of private household effects.
D &. E
D Cl E
16. The operation of any equipment in
connection with construction,
D & E
D & E
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TABLE 3-1
PROHIBITIONS BY TIME AND PLACE
CONT'D
PROHIBITED PERIOD OF TIME
RESIDENTIAL AREA
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AGRICULTURAL AREA
17. The operation or use of any too I for
domestic purposes other than sno\v remova I .
B
18. The operation of solid waste bulk lift or
refuse compacting equipment.
B
19. The operation of a commercial car wash of
a type other than mentioned in item 10.
A
Prohibited Periods of Time:
A - 23 00 one day to 07 00 next day (09 00 Sundays)
B - 19 00 one day to 07 00 next day (09 00 Sundays)
C . 17 00 one day to 07 00 next day (09 00 Sundays)
D - All day Sundays and Statutory Holidays
E - 19 00 one day to 07 00 next day
B
B
A
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SIMCOE
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Schedule 'A'
AREA AFFECTED BY
NOISE 'lJ'Y-LAW 90-66
LEGEND
500 METRE LIMIT FROM
LAKE SIMCOE SHORELINE
AREAS INCLUDED IN THIS BY-LAW
-
PLANS OF SUBDIVISION
COMMUNITIES AND AREAS
WITHIN 500 METRES
OF THE LAKE SIMCOE SHO
TOWNSHIP OF ORO
--
o 500 '000
SCALE
NOTE: AEGtSTERIED PLAN
2000
:JOOO, 4000
5000m
NPC- 1 01
Publication NPC-10l
Technical Definitions
--
1. Technical Terminology and Standards
The following terminology and standards shall be used for the
purposes of any Noise Control By-Law enacted pursuant to The Environ-
mental Protection Act and all Publications of the Noise Pollution
Control Section of the Pollution Control Branch of the Ministry of the
Environment. The definition of any technical word used in such By-Law
or this or any such Publication and not herein defined shall be the
definition appearing in the applicable Publication of the Canadian
Standards Association (CSA), the American National Standards Institute
(ANSI), the International Organization for Standardization (ISO), the
International Electrotechnical Commission (IEC), the Society of Automotive
Engineers (SAE), or the Machinery and Equipment Manufacturers Association
of Canada (MEMAC):
(1) . Acoustic Calibrator
An "Acoustic Calibrator" is an electro-mechanical or mechanical
device intended for the calibration of sound level meters and
meeting the specifications of Publication NPC-102
- Instrumentation, for Acoustic Calibrators.
(2) A-Weighting
"A-weighting" is the frequency weighting characteristic as
specified in IEC 123 or IEC 179 and intended to approximate
the relative sensitivity of the normal human ear to different
frequencies (pitches) of sound.
(3) A-weighted Sound Pressure Level
The "A-weighted sound pressure level" is the sound pressure
level modified by application of the A-weighting. It is
measured in decibels, A-weighted, and denoted dBA.
~
(4) Beating
"Beating" is the characteristic of a sound which has an audible
cyclically varying sound level, caused by the interaction of
two sounds of almost the same frequency.
(5) Buzzing Sounds
A "buzzing sound" is a sound which is characterized by the presence
of a large number of related discrete harmonics in its frequency
spectrum. These harmonics together with the fundamental frequency
produce a sound which subjectively is termed a "buzz". Examples
are sounds from a buzzer or a chain saw.
- 51 -
, NPC-10l
.
(6) Decibel
The "decibel" is a dimensionless measure of sound level or
sound pressure level; see sound pressure level.
(7)
Effective Sound Pressure
The "effective sound pressure" at a point is the root-mean
square value of the instantaneous sound pressure, over a
time interval, at the point under consideration as detected
with a sound level meter meeting the requirements of Publi-
cation NPC-102 - Instrumentation.
(8)
Equivalent Sound Level
The "equivalent sound level" sometimes denoted L ,is the
eq
value of the constant sound level which would result in
exposure to the same total A-weighted energy as would the
specified time-varying sound, if the constant sound level
persisted over an equal time interval. It is measured
in dBA.
The mathematical definition of equivalent'sound level (Leq) for
an interval defined as occupying the period between two points
in time tl and t2 is:
Leq = 10 10910 ~
t2-tl
t1 i1tl
tl p2
r
dt
where p(t) is the time varying A-weighted sound pressure and
p is the reference pressure of 20 ~Pa.
r
(9) Fast Response
"Fast response" is a dynamic characteristic setting of a sound
level meter meeting the applicable specifications of
Publication NPC-102 - Instrumentation.
(10) Frequency
The "frequency" of a periodic quantity is the number of times
that the quantity repeats itself in a unit interval of time.
The unit of measurement is hertz (Hz) which is the same as cycles
per second.
- 52 -
NPC-lOl
(11) General Purpose Sound Level Meter
A "General Purpose Sound Level Meter" is a sound level meter
which meets the specifications of Publication NPC-102 -
Instrumentation. for General Purpose Sound Level Meters.
(12) Impulse Response
"Impulse response" is a dynamic characteristic setting of a
sound level meter meeting the specifications of
Publication NPC-102 - Instrumentation. for Impulse Sound
Level Meters.
.
(13) Impulsive Sound
An "impulsive sound" is a single pressure pulse or a single
burst of pressure pulses. as defined by IEC 179A. First
supplement to IEC 179. Sections 3.1 and 3.2.
(14) Impu1 se Sound Level
The "impulse sound level" is the sound level of an impulsive
sound as measured with an Impulse Sound Level Meter set to
impulse response. It is measured in A-weighted decibels.
denoted dBAI.
(15) Impulse Sound Level Meter
An "Impulse Sound Level Meter" is a sound level meter which
meets the specifications of Publication NPC-102 - Instrumenta-
tion. for Impulse Sound Level Meters.
(16) Integrating Sound Level Meter
An "Integrating Sound Level Meter" is a sound level meter
which is capable of being used to derive the equivalent
sound level (Leq) and which meets the specifications of
Publication NPC-102 - Instrumentation. for Type B Integrating
Sound Level Meters.
(17) Logarithmic Mean Impulse Sound Level
The "Logarithmic Mean Impulse Sound Level". sometimes denoted LLM'
of N impulsive sounds. is ten times the logarithm to the base
10 of the arithmetic mean of ten to the power of one tenth the
impulse sound level of each impulsive sound.
Algebraically. it can be written as:
[ dBAI1/10 dBAI2/10 dBAIN/10]
L = 10 log 1 ( 1 0 + 10 .. . + 10 )
LM 1 0 N
where. dBAI1. dBAI2. ....dBAIN. are the N impulse sound levels.
- 53 -
, 'NPC-lOl
.
(18) Overpressure
The "overpressure" at a point due to an acoustic disturbance
is the instantaneous difference at that point between the peak
pressure during the disturbance and the ambient atmospheric
pressure. The unit of measurement is the pascal. One pascal,
abbreviated Pa, is the same as one newton per square metre,
abbreviated N/m2.
(19) Overpressure Level
The "overpressure level" is twenty times the logarithm to
the base 10 of the ratio of the peak pressure to the reference
pressure of 20 ~Pa.
(20) Peak Particle Velocity
The "peak particle velocity" is the maximum instantaneous
velocity experienced by the particles of a medium when
set into transient vibratory motion. This can be derived as
the magnitude of the vector sum of three orthogonal com-
ponents and is measured in cm/s.
(21) Peak Pressure level Detector
A "Peak Pressure level Detector" is a device capable of
measuring peak pressure or pressure level perturbations in air
and which meets the specifications of Publication NPC-102
- Instrumentation, for Peak Pressure level Detectors.
(22) Percentile Sound level
The "x percentile sound level", designated lx' is the sound
level exceeded x percent of a specified time period. It is
measured in dBA.
(23) Quasi-Steady Impulsive Sound
"Quasi-Steady Impulsive Sound" is a sequence of impulsive sounds
emitted from the same source, having a time interval of less
than 0.5 s between successive impulsive sounds.
(24) Slow Response
"Slow response" is a dynamic characteristic setting of a
sound level meter meeting the applicable specifications
of Publication NPC-102 - Instrumentation.
(25) Sound
"Sound" is an oscillation in pressure, stress, particle
displacement or particle velocity, in a medium with internal
forces (e.g. elastic, viscous), or the superposition of such
propagated oscillations, which may cause an auditory sensa-
tion.
- 54 -
NPC-101
(26) Sound Level
"Sound level" is the A-weighted sound pressure level.
(27) Sound Level Meter
A "sound level meter" is an instrument which is sensitive
to and calibrated for the measurement of sound.
:.
(28) Sound Pressure
The "sound pressure" is the instantaneous difference between
the actual pressure and the average or barometric pressure
at a given location. The unit of measurement is the micropasca1
( ~Pa) which is the same as a micronewton per square metre
( ~N/m2).
(29) Sound Pressure Level
The "sound pressure level" is twenty times the logarithm to
the base 10 of the ratio of the effective pressure (p) of a
sound to the reference pressure (Pr) of 20 ~Pa. Thus the
sound pressure level in dB = 20 10910 f .
r
(30) Tonality
A "tone" or a "tonal sound" is any sound which can be distinctly
identified through the sensation of pitch.
(31) Vibration
"Vibration" is a temporal and spatial oscillation of displacement,
velocity or acceleration in a solid medium.
(32) Vibration Velocity Detector
A "Vibration Velocity Detector" is a device which is capable
of measuring vibration velocity and which meets the specifications
of Publication NPC-102 - Instrumentation, for Vibration Velocity
Detectors.
- 55 -
NPC-102
Publication NPC-102
Instrumentation
.
!
1. Scope
This Publication sets out minimum specifications for equipment used
for the measurement of sound and vibration. For most of the speci-
fications the International Electrotechnical Commission (IEC) recommended
standards 123 (First edition 1961), 179 (Second edition 1973) and 179A
(First supplement to lEC 179, published 1973) have been adopted. In
some cases, these standards are amended or augmented for greater pre-
cision.
TABLE 102-1
NPC-102
Section
Type of Instrument
Application
9
Acoustic Calibrator
Non-impulsive
sounds
Impulsive sounds
Peak pressure
perturbati ons
Varying sounds of
low crest factor
Varying sounds of
high crest factor
Peak vibration
velocity in solids
Calibration of
sound level meters
3
General Purpose Sound Level Met~r
4
5
Impulse Sound Level Meter
Peak Pressure Level Detector
7
Type B Integrating Sound Level
Meter
Type A Integrating Sound Level
Meter
Vibration Velocity Detector
6
8
I
I
I
I
I
I
I
I
2. Technical Definitions
The technical terms used in this Publication are defined in the
specifications themselves or in Publication NPC-10l - Technical
Definitions.
- 57 -
""t=r
NPC-102
.
3. General Purpose Sound Level Meter
(l) Purpose
A General Purpose Sound Level Meter is a sound level meter
which is intended to be used for the measurement of non-
impulsive sounds, without significant A-weighted acoustic
energy above 2000 Hz.
(2) Specifications
A sound level meter which meets the following specifications
is a General Purpose Sound Level Meter:
(a) the sound level meter, including a microphone equip-
ped with a windscreen shall meet the specifications
of lEC 123, except that, in addition to meeting the
specifications of subclause 5.2 thereof, the micro-
phone of the sound level meter shall also meet the
specifications of subclause 5.2 amended by the sub-
stitution therein of an angle of incidence of ~300
instead of ~900, as it therein appears, and by the
substitution of Table 102-2 hereof instead of Table 1,
as it therein appears;
(b) the sound level meter shall incorporate A-weighting,
which is specified in lEG 123 as optional;
(c) the sound level meter shall have a minimum usable
range of sensitivity of from 40 dBA to 100 dBA and
it shall read to an accuracy of ~1.0 dB over that
range;
(d) a windscreen shall be installed on the microphone and
shall not affect by more than 1 dB the tolerance pre-
scribed in clauses (a) and (c);
(e) the sound level meter, including a microphone equipped with
a windscreen, shall, when operated in the presence of wind.
indicate a wind-induced sound level not in excess of the
relevant value listed in Table 102-3.
4. Impulse Sound Level Meter
(1 ) Purpose
An Impulse Sound Level Meter is a sound level meter which is
intended to be used for the measurement of any sounds, in-
cluding sounds for which a General Purpose Sound Level Meter
may be used.
(2) Specifications
A sound level meter which meets the following specifications
is an Impulse Sound Level Meter:
(a) the sound level meter, including a microphone equipped
with a windscreen, shall meet the specifications of a
General Purpose Sound Level Meter;
- 58 -
NPC-102
(b) the sound level meter, including a microphone equipped
with a windscreen, shall meet the specifications of
lEe 179 and lEe 179A, supplement to lEe 179, including
the optional characteristics mentioned in subclause
4.5 of lEe 179A;
(c) the sound level meter shall incorporate A-weighting
as specified in lEe 179.
.
5. Peak Pressure Level Detector
(1 ) Purpose
A Peak Pressure Level Detector is a sound level meter which
is intended to be used for the measurement of peak pressure
perturbations in air. The value indicated by this device is
not an average of the pressure level perturbations.
(2) Specifications
A sound level meter which meets the following specifications
is a Peak Pressure Level Detector (the features of this de-
vice are incorporated in an Impulse Sound Level Meter as
specified in section 4 above):
(a) the microphone of the sound level meter, when equipped
with a windscreen, shall perform within a tolerance of
~l dB throughout the frequency range of from 5 Hz to
31.5 Hz in the circumstances and conditions for use set
out in Table 1 of lEe 179;
(b) the sound level meter without the microphone shall be
capable of providing linear response as specified in
subclause 4.5 of lEe 179, within a tolerance of ~l dB
throughout the frequency range of from 5 Hz to 15 kHz;
(c) the sound level meter shall incorporate the optional
characteristics specified in subclause 4.5 of lEe 179A;
(d) the sound level meter shall meet the specifications
set out in lEe 179 clause 3, subclauses 4.1,4.2,4.4,
4.5, 4.7, 4.8, clause 5, subclauses 6.2, 6.3, 6.4, 6.5,
6.8,6.9, 7.1 through 7.9, 7.11,8.1,8.2,8.3,8.6 through
8.9, and the appropriate specifications of clause 10.
6. Type B Integrating Sound Level Meter
(1) Purpose
(a) An Integrating Sound Level Meter is a sound level meter
which is intended to be used for the measurement of sound over
a period of time, such that the equivalent sound level
(Leq) of the sound may be obtained.
(b) The Type B Integrating Sound Level Meter is specified with
sufficient dynamic range and measurement precision to measure
equivalent sound levels of general sounds that exceed
limitations set out in this by-law.
(c) Either a Type A or Type B Integrating Sound Level Meter may
be used for most such applications, but a Type A Integrating
Sound Level Meter must be used when the sound under study
- 59 _
~
NPG-102
-
is Quasi-Steady Impulsive Sound (see NPG-103 ~ Procedures, sections
3 and 4) or when the operational dynamic range greatly exceeds
40 dB.
(2) General Description
The tolerances specified for the microphone, weighting and
amplifier of a Type B Integrating Sound Level Meter are the
same as those specified for a General Purpose Sound Level
Meter in section 3 of this Publication. The computational
portions of the instrument must operate within a net accuracy of
tl dB for time periods of 20 minutes to one hour over a dynamic
range of at least 40 dB with test signals having a crest factor
(as defined in lEG 179A) up to 3. An operator-activated switch
is included to inhibit the integration function alone and, if the
system includes an elapsed-time clock, to inhibit both the integra~
tion and time summation functions.
(3) Specifications
A sound level meter which meets the following specifications
is a Type B Integrating Sound Level Meter:
(a) the instrument will generally be a combination of microphone,
amplifier, A-weighting network, computation circuit to
obtain the integral of the mean square A-weighted pressure,
display and a means of inhibiting the integration,
but may vary from the above provided that it performs the
same functions within the tolerances set out below;
(b) the instrument may include computational circuitry to calcu-
late and display the equivalent sound level directly;
(c) the microphone of the instrument shall meet the specifications
of clause 5 of lEG 123, except that, in addition to meet-
ing the specifications of subclause 5.2 thereof, the micro-
phone shall also meet the specifications of subclause 5.2
amended by the substitution therein of an angle of incidence
of t 300 instead of t 900, as it therein appears, and by
the substitution of Table 102-2 hereof instead of Table 1,
as it therein appears;
(d) a windscreen shall be installed on the microphone during
operation and shall not affect by more than 1 dB the
tolerance prescribed in clause (c);
(e) the sound level meter, including a microphone equipped with a
windscreen, shall, when operated in the presence of wind, in-
dicate a wind-induced sound level not in excess of the relevant
value listed in Table 102-3.
(f) the A-weighting network shall meet the specifications of
Table II and Figure I of IEC 123;
(g) the amplifier shall meet the specifications of subclauses
7.2, 7.3 and 7.11 of IEC 123;
- 60 -
NPC-102
(h) for each sensitivity setting of the instrument the amplifier
shall have a power handling capacity at least 10 dB greater
than the maximum sound level specified for that sensitivity
setting;
(i) if the computation circuit is of the sampling (digital) type,
when operating in conjunction with the microphone, windscreen,
A-weighting network and amplifier, it shall generate a signal
proportional to the mean square A-weighted pressure with a
1 !0.25 s exponential averaging time constant;
(j) the computation circuit shall integrate the mean square
A-weighted pressure and shall be capable of doing so on
each sensitivity setting for a minimum of 6 minutes at the
maximum sound level specified for that sensitivity setting;
(k) if the computation circuit is not capable of meeting the
specification of clause (j) with the reference therein to
"6 minutes" changed to "60 minutes", then the device shall
be provided with a means to indicate to the operator when
the integration capability has been exceeded;
(1) if the computational circuit is of the sampling (digital)
type, sampling shall take place at least twice per second;
(m) the computation circuit shall oper~te over the usable
dynamic range of the instrument with'a linearity of !l dB for
any sound with a ratio of peak pressure to root mean square
pressure up to 3 (crest factor up to 3);
(n) an operator-activated switch shall be provided to inhibit
integration or, if the instrument has an internal elapsed time
clock, to inhibit both integration and accumulation of
time;
(0) the combination of windscreen, microphone, A-weighting
network, amplifier and computation circuit shall have a
usable dynamic range extending at least from 50 dBA to
90 dBA and the manufacturer shall specify the usable
dynamic range;
(p) the instrument may be provided with more than one sensitivity
setting and the manufacturer shall specify the minimum and
maximum input sound level for each sensitivity setting;
(q) if the maximum sound level specified for any sensitivity
setting is less than 100 dBA, the system shall include a
means of indicating to the operator that the maximum input
sound level for that sensitivity setting has been exceeded
and such indication shall be maintained until cancelled by
the operator;
(r) the display shall indicate either,
(i) an output proportional to the integrated mean
square A-weighted pressure, or
(ii) the integrated mean square A-weighted pressure
divided by the duration of the period of time
for which the equivalent sound level is to be
determined, or
- 61 -
NPC-102
.
(iii) the equivalent sound level for the period of time
for which the equivalent sound level is to be
determined;
(s) it shall be possible to read from the display or to calculate
from the reading of the display, the equivalent sound level
to a resolution of tl dB over the usable dynamic range of
the instrument for integration times from 20 minutes to 60
minutes;
(t) if the indication of the display is as described in subclause
(ii) or (iii) of clause (r), the instrument shall include an
elapsed-time clock;
(u) the complete instrument shall follow the recommendations and meet
the specifications of subclauses 7.4, 7.5, 7.6, 7.7, 7.8 and
7.9 of IEC 123; and
(v) the instrument shall include a means of determining whether the
battery of the instrument if any, has sufficient life to permit
proper operation for a period of at least one hour.
7.
Type A Integrating Sound Level Meter
(1) Purpose
(a) An Integrating Sound Level Meter is'a sound level meter
which is intended to be used for the measurement of sound
over a period of time, such that the equivalent sound level
(Leq) of the sound may be obtained.
(b) The Type B Integrating Sound Level Meter is specified with
sufficient dynamic range and measurement precision to measure
equivalent sound levels of general sounds that exceed
limitations set out in this by-law.
(c) Either a Type A or a Type B Integrating Sound Level Meter may
be used for most such applications, but a Type A Integrating
Sound Level Meter must be used when the sound under study is
Quasi-Steady Impulsive Sound (see NPC-103 - Procedures,
Sections 3 and 4) or when the operational dynamic range
greatly exceeds 40 dB.
(2) General Description
The tolerances specified for the microphone, weighting and
amplifier of a Type A Integrating Sound Level Meter are the
same as those specified for a General Purpose Sound Level
Meter in section 3 of this Publication. The computational
portions of the instrument must operate within a net accuracy of
tl dB for time periods of 20 minutes to one hour over a dynamic
range of at least 80 dB with test signals having a crest factor
(as defined in IEC 179A) up to 5. An operator activated switch
is included to inhibit both the integration and time summation
functions.
- 62 -
r~pc- 1 02
(3) Specifications
A sound level meter which meets the following specifications
is a Type A Integrating Sound Level Meter:
(a) the sound level meter shall meet the specifications of a Type B
Integrating Sound Level Meter;
(b) the instrument shall be provided with an internal
elapsed-time clock;
(c) for each sensitivity setting of the instrument. the amplifer
shall have a power handling capacity at least 14 dB greater
than the maximum sound level specified for that sensitivity
setting;
(d) the computation circuit shall operate over the usable dynamic
range of the instrument with a linearity of il dB for any sound
with a ratio of peak pressure to root mean square pressure up
to 5 (Crest Factor up to 5); and
(e) the combination of windscreen. microphone. A-weighting network.
amplifier and computation circuit shall have a usable dynamic
range extending at least from 40 dBA to 120 dBA.
8. Vibration Velocity Detector
(1) Purpose
A Vibration Velocity Detector is a device' intended to be used
for the measurement of the peak particle velocity of a solid
surface.
(2) Specifications
A device which meets the following specifications is a Vibration
Velocity Detector:
(a) the device shall include either a transducer which res-
ponds to the total vibration vector or three transducers
which have their axes of maximum sensitivity mutually
orthogonal ilo;
(b) where three transducers are used to measure three mutually
orthogonal components of vibration. the response of
anyone of the transducers to vibration in the plane
normal to its axis of maximum sensitivity shall be less
than 10% of its response to the same vibration along its
axis of maximum sensitivity;
(c) the output of the device shall be proportional to the
velocity of the surface on which the transducer is. or
the transducers are. mounted and the output of the device
shall be in such form that the device indicates. or can
be used to calculate. the peak particle velocity in the
frequency range of from 5 Hz to 500 Hz over a range of peak
particle velocity of from 0.25 cmjs to 10 cmjs with a
tolerance of ilO%; and
- 63 -
NPC-102
(d) it shall be possible to field-calibrate the device with
an accuracy of t5% using either a reference electrical
signal in series with the equivalent transducer impedance
or a reference vibration source.
.
9. Acoustic Calibrator
(1) Purpose
An Acoustic Calibrator is an electro-mechanical or mechanical
device which produces sound of a known frequency and which,
when coupled to a sound level meter, produces a predictable
response in the sound level meter if the sound level meter is
operating properly at the calibration frequency.
(2) Specifications
A device, capable of producing sound, which meets the following
specifications is an Acoustic Calibrator:
(a) the device shall be capable of being physically attached
to a sound level meter in such a way that the device
and the sound level meter are "acoustically coupled",
that is, sound from the device is transmitted through
the air by way of a chamber formed by the attachment
of the device to the microphone of'the sound level meter;
(b) the device shall produce sound of a stated frequency,
within a frequency tolerance of t5%;
(c) the manufacturer of the device shall provide with the
device, any data required in order to determine the sound
level reading which should be indicated on the sound
level meter when calibrated for those microphone and
sound level meter types with which the manufacturer recommends
the device be used. Where additional accessories must be
used to provide this sound level reading, the manufacturer
shall state that they must be used;
(d) the maximum tolerance in the sound pressure level
generated by the device when coupled to the microphone
shall apply over an atmospheric pressure range of 87 kPa
to 107 kPa, and shall be to.5 dB over the temperature
range of from OOC to 400C and t1.0 dB over the temperature range
of from -100C to 500C;
(e) if the device is battery powered, means for checking
the battery condition shall be included with the device;
(f) the following data shall be provided with the device by
the manufacturer,
(i) the nominal sound pressure level produced,
(ii) the nominal frequency at which the device operates,
(iii)the ranges of temperature and atmospheric pressure
over which the device is intended to operate, and
the applicable overall sound pressure level tolerance
for these ranges.
- 64 -
NPC-102
TABLE 102-2
Permissible Tolerances on Microphone Sensitivity
Over an Angle of f 300
Frequency Hz
Permissible Tolerances dB
A* B**
31. 5 - 500 +1 +1
1000 f1 f1
2000 +2 + 1 - 2
4000 +4 + 1 - 4
8000 +10 + 1 - 10
* COLUMN A:
The microphone is mounted on the sound level meter.
** COLUMN B:
The microphone is physically separated from the sound
level meter but electrically connected thereto.
TABLE 102-3
Maximum Wind Induced Sound Level Indication Using A-weighting and
Slow Response (where available)
Wind Speed
dBA
15 km/h
20 km/h
25 km/h
41
48
53
- 65 -
, ,
NPC-103
Publication NPC-103
Procedures
1. Scope
This Publication comprises the various measurement procedures to be
used in connection with other Publications which provide limits or
standards for sound or vibration. Several of the procedures adopted
are those of nationally or internationally recognized agencies.
Table 103-1 lists the measurement procedures which are included in
this Publication.
TABLE 103- 1
NPC-103
Section Type of Measurement Procedure
3 Steady or impulsive sound Ministry
4 Varying sound Ministry
5 Sound and vibration from blasting Ministry
6 Powered mobile construction equipment SAE J88a
7 Pneumatic equipment t1EMAC
8 Small engines SAE J1046
9 Trucks with governed diesel engines CSA Zl07.22-M
2. Technical Definitions
The technical terms used in a procedure shall have the meaning given
either in that procedure or in Publication NPC-101 - Technical Definitions.
- 67 -
NPC-103
-
3. !Ocedure for ~1easurement of Steady or Impulsive Sound
(a) Classification
For the purposes of this procedure sounds can conveniently be
placed in four mutually exclusive categories as follows:
(i) impulsive sounds, other than Quasi-Steady Impulsive
Sounds, such as, but not limited to, the sound from
gunshots, certain explosive pest control devices
and certain industrial metal working operations
(e.g. forging, hammering, punching, stamping, cutting,
forming and moulding);
(ii) Quasi-Steady Impulsive Sounds, such as, but not limited
to, the sound from pavement breakers, riveting guns, in-
effectively muffled internal combustion engines or in-
effectively muffled air compressors;
(iii) buzzing sounds, such as, but not limited to, the sounds
from positive displacement blowers, chain saws, small
combustion engines and concrete finishers;
(iv) all other sounds.
(b) Application
This procedure applies to measurements at a point of reception
of:
(i) sound of a type mentioned in category (i) or (ii) of
clause (a); and
(ii) sound of a type mentioned in categories (iii)
or (iv) of clause (a), which is always higher than
the permissible level or which, when the sound is
present, does not vary in level over a range of more
than 6 dB during the period of observation.
(2) Instrumentation
(a) Sound Level Meter
(i) An Impulse Sound Level Meter shall be used for the measure-
ment of sound in category (i), (ii) or (iii) of clause
3(1) (a).
(ii) A General Purpose Sound Level Meter shall be used for the
measurement of sound in category (iv) of clause 3(1) (a).
NOTE: An Integrating Sound Level Meter may be used for
the measurement of sound in category (iv) of clause 3(1)
(a), but the procedure set out in section 4 - Procedure
for Measurement of Varying Sound must be used.
(b) Calibrator
An Acoustic Calibrator shall be used.
(c) Windscreen
A windscreen shall be used in all outdoor measurements.
- 68 -
NPC-103
(3) Measurement Location
For sound transmitted solely through air, the measurement
location shall be one or more of the following points of
reception:
(a) a location out-of-doors where a person may be
exposed to the sound; or
(b) the plane of an exterior door or window of a room
in which a person may be exposed to the sound, where
the door or window is open.
(4) Use of Instrumentation
(a) Battery Check
If the sound level meter is battery powered the condition
of the battery shall be checked after the meter has been
allowed to warm up and stabilize. The battery condition
shall be rechecked at least once per hour during a series
of measurements and at the conclusion of such measurements.
The meter shall not be used unless the battery condition is
confirmed to be within the range recommended by the manu-
facturer for proper operation.
(b) Calibration
The sound level meter shall be calibrated after the meter
has been allowed to warm up and stabiliz~ at least once
per hour during a series of measurements and at the conclu-
sion of such measurements.
(c) Sound Level Meter Settings
Measurements shall be taken using the following response
settings:
(i) Impulse Response (dBAI)
The impulse response and A-weighting shall be used
for impulsive sound in category (i) of clause 3 (l)(a).
An 'impulse hold' facility may be used if available on
the meter.
(ii) Slow Response (dBA)
The slow response and A-weighting shall be used for
sound in categories (ii), (iii) or (iv) of clause
3 (l)(a).
(d) Instrument Configuration
(i) Reflective Surfaces
The microphone shall be located not less than 1 m above
the ground, not less than 1 m from any sound reflective
surface except for the purposes of clause 3(3)(b)
and not less than arm's length from the body of the person
operating the meter. Not more than one person, other than
the operator of the meter, shall be within 7 m of the
microphone and that person shall be behind the operator
of the meter.
- 69 -
~ "
.
NPC-103
For the case of clause 3(3)(b) the microphone shall be
in the middle of the aperture located not less than
15 cm from the window frame or door frame.
(ii) Microphone Orientation
The microphone shall be oriented such that the sound to
be measured is incident at an angle recommended by the
microphone manufacturer for flattest frequency response
in a free field.
(e) Measurement - Slow Response
(i) Readings Taken
For sound in categories (ii), (iii) or (iv) of clause
3 (l)(a), a minimum of three observations with a minimum
observation time of 15 s each shall be made. The observed
average reading for each of the observations shall be
noted as well as the minimum and the maximum of the range
of sound levels during each observation period. If the
difference between any two observed average readings is
greater than 3 dB, a minimum of six observations shall
be made. For the purpose of adjustments for intermit-
tency the duration of the sound in anyone hour shall be
noted.
(ii) Readings Reported
The arithmetic mean of the observed average readings
shall be reported, rounded to the nearest decibel. Adjust-
ments for intermittence and quality of sound shall be
made in accordance with Publication NPC-104 - Sound Level
Adjustments, and the result shall be reported. The
result is the one hour equivalent sound level (Leq)
of the sound under study for anyone hour period
during which the readings were taken pursuant to
subclause (i).
(iii)Wide Variation of Sound Levels
If, in making observations pursuant to subclause (i),
there is a difference of more than 6 dB between the
lowest and highest values of the observed ranges of
sound levels, this procedure shall not be used unless
the lower limit of each such range is above the maximum
permissible level. Instead, the procedure set out in
Section 4 - Procedure for Measurement of Varying Sound
at a pOint of reception, shall be used.
- 70 -
NPC-103
r ,
(f) Measurement - Impulse Response - Frequent Impulses
(i) Readings Taken
For sound in category (i) of clause 3 (1) (a) not less
than 20 impulses shall be measured within a continuous
period of 20 minutes and each measurement taken shall
be reported.
(ii) Extension of Time
Where a minimum of 20 impulses cannot be measured within
a continuous period of 20 minutes pursuant to subclause
(i) the time period may be extended to 2 hours if an
impulse occurred in each of the four consecutive periods
of five minutes each during the initial 20 minute measure-
ment period.
(iii)Level Reported
The Logarithmic Mean Impulse Sound Level (LLM) of the
20 or more measurements shall be calculated and re-
ported to the nearest decibel. This Logarithmic Mean
Impulse Sound Level is a valid and effective sound
level for anyone hour period during which readings
were taken pursuant to subc1auses (i) and (ii).
(g) Measurement - Impulse Response - ~ing1e Event
Readings Taken and Reported
For impulsive sounds in category (i) of clause 3(1)(a), that
occur as single, seemingly independent events not normally
measurable using the procedure set out in clause (f) for
frequent impulses, each impulse shall be independently
measured and each impulse sound level reported to the
nearest decibel.
(h) Variation in Calibration
Measurements shall not be reported if the sound level
meter ca1ibr~tion has changed more than 0.5 dB from the
previous calibration.
(i) Weather Conditions
(i) Wind
Measurements shall not be taken unless the wind-induced
sound level is more than 10 dB below the measured levels.
Reference should be made to Publication NPC-102 - Instru-
mentation, particularly Table 102-3.
(ii) Humidity
Measurements shall not be taken if the relative humidity is
above the maximum for which the meter specification is
guaranteed by the manufacturer (normally 90%).
(iii)Precipitation
Measurements shall not be taken during precipitation.
(iv) Temperature
Measurements shall not be taken when the air temperature
is outside the range for which the specification of the
instrument is guaranteed by the manufacturer. (Normally,
only the lower temperature limit is significant.)
- 71 -
NPC-103
.
(5)
Documentation
The following represents the minimum information which shall be con-
tained in a report of an investigation where the above procedure
was used. (Adapted from CSA Zl07.2-l973 Methods for the Measurement
of Sound Pressure Levels.)
(a) Acoustic Environment
(i) Location and description of sound sources.
(ii) Dimensioned sketch including photographs, if possible,
of the location of the sound source and the point of
reception, showing all buildings, trees, structures
and any other sound reflective surfaces.
(iii)Physical and topographical description of the ground
surface.
(iv) Meteorological conditions prevailing at the time of
the investigation including approximate local wind
speed in km/h, wind direction, air temperature in oC,
approximate relative humidity and extent of cloud cover.
(b) Instrumentation
All the equipment used for making sound level measurements
shall be listed, including:
(i) type, model and serial number" of sound level meter;
(ii) type, model and serial number of microphone;
(iii)type, model and serial number of Acoustic Calibrator;
(iv) extension cables and additional amplifier, if used.
(c) Acoustical Data
The measurement details shall be described, including:
(i) the location of the microphone, using a sketch
if necessary;
(ii) measurements or readings obtained, preferably listed
in tabular form, referencing location on a sketch or map,
time periods involved, and relevant data required for
making calculations;
(iii)adjustments made for quality of sound or intermittence;
(iv) details of any calculations;
(v) comparison with applicable sound level limits, standards or
guidelines.
- 72 -
NPC-103
4. Procedure for Measurement of Varying Sound
(1) (a) Classification
For the purposes of this procedure sounds can conveniently
be placed in four mutually exclusive categories as follows:
(i) impulsive sounds, other than Quasi-Steady Impulsive
Sounds, such as, but not limited to, the sound
from gunshots, certain explosive pest control devices
and certain industrial metal working operations (e.g.
forging, hammering, punching, stamping, cutting, forming
and moulding);
(ii) Quasi-Steady Impulsive Sounds, such as, but not limited
t~ the sound from pavement breakers, riveting guns,
ineffectively muffled internal combustion engines or
ineffectively muffled air compressors;
(iii)buzzing sounds, such as, but not limited to the sound
from positive displacement blowers, chain saws, small
combustion engines and concrete finishers;
(iv) all other sounds.
(b) Application
This procedure applies to measure~nts at a pOint of reception
of continuous or intermittent sound'mentioned in category
(ii), (iii) or (iv) of clause (a).
(2) Instrumentation
(a) Integrating Sound Level Meter
An Integrating Sound Level Meter shall be used which is
appropriate for the sound to be measured:
(i) Either a Type A or Type B Integrating Sound Level Meter
may be used for the measurement of sound in category
(iv} of clause 4(1)(a);
(ii) A Type A Integrating Sound Level Meter shall be used for
the measurement of sound in categories (ii) or (iii)
of clause 4(1}(a).
(b) Calibrator
An Acoustic Calibrator shall be used.
(c) Windscreen
A windscreen shall be used in all outdoor measurements.
(3) Measurement Location
(a) Air-Borne Sound
For sound transmitted solely through air, the measurement
location shall be one or more of the following points of
reception:
(i) a location out-of-doors where a person may be exposed
to the sound; or
(ii) the plane of an exterior door or window of a room in
which a person may be exposed to the sound, where the
door or window is open.
- 73 -
NPC-103
.
(4) Use of Instrumentation
(a) Battery Check
If the Integrating Sound Level Meter uses a battery. the
condition of the battery shall be checked before each
measurement. and measurement shall not commence unless the
battery has sufficient life remaining to permit proper opera-
tion for a period of at least one hour.
(b) Calibration
The Integrating Sound Level Meter shall be calibrated before
and after each measurement period.
(c) Instrument Configuration
(i) Reflective Surfaces
The microphone shall be located not less than 1 m above
the ground. not less than 1 m from any sound re-
flective surface except for the purposes of subclause
4(3)(a)(ii) and not less than arm's length from the
body of the person operating the meter. Not more than
one person. other than the operator of the meter. shall
be within 7 m of the microphone and that person shall be
behind the operator of the ~ter. For the case of sub-
clause 4(3)(a)(ii) the micropnone shall be in the middle
of the aperture located not less than 15 cm from the
window frame or door frame.
(ii) Microphone Orientation
The microphone shall be oriented such that the sound to
be measured is incident at an angle recommended by the
microphone manufacturer for flattest frequency response
in a free field.
(d) Extraneous Sources
When measuring the sound from a source. integration shall
from time to time be inhibited by the operator immediately
when the received sound is dominated by sound from a source
other than the source under study and it shall remain inhibited
while such a condition persists and for at least 10 seconds
thereafter. While integration is inhibited the elapsed time
used to calculate the equivalent sound level shall not be
allowed to accumulate.
(e) Timing
If the Integrating Sound Level Meter is not provided with an
internal elapsed-time clock. the operator shall accumulate
the elapsed time during the measurement period by means of a
stop-watch or other time measuring device.
(f) Readings
(i) Stationary Source
When measuring the sound from a stationary source.
measurements to be used in calculating results shall be
taken during a continuous period not in excess of one
hour and. for purposes of calculation and reporting of
- 74 -
NPC-103
results, the accumulated elapsed time of measurement as
obtained in accordance with clause (d) is deemed to be
one hour if the accumulated time is 20 minutes or more.
Measurements containing information from an accumulated
time period of less than 20 minutes are insufficient
for purposes of calculating the equivalent sound level
(Leq) of a stationary source.
(ii) Road Traffic Noise Sources
When measuring the sound from road traffic the accumulated
elapsed time obtained in accordance with clause (d)
shall not be less than twenty minutes and the actual
accumulated elapsed time of measurement shall be
used for purposes of calculation.
(g) Adjustments
Adjustments for quality of sound shall be made in accordance
with Publication NPC-104 - Sound Level Adjustments and the
result reported. No adjustment shall be made for intermittence.
(h) Variation in Calibration
A measurement shall not be reported if the Integrating
Sound Level Meter calibration after the measurement period is
more than 0.5 dB different from that before the measurement
commenced.
(i) Weather Conditions
(i) Wind
Measurements shall not be made unless the wind-induced
sound level is more than 10 dB below the measured levels.
Reference should be made to Publication NPC-102-Instrumenta-
tion and particularly Table 102-3.
(ii) Humidity
Measurements shall not be taken if the relative humidity
is above the maximum for which the meter specification is
guaranteed by the manufacturer (normally 90%).
(iii)Precipitation
Measurements shall not be taken during precipitation.
(iv) Temperature
Measurements shall not be taken when the air temperature
is outside the range for which the specification of the
instrument is guaranteed by the manufacturer. (Normally,
only the lower temperature limit is significant.)
(j) Readings Reported
(i) For sound from a stationary source, the value to be
reported based on measurements made during the
accumulated elapsed time of 20 minutes or more and
the time period for calculation which is one hour
is, after adjustment in accordance with clause (g),
the one hour equivalent sound level (Leq) of the sound
under study for anyone hour period during which
measurements were taken pursuant to subclause 4(4)(f)(i).
- 75 -
NPC-103
-
(ii) For sound from road traffic, the value to be reported
based on measurements made during the accumu-
lated elapsed time of 20 minutes or more and the
time period for calculation which is the actual accumu-
lated elapsed time, is the one hour equivalent
sound level (Leq) of the sound under stuQr for any
one hour period during which measurements were
taken pursuant to subclause 4(4)(f){ii).
(iii)The one hour equivalent sound level (L ) shall be
eq
reported to the nearest decibel.
(5) Documentation
The following represents the minimum information which shall be contained
in a report of an investigation where the above procedure was used.
(Adapted from CSA Z107.2-l973 Methods for the Measurement of Sound
Pressure Levels.)
(a) Acoustic Environment
(i) Location and description of sound sources.
(ii) A list of the types of extraneous noise sources
which caused integration to be inhibited during
measurement.
{iii)Dimensioned sketch including photographs, if possible, of
the location of the sound source and the point of reception,
showing all buildings, trees, structures and any other
sound reflective surfaces.
(iv) Physical and topographical description of the ground surface.
(v) Meteorological conditions prevailing at the time of the
investigation including approximate local wind speed in km/h,
wind direction, air temperature in oC, approximate relative
humidity and extent of cloud cover.
(b) Instrumentation
All the equipment used for making sound level measurements shall
be listed, including:
(i) type, model and serial number of Integrating Sound Level
Meter;
(ii) type, model and serial number of microphone;
{iii)type, model and serial number of Acoustic Calibrator;
(iv) extension cables and additional amplifier, if used.
(c) Acoustical Data
The measurement details shall be described, including:
(i) the location of the microphone, using a sketch if
necessary;
(ii) the continuous time period of observation;
(iii)the accumulated elapsed time of measurement following
the procedure of clauses 4(4)(d) and (e);
- 76 -
NPC-103
(iv) the Integrating Sound Level Meter reading or output and
any other relevant data required for calculations;
(v) adjustments made for quality of sound;
(vi) details of all calculations;
(vii)the equivalent sound levels obtained, preferably listed
in tabular form, referencing location on a sketch or map;
{viii)comparision with applicable sound level limits, standards
or guidelines.
- 77 -
NPC-103
II
5. Procedure for Measurement of Sound and Vibration
Due to Blasting Operations
(1) Application
This procedure applies to the measurement of sound (concussion)
and vibration due to blasting operations.
(2) Sound
(a) Instrumentation
(i) Measuring Device
A Peak Pressure Level Detector shall be used.
(ii) Calibrator
An Acoustic Calibrator shall be used.
(i i i )Wi ndscreen
A windscreen shall be used in all outdoor measurements.
(b) 11easurement Location
The measurement location shall be at a point of reception
out-of-doors within 7 m of a building.
(c) Use of Instrumentation
(i) Battery Check
If the measuring device is battery powered, the con-
dition of the battery shall be checked after the de-
vice has been allowed to warm up and stabilize and
after each measurement has been made. The device
shall not be used unless the battery condition is con-
firmed to be within the range recommended by the
manufacturer for proper operation.
(ii) Calibration
The measuring device shall be calibrated after it
has been allowed to warm up and stabilize and after
each measurement has been made.
(iii)Meter Setting
The measuring device shall be set to read the peak
pressure level using linear response and a 'hold'
facility, if available.
(d) Instrument Configuration
(i) Reflective Surfaces
The microphone shall be located not less than 1 m
above the ground, not less than 1 m from any sound
reflective surface and not less than arm's length
from the body of the person operating the device. Not
more than one person, other than the operator of the
meter, shall be within 7 m of the microphone and that
person shall be behind the operator of the meter.
- 78 -
NPC-103
(ii) Microphone Orientation
The microphone shall be oriented such that the con-
cussion wave to be measured is incident at an angle
recommended by the microphone manufacturer for flattest
frequency response in a free field.
(e) Readings
(i) Peak Pressure Level
The value of peak pressure level reported shall be
given to the nearest decibel.
(ii) Variation in Calibration
A measurement shall not be reported if the meter
calibration after the measurement is more than 0.5
dB different from that before the measurement.
{iii)Battery Deterioration
A measurement shall not be reported if the battery
condition after the measurement is not within the
range recommended by the manufacturer for proper
operation.
(f) Weather Conditions
(i) Wind
Measurements shall not be report~d unless the wind-
induced sound pressure level is more than 10 dB
below the measured peak pressure level. Refer-
ence should be made to Publication NPC-102 - Instru-
mentation.
(ii) Humidity
Measurements shall not be taken if the relative humidity
is above the maximum for which the meter specification
is guaranteed by the manufacturer (normally 90%).
(iii)Precipitation
Measurements shall not be taken during precipitation.
(iv) Temperature
Measurements shall not be taken when the air tempera-
ture is outside the range for which the meter specifi-
cation is guaranteed by the manufacturer. (Normally
only the lower temperature limit is significant.)
(3) Vibration
(a) Instrumentation
(i) Measuring Device
A Vibration Velocity Detector shall be used.
(ii) Calibrator
An electrical reference signal of known voltage
and frequency shall be used in the field for cali-
bration of the Vibration Velocity Detector excluding
the transducer. A reference vibration source shall
be used for laboratory calibration of the complete
Vibration Velocity Detector.
- 79 -
NPC-103
-
(b) Measurement Location
Vibration measurements shall be made at a point of recep-
tion inside a building below grade or less than 1 m above
grade, preferably on a basement floor close to an outside
corner.
(c) Use of Instrumentation
(i) Battery Check
If the measuring device is battery powered, the con-
dition of the battery shall be checked after the
device has been allowed to warm up and stabilize and
after each measurement has been made. The device
shall not be used unless the battery condition is
confirmed to be within the range recommended by the
manufacturer for proper operation.
(ii) Calibration
Field calibration shall be carried out before and after
each measurement. Laboratory calibration of the complete
Vibration Velocity Detector as used in the field, including
the transducer, shall be carried out not less than once
per calendar year and the' results certified.
(d) Instrument Configuration
(i) Mounting
The transducer shall be affixed to a part of the
structure so as to prevent movement of the transducer
relative to the structure. The preferred structural
element is the basement floor as indicated in clause
(b) .
(ii) Transducer Orientation
If three vector components of vibration velocity are
recorded individually, it is preferable to orient the
transducers such that the three axes of measurement
are (a) vertical, (b) radial (along a horizontal line
joining the location of the blast to the location of
measurement) and, (c) transverse (along a horizontal
line at right angles to the line joining the location of
the blast to the location of measurement).
(e) Readings
(i) Peak Particle Velocity
The peak particle velocity in cm/s shall be reported.
(ii) Variation in Calibration
A measurement shall not be reported if calibration
after the measurement is more than 5% different
from that before the measurement.
- 80 -
NPC-103
~
(iii) Battery Deterioration
A measurement shall not be reported if the battery
condition after the measurement is not within the
range recommended by the manufacturer for proper
operation.
(4) Documentation
The following represents the minimum information which shall be
contained in a report of an investigation where the above
procedure was used.
(a) Description of Area
(i) location and description of the blasting operation.
(ii) Dimensioned sketch including photographs, if possible,
of the location of the blasting operation, the nearest
premises and the measurement location.
(iii)Description of the measurement location.
(iv) Physical and topographical description of the
ground surface.
(v) Meteorological conditions at the time of the investi-
gation, including approximate wind speed in km/h,
wind direction, air temperature in degrees Celsius,
approximate relative humidity, degree of cloud cover
and whether or not a condition ,of thermal inversion
prevailed.
(b) Instrumentation
All the equipment used for making sound and vibration
measurements shall be listed, including:
(i) type, model and serial number of Peak Pressure level
Detector;
(ii) type, model and serial number of microphone;
(iii)type, model and serial number of Acoustic Calibrator;
(iv) windscreen;
(v) extension cables and additional amplifiers, if used;
(vi) type, model and serial number of Vibration Velocity
Detector;
(vi i) type, model and serial number of transducers.
(viii) type, model and serial number of vibration calibrator.
(c) Sound and Vibration Data
The measurement details shall be described, including:
(i) the location where measurements were taken, the time
period involved and the orientation of instrumentation
using a sketch, if necessary;
(ii) details of all calculations;
(iii)the peak pressure level in dB and/or peak particle
velocity in cm/s;
(iv) comparison with applicable peak pressure limits and/or
peak particle velocity limits.
-
~
- 81 -
NPC-103
-
6.
Exterior Sound Levet Measurement Procedure For
Powered Mobile Construction Equipment - SAE J88a
SAE J88a Recommended Practice is adopted by the Ministry with the
following change:
Where ANSI Type 1 sound tevel meter specification is referred
to, reference shalt be made instead to Publication IEC-179 (1973)
for Precision sound level meters. (General Purpose Sound Levet
Meter)
7.
MEMAC Test Code For the Measurement of Sound
From Pneumatic Equipment
The ME MAC Test Code For The Measurement Of Sound From Pneumatic
Equipment is adopted by the Ministry with the following additional
requirement:
For measurement of percussive machines the sound level meter used
shall meet the specifications of IEC Publications 179 and t79A (1973).
(Impulse Sound Level Meter)
8. Exterior Sound Level Measurement Procedure For
Small Engine Powered Equipment - SAE J 1046
SAE J 1046 - Recommended Practice, is adopted by the Ministry with the
following changes:
(1) Where ANSI Type 1 sound level meter specification is referred
to, reference shall be made instead to IEC Publications 179
and 179A (1973). (Impulse Sound Levet Meter)
(2) Reptace clause 3.1.1 with the following:
The minimum dimensions of the measurement zone are defined as
a path of travet 1.2 m wide by 14 m long ptus an adjacent
area having the base along the edge of the path
of travel and the apex 7 m from the midpoint of the base.
(3) Replace Fig. t with Fig. 103-1, hereof.
(4) In section 3.3 Measurements, all references to 25 ft. shall
be changed to 7 m.
9. Procedure for Measurement of the Maximum Exterior Sound Level
of Stationary Trucks with Governed Diesel Engines-CSA Zl07.22-M1977
(1) CSA Zl07.22-M1977 standard is adopted by the Ministry with the
following change:
A General Purpose Sound Level Meter shall be used.
- 82 -
,
NPC-103
14m
7m
roun'MENl' pATH
R == 30 m ~ PAl)IUS
REf. US El?A 550/9-74-011
-' S:rrE <nIF!~cN roR ~ ""'" """" ~
p~ roR _ w:;INE ~ roJII""'! - s>E J 1046
FIG. 103-1
- 83 -
, .
NPC-104
Publication NPC-104
Sound Level Adjustments
1, Scope
This Publication refers to the adjustment of a sound level obtained
following the procedures set out in either section 3 or 4 of NPC-103
- Procedures.
2. Technical Definitions
The technical terms used in this Publication are defined in Publica-
tion NPC-10l - Technical Definitions.
3. Intermittence
If a sound is intermittent. the following adjustment shall be sub-
tracted from the observed value:
Adjustment =
1
10 10910 --x-
where x is the fraction of an hour
for which the sound persists.
Such sound level adjustments are approximated in Table 104-1.
4. Adjustment for Special Quality of Sound
(1) Tonality
If a sound has a pronounced audible tonal quality such as a
whine. screech. buzz. or hum then the observed value shall
be increased by 5.
(2) Cyclic Variations
If a sound has an audible cyclic variation in sound level
such as beating or other amplitude modulation then the
observed value shall be increased by 5.
(3) Quasi-Steady Impulsive Sound
If a sound is Quasi-Steady Impulsive Sound then the observed
value shall be increased by 10.
(4) One Adjustment Only
An adjustment may be made under one only of subsections (1). (2)
and (3). providing that. if subsection (3) applies. it shall be
used in preference to subsection (1) or subsection (2).
- 85 -
NPC-104
TABLE 104-1
Adjustment for Intermittence
Duration of Sound In One Hour
(Minutes)
Adjustment
"
40 - 60
20 - 39
10 - 19
5 - 9
3 - 4
1 - 2
less than
o
3
6
9
12
15
20
- 86 -
NPC-l05
Publication NPC-105
Stationary Sources
1. Scope
This Publication refers to sound level limits for sound from stationary
sources.
2. Technical Definitions
The technical terms used in this Publication are defined in Publication
NPC-10l - Technical Definitions.
3. Measurement Standards and Procedures
For the purposes of this Publication all measurements shall be made in
accordance with Publication NPC-103 - Procedures.
4. Sound Level Limits - General
(1) For impulsive sound, other than Quasi-Steady Impulsive Sound,
from a stationary source, if the sound level is expressed in
terms of the Logarithmic Mean Impulse Sound Level (LLM)' the
applicable sound level limit is the one hour equivalent sound
level (L ) caused by road traffic as'obtained pursuant to
eq
Publication NPC-106 - Sound Levels of Road Traffic, for that
point of reception and the same time.
(2) For sound from a stationary source, including Quasi-Steady
Impulsive Sound but not including other impulsive sound, if
the sound level is expressed in terms of the one hour equiva-
lent sound level (Leq), the applicable sound level limit is
the one hour equivalent sound level (Leq) caused by road traffic
as obtained pursuant to Publication NPC-106 - Sound Levels of
Road Traffic, for that point of reception and the same time.
5. Sound Level Limits - Specific Impulsive Sounds
(1) For impulsive sound, other than Quasi-Steady Impulsive Sound,
from a stationary source which is an industrial metal working
operation (including but not limited to forging, hammering,
punching, stamping, cutting, forming and moulding), if the sound
level at a point of reception is expressed in terms of the
Logarithmic Mean Impulse Sound Level (LLM)' the applicable sound
level limit for that stationary source if it was in operation before
January 1, 1980, is 60 dBAI, and otherwise is 50 dBAI.
- 87 -
HPC-105
It
(2) For impulsive sound. other than Quasi-Steady Impulsive Sound.
from a stationary source which is the discharge of firearms
on the premises of a licensed gun club. if the sound level at
a point of reception is expressed in terms of the Logarithmic
Mean Impulse Sound Level (LLM)' the applicable sound level limit for
that stationary source if it was in operation before January 1. 1980.
is 70 dBAI. and otherwise is 50 dBAI.
(3) For impulsive sound. other than Quasi-Steady Impulsive Sound,
from a stationary source. characterized by impulses which are
so infrequent that they cannot normally be measured using the
procedure mentioned in NPC-103 - Procedures. clause 3 (4)(f).
if the sound level is expressed in terms of the impulse sound
level. the applicable sound level limit is 100 dBAI.
6. Sound Level Limits - Pest Control Devices
(1) For impulsive sound. other than Quasi-Steady Impulsive Sound.
from a pest control device employed solely to protect growing
crops. if the sound level at a point of reception is expressed
in terms of the Logarithmic Mean Impulse Sound Level (lLM)'
the applicable sound level limit is 70 dBAI.
(2) For sound. including Quasi-Steady Impulsive Sound but not in-
cluding other impulsive sound. from a pest control device
employed solely to protect growing crops. if the sound level
at a point of reception is expressed in terms of the one hour
equivalent sound level (Leq), the applicable sound level limit
is 60 dBA.
(3) The operation of a pest control device outdoors is prohibited
during the hours of darkness.
7. Preemption
(1) For impulsive sound. other than Quasi-Steady Impulsive Sound.
if more than one sound level limit in sections 4. 5 and 6 is
applicable. the least restrictive applicable sound level
limit shall prevail.
(2) For sound. including Quasi-Steady Impulsive Sound but not in-
cluding other impulsive sound. if more than one sound level
limit in sections 4 and 6 is applicable, the less restrictive
applicable sound level limit shall prevail.
8. Exclusion
No restrictions apply to a stationary source resulting in an equiva-
lent sound level (Leq) of 40 dBA or less at a point of reception.
- 88 -
NPC-106
Publication NPC-106
Sound Levels of Road Traffic
1. Scope
This Publication describes methods to estimate the one hour equivalent
sound level (Leq) caused by sound from road traffic. It can be applied
in any community where the acoustical environment is dominated by the
sound, sometimes called "urban hum", of road traffic. Highly intrusive
transportation noise such as aircraft and railway noise is excluded
from the determination of this background noise.
2. Technical Definitions
The technical terms in this Publication are defined in Publication
NPC-10l - Technical Definitions.
3. Road Traffic Noise Derivation
When measurement of the sound level of a stationary source is made,
the equivalent sound level at the same point and the same time
from road traffic shall be obtained using one of three methods, which
are listed in order of preference, as follows:
(1) Measurement
The equivalent sound level of road trqffic may be measured
at the point of reception when the stationary source under
investigation is not audible, within one hour of the period
when sound from the stationary source was measured. The equivalent
sound level (L ) of road traffic is obtained in accordance
eq
with Publication NPC-103 - Procedures, section 4.
(2) Measurement and Calculation
The equivalent sound level (L ) may be determined at the point
eq
of reception for any hour when the stationary source under
investigation is operating and generating sound which, when
it is present, does not vary in level over a range of more than
6 dB during the period of observation. The equivalent sound
level (Leq) of road traffic and the equivalent sound level (Leq)
of the source are obtained simultaneously using two sound level
meters. One meter is used to measure the combined sound level
of source and road traffic, as if it constituted a stationary
source, in accordance with Publication NPC-103 - Procedures,
section 4. The second meter is used to measure the sound
level from the source only, in accordance with Publication
NPC-103 - Procedures, section 4. Use of these procedures requires
that operation of the second meter is inhibited at any time when
the sound from the stationary source is dominated by any other
sound, including the sound from road traffic. The equivalent sound
level (L ) of road traffic is the unknown component of the combined
eq
sound level. This unknown component is the logarithmic difference
between the combined sound level of source and road traffic and
the sound level of the source alone. It may be obtained with the
assistance of Table 106-1.
- 89 -
NPC-106
a
(3) Estimation
In any other case, the equivalent sound level (Leq) of the
road traffic is estimated on the basis of traffic flows observed
on the contributing roads during the period when the equivalent sound
level (leq) of the source is measured. This estimation is made in
accordance with sections 4 and 5. Where the surface of a contribu-
ting road is transversely grooved, this method of estimation should
not be used.
4. Estimation of Sound Level Based on Traffic
The following procedure describes the manner in which the equivalent
sound level of road traffic may be estimated on the basis of traffic
flows observed during a period of time for which the equivalent
sound level (L ) of the stationary source under investigation
eq
is measured. This method shall not be used when sound from
road traffic reflected from a building of more than three stories in
height, is clearly audible at the point of reception.
(1) For each road from which traffic is audible at the point of
reception estimate the equivalent sound level (Leq) at the
point of reception using the method specified in section 5.
(2) Add the equivalent sound levels from each road using the decibel
addition method in Table 106-1.
(3) Compare the resultant equivalent sound level (Leq) with the
Minimum Value for Hourly Leq for the relevant hour listed in
Table 106-2. The higher of the two values is the equivalent
sound level (Leq) of road traffic at the point of reception.
5. Road Noise Calculation
The following calculations shall be used to estimate the equivalent
sound level (leq) produced at a point of reception by traffic on
a road:
(l) Traffic Volume
Vehicles passing by on the road shall be counted for at least
20 minutes and the time interval of observation shall be noted.
The traffic volume reported in vehicles per hour is the number
of vehicles counted divided by the time interval as a fraction
of an hour.
(2) Percentage Trucks
The percentage of vehicles larger than vans or pickups shall
be calculated.
(3) Equivalent Sound Level at 30 m from Road Centre
Determination of the equivalent sound level at a point 30 m
from the centre line of the road shall be made using Tables
106-3, -4, -5, -6 and -7. If the total width of a multi-
lane road is less than 30 m then it shall be treated as one
road. Wider roads shall be treated as two or more roads.
- qn -
NPC-106
(4) Correction for Road Gradient
For road gradients of 1% or more. add the correction indicated
in Table 106-8 to the equivalent sound level (Leq).
(5) Correction for Interrupted Traffic Flow
For a point of reception within 150 m of a traffic light.
stop sign. or other interruption in traffic flow, add a
correction as indicated in Table 106-9 to the equivalent
sound level (Leq).
(6) Measurement of Distance
The distance of the point of reception from the centre of the
road shall be measured along the shortest line joining the
point of reception to the centre of the road.
(7) Correction for Distance
Table 106-10 shall be used to correct for distance and for
the type of ground surface.
(i) Water, all pavements, ice. hard packed gravel,
earth and snow are sound reflective surfaces. If more
than half of the ground surface between the centre
line of the road and the point of reception is sound
reflective, the distance correction shall be made
using the section of the Table for reflective surfaces.
(ii) If less than half of the surface between the centre
line of the road and the point of reception is sound
reflective, the total effective height above the ground
must be calculated by adding together the height of
the point of reception above the ground and the effect-
ive source height for the road traffic obtained from
Table 106-11. The correction for distance shall be
made using the section of Table 106-9 for "other
surfaces".
(B) Correction for Sheltering
If the point of reception is shielded from the road by solid
barriers, buildings or a row of houses in such a manner that
the total unobstructed angle of view of the road from the point
of reception is less than 900, subtract 5 from the value obtained
above.
(9) Correction for Grooving
Where the surface of the roadway is transversely grooved, this
method of estimating the sound level due to road traffic should
not be used.
- 91 -
NPC-106
TABLE 106-1
Adding and Subtracting Sound Levels
Difference between
higher and lower
measured sound levels
II
To obtain sum of two sound
levels add this correction
to measured higher value
Subtract this difference
from combined sound level
to obtain unknown
component.
o
0.5
1.0
1.5
2.0
2.5
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11. 0
12.0
13.0 and up
3.0
3.0
2.5
2.5
2.0
2.0
2.0
1.5
1.0
1.0
1.0
1.0
0.5
o
o
o
o
14.0
9.0
6.0
5.0
4.0
3.5
3.0
2.0
1.5
1.0
1.0
1.0
0.5
0.5
0.5
0.5
o
TABLE 106-2
Minimum Value for Hourly Leq
by Time of Day
Time of Day
07 00 - 19 00
19 00 - 20 00
20 00 - 21 00
21 00 - 22 00
22 00 - 23 00
23 00 - 24 00
24 00 - 01 00
01 00 - 02 00
02 00 - 03 00
03 00 - 04 00
04 00 - 05 00
05 00 - 06 00
06 00 - 07 00
Leq (dBA)
50
49
48
47
46
45
44
43
41
40
42
45
48
- 92 -
TABLE 106-3
NPC-106
Given the traffic volume in vehicles per hour and the percentage of vehicles larger
than vans or pickups, this Table provides the predicted one hour equivalent sound
level at 30 m from the centre line of a road with a speed limit greater than 35 km/h
and equal to or less than 50 km/h. For values of traffic volume not shown in the Table,
the nearest value in the Table shall be used.
L at 30 m; Speed Limit 35 - 50 km/h
eq
Percentage of Vehicles Larger than Vans or Pickups
Hourly up 1.1 3.1 5.1 7.6 11 14 19 24 30 40 53 70 90
Traffic to to to to to to to to to to to to to or
Volume 1.0 3.0 5.0 7.5 10 13 18 23 29 39 52 69 80 over
40 49 50 51 52 53 54 55 56 57 58 59 60 61 62
50 50 51 52 53 54 55 56 57 58 59 60 61 62 63
63 51 52 53 54 55 56 57 58 59 60 61 62 63 64
80 52 53 54 55 56 57 58 59 60 61 62 63 64 65
100 53 54 55 56 57 58 59 60 61 62 63 64 65 66
125 54 55 56 57 58 59 60 61 62 63 64 65 66 67
160 55 56 57 58 59 60 61 62 63 64 65 66 67 68
200 56 57 58 59 60 61 62 63 64 65 66 67 68 69
250 57 58 59 60 61 62 63 64 65 66 67 68 69 70
315 58 59 60 61 62 63 64 65 66 67 68 69 70 71
400 59 60 61 62 63 64 65 66 67 68 69 70 71 72
500 60 61 62 63 64 65 66 67 68 69 70 71 72 73
630 61 62 63 64 65 66 67 68 69 70 71 72 73 74
800 62 63 64 65 66 67 68 69 . 70 71 72 73 74 75
1000 63 64 65 66 67 68 69 70 71 72 73 74 75 76
1250 64 65 66 67 68 69 70 71 72 73 74 75 76 77
1600 65 66 67 68 69 70 71 72 73 74 75 76 77 78
2000 66 67 68 69 70 71 72 73 74 75 76 77 78 79
2500 67 68 69 70 71 72 73 74 75 76 77 78 79 80
3150 68 69 70 71 72 73 74 75 76 77 78 79 80 81
4000 69 70 71 72 73 74 75 76 77 78 79 80 81 82
5000 70 71 72 73 74 75 76 77 78 79 80 81 82 83
6300 71 72 73 74 75 76 77 78 79 80 81 82 83 84
8000 72 73 74 75 76 77 78 79 80 81 82 83 84 85
10000 73 74 75 76 77 78 79 80 81 82 83 84 85 86
- 93 -
II
NPC-106
TABLE 106-4
Given the traffic volume in vehicles per hour and the percentage of vehicles larger
than vans or pickups, this Table provides the predicted one hour equivalent sound
level at 30 rn from the centre line of a road with a speed limit greater than 50 km/h
and equal to or less than 65 km/h. For values of traffic volume not shown in the Table,
the nearest value in the Table shall be used.
L at 30 rn; Speed Limit 50 - 65 km/h
eq
Percentage of Vehicles Larger than Vans or Pickups
Hourly up 1.1 3.1 5.1 7.6 11 14 19 24 30 40 53 70 90
Traffic to to to to to to to to to to to to to or
Volume 1.0 3.0 5.0 7.5 10 13 18 23 29 39 52 69 80 over
40 51 52 53 54 55 55 56 57 58 59 60 61 62 63
50 52 53 54 55 56 56 57 58 59 60 61 62 63 64
63 53 54 55 56 57 57 58 59 60 61 62 63 64 65
80 54 55 56 57 58 58 59 60 61 62 63 64 65 66
100 55 56 57 58 59 59 60 61 62 63 64 65 66 67
125 56 57 58 59 60 60 61 62 63 64 65 66 67 68
160 57 58 59 60 61 61 62 63 64 65 66 67 68 69
200 58 59 60 61 62 62 63 64 65 66 67 68 69 70
250 59 60 61 62 63 63 64 65 66 67 68 69 70 71
315 60 61 62 63 64 64 65 "66 67 68 69 70 71 72
400 61 62 63 64 65 65 66 67 68 69 70 71 72 73
500 62 63 64 65 66 66 67 68 69 70 71 72 73 74
630 63 64 65 66 67 67 68 69 70 71 72 73 74 75
800 64 65 66 67 68 68 69 70 71 72 73 74 75 76
1000 65 66 67 68 69 69 70 71 72 73 74 75 76 77
1250 66 67 68 69 70 70 71 72 73 74 75 76 77 78
1600 67 68 69 70 71 71 72 73 74 75 76 77 78 79
2000 66 69 70 71 72 72 73 74 75 76 77 78 79 80
2500 69 70 71 72 73 73 74 75 76 77 78 79 80 81
3150 70 71 72 73 74 74 75 76 77 78 79 80 81 82
4000 71 72 73 74 75 75 76 77 78 79 80 81 82 83
5000 72 73 74 75 76 76 77 78 79 80 81 82 83 84
6300 73 74 75 76 77 77 78 79 80 81 82 83 84 85
8000 74 75 76 77 78 78 79 80 81 82 83 84 85 86
10000 75 76 77 78 79 79 80 81 82 83 84 85 86 87
- 94 -
Nf'C-l06
TABLE 106-5
Given the traffic volume in vehicles per hour and the percentage of vehicles larger
than vans or pickups, this Table provides the predicted one hour equivalent sound
level at 30 m from the centre line of a road with a speed limit greater than 65 km/h
and equal to or less than 75 km/h. For values of traffic volume not shown in the Table,
the nearest value in the Table shall be used.
L at 30 m; Speed Limit 65 - 75 km/h
eq
Percentage of Vehicles Larger than Vans or Pickups
Hourly up 1.1 3.1 5.1 7.6 11 14 19 24 30 40 53 70 90
Traffic to to to to to to to to to to to to to or
Volume 1.0 3.0 5.0 7.5 10 13 18 23 29 39 52 69 80 over
40 53 54 54 55 56 56 57 58 58 59 60 61 62 63
50 54 55 55 56 57 57 58 59 59 60 61 62 63 64
63 55 56 56 57 58 58 59 60 60 61 62 63 64 65
80 56 57 57 58 59 59 60 61 61 62 63 64 65 66
100 57 58 58 59 60 60 61 62 62 63 64 65 66 67
125 58 59 59 60 61 61 62 63 63 64 65 66 67 68
160 59 60 60 61 62 62 63 64 64 65 66 67 68 69
200 60 61 61 62 63 63 64 65 65 66 67 68 69 70
250 61 62 62 63 64 64 65 66 66 67 68 69 70 71
315 62 63 63 64 65 65 66 67 67 68 69 70 71 72
400 63 64 64 65 66 66 67 68 68 69 70 71 72 73
500 64 65 65 66 67 67 68 69 69 70 71 72 73 74
630 65 66 66 67 68 68 69 70 70 71 72 73 74 75
800 66 67 67 68 69 69 70 71 71 72 73 74 75 76
1000 67 68 68 69 70 70 71 72 72 73 74 75 76 77
1250 68 69 69 70 71 71 72 73 73 74 75 76 77 78
1600 69 70 70 71 72 72 73 74 74 75 76 77 78 79
2000 70 71 71 72 73 73 74 75 75 76 77 78 79 80
2500 71 72 72 73 74 74 75 76 76 77 78 79 80 81
3150 72 73 73 74 75 75 76 77 77 78 79 80 81 82
4000 73 74 74 75 76 76 77 78 78 79 80 81 82 83
5000 74 75 75 76 77 77 78 79 79 80 81 82 83 84
6300 75 76 76 77 78 78 79 80 80 81 82 83 84 85
8000 76 77 77 78 79 79 80 81 81 82 83 84 85 86
10000 77 78 78 79 80 80 81 82 82 83 84 85 86 87
- 95 -
-
NPC-106
TABLE 106-6
Given the traffic volume in vehicles per hour and the percentage of vehicles larger
than vans or pickups, this Table provides the predicted one hour equivalent sound
level at 30 m from the centre line of a road with a speed limit greater than 75 km/h
and equal to or less than 90 km/h. For values of traffic volume not shown in the Table,
the nearest value in the Table shall be used.
L at 30 m; Speed Limit 75 - 90 km/h
eq
Percentage of Vehicles Larger than Vans or Pickups
Hourly up 1.1 3.1 5.1 7.6 11 14 19 24 30 40 53 70 90
Traffic to to to to to to to to to to to to to or
Volume 1.0 3.0 5.0 7.5 10 13 18 23 29 39 52 69 80 over
40 55 55 56 56 57 57 58 59 59 60 61 62 63 64
50 56 56 57 57 58 58 59 60 60 61 62 63 64 65
63 57 57 58 58 59 59 60 61 61 62 63 64 65 66
80 58 58 59 59 60 60 61 62 62 63 64 65 66 67
100 59 59 60 60 61 61 62 63 63 64 65 66 67 68
125 60 60 61 61 62 62 63 64 64 65 66 67 68 69
160 61 61 62 62 63 63 64 65 65 66 67 68 69 70
200 62 62 63 63 64 64 65 66 66 67 68 69 70 71
250 63 63 64 64 65 65 66 67 67 68 69 70 71 72
315 64 64 65 65 66 66 67 68 68 69 70 71 72 73
400 65 65 66 66 67 67 68 69 69 70 71 72 73 74
500 66 66 67 67 68 68 69 70 70 71 72 73 74 75
630 67 67 68 68 69 69 70 71 71 72 73 74 75 76
800 68 68 69 69 70 70 71 72 72 73 74 75 76 77
1000 69 69 70 70 71 71 72 73 73 74 75 76 77 78
1250 70 70 71 71 72 72 73 74 74 75 76 77 78 79
1600 71 71 72 72 73 73 74 75 75 76 77 78 79 80
2000 72 72 73 73 74 74 75 76 76 77 78 79 80 81
2500 73 73 74 74 75 75 76 77 77 78 79 80 81 82
3150 74 74 75 75 76 76 77 78 78 79 80 81 82 83
4000 75 75 76 76 77 77 78 79 79 80 81 82 83 84
5000 76 76 77 77 78 78 79 80 80 81 82 83 84 85
6300 77 77 78 78 79 79 80 81 81 82 83 84 85 86
8000 78 78 79 79 80 80 81 82 82 83 84 85 86 87
10000 79 79 80 80 81 81 82 83 83 84 85 86 87 88
- 96 -
NPC-106
. '
TABLE 106-7
Given the traffic volume in vehicles per hour and the percentage of vehicles larger than
vans or pickups, this Table provides the predicted one hour equivalent sound level at 30 m
from the centre line of a road with a speed limit greater than 90 km/h. For values of
traffic volume not shown in the Table, the nearest values in the Table shall be used.
L at 30 m; Speed Limit above 90 km/h
eq
Percentage of Vehicles Larger than Vans or Pickups
Hourly up 1.1 3.1 5.1 7.6 11 14 19 24 30 40 53 70 90
Traffic to to to to to to to to to to to to to or
Volume 1.0 3.0 5.0 7.5 10 13 18 23 29 39 52 69 80 over
40 56 56 57 57 58 58 59 59 60 61 62 63 64 64
50 57 57 58 58 59 59 60 60 61 62 63 64 65 65
63 58 58 59 59 60 60 61 61 62 63 64 65 66 66
80 59 59 60 60 61 61 62 62 63 64 65 66 67 67
100 60 60 61 61 62 62 63 63 64 65 66 67 68 68
125 61 61 62 62 63 63 64 64 65 66 67 68 69 69
160 62 62 63 63 64 64 65 65 66 67 68 69 70 70
200 63 63 64 64 65 65 66 66 67 68 69 70 71 71
250 64 64 65 65 66 66 67 67 68 69 70 71 72 72
315 65 65 66 66 67 67 68 68 69 70 71 72 73 73
400 66 66 67 67 68 68 69 69 70 71 72 73 74 74
500 67 67 68 68 69 69 70 70 71 72 73 74 75 75
630 68 68 69 69 70 70 71 71 72 73 74 75 76 76
800 69 69 70 70 71 71 72 72 73 74 75 76 77 77
1000 70 70 71 71 72 72 73 73 74 75 76 77 78 78
1250 71 71 72 72 73 73 74 74 75 76 77 78 79 79
1600 72 72 73 73 74 74 75 75 76 77 78 79 80 80
2000 73 73 74 74 75 75 76 76 77 78 79 80 81 81
2500 74 74 75 75 76 76 77 77 78 79 80 81 82 82
3150 75 75 76 76 77 77 78 78 79 80 81 82 83 83
4000 76 76 77 77 78 78 79 79 80 81 82 83 84 84
5000 77 77 78 78 79 79 80 80 81 82 83 84 85 85
6300 78 78 79 79 80 80 81 81 82 83 84 85 86 86
8000 79 79 80 80 81 81 82 82 83 84 85 86 87 87
10000 80 80 81 81 82 82 83 83 84 85 86 87 88 88
- 97 -
-
"'-'
-
. ,
NPC-l06
TABLE 106-8
Correction to be Added for Road Gradient (dB)
Given the road gradient and the percentage of vehicles larger than vans or
pickups, this Table provides a correction to the predicted one hour equiva-
lent sound level (L ) representing the increased load imposed on heavy vehicles
eq
by a road gradient. For any intermediate value of percentage road gradient
not shown in the Table, the nearest value in the Table shall be used.
Gradient
Percentage of
Vehicles Larger 1% 2% 3% 4% 5%
than Vans or
Pickups
dB
0 - 7 0 1 1 1 2
8 - 12 1 1 2 2 3
13 - 17 1 1 2 3 3
18 or over 1 2 3 3 4
TABLE 106-9
Correction to be Added for Interrupted Traffic Flow (dB)
Distance (metres)
Point of Reception to Nearest Point of
Interrupted Traffic Flow
Percentage of 0 60.1 90.1 120.1
Vehicles Larger to to to to
than Vans or 60 90 120 150
Pickups
dB
o - 10 2 1 1 1
11- 22 3 2 2 1
83 or over 4 3 2 1
- 98 -
....
1.0 0
1.0 1'1"
....
o
TABLE 106-10
Correction to be Added to (+) or Subtracted from (-) the Equivalent Sound Level (L ) For
eq
Distance from Centre Line of Road to Point of Reception and for Total Effective Height Above Ground
~
r-
IT!
Total Effective Horizontal Distance (metres) from Centre Line of Road to Point of Reception
Height (metres)
Above Ground*
9 12 15 18 24 30 37 50 60 75 100 120 150 200 250 300 370 500
REFLECTIVE SURFACES
ALL HEIGHTS +5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12
OTHER SURFACES
54.1 and over +5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -11 -13 -15
43.1 - 54 +5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -6 -7 -8 -10 -12 -14 -16
34.1 - 43 +5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -6 -7 -9 -11 -13 -14 -17
27.1 - 34 +5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -6 -8 -10 -12 -14 -16 -18
21.1 - 27 +5 +4 +3 +2 +1 0 -1 -2 -3 -4 -5 -7 -9 -11 -13 -15 -17 -19
17.1 - 21 +5 +4 +3 +2 +1 0 -1 -2 -3 -4 -6 -8 -10 -12 -14 -16 -18 -20
14.1 - 17 +5 +4 +3 +2 +1 0 -1 -2 -3 -5 -7 -9 -11 -13 -15 -17 -18 -20
11.1 - 14 +5 +4 +3 +2 +1 0 -1 -2 -4 -6 -8 -10 -12 -14 -16 -17 -19 -21
8. 1 - 11 +5 +4 +3 +2 +1 0 -1 -3 -5 -7 -9 -11 -13 -15 -17 -18 -20 -21
7.1 - 8 +5 +4 +3 +2 +1 0 -2 -4 -6 -8 -10 -12 -14 -16 -17 -19 -20 -22
5.1 - 7 +5 +4 +3 +2 +1 -1 -3 -4 -7 -9 -11 -13 -14 -16 -18 -19 -20 -22
4.1 - 5 +5 +4 +3 +2 0 -2 -4 -6 -8 -10 -12 -14 -15 -17 -18 -20 -21 -23
2.1 - 4 +5 +4 +3 +1 0 -2 -4 -6 -9 -10 -12 -14 -16 -18 -19 -21 -22 -24
up to 2 +5 +4 +3 +1 -1 -3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -22 -23 -25
*Total Effective Height is the sum of the Effective Sourc~ Height (from Table 106-11) and the height of the point of
reception above the ground.
al No Baffler bl W,lh Barrier cl With Barner (depressed road)
ReceIVer
Source Receiver
T* 1*
,s
j'
-T *
,
Receiver
Source r ~ T _I *
T* t P r
IS~ /
Source
.*
S
z
"
("")
I
....
o
0'1
EffectIVe IOlaJ heJi]ht s.;- r
Effective 10ti\I nelght 5 t I I P , r
Effective total height = 5 + t + P + r
NPC-106
TABLE 106-11
Effective Source Height (metres) for Road Traffic
-
Percentage Speed Limit km/h
of Vehicles
La rger than 50 65 80 90 or grea ter
Vans or Pick-
ups: Source Hei ght (m)
up to 0.5 0.3 0.3 0.3 0.3
0.6 to 1. 5 1.2 1.0 0.6 0.6
1. 6 to 3.0 1.5 1.2 1.0 1.0
3.1 to 6.0 1.8 1.5 1.2 1.0
7 to 12 2.1 1.8 1.2 1.2
13 to 24 2.4 1.8 1.5 1.2
25 or over 2.4 2.1 1.5 1.5
- 100 -
"
Publication NPC-115
Construction Equipment
1 . Scope
This Publication sets sound emission standards for various items of
new construction equipment according to the date of manufacture
of the equipment.
2. Technical Definitions
The technical terms used in this Publication are defined in
Publication NPC-101 - Technical Definitions.
3. Sound Emission Standards
Tables 115-1 to 115-4 inclusive list Residential Area sound emission
standards and Quiet Zone sound emission standards for specific items
of new construction equipment measured in accordance with the pro-
cedures indicated.
T ABL E 11 5- 1
Quiet Zone and Residential Area Sound Emission Standards for
Excavation Equipment, Dozers, Loaders, Backhoes or
Other Equipment Capable of Being Used for
Similar Application
Maximum Sound Level as determined using
Publication NPC-103 - Procedures, section 6
dBA
Power Power
Rating Rating
Date of Manufacture Less than 75 kW 75 kW and larger
January 1, 1979 to 85 88
December 31, 1980
January 1, 1981 83 85
and after
- 101 -
NPC- 115
NPC-115
TABLE 115-2
Sound Emission Standards for Pneumatic Pavement Breakers
-
Standard Date of Maximum Sound Level as measured using
r~anufacture Publication NPC-l03 - Procedures, section 7
dBA
Quiet Zone Jan. 1, 1979 85
Sound Emission and after
Standard
Residential Jan. 1, 1979 90
Area Sound to Dec. 31 1980
Emission
Standard Jan. 1 , 1981 85
and after
TABLE 115-3
Sound Emission Standards for Portable Air Compressors
Standard Date of Maximum Sound Level as measured using
f~anufacture Publication NPC-103 - Procedures, section 7
dBA
Quiet Zone Jan. 1, 1979 76
Sound Emission to Dec. 31, 1980
Standard
Jan. 1, 1981 70
and after
Residential Jan. 1, 1979 76
Area and after
Sound Emission
Standard
- 102 -
, '
. .
NPC- 115
TABLE 115-4
Sound Emission Standard for Tracked Drills
Standard
Date of
Manufacture
Maximum Sound Level as measured
using Publication NPC-103
_ Procedures, section 6.
dBA
Quiet Zone
and Residential
Area
Sound Emission
Standard
Jan. 1, 1981
and after
100
- 103 -
~
.
*
.~
~
f
;
i
f
Publication NPC-116
.Residential Air Conditioners
NPC-116
1 . Scope
This Publication sets sound level .limits and sound emission standards
for residential air conditioning devices.
2. Technical Definitions
The technical terms used in this Publication are defined in Publi-
cation NPC-10l ~ Technical Definitions.
3. Sound Level Limits
Tabl~ 116-1 lists the sound .level limits for residential air
conditioning devices, where the sound level is measured in accord-
ance with the procedure set out in the Table.
TABLE 116-1
Sound Level Limits
Central Air Conditioning Devices
Date of Installation
L. (dBA)
eq
Before Jan. 1, 1980
Jan. 1, 1980 and after
50
45
Measurement Procedure
NPC-103 - Section 3
Procedure for 11easurement
of Steady or Impulsive Sound
Window or
Through-the-Wall Air Conditioning Devices
'"
Date of Installation
Leq (dBA).
Jan. 1, 1978 and a Her
, 50
- 1 05 -
Measurement Procedure
NPC-103 - Section 3
Procedure for t1easl,!remen t of
Steady or Impulsive Sound
. .
Publication NPC-117
Domestic Outdoor Power Tools
1. Scope
This Publication sets sound emission standards for various domestic
outdoor power tools.
2. Technical Definitions
The technical terms used in this Publication are defined in Publi-
cation NPC-101 - Technical Definitions.
3. Sound Emission Standards
Table 117-1 lists sound emission standards for walk-behind powered
lawn mowers measured according to the procedure indicated in the
Table.
TABLE 117-1
Sound Emission Standards for Walk-Behind Powered
Lawn Mowers
Date of Manufacture
Maximum Sound Level as Measured using
Publication NPC-103 - Procedures section 8
dBA
Jan. 1, 1979 to
Dec. 31, 1980
73
Jan. 1, 1981
and after
69
- 107 -
NPC- 117
\ .
.
--
'" .
..
NPC- 118
Publication NPC-118
Motorized Conveyances
1. Scope
This Publication sets sound emission standards for motorized conveyances
of various types.
2. Technical Definitions
(1) The technical terms used in this Publication are defined
in Publication NPC-10l - Technical Definitions.
(2) Definitions Specific to this Publication
Heavy Vehicle
"Heavy vehicle" means a motorized conveyance having a
registered gross weight of more than 4,500 kg.
3. Sound Emission Standards - Governed Diesel Engines
Table 118-1 lists for various years of manufacture, the sound emission
standard for a heavy vehicle powered by a governed diesel engine when
measured in accordance with the procedure set out in the Table.
TABLE 118-1
Sound Emission Standards for Heavy Vehicles
with Governed Diesel Engines
Date Maximum Sound Level as Measured Using
of Publication NPC-103 - Procedures,
Manufacture section 9
Prior to Jan. 1, 1979 100
Jan. 1, 1979 and after 95
4. Sound Emission Standards - Gasoline Engines
Table 118-2 lists for various years of manufacture, the sound emission
standard for a heavy vehicle powered by an ungoverned gasoline engine,
when measured in accordance with the procedure set out in the Table.
TABLE 118-2
UNDER PREPARATION
- 109 -
f'
, . " ,
Publication NPC-119
..
Blasting
1. Scope
This Publication refers to limits on sound (concussion) and vibration
due to blasting operations.
2. Technical Definitions
The technical terms used in this Publication are defined in Publication
NPC-10l - Technical Definitions.
3. Measurement Procedures
All measurements of peak pressure level and vibration velocity shall be
made in accordance with the "Procedure for ~1easurement of Sound and
Vibration due to Blasting Operations" set out in Publication NPC-103 -
Procedures. section 5.
4. Concussion - Cautionary Limit
Subject to section 5 the peak pressure level limit for con-
cussion resulting from blasting operations in a mine or quarry is
120 dB.
5. Concussion - Peak Pressure Level Limit
If the person in charge of a blasting operation carries out routine
monitoring of the peak pressure level, the peak pressure level
limit for concussion resulting from blasting operations in a mine
or quarry is 128 dB.
6. Vibration - Cautionary Limit
Subject to section 7, the peak particle velocity limit for vibra-
tion resulting from blasting operations in a mine or quarry is
1.00 cm/s.
7. Vibration - Peak Particle Velocity Limit
If the person in charge of a blasting operation carries out routine
monitoring of the vibration the peak particle velocity limit for
vibration resulting from blasting operations in a mine or quarry
is 1. 25 em/ s.
- 111 -
NPC- 119