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Noise and Vibration - Environmental Impact Assessment Report

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Key Findings

Noise

  • The impact assessment assumed a worst-case approach to provide a conservative assessment of potential noise impacts.
  • During operations, the stations, maintenance storage facility, railway, and emergency exit buildings have the potential to generate noise at nearby sensitive receptors*.
  • Potential for exceedances will be addressed by implementing appropriate mitigation measures (see Potential Effects & Mitigation Measures) and through development and implementation of a plan to manage construction noise before construction begins.
  • Implementation of noise barriers along the joint corridor is anticipated to reduce noise compared to existing levels at most locations in the area.

* A sensitive receptor is a location that is sensitive to noise, where noise levels are assessed. Examples of these locations include living and sleeping quarters of residences, and sleeping quarters of noise sensitive institutional and commercial land uses such as hotels, hospitals, etc.

Vibration

  • The impact assessment assumed a worst-case approach to provide a conservative assessment of potential vibration impacts.
  • Operational vibration levels will be below perceptible levels, with implementation of readily-available mitigation measures.
  • Construction vibration will be carefully managed through development and implementation of site-specific management plans before construction begins.

Example of a construction noise monitor. Source: AECOM 2017

Example of a construction noise monitor.
Source: AECOM 2017

Four Seasons Centre of the Performing Arts.

Four Seasons Centre of the Performing Arts.
Source: Stantec 2021

Potential Effects & Mitigation Measures

Construction Noise

Potential Effects

  • Environmental noise may cause annoyance and disturb sleep.
  • Additional truck traffic accessing staging areas could cause sound level increases.

Operations Noise

Potential Effects

  • Environmental noise may cause disturbance and/or annoyance.
  • Airborne noise will result from the operations of the Project and may be a concern for noise sensitive areas.

Construction Noise

Mitigation Measures

  • Establishing and applying Project-specific construction noise criteria/exposure limits.
  • Keeping construction equipment in good working order and operate with effective muffling devices.
  • Use of localized noise barriers for specific equipment and operations.
  • Noise monitoring and regular reporting throughout the construction phase, as required.
    • Site-specific mitigation will be determined prior to the start of construction based on selected means and methods.
  • Develop a communications protocol for providing advanced notice of construction work and addressing public complaints in a timely manner.

Operations Noise

Mitigation Measures

  • Noise barriers of varying heights are required in a number of locations along the rail alignment to mitigate train noise.
  • As part of the future detailed design of the stations, comfort ventilation systems should be selected to comply with a maximum sound level limit of 60 dBA at 1 metre from all mechanical louvers and rooftop HVAC equipment.
  • Excess noise sources at the station are to be fitted with mitigation as required to meet Ministry of Environment, Conservation and Parks Noise Pollution Control 300 criteria.
  • Outdoor audio paging system, transformers, and generators will be required to meet Ministry of Environment, Conservation and Parks Noise Pollution Control 300 noise limits at adjacent receptors, and the system will be designed to do so by limiting speaker volume and positioning speakers away from neighbouring residences.

The maintenance and storage facility doors will remain closed (a central colling system may be required in the garage area) and/or a sound-reducing vestibule will be constructed around the door openings.

Potential Effects & Mitigation Measures

Construction Vibration

Potential Effects

  • Vibration from tunneling can cause annoyance, interfere with human activities, and interfere with vibration-sensitive equipment operations.
  • The highest levels of construction ground-borne vibration are expected to be associated with compaction with a vibration roller, truck activities in staging areas, and operation of the tunnel boring machine.
  • Without mitigation, vibration may cause damage to buildings, utilities, and other structures during construction.

Operations Vibration

Potential Effects

  • Vibration levels are anticipated to be low and not cause structural damage.
  • Vibration impacts were predicted at seventy-one (71) representative points along the entire alignment, to inform development of site-specific mitigation measures.

Construction Vibration

Mitigation Measures

  • Maintain the setback distances for construction equipment.
  • Site-specific mitigation will be determined prior to the start of construction based on selected means and methods.
  • Develop a communications protocol for providing advanced notice of construction work and addressing public complaints in a timely manner.
  • Vibration measurements will be assessed using mock-up construction activities prior to construction at certain receptor locations (i.e., St. Michael’s Hospital, Bell Media Headquarters, Four Seasons Centre for the Performing Arts).

Operations Vibration

Mitigation Measures

  • Consider equipment with low vibration levels.
  • Site-specific mitigation will be determined prior to the start of operations based on selected means and methods
  • Develop a communications protocol for providing advance notice of construction work and addressing public complaints in a timely manner.

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Submissions are closed.