Noise and Vibration

 

We understand that noise and vibration from the subway may be of concern for nearby residents and we are committed to minimizing any potential impacts wherever possible.

 

During construction, heavy equipment and activities like excavation can be a source of increased noise and vibration. Once the line is operational, the potential for ground vibration and a low frequency “rumble” are two of the most important factors to consider for noise/ vibration sensitive areas located close to the subway alignment.

 

To identify potential impacts, we have carried out a Noise and Vibration Impact Assessment.

 

How are noise and vibration studied?

Models are used to predict the noise and vibration at certain points near noise/vibration sensitive areas. These predictions are compared to existing noise and vibration at the same points.

 

What is a noise/vibration sensitive area?

A noise/vibration sensitive area is a land use that is sensitive to noise and vibration, whether inside and/or outside the property. Examples include:

  • residential developments
  • seasonal residential developments
  • hospitals, nursing/retirement homes, schools, day-care centres
  • other land uses that may include outdoor areas or spaces where an intruding noise may creat an adverse effect

 

How will we reduce the impacts?

  • The installation of a “floating slab” system will decrease the vibration/noise levels significantly
  • TTC will continue to follow their practices of routine maintenance of train wheels to eliminate “wheel flats” and reduce noise
  • Control measures such as partial sound barriers at transformer substations, or acoustical treatment to ventilation shafts would be used, if necessary

 

With the implementation of these mitigation measures, any impact is expected

to be minor, and within recommended thresholds.

 

Existing noise and vibration sources

Currently the main source of the existing – i.e. ambient – noise and vibration in the area are trucks and buses.

 

Estimated future noise and vibration

Our extensive studies predict that:

 

1. Air-borne noise impact from the bus terminal at Scarborough Centre on the closest residential receptor would not noticeably change due to the existing ambient and vehicular traffic on the nearby roads.

 

2. Properties around the proposed SSE alignment may experience between 10 (barely audible) and 35 (just above a soft whisper) dBA. Vibration levels will also be generally imperceptible in the urban context.

 

 

 

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