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Project Update - Combined Sewage Storage Tunnel (CSST) - April 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, in summer 2018, the tunnel boring machine (TBM) will complete its 2-kilometre journey under the city, exiting behind the Supreme Court of Canada.
Locomotive used for transfer of workers through the tunnel.
Locomotive used for transfer of workers through the tunnel. 
Completed portion of the tunnel, showing concrete segments assembled by the TBM
Completed portion of the tunnel, showing concrete segments assembled by the TBM, underground train rails and air ventilation system. 

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.
Gantry crane dumps a car full of excavated material into designated stockpiling area.
Gantry crane dumps a car full of excavated material into designated stockpiling area. 

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; with concrete installation well underway.
  • Excavation of the TBM exit portal is underway.
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 and starter tunnels at the bottom of the 5A shaft (within which the TBM will be assembled).
  • Excavation for the Interceptor Outfall Sewer (IOS) connection chamber is ongoing.
  • At 5C (the intersection of Queen Victoria and River Lane), rock excavation for the Rideau River Collector connection chamber is underway.
  • Microtunneling from shaft 5B to shaft 5A is underway. 
Excavation of the starter tunnel at the bottom of the 5A shaft.
Excavation of the starter tunnel at the bottom of the 5A shaft.
Hoe-ramming the edges of the excavation to expose existing infrastructure within the shaft at 5C.
Hoe-ramming the edges of the excavation to expose existing infrastructure within the shaft at 5C.

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:
  • Waler (horizontal beam) and toe anchor (brace) installation as part of shaft excavation support system.
  • Hoarding installation along Queen Elizabeth Drive and the Laurier east-bound ramp ie: the odour control facility.
  • Commenced excavation and excavation shoring system installation at odour control facility. 
Excavation of the shaft within Confederation Park.
Excavation of the shaft within Confederation Park. 
Installation of shoring support system for excavation at 3a odour control facility location.

Installation of shoring support system for excavation at 3a odour control facility location.

Site 1: West End Shaft – LeBreton Flats

Site 1 will be the exit point for the TBM and the western end of the East-West Tunnel (EWT). 

Site 1 construction activities of interest:
  • Phase one of construction is now complete. More to come when phase two commences.

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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