Notice of Addendum Completion

The City of Markham has completed an Environmental Study Report Addendum to the approved 2009 Highway 404 Ramp Extension at Major Mackenzie Drive Environmental Assessment.

As part of the Study, the report will be available for public review to allow local residents, agencies and other interested members of the public an opportunity to review and provide input on the Addendum. Please use the links below to view the report.

Interested persons may provide written comments to the project team by November 26. 2026. All comments and concerns should be sent directly to Laura Chong (Hwy404ExtensionEAAddendum@markham.ca) at the City of Markham and Catherine Voytenkov (cvoytenkov@GFNET.com) at Gannett Fleming.

In addition, a request to the Minister of the Environment, Conservation and Parks for an order imposing additional conditions or requiring an individual environmental assessment may be made on the grounds that the requested order may prevent, mitigate or remedy adverse impacts on constitutionally protected Aboriginal and treaty rights. Requests should include your full name and contact information and received by November 26, 2026.

Requests should specify what kind of order is being requested (additional conditions or an individual environmental assessment), explain how an order may prevent, mitigate or remedy potential adverse impacts, and can include any supporting information.

Environmental Study Report Addendum:

Highway 404 Ramp Extension at Major Mackenzie Drive Environmental Study Report Addendum

Appendices:

Appendix A - Design Drawings, Design Criteria & Preliminary Structural Design Report
Appendix B - Consultation Record
Appendix C - Natural Environment Impact Assessment Report
Appendix D - Stage 1-2 Archaeological Assessment Report & MCM Correspondence
Appendix E - Noise Impact Assessment Report
Appendix F - Air Quality Assessment Report
Appendix G - Geotechnical Site Investigation
Appendix H - Drainage & Stormwater Management Report
Appendix I - Transportation Study Update
Appendix J - Future Commitments for a 3:1 Slope