Virtual Public Information Meeting: Noise Barriers in Verdun / Le Sud-Ouest - 13 october 2021
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virtual public information meeting on October 13, 2021 organized by Signature on the St. Lawrence Group (SSL) and Infrastructure Canada regarding noise barriers for the Samuel De Champlain Bridge Corridor section along Highway 15 between Atwater Avenue and Gaétan-Laberge Boulevard. Agenda items: • Background information and noise compliance levels • Sound measurements conducted by SSL and Infrastructure Canada • Next steps • Q&A
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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