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Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest
13 October 2021
2
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Housekeeping items
Mics on mute Cameras off
Raise your hand to indicate
you have a question or
write your question in the
chat
Wait to be called upon
before speaking
Please be polite and courteous
During the presentation
During the Q&A
3
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Speakers
Bertrand Comte
Manager, Environmental Affairs
Infrastructure Canada
Stéphane Lorrain
Director, Environment
Signature on the St. Lawrence (SSL)
Benoît Chamontin
Senior Communications Advisor
Infrastructure Canada
4
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Agenda
1. Background information
2. Technical solution (SSL)
3. Sound measurement results
4. Conclusion and next steps
5. Q&A
1
BACKGROUND
INFORMATION
6
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Project noise management
2016
Mitigation measures
developed by SSL –
Computer modelling
2012–2014
Environmental
assessment
2017–2019
5+ presentations to
residents by
Infrastructure Canada
and SSL
2019–2020
Noise barriers
installed in
sensitive areas
2020–2021
Sound measurements
conducted by
SSL and Infrastructure
Canada to
validate barriers’
effectiveness
7
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Environmental assessment
▪ Sensitive areas identified along the corridor:
– Residential areas, schools, parks susceptible to highway noise
– 300 m strip on either side of the highway
▪ Regular sound measurements
▪ Sound modelling (predictive modelling) to identify areas potentially in need
of SSL intervention
8
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Project sensitive areas
VERDUN
LE SUD-OUEST
9
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Noise measurement methodology
▪ Sources [French]:
– Guide méthodologique du Ministère des Transports
du Québec (MTQ) : Étude de pollution sonore pour
des infrastructures routières existantes – April 1989
– Politique sur le bruit routier du MTQ – March 1998
10
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Acoustic environment quality
Noise levels Noise discomfort levels
65 dBA ≤ Leq24h Loud
60 dBA Leq24h < 65 dBA Moderately Loud
55 dBA < Leq24h ≤ 60 dBA Moderate
Leq24h ≤ 55 dBA Acceptable
Source [French]: Étude de pollution sonore pour des infrastructures routières existantes – Méthodologie, April 1989 Source [French]:
https://www.bruitparif.fr/l-echelle-
des-decibels/
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Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
2 equal sound intensities
10 equal sound intensities
10 dBA difference between 2 sound
sources
Adding decibels
▪ The decibel scale is a logarithmic scale.
Therefore, sound is not added arithmetically.
Source [French]: https://www.bruitparif.fr/perception/
12
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Noise level and auditory perception
Increasing sound
level by
…is multiplying the
sound energy by
…and changing the auditory perception
3 dBA 2
Faintly
You can tell the difference when levels differ by 3 dBA, but you must
strain your ear.
5 dBA 3
Noticeably
You can notice an improvement or deteriotation in hearing when the
sound increases or decreases by 5 dB.
10 dBA 10 As if the sound was two times louder.
20 dBA 100
As if the sound were four times louder.
A change of 20 dB can wake you or distract your attention.
50 dBA 100 000
As if the sound were 30 times louder.
An abrupt change of 50 dB can startle you.
Source [French]: https://www.bruitparif.fr/perception/
13
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Contract requirements
▪ SSL performance requirement to comply with noise criteria during period
of operation (30 years)
▪ Corridor noise level monitoring at years 1, 5, and 10
▪ Criteria based solely on noise directly generated by the Samuel De
Champlain Bridge Corridor
14
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Noise criteria
The contract and the environmental assessment include noise criteria which
must be followed by SSL.
Criteria
(decibels, dBA)
Maximum noise level allowed
(decibels, dBA)
If the noise level of an area before the project started
was below 55 dBA
55 dBA
If the noise level of an area before the project
started was 55 dBA or between 55 dBA and 59 dBA
+1 dBA
If the noise level of an area before the project
started was greater than or equal to 60 dBA
60 dBA
15
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Sound measurement readings
▪ Unit of measurement: decibel (dBA)
▪ Instrument: professional calibrated
sound meter
▪ Noise level measured over a period
of 24 hours =
equivalent continuous sound
level during this period (LAeq)
Source [French]: https://www.bruitparif.fr/les-indicateurs-energetiques/
16
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Instrument and weather conditions
▪ Sound meter on tripod:
– 1.5 m (5’) above ground
– At least 3.5 m (~12’) away from houses
▪ Weather conditions:
– Dry (no rain or snow on the ground)
– Wind speed < 20 km/h
– Relative humidity between 5 and 90%
17
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Sound measurements
▪ Sound measurements carried out on a weekday to represent the most
common situation
▪ Measurement results filtered of noise other than the highway (local traffic,
trains, lawn mowers, etc.)
▪ Traffic counts to validate the noise prediction model
2
TECHNICAL
SOLUTION
(SSL)
19
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Computer modelling
▪ Mitigation measures designed by SSL using multi-factor (traffic, materials,
etc.) computer modelling
20
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Projected sound levels (SSL)
* 24-hour measurement
** Data based on environmental analysis conducted
before project started
Points
Before the
project started
Criteria Projected levels
LaSalle – La Poudrière sector
M4 66* 60 59
M5 64* 60 59
M-C1 66** 60 59
M-C2 65** 60 60
May Street area
M-C3 64** 60 58
M-C5 59** 60 57
M-C6 58** 59 57
M-C7 60** 60 58
Gaétan-Laberge sector
M3 62* 60 64
M-C4 60** 60 60
VERDUN
LE SUD-OUEST
21
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Noise barriers installation
▪ Improvements to May Street barriers (*)
by Infrastructure Canada and the City of
Montréal
H 2.5 m
L 75 m
H 2.5 m
L 170 m H 3.5 m
L 25 m
H 2 m
L 85 m
VERDUN
LE SUD-OUEST
H 3.5 m
L 25 m
H 3 m
L 40 m
H 3 m
L 140 m
H 3 m
L 140 m
*
*
*
*
Noise barriers height
Verdun / Le Sud-Ouest:
2−4 metres
3
SOUND
MEASUREMENT
RESULTS
23
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Sound measurements
▪ Conducted by SSL and INFC between September 2020 and September
2021 for all sensitive areas identified in Verdun, Le Sud-Ouest, L’Île-des-
Sœurs, and Brossard
▪ Several challenges affected the timing of the first measurements:
– Highway configuration completion (in both directions) for typical traffic
conditions
– Completion of noise barriers along the entirety of the Samuel De
Champlain Bridge Corridor
24
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Sound measurement results
Infrastructure Canada
55.8
VERDUN
LE SUD-OUEST
52.8
59.5
56.9
62.3
62.7
63.4
61.5
63.5
61.8
61.1
Level before
project started:
66 dBA
*
Noise level
< 60 dBA
∗ < 58 dBA
25
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Sound measurement results
Signature on the St. Lawrence
56
LE SUD-OUEST
56
57
62
63
59
Noise criteria
< 60 dBA
∗ < 58 dBA
Level
before project
started: 66 dBA
*
VERDUN
4
CONCLUSIONS
AND
NEXT STEPS
27
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Conclusions
▪ Similar noise levels measured by Infrastructure Canada and SSL
▪ Noise levels exceed compliance levels along Highway 15 between
LaSalle Boulevard and Wellington Street in Verdun
▪ Computer modelling review underway to determine appropriate
corrective measures
28
Virtual Public Information Meeting
Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021
Next steps
In progress
Review computer modelling
Develop corrective action plan
Approve plan
Identify areas in need of intervention
Present to
City of Montréal
Communicate with residents
Implement plan
Measure
noise levels
Establish work
schedule
5
QUESTIONS
www.samueldechamplainbridge.ca/contact-us/
514 360-8181
www.samueldechamplainbridge.ca
@SDeChamplainMTL
514 360-8181

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Virtual Public Information Meeting: Noise Barriers in Verdun / Le Sud-Ouest - 13 october 2021

  • 1. Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest 13 October 2021
  • 2. 2 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Housekeeping items Mics on mute Cameras off Raise your hand to indicate you have a question or write your question in the chat Wait to be called upon before speaking Please be polite and courteous During the presentation During the Q&A
  • 3. 3 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Speakers Bertrand Comte Manager, Environmental Affairs Infrastructure Canada Stéphane Lorrain Director, Environment Signature on the St. Lawrence (SSL) Benoît Chamontin Senior Communications Advisor Infrastructure Canada
  • 4. 4 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Agenda 1. Background information 2. Technical solution (SSL) 3. Sound measurement results 4. Conclusion and next steps 5. Q&A
  • 6. 6 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Project noise management 2016 Mitigation measures developed by SSL – Computer modelling 2012–2014 Environmental assessment 2017–2019 5+ presentations to residents by Infrastructure Canada and SSL 2019–2020 Noise barriers installed in sensitive areas 2020–2021 Sound measurements conducted by SSL and Infrastructure Canada to validate barriers’ effectiveness
  • 7. 7 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Environmental assessment ▪ Sensitive areas identified along the corridor: – Residential areas, schools, parks susceptible to highway noise – 300 m strip on either side of the highway ▪ Regular sound measurements ▪ Sound modelling (predictive modelling) to identify areas potentially in need of SSL intervention
  • 8. 8 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Project sensitive areas VERDUN LE SUD-OUEST
  • 9. 9 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Noise measurement methodology ▪ Sources [French]: – Guide méthodologique du Ministère des Transports du Québec (MTQ) : Étude de pollution sonore pour des infrastructures routières existantes – April 1989 – Politique sur le bruit routier du MTQ – March 1998
  • 10. 10 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Acoustic environment quality Noise levels Noise discomfort levels 65 dBA ≤ Leq24h Loud 60 dBA Leq24h < 65 dBA Moderately Loud 55 dBA < Leq24h ≤ 60 dBA Moderate Leq24h ≤ 55 dBA Acceptable Source [French]: Étude de pollution sonore pour des infrastructures routières existantes – Méthodologie, April 1989 Source [French]: https://www.bruitparif.fr/l-echelle- des-decibels/
  • 11. 11 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 2 equal sound intensities 10 equal sound intensities 10 dBA difference between 2 sound sources Adding decibels ▪ The decibel scale is a logarithmic scale. Therefore, sound is not added arithmetically. Source [French]: https://www.bruitparif.fr/perception/
  • 12. 12 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Noise level and auditory perception Increasing sound level by …is multiplying the sound energy by …and changing the auditory perception 3 dBA 2 Faintly You can tell the difference when levels differ by 3 dBA, but you must strain your ear. 5 dBA 3 Noticeably You can notice an improvement or deteriotation in hearing when the sound increases or decreases by 5 dB. 10 dBA 10 As if the sound was two times louder. 20 dBA 100 As if the sound were four times louder. A change of 20 dB can wake you or distract your attention. 50 dBA 100 000 As if the sound were 30 times louder. An abrupt change of 50 dB can startle you. Source [French]: https://www.bruitparif.fr/perception/
  • 13. 13 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Contract requirements ▪ SSL performance requirement to comply with noise criteria during period of operation (30 years) ▪ Corridor noise level monitoring at years 1, 5, and 10 ▪ Criteria based solely on noise directly generated by the Samuel De Champlain Bridge Corridor
  • 14. 14 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Noise criteria The contract and the environmental assessment include noise criteria which must be followed by SSL. Criteria (decibels, dBA) Maximum noise level allowed (decibels, dBA) If the noise level of an area before the project started was below 55 dBA 55 dBA If the noise level of an area before the project started was 55 dBA or between 55 dBA and 59 dBA +1 dBA If the noise level of an area before the project started was greater than or equal to 60 dBA 60 dBA
  • 15. 15 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Sound measurement readings ▪ Unit of measurement: decibel (dBA) ▪ Instrument: professional calibrated sound meter ▪ Noise level measured over a period of 24 hours = equivalent continuous sound level during this period (LAeq) Source [French]: https://www.bruitparif.fr/les-indicateurs-energetiques/
  • 16. 16 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Instrument and weather conditions ▪ Sound meter on tripod: – 1.5 m (5’) above ground – At least 3.5 m (~12’) away from houses ▪ Weather conditions: – Dry (no rain or snow on the ground) – Wind speed < 20 km/h – Relative humidity between 5 and 90%
  • 17. 17 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Sound measurements ▪ Sound measurements carried out on a weekday to represent the most common situation ▪ Measurement results filtered of noise other than the highway (local traffic, trains, lawn mowers, etc.) ▪ Traffic counts to validate the noise prediction model
  • 19. 19 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Computer modelling ▪ Mitigation measures designed by SSL using multi-factor (traffic, materials, etc.) computer modelling
  • 20. 20 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Projected sound levels (SSL) * 24-hour measurement ** Data based on environmental analysis conducted before project started Points Before the project started Criteria Projected levels LaSalle – La Poudrière sector M4 66* 60 59 M5 64* 60 59 M-C1 66** 60 59 M-C2 65** 60 60 May Street area M-C3 64** 60 58 M-C5 59** 60 57 M-C6 58** 59 57 M-C7 60** 60 58 Gaétan-Laberge sector M3 62* 60 64 M-C4 60** 60 60 VERDUN LE SUD-OUEST
  • 21. 21 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Noise barriers installation ▪ Improvements to May Street barriers (*) by Infrastructure Canada and the City of Montréal H 2.5 m L 75 m H 2.5 m L 170 m H 3.5 m L 25 m H 2 m L 85 m VERDUN LE SUD-OUEST H 3.5 m L 25 m H 3 m L 40 m H 3 m L 140 m H 3 m L 140 m * * * * Noise barriers height Verdun / Le Sud-Ouest: 2−4 metres
  • 23. 23 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Sound measurements ▪ Conducted by SSL and INFC between September 2020 and September 2021 for all sensitive areas identified in Verdun, Le Sud-Ouest, L’Île-des- Sœurs, and Brossard ▪ Several challenges affected the timing of the first measurements: – Highway configuration completion (in both directions) for typical traffic conditions – Completion of noise barriers along the entirety of the Samuel De Champlain Bridge Corridor
  • 24. 24 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Sound measurement results Infrastructure Canada 55.8 VERDUN LE SUD-OUEST 52.8 59.5 56.9 62.3 62.7 63.4 61.5 63.5 61.8 61.1 Level before project started: 66 dBA * Noise level < 60 dBA ∗ < 58 dBA
  • 25. 25 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Sound measurement results Signature on the St. Lawrence 56 LE SUD-OUEST 56 57 62 63 59 Noise criteria < 60 dBA ∗ < 58 dBA Level before project started: 66 dBA * VERDUN
  • 27. 27 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Conclusions ▪ Similar noise levels measured by Infrastructure Canada and SSL ▪ Noise levels exceed compliance levels along Highway 15 between LaSalle Boulevard and Wellington Street in Verdun ▪ Computer modelling review underway to determine appropriate corrective measures
  • 28. 28 Virtual Public Information Meeting Noise Barriers in Verdun / Le Sud-Ouest − 13 October 2021 Next steps In progress Review computer modelling Develop corrective action plan Approve plan Identify areas in need of intervention Present to City of Montréal Communicate with residents Implement plan Measure noise levels Establish work schedule