Environmental Assessment

Two Environmental Assessments (EAs) were prepared on the TYSSE Project. A Toronto EA 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 EA (approved by the Minister of the Environment November 29, 2009) and a follow-on Conditions of Approval (COA) Report (approved by MOE April 4, 2008) addresses two stations and the tunnel alignment from Steeles Avenue north to the Vaughan Metropolitan Centre area. Links to the original EA/COA reports are found below.

Click on the following links to view the entire Toronto-York Spadina Subway Extension EAs and the York Region Condition of Approval (COA) report.

• www.vivanext.com/281 
• www.vivanext.com/279  

Environmental Assessment of Detailed Design Changes

During detailed design changes to the alignment have been evaluated with two EA Amendments and two Effects Reports. MOE has reviewed and accepted all of the reports as fulfilling the necessary amending requirements of the original EAs.

Toronto EA Alignment changes are detailed in:

• Change in Subway Tunnel Construction Methods at Sheppard West Station Area, and
• Change in Train Storage Location and Construction Methods for the Tunnels in Keele Street

York Region EA Alignment changes are detailed in:

• Tower 158 Avoidance EA Amendment, and
• Changes in Subway Tunnel and Vaughan Corporate Centre Station Alignment

Links to each report are found below:

Toronto EA Changes

Change in Tunnel Construction Method’s at Sheppard West Station Area

• Change in Subway Tunnel Construction Method at Sheppard West Station Area (2.5 mb)
• MOE Letter of Acknowledgment (111 kb)
• Sheppard West EA Addendum 2 (10.6mb) 
• Appendix A - MOE Original EA Approval (2.6 mb)
• Appendix B - Final Construction Traffic Impact Assessment Report (2.1 mb) 
• Appendix C1 C2 - Geotech Figures - South Tunnel Geo-Engineering Report Final Design signed (9.7 mb)  
• Appendix C3 - Sheppard West Rpt 09Feb13 Geo-Engineering Design Brief (1.1 mb)
• Appendix D - 90 Percent Storm Water Management Report - May 11 (1.9 mb)
• Appendix E - Natural Heritage Existing Conditions Report and Impact Statement (17.8 mb)
• Appendix F - Archaeological Assessment and Approvals (10 mb)
• Appendix G - Noise and Vibration Reports (16.3 mb)
• Appendix H - South Tunnel Sheppard West EMP Draft - 5-28-10 (3.4 mb)
• Appendix I - Record of Consultation (9 mb)
• Appendix J - Interactions Matrix Chapter 5 (610kb)

Change in Train Storage Location and Construction Methods for the Tunnels in Keele Street

Toronto-York Spadina Subway Extension in consultation with MOE 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 EA. The report documents the changes included and the resulting effects. 

• Effects Report on Changes in Train Storage Location and Construction Methods For the Tunnels in Keele Street (5.2mb) 
• MOE Sign Off Letter (Toronto) (62 kb) 

York Region EA Changes

Tower 158 Avoidance EA Amendment 

• Tower 158 Avoidance
• Tower 158 Avoidance EA Amendment Report (7mb)
• MOE Letter of Approval 
• Appendix A - Ministry of the Environment Approval Letters (6mb) 
• Appendix B - Interpreted Stratiagraphic Profile (153kb) 
• Appendix C - Selected Borehole Data (16mb)
• Appendix D - Hwy 407 Initial Geo-Engineering Design Fraft Report (2mb)
• Appendix E - Fluvial Geomorphology (392kb)
• Appendix F - Highway 407 Station Existing Conditions Report (3.4mb)
• Appendix G - Steeles West Station Natural Heritage Features Report (4mb)
• Appendix H - Highway 407 Station Phase 1 ESA Draft Report (6.4mb) 
• Appendix I - Steeles Hydro Corridor Phase 1 ESA Draft Report (5.4mb)
• Appendix J - Highway 407 Station Archaeological Assessments (6.5mb) 
• Appendix K - Steeles West Station Archaeological Assessment (3mb) 
• Appendix L - Hwy 407 Hydraulic Stormwater Management Reports (5mb) 
• Appendix M - DFO Request for Project Review (41mb) 
• Appendix N - Butternut Removal and Restoration Proposal to MNR (4mb) 
• Appendix O - Transport Canada CEAA Record of Decision (306kb) 
• Appendix P - Record of Consultation (16.5mb) 

Changes in Subway Tunnel and Vaughan Corporate Centre Station Alignment Report

• Changes in Subway Tunnel and Vaughan Corporate Centre Station Alignment Report (4.3 mb) 
• MOE Sign Off Letter (York Region) (64 kb) 
• Appendix A1 - Ministry of the Environment EA Letters of Approval (6.2 mb) 
• Appendix A2 A3 - Ministry of the Environment EA Letters of Approval (558 kb) 
• Appendix B - Property Owners Letters of Support of Alignment Changes (7.5mb) 
• Appendix C - Original EA Alignment Drawings (469 kb) 
• Appendix D1 - Geotechnical Information (11 mb) 
• Appendix D2 - Geotechnical Information (2.5 mb) 
• Appendix E - Noise and Vibration Report (21 mb) 
• Appendix F - Original EA/Condition of Approval Report Table 4-2 Mitigation and Effects (123 kb) 
• Appendix G - Consultation Notices (501 kb)