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Air Quality - Lower Don Bridge and Don Yard

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

Key Findings

  • There are existing exceedances of vehicular exhaust combustion contaminants benzene and benzo(a)pyrene. These contaminants are also byproducts of regional industrial operations. High background concentrations of these two contaminants are typical of a highly urbanized environment like the City of Toronto.
  • Thirteen sensitive receptors* have been identified in the study area (i.e., houses and apartments/condominiums): 33 Mill Street (SR1), 390 Cherry Street (SR2), 125/131 Mill Street (SR3)**, 170 Mill Street (SR4), 180-190 Mill Street (SR5), 495 Front Street (SR6)**, 500 Front Street (SR7), 170 Bayview Avenue (SR8), 20 Trolley Crescent (SR9), 77-79 East Don Roadway (SR10)**, 130 Eastern Avenue (SR11), 68 Broadview Avenue (SR12), 9 Lewis Street (SR13)– without mitigation, these locations have the potential to be affected based on proximity to the project footprint and predominant wind direction.
  • One critical receptor*** has been identified in the study area: 19 Sackville Street (CR1).
  • There is potential for temporary increases in contaminants associated with construction vehicle emissions. These increases will be reduced by implementing appropriate mitigation measures (see Potential Effects & Mitigation Measures for more details).

*A sensitive receptor is a building in which a person resides on a permanent or semi-permanent basis, such as a house or an apartment.

**Under development.

***Retirement home, hospital, childcare centre, school, or similar institutional building.

Sensitive Receptors within the Lower Don Bridge and Don Yard Early Works Study Area

Sensitive Receptors within the Lower Don Bridge and Don Yard Early Works Study Area

Potential Effects & Mitigation Measures

Potential Effects:

  • Temporary increase in air pollution and odour (e.g., diesel combustion products such as NO2) as a result of construction vehicle emissions and increased traffic due to congestion associated with early works activities.
  • Temporary increase in dust, silica and airborne particulate matter resulting from earthworks, material handling and transfer, and other construction activities.

Mitigation Measures:

  • Construction equipment will comply with all applicable regulatory emission standards.
  • Contain (e.g., tarp) sources of dust such as soil stockpiles as required.
  • Removal of accumulated mud, dirt and debris deposits, and regular truck washing.
  • Reduction of activities during high wind conditions.
  • Use dust suppressants such as water as required.
  • Application of threshold triggers for implementation of specific and increasing intensity mitigation linked to specific construction activities.
  • Application of threshold “Action Level” triggers for implementation of specific and increasing intensity mitigation activities linked to specific construction activities.

Washing stations are one way that dust and particulate release from construction vehicles can be managed and mitigated.

Washing stations are one way that dust and particulate release from construction vehicles can be managed and mitigated. 

Source: https://wheelwash.com/products/wheelwash-geowell/

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

Submissions are closed.