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Project Update - Combined Sewage Storage Tunnel (CSST) - June 2018

Ottawa River

Building a healthy and resilient future for the Ottawa River

This $232.3 million construction project is a key part of the Ottawa River Action Plan (ORAP), which is aimed at enhancing the health of the Ottawa River and protecting our water environment for future generations. A healthy water environment provides safe, abundant drinking water; supports agriculture, recreation and tourism; lessens the impact of flood events; and helps sustain fish and wildlife.

Construction Site Map

The map below identifies construction sites for the CSST project within the City of Ottawa, which are described in more detail here.
Map of the CSST sites numbers 1 to 10. Sites 5, 6 and 10 are green, site 7 is grey and all other sites are red
The CSST will consist of two inter-connected tunnels over six kilometres in total length, three metres in diameter, located 10 to 31 metres below surface level. The North-South Tunnel will run below Kent Street, from Chamberlain Avenue to just behind the Supreme Court of Canada, and the East-West Tunnel (EWT) will run through the downtown core, from Stanley Park to LeBreton Flats, generally under Cumberland and Slater Streets.

Construction is underway at several sites. 

Construction Activity Progress

North South Tunnel (NST)

Tunneling of the NST from Kent/Chamberlain Streets to the Ottawa River (Site 10 to Site 6) is underway. At the other end of the NST, work is underway on the exit portal near the Ottawa River where, soon, the tunnel boring machine (TBM) will complete its 2-kilometre journey under the city, exiting behind the Supreme Court of Canada.
underground train rails and air ventilation system
Completed portion of the tunnel, showing concrete segments assembled by the TBM, underground train rails and air ventilation system.   
Completed portion of the tunnel looking towards the access shaft, showing the locomotive used to transfer workers in and out of the tunnel, tracks, ventilation system, and lighting.
Completed portion of the tunnel looking towards the access shaft, showing the locomotive used to transfer workers in and out of the tunnel, tracks, ventilation system, and lighting.

Site 10: Chamberlain Shaft (Kent/Chamberlain Streets)

Site 10 is the launch shaft for the north-south tunneling operation.

Site 10 construction activities of interest:
  • Geotechnical monitoring continues.
  • Surface works to support tunneling operations: removal of excavated material and insertion of precast concrete liners by gantry crane.
  • Excavated material is stockpiled and trucked off-site during daytime hours.
Overview of above ground operations to support tunneling, including gantry crane, excavated material stockpile and concrete segment stockpile and delivery.
Overview of above ground operations to support tunneling, including gantry crane, excavated material stockpile and concrete segment stockpile and delivery.

Site 6: North South Tunnel Overflow/Kent Street Outfall - Ottawa River Pathway

Site 6 will be the exit point for the TBM and the northern end of the North-South Tunnel. It is expected that the TBM will emerge here, along the Ottawa River behind the Supreme Court of Canada, in summer 2018.

Site 6 construction activities of interest:
  • Geotechnical monitoring continues.
  • Construction of the new Kent Street outfall chamber is well underway.
  • Backfilling and compacting around box culvert, from outfall chamber to the Ottawa River.
  • Excavation of the TBM exit portal is complete.
Installation of formwork for new Kent Street outfall chamber.
Installation of formwork for new Kent Street outfall chamber.                  
Excavation of the TBM exit portal, behind the Supreme Court of Canada.
Excavation of the TBM exit portal, behind the Supreme Court of Canada. 

Site 5: East-West Tunnel Outlet and Rideau River Collector Diversion (New Edinburgh)

Construction continues in New Edinburgh's Stanley Park, where the TBM will start its East-West journey later in 2018, and at the intersection of Queen Victoria Street and River Lane (to connect to existing overflow sewer infrastructure).

Site 5 construction activities of interest:
  • Excavation of the tail, starter and Interceptor Outfall Sewer (IOS) connection tunnels at the bottom of the 5A shaft are complete.
  • Excavation for the IOS connection chamber is ongoing.
  • Tunneling of the diversion sewer from shaft 5B to shaft 5A is complete. 
  • At 5C (the intersection of Queen Victoria and River Lane),  rock excavation is complete. Tunneling of a diversion sewer between 5B and 5C will begin shortly. 
Diversion sewer tunnel platform and tail tunnel at the bottom of the 5A shaft.
Diversion sewer tunnel platform and tail tunnel at the bottom of the 5A shaft.
Preparation for tunneling support equipment on surface at shaft 5A.
Preparation for tunneling support equipment on surface at shaft 5A. 

Site 3A: Rideau Canal Interceptor Diversion/Drop – Confederation Park

Construction of a new underground diversion chamber and drop structure is underway at Site 3A. Excess flows from the existing Rideau Canal Interceptor will be diverted to the EWT at this location.

 Site 3A construction activities of interest:
  • Continued rock excavation, rock dowel installation and shotcrete application within the shaft at 3a.
  • Completed structural steel superstructure and main floor steel deck installation for odour control facility.
Excavation of the TBM exit portal, behind the Supreme Court of Canada.

Excavation of the TBM exit portal, behind the Supreme Court of Canada. 
Structural steel assembly and stone work at 3A odour control facility location.
Structural steel assembly and stone work at 3A odour control facility location.

Site 8: McLeod Street Drop – McLeod Street and Kent Street

Work on McLeod Street, near Kent Street, will include completion of the McLeod relief sewer, and the construction of underground chambers to convey flows from this sewer to the NST.
  • Construction activity began the week of June 18, with traffic control implementation, signage and site fencing installation, and some water works.  
•	Installation of fencing and signage around site 8 construction area.

Installation of fencing and signage around site 8 construction area.

Mobility & You

Stay informed about capital infrastructure projects. Check out the City’s interactive traffic map and traffic report or call 3-1-1 for updates about when and where construction is happening.

Contact Us

The CSST Project Team is committed to sharing information that may help affected residents and businesses plan around construction in their neighbourhoods.

For more information:

The CSST dedicated phone number is 613-580-2424 ext 2CSST (22778).  (This does not replace 3-1-1).
  
Visit us on the web at Ottawa.ca/CSST or email the project team at CSST@ottawa.ca
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