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Scarborough Junction Grade Separation

Scarborough Junction Grade Separation - Studies, Impacts, and Mitigation

Environmental Studies

Environmental studies are important components of a TPAP. Along with public feedback, they inform the Draft Environmental Project Report (EPR) that becomes subject for public review and the Minister’s approval.
These studies look at existing conditions to assess potential impacts from construction and operation of the proposed infrastructure and future train service, recommend mitigation measures/monitoring commitments, and provide key information for concept designs.

These environmental studies have been completed for the Project:

Click here to read the highlights from the studies and proposed mitigation measures.
The full study reports can be viewed here.

Midland Layover was proposed infrastructure introduced in Round 2 of public consultation, since than impacts and mitigation measures for the Midland Layover have been explored, to read the highlights of these click here.

*Please note that the Stage 1 AA contains an inaccuracy in relation to how the study area relates to Indigenous Nations. Metrolinx recognizes that the study area is on land covered by the Williams Treaties (1923) and is the traditional territory of the Williams Treaties First Nations including:  the Chippewas of Beausoleil, Georgina Island and Rama and the Mississaugas of Alderville, Curve Lake, Hiawatha, Scugog Island. Corrections to this inaccuracy will be reflected in the Stage 2 AA.

Operational Air Quality and Noise & Vibration

Metrolinx is undertaking air quality studies to assess the local operational air quality impacts of GO Expansion along major segments of Lakeshore East, USRC, Kitchener and Richmond Hill Rail Corridors, where diesel train service will continue to play a major role. Metrolinx is also undertaking a regional system wide operational air quality assessment, which assesses the overall air quality effects from the GO Expansion Program at a regional scale. Scarborough Junction Grade Separation project includes both Stouffville and Lakeshore East Rail Corridors within its study limits.

The operational air quality effects of electrified GO Trains along the Stouffville Rail Corridor have been assessed at the regional scale as the future service will be (mostly) electrified, and as a result, the corridor will experience reduced local air contaminant concentrations from operations.

The operational air quality effects of GO Trains along the Lakeshore East Rail Corridor have been assessed at the local scale as the future service will see a mix of diesel and electric trains operating in the corridor.

The results of both studies are documented in separate reports as part of the GO Rail Network Electrification Addendum. Please visit the GO Rail Network Electrification Addendum project website for more information.

Operational Noise and Vibration studies for both Stouffville Rail and Lakeshore East Corridors are also being undertaken as part of the GO Rail Network Electrification Addendum, please visit the website for more information. 

Utility Conflicts

Utility realignments will be required where proposed infrastructure will conflict with existing utilities.  Conflicts may occur with municipal, communications, gas, electricity, and transit utilities.  These utility conflicts will be confirmed and finalized during detailed design, for a summary of these and the proposed impacts and mitigations please click here.

Commitments and Future Work

Following the TPAP phase, the proposed Infrastructure will move into detailed design and construction phases.  During these phases, all applicable regulations, permits, approvals and best practices will be adhered to.  A few of the key preliminary commitments include:

  • A range of municipal permits and approvals may be required for the Project, particularly as pertaining to municipally owned lands and infrastructure. Metrolinx will obtain all required permits and approvals. However, Metrolinx as a Crown Agency of the Province of Ontario is exempt from certain municipal processes and requirements.
  • In these instances, Metrolinx will continue to engage with the municipalities to incorporate municipal requirements as a best practice, where practical, and may obtain associated permits and approvals. 
  • Metrolinx will continue to communicate and engage with impacted municipalities, utilities and services, and property owners throughout detailed design and prior to construction, where necessary.
  • An Environmental Mitigation and Monitoring Plan will be developed and adhered to during construction.
  • Surrounding property owners and tenants will be informed of anticipated upcoming construction.