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Noise and Vibration - Lower Don Bridge and Don Yard

← Return to Early Works: Lower Don Bridge and Don Yard Draft Report

Key Findings

Construction Noise

  • The impact assessment conservatively assumed that all construction equipment would operate in a small work area closest to each sensitive receiver* instead of being spread throughout the project footprint.
  • Without mitigation, there is potential for noise criteria exceedances at the future residential developments at 125/131 Mill Street, 180-190 Mill Street and 495 Front Street East.
  • Potential for exceedances will be reduced 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.

* A sensitive receiver is a location that is sensitive to noise, where noise is assessed. These locations include living and sleeping quarters of residences, and sleeping quarters of noise sensitive institutional/commercial land uses (e.g., hotel, hospital, etc.).

Construction Vibration

  • The impact assessment employed a conservative approach, where construction equipment was assumed to operate at the edge of the project footprint, closest to sensitive receivers.
  • Without mitigation, there is potential for vibration criteria exceedances at 21 Don Roadway, 11 Sunlight Park Road, and 70 Distillery Lane.
  • No impacts to the Cherry Street Interlocking Tower as a result of construction vibration are anticipated. The Cherry Street Interlocking Tower, a railway structure, was built in its present location to withstand vibration; however, the design vibration limits should be reviewed by a qualified specialist during the next phases of design.
  • Potential for exceedances will be reduced by implementing appropriate mitigation measures (see Potential Effects & Mitigation Measures) and through development and implementation of a plan to manage construction vibration before construction begins.

Potential Effects & Mitigation Measures

Construction Noise

Potential Effects:

  • Without mitigation, potential for noise level criteria exceedances at 180-190 Mill Street and the future residential developments at 125/131 Mill Street and 495 Front Street.

Mitigation Measures:

  • Establish and apply project-specific construction noise criteria/exposure limit.
  • Use construction equipment compliant with noise level specifications in the Ministry of the Environment, Conservation and Parks’ NPC-115 and NPC-118 guidelines.
  • Keep equipment in good working order and operate with effective muffling devices.
  • Evaluate acoustic equipment enclosures for equipment such as compressors and generators.
  • Use of upgraded construction hoarding (considering requirements from CSA Z107.9 for noise barriers) between construction equipment and noise sensitive receivers.
  • Use of localized noise barriers for specific equipment and operations, including on corridor construction works.
  • Reduce simultaneous operation of equipment where possible.
  • Implement a no idling policy on site (unless necessary for equipment operation).
  • Restrict construction hours where possible:
    • Perform construction during daytime hours where possible. If nighttime construction is necessary, activities with the highest noise levels should be conducted during day time periods.
    • If construction will occur outside of normal daytime hours, inform local residents of type of construction and expected duration prior to commencing work.
  • Undertake noise monitoring and regular reporting throughout the construction phase as required.
  • Develop a communications protocol for providing advance construction and vibration impact notices and addressing public complaints in a timely manner.

Example of a construction noise logger. Source: AECOM, 2017.

Example of a construction noise logger.
Source: AECOM, 2017.

Construction Vibration

Potential Effects:

  • Exposure to vibration may result in public annoyance and complaints. Vibration may also cause damage to buildings and other structures.

Mitigation Measures:

  • Utilize equipment with low vibration emissions where possible.
  • Conduct off-site construction of components away from sensitive areas where possible.
  • Operate construction equipment on lower vibration settings where available.
  • Provide smooth surfaces for trucks to travel.
  • Maximize distance between equipment and sensitive receivers.
  • Restrict construction hours where possible:
    • Perform construction during daytime hours. If nighttime construction is necessary, the activities with the highest vibration levels should be conducted during day time periods.
    • If construction will occur outside of normal daytime hours, inform local residents in advance, describing type of construction and expected duration.
  • Use alternative construction methods and/or equipment with lower vibration emissions or power settings, where City of Toronto prohibited limits are predicted to be exceeded.
  • Conduct monitoring and pre-construction inspections in accordance with City of Toronto Bylaw 514 as required.
  • Develop a communications protocol for providing advance construction noise and vibration impact notices and addressing public complaints in a timely manner.

Example of a construction vibration monitor. Source: AECOM, 2020

Example of a construction vibration monitor.
Source: AECOM, 2020

← Return to Early Works: Lower Don Bridge and Don Yard Draft Report

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