A total of 1,165,000 cubic metres of soil will be removed by the tunnel boring machines.
Laird Drive to Don Valley Parkway: Environmental Project Report Addendum Text Summary
Metrolinx is proposing to change the location of the eastern tunnel boring machine (TBM) launch site east of Brentcliffe Road to a site at the southwest corner of Eglinton Avenue East and Don Mills Road.
The proposed relocation of the launch area has also resulted in a change to the LRT alignment between Laird Station and Don Mills Station, from a surface (street-level) LRT line approved in the 2010 Environmental Project Report (EPR) to an underground LRT line.
Why is an Addendum to the EPR Required?
The approved 2010 EPR included a street-level LRT alignment within the centre of Eglinton Avenue between Brentcliffe Avenue and Don Valley Parkway, with a short underground section for the station at Don Mills Road and with surface stops at Leslie Street and Ferrand Drive. The changes to the Project between Laird Drive and Don Valley Parkway include:
- An extension of the underground section from Laird Station to the Don Mills Station;
- Three Emergency Exit Buildings (EEB’s) to meet Fire Life Safety requirements;
- Removal of the surface stop at Leslie Street; and
- Removal of the surface stop at Ferrand Drive.
An Addendum to the EPR is required to assess these changes.
Why is this Change Needed?
The TBM launch site proposed in the approved EPR at Brentcliffe Rd is no longer suitable, due to:
- New property constraints: New development to the south of the Brentcliffe launch site would require temporary shoring to protect the building foundation for the duration of construction, and construction noise mitigation measures may be insufficient;
- Traffic impacts / detour requirements: Traffic disruption would occur over a 28-month period during the operation of the launch site;
- Slope stability: Issues north of Eglinton at the Brentcliffe portal could impact the ability to permanently maintain 4 lanes of traffic at this location; and
- Soil contamination issues: The preliminary design study identified contaminated soil at the Brentcliffe launch site that would have to be removed.
Alternative TBM Launch Sites Considered
2010 Plan: TBM Launch Site East of Brentcliffe Road
|The TBM would tunnel westerly from the launch site to Chaplin Road.
The line would use LRT at street-level between Brentcliffe Road and Don Mills Road.
Current Plan Option 1: TBM Launch Site East of Bayview Avenue
|The TBM would be launched twice from this site, once to tunnel westerly to Yonge Street, and once to tunnel easterly to Brentcliffe Road.
The line would use LRT at street level between Brentcliffe Road and Don Mills Road.
Current Plan Option 2: TBM Launch Site West of Don Mills Road
|The TBM would tunnel westerly to Yonge Street from the launch site.
The line would use LRT underground between Brentcliffe Road and Don Mills Road.
The recommended TBM launch site is Option 2: TBM Launch Site West of Don Mills Road site as it offers:
- Larger launch site allows for more efficient construction and traffic staging;
- Improved LRT operations between Laird Station and Don Mills Station; and
- Fewer sensitive noise receptors nearby.
The below image illustrates the study area for EPR Addendum:
Commitments to Future Work
Metrolinx is proceeding with the delivery of the Eglinton LRT through Public Private Partnership and Alternative Financing & Procurement (AFP). Through this process Metrolinx is committed to:
- Continuing Public Consultation: We will consult with the public, property owners and stakeholder agencies during the design of the LRT, stops/ stations, bus terminals and ancillary facilities.
- Incorporate City of Toronto urban design criteria into the design of the LRT facilities.
- Mitigate construction Issues: We will conduct further research, analysis and develop plans including:
- Noise, vibration and air emissions monitoring and mitigation;
- Traffic, transit and pedestrian management strategies;
- Utility and municipal services relocation plans;
- Emergency response plans (Fire, Police and Emergency Medical Services);
- Vegetation restoration, edge management and streetscape plans;
- Soil and groundwater management strategy; and
- Erosion and sedimentation control plan
The below image illustrates where we are in the consultation process:
Please contact us with any additional questions.