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Air Quality - East Harbour Station

← Return to Early Works: East Harbour Station Draft Report

Key Findings

  • There are existing exceedances of vehicle 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.
  • Sixteen sensitive receptors* have been identified in the study area: 180-190 Mill Street (SR1), 495 Front Street East (SR2), 500 Front Street East (SR3), 170 Bayview Avenue (SR4), 20 Trolley Crescent (SR5), 77-79 East Don Roadway (SR6), 15 Baseball Place (SR7), 130 Eastern Avenue (SR8), 68 Broadview Avenue (SR9), 9 Lewis Street (SR10), 2 McGee Street (SR11), 33 Saulter Street (SR12), 66 McGee Street (SR13), 89 McGee Street (SR14), 8 Boulton Avenue (SR15), and 12 De Grassi Street (SR16) – without mitigation, these locations have the potential to be affected based on proximity to the project footprint and predominant wind direction from the northeast towards the southwest.
  • One critical receptor** has been identified in the study area: 131 Broadview Avenue (CR1) – without mitigation, this location has the potential to be affected based on proximity to the project footprint and predominant wind direction from the northeast towards the southwest.
  • 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.
**A critical receptor is a retirement home, hospital, childcare centre, school, or similar institutional building.

Sensitive and Critical Receptors within the East Harbour Station 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 where feasible.
  • Use dust suppressants such as water as required.
  • Implement on-site air quality monitoring and apply threshold “Action Level” triggers for implementation of specific and increasing intensity mitigation activities linked to specific construction activities.

Construction vehicle driving over a mud mat

Construction vehicle driving over a mud mat.
Source: https://wheelwash.com/products/wheelwash-geowell/

← Return to Early Works: East Harbour Station Draft Report