1. CROSSTOWN LRT
Construction Liaison Committee
June 14, 2017

2. Agenda
Leaside Station Update
Laird Station Update

3. Leaside Station Concept: Aerial View
Main Entrance
Accessible Entrance
Outdoor bicycle parking
Accessible Entrance
Secondary Entrance
*60% rendering

4. Leaside Station: 2016 in Review
Demolition at 1787 Bayview Ave completed
Median Removals & temporary traffic signals installations
Utility relocations (hydro & telecommunications), underway or complete
Support of excavation (shoring) work started at Main Entrance

5. Leaside Station: What to Expect in 2017
Year
Quarter
Construction Activity / Closure
2017
Q1 (Jan-March)
Bell, hydro and other telecom utility relocations
Support of excavation (shoring) underway at Main Entrance
Stage one for support of excavation activities in right of way (work will be completed in 4 stages)
Q2 (April-June)
Stage one ongoing
Drill to move to Secondary Entrance in late June/early July
Temporary Site Service Connections (hydro)
Dewatering System Installation
Q3 (July-Sept)
Stage one B
Stage two support of excavation activities in right of way
Q4 (Oct-Dec)
Stage three of support of excavation activities in right of way

6. How We’re Building Leaside Station: Support of Excavation
Shoring is a common step in the process of installing the foundation of a building.
In the first stage, an area the size of the station’s footprint (about 100m x 20m) will have steel piles installed around the perimeter. Then a shallow area is excavated and braces and tie-backs are installed around the sides to support the excavation.
Decking is then placed over the excavation to allow the crew to work under the roadway safely while traffic flow resumes above.
The shoring stage at Leaside Station started in January and will take approximately 15 months to complete.

7. How We’re Building Leaside Station: Excavation and Mining
During the excavation, crews continue to work safely beneath the roadway.
At Leaside Station a section of the station box will also be mined during this time.
With the mining method, the underground area to be excavated is divided into manageable segments and the segments are excavated in a planned sequence.
The excavation creates a shotcrete-lined cavern underneath Eglinton Avenue East. Within the cavern, the station box is constructed accommodating the rail tunnels, associated platform and rail infrastructure.

8. Support of Excavation (shoring): Station Box
Mined Area

9. Support of Excavation (shoring): Stage One
A. Wong discussed the safety concerns regarding traffic light lead/lag phasing presented in the
previously reviewed TTMP and CTS’ options to address these concerns. A. Wong presented five
scenarios (A, B, C, D & E) that detail different feasible (must have separated WBL and EBL turns
due to turning path overlap) phasing options. A. Wong noted that Scenario A (protected
EBL/restricted WBL) and Scenario B (EBL/WBL split phase) are the most feasible to be safely
implemented, and that specifically Scenario A is recommended by CTS due to the operational
advantages. The remaining proposed scenarios are Scenario C (leading EBL/lagging WBL), Scenario
D (protected EBL/permissive WBL) and Scenario E (protected-permissive EBL/restricted WBL).
Questions & Comments:
· P. Hillier noted that Scenario E is similar to Scenario A and asked why this option was not included
in CTS’ preferred options.
· A. Wong responded stating that there was concern with the pedestrian movements and
driver-pedestrian sightlines.
· P. Hillier asked if the EBL queue can be addressed with just protected.
· A. Wong noted that results from the Traffic Study showed that the PM peak presented a
50m 95th percentile queue.
· L. Lui asked if the length of the EBL queue can be expanded.
· A. Wong noted that he would take a look to see if additional space can be provided.
· P. Hillier asked if the COT could review the traffic analysis prepared for the Scenario A, B & E.
· A. Wong responded stating that CTS would provide the documents today.
· R. Stewart asked what the timing is associated with this decision.
· J. Sestito noted that a response from the COT is required immediately as the construction
team is waiting to install the temporary lights.
· M. Huk expressed concern regarding the typical number of ambulance turning movements to
head north onto Bayview and that this needs to be considered in the scenario option decision.
· R. Shamess noted complaints from the SW corner condo regarding WheelTrans pick-up/drop-offs
and access issues.
· P. Hillier is not convinced that the EB protected left is required.

10. Proposed Stage 1B

11. Proposed Stage 2

12. Progress Picture – Main Entrance

13. Progress Picture – Station Box

14. Laird Station Concept: Aerial View
Main Entrance (accessible entrance) S
Laird Drive
Secondary Entrance
Eglinton Ave E
*60% rendering

15. How We’re Building Laird Station: Support of Excavation
Laird Station will be constructed using a mined method known as Sequential Excavation Method or SEM. The first stage is support of excavation.
Support of excavation (shoring) is a common step in the process of installing the foundation of a building.
In the first stage, crews will install steel piles around the perimeter of the entrance. This has been completed at both entrances.
In the second stage, crews excavate the area level by level, installing braces and tie-backs as they progress. This work is underway at the main entrance.
Support of Excavation (Shoring)
Shoring is a common step in the process of installing the foundation of a building.
This will support the surrounding loads until the underground levels of the building are constructed.

16. How We’re Building Laird Station: Sequential Excavation Mining Method
Mining occurs from inside of the excavated entrances after the support of excavation is complete. This work now underway at the secondary entrance.
The underground area to be excavated is divided into manageable segments and the segments are excavated in a planned sequence.
Within the mined area, the station box is constructed accommodating the rail tunnels, associated platform and rail infrastructure.
Laird station has one of the longest station areas with approximately 500m to be mined. This is to accommodate special track to store a LRV between the tracks or for an LRV to change direction in the event of a service disruption.

17. Laird Station: 2016 in Review
Geotechnical Investigation completed
Demolition at Laird Drive completed
Utility relocations (hydro & telecommunications)
Piling work completed and excavation work started at both entrances
Temporary traffic signals installations

18. Laird Station: What to Expect in 2017
Year
Quarter
Construction Activity
2017
Q1 (Jan-March)
Site Service Connections - Completed
Excavation (shoring) underway at Main (underway) and Secondary entrance (completed)
Long-term closure at Main entrance – in place
Q2 (April-June)
Crane erection secondary entrance – completed
Mining operations at Secondary entrance - underway
Dewatering System installation - underway
Concrete pour into tunnels - underway
Utilities protection
Gas Main Support - underway
Sewer Lining - upcoming
Crane erection main entrance – upcoming
Excavation ongoing at Main entrance
Q3 (July-Sept)
Ongoing mining operations at Secondary entrance
Start of mining operations at Main entrance
Q4 (Oct-Dec)
Mining continues at both entrances (mid 2017 to late 2019)

19. Laird Long Term Closure

20. Support Works – Utilities Mitigation
What to expect: Sewer Lining
Sewer lining is a process intended to increase the durability of the sewers.
A section of the sewer system is cleaned and vacuumed and a CCTV inspection is completed. Then a liner is inserted into the sewer section from within the maintenance holes
The process is designed to be generally non-disruptive and eliminates the need for excavation of the entire sewer section.
Maintenance holes that will be accessed are located on Eglinton Avenue East between Sutherland Drive and Brentcliffe Road.
Lane closures will be required for this work. Pedestrian access will be maintained.
Above ground pipes will be in place between maintenance holes to bypass pump around the sewer lines during the liner installation.
Due to the nature of the work, an unpleasant chemical odour may be noticeable in the vicinity of the maintenance holes and, in some circumstances, in the home. It is not harmful, however it can be limited by covering floor drains while the sewers are being lined.
A public notice with additional details will be distributed prior to work beginning.

21. Support Works – Utilities Mitigation
Sewer Lining Activity Examples
What to expect: Sewer Lining

22. Progress Picture – Main Entrance

23. Progress Picture – Secondary Entrance

24. Local Area Map
Station(s) under construction

25. Community Benefits – Laird Mural
Creation of a mural that reflects the Thorncliffe Park neighbourhood
Design concept under development
Production/painting is scheduled for the first week of July (July 4-7)
Feedback welcome!