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Environmental Impact Assessment Report

The Ontario Line - Environmental Impact Assessment Report


The Ontario Line will bring 15.6 kilometres of new subway service to Toronto, making it faster and easier for people to get where they need to be each day. The line will stretch across the city, from the Ontario Science Centre in the northeast to Exhibition/Ontario Place in the southwest.

The Ontario Line will have:

  • 15 new stations, including six interchange stations;
  • Connections to three GO train lines, two existing subway lines, the new Eglinton Crosstown LRT, and streetcar lines at 10 stations;
  • A combination of tunneled, surface and elevated segments.

The Ontario Line will also be completely separated from traffic to provide fast and reliable service.

Environmental Impact Assessment Report

The Environmental Impact Assessment Report, prepared in accordance with Ontario Regulation 341/20: Ontario Line Project, Section 15, provides a description of local environmental conditions, potential impacts, proposed mitigation and monitoring measures, a record of consultation, and a description of future permits and approvals that may be required.

How to Participate

The Draft Environmental Impact Assessment Report was available for public review and general comment until March 09, 2022. Public feedback received has been incorporated into the Final Environmental Impact Assessment Report.

To read the results of a specific environmental study, select one of the environmental studies below.

To review the full report, visit the Full Report page. 

The Environmental Impact Assessment Report is available for review:

View the Full Report


The environmental assessment process for Ontario Line included assessment of impacts and identification of mitigation measures for the following environmental components:

Appendices

air quality icon

Air Quality

Archaeology icon

Archaeology

Built Heritage Resources & Cultural Heritage Landscapes icon

Built Heritage Resources & Cultural Heritage Landscapes

Natural Environment icon

Natural Environment

Noise & Vibration icon

Noise & Vibration

Socio-Economic & Land Use Characteristics icon

Socio-Economic & Land Use Characteristics

Soil & Groundwater icon

Soil & Groundwater

Traffic & Transportation icon

Traffic & Transportation

 

Environmental impacts of the Ontario Line Project are being assessed in accordance with Ontario Regulation 341/20: Ontario Line Project (O. Reg. 341/20), under the Environmental Assessment Act. The assessment process includes the following:

  • Reviewing and examining Project components and activities;
  • Understanding local environmental conditions through desktop reviews and field studies;
  • Assessing and evaluating potential impacts that Project components and activities may have on the environment;
  • Proposing mitigation measures to avoid or reduce impacts, and monitoring activities to verify effectiveness of mitigation measures; and,
  • Identifying any municipal, provincial, federal or other permits and approvals that may be required as planning progresses.

The Environmental Impact Assessment Report provides the following:

  • A description of the Project;
  • A map showing the site of the Project;
  • The rationale for proceeding with the Project and a summary of background information;
  • A description of the local environmental conditions;
  • A description of studies undertaken;
  • Metrolinx’s assessment and evaluation of the impacts that the Project might have on the environment;
  • A description of measures proposed by Metrolinx for mitigating negative impacts that the Project might have on the environment;
  • A description of the means Metrolinx proposes to use to monitor or verify the effectiveness of mitigation measures proposed;
  • A description of municipal, provincial, federal or other approvals or permits that may be required for the Project; and,
  • A consultation record.

The Ontario Line works are planned to extend from the Ontario Science Centre in the northeast to Exhibition/Ontario Place in the southwest and will include:

  • Stations;
  • Tracks and tunnels;
  • Bridges;
  • Operations and maintenance (train storage yard, maintenance facility and operations centre, layover facilities);
  • Emergency exit buildings;
  • Construction laydown and staging areas;
  • Noise barriers;
  • Portals;
  • Retaining walls;
  • Traction power substations;
  • Vehicles; and
  • Ancillary works (new public road connections, Hydro One corridor relocation, new multi-use trail, streetcar diversion tracks).

Map

Environmental Studies