Noise during construction
How noise is measured
Sound intensity is measured in decibels or adjusted decibels (dB or dBA). This is a logarithmic scale. For example, an increase of 3 dBA is only slightly perceptible to the human ear, while an increase of 10 dBA is perceived as twice the initial noise level.
|0 dBA||40 dBA||60 dBA||80 dBA||140 dBA|
|Threshold of audible sound||Quiet room||Normal conversation||Conversation is difficult; very loud||Intolerable sound level (e.g. jet take-off at < 30 m)|
Known sounds in our environment and dBA levels
How is the impact of sound during construction measured?
During the construction phase, some work may generate noise. NouvLR, the consortium in charge of building the REM, is required to comply with noise management requirements.
Here are the noise thresholds to comply with, based on the type of work done:
Fixed site work (construction of stations and related infrastructure)
|Daytime (7 am to 7 pm)
Average over a 12-hour period
|Evening (7 p.m. to 10 p.m.)
Average over a 1 hour period
|Night (10 pm to 7 am)
Average over a 1 hour period
|55 dBA or pre-work ambient noise||55 dBA or pre-work ambient noise||45 dBA or pre-work ambient noise|
Linear works (construction of railway and road axes)
|Noise criteria (in dBA)|
|Zone and land use||Day (7 a.m. to 7 p.m.)||Evening (7 p.m. to 11 p.m.)||Night (11 p.m. to 7 a.m.)|
|Criterion (L10, 30 min, dBA)||Maximum peak (LAFmax)||Criterion (L10, 30 min, dBA)||Maximum peak (LAFmax)||Criterion (L10, 30 min, dBA)||Maximum peak (LAFmax)|
|Noise sensitive zones||75 or ambient noise +5||85 or 90 pour un bruit d'impact||Ambient noise + 5||85||Ambient noise + 5 (if ambient noise smaller than 70) or Ambient noise + 3 (if ambient noise greater than 70)||80|
|Commercial zones||80 or ambient noise + 5||None||Ambient noise + 5||None||None||None|
|Industrial zone||85 or ambient noise + 5||None||None||None||None||None|
The REM project office and NouvLR are implementing measures to minimize noise during the work. These measures are adjusted continuously based on the work done and the sectors. Here are some examples:
- Using silencers on equipment
- Using temporary acoustic barriers
- Continuously raising workers’ awareness
- Noise monitoring and follow-up program, including a team of dedicated supervisors
- A rigorous complaint management procedure
Want to find out more about noise?
Air quality during construction
How is the impact of air quality during construction measured?
The work is subject to standards regarding total particles and fine particles (PM2.5) set forth in the Clean Air Regulation. The standards are 120 µg/m3 over 24 hours for total particles, and 30 µg/m3 over 24 hours for fine particles.
Mitigation measures are planned to limit the spread of dust, including:
- Using a dust suppressant
- Cleaning up public roads
- Using tarps on dump trucks and material piles
Vibrations during construction
During the construction phase, some work may generate vibrations, primarily:
- Controlled blasting operations
- Heavy machinery traffic
- Pile driving or installation of piers
NouvLR, the consortium in charge of building the REM, is required to comply with vibration thresholds. These thresholds aim to ensure the integrity of the surrounding structures.
Before beginning the work, NouvLR identifies the buildings and infrastructure in the construction zone. Inspections are done and work methods are selected to minimize the transmission of vibrations to the ground.
In sensitive areas, measurements will also be done before construction work begins, so as to determine the level of ambient vibration.
Tight control of vibrations is ensured during the work, which means:
- Using seismographs positioned at the borders of the construction zone
- Analyzing results in real time and immediately adjusting work methods as required
Want to find out more about vibrations?
Live data from the construction sites
Consult the noise and air quality data of the REM under construction, updated every 48 hours.