Environmental Assessment and Compliance
Read About the Our Efforts to Ensure that Subway Construction Meets Environmental Standards
Here’s what Toronto-York Spadina Subway Extension is doing to meet Environmental Commitments.
Two Environmental Assessments were prepared on the Toronto-York Spadina Subway Extension TYSSE Project. A Toronto Environmental Assessment addresses four stations and the tunnel alignment from the Downsview Station to Steeles Avenue (approved by the Minister of the Environment, October 18, 2006 (received March 23, 2007). A York Region Environmental Assessment (approved by the Minister of the Environment November 29, 2009) and a follow-on Conditions of Approval Report (approved by the Ministry of the Environment April 4, 2008) addresses two stations and the tunnel alignment from Steeles Avenue north to the Vaughan Metropolitan Centre area. Links to the original Environmental Assessment/Conditions of Approval reports are found below.
Click on the following links to view the entire Toronto-York Spadina Subway Extension Environmental Assessment and the York Region Conditions of Approval report.
Environmental Assessment of Detailed Design Changes
During detailed design changes to the alignment have been evaluated with two Environmental Assessment Amendments and two Effects Reports. The Ministry of the Environment has reviewed and accepted all of the reports as fulfilling the necessary amending requirements of the original Environmental Assessments.
Change in Tunnel Construction Method's at Sheppard West Station Area
Toronto Environmental Assessment Alignment changes are detailed in the report titled:
Change in Subway Tunnel Construction Methods at Sheppard West Station Area (July 12, 2010)
- Ministry of the Environment Change (MOE) Letter of Acknowledgment - Change - Sheppard West Station (October 8, 2010)
MOE Letter of Acknowledgment - Change - Sheppard West Station 
Change in Train Storage Location and Construction Methods for the Tunnels in Keele Street
Toronto-York Spadina Subway Extension in consultation with the Ministry of the Environment has decided not to proceed with a full Amendment to the approved Environmental Assessment for these changes, due to the absence of a change in effects on the environment from that found in the original Environmental Assessment. The report documents the changes included and the resulting effects. Report is titled:
Change in Train Storage Location and Construction Methods for the Tunnels in Keele Street (September 14, 2010)*
- Ministry of the Environment (MOE) Acknowledgement - Train Storage - Keele Street (October 1, 2010)
MOE Acknowledgement - Train Storage - Keele Street
York Region Environmental Assessment Changes documented in the report titled:
Tower 158 Avoidance EA Amendment (March 10, 2010)*
- Ministry of the Environment (MOE) 158 Avoidance Environmental Assessment Amendment (April 28, 2010)
MOE Approval Letter Tower 158 EA Amendment
Changes in Subway Tunnel and Vaughan Metropolitan Centre Station Alignment Report*
- Ministry of the Environment (MOE) Acknowledgement - Vaughan Metropolitan Centre - Tunnel Alignment (October 1, 2010)
MOE Acknowledgement - Vaughan Corporate Centre - Tunnel Alignment
Notes
Reports: Note that copies of all of the reports are available through the project office 416-397-8757 or email: TYSSE@ttc.ca and have been placed in the appropriate municipal clerk’s office and at the Ministry of the Environment.
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