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Project Update - Combined Sewage Storage Tunnel (CSST) - August 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.

Tunneling of the north-south portion of CSST is now complete – Watch the breakthrough here!

The tunnel boring machine emerging through the rocky cliff behind the Supreme Court of Canada on Wellington Street signified a major milestone for the Combined Sewage Storage Tunnel project: the completion of the north-south tunnel.
 
Tunneling began on Chamberlain Avenue in December 2017, continuing for over two kilometres and up to eight storeys below Kent Street, before arriving at the Ottawa River behind the Supreme Court of Canada. The 250-metre-long tunnel-boring machine will now be dismantled, moved and re-assembled to begin tunneling the east-west tunnel from New Edinburgh to LeBreton Flats later this year.

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 alignment and sites. The East-West tunnel runs through the downtown core from LeBreton Flats to New Edinburgh, and the North-South tunnel runs from Chamberlain Avenue to behind the Supreme Court of Canada. Description of sites, indicated by orange dots, are as follows: Site 1: West End Shaft - LeBreton Flats Site 2: East West Tunnel/North South Tunnel Intersection - Kent and Slater Streets Site 3a: Rideau Canal Interceptor
Diversion Chamber - Confederation Park Site 3b: Rideau Canal Regulator – Rideau Canal Site 3cR: Wilbrod and Cumberland Streets Site 4: St. Patrick Shaft - York and Cumberland Streets Site 5: East West Tunnel Outlet and Rideau River Collector Diversion - New Edinburgh Park Site 6: NST Overflow/Kent Street Outfall - Ottawa River Pathway Site 7: Identified with a grey dot, as this site was eliminated during the design phase of the project Site 8: McLeod Street Drop - Kent and McLeod Streets Site 9: Catherine Street Drop - Kent and Catherine Streets Site 10: Chamberlain Shaft - Kent and Chamberlain Streets
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 complete!
View of the tunnel boring machine (TBM) cutter-head breaking through the cliff behind the Supreme Court of Canada
View of the tunnel boring machine (TBM) cutter-head breaking through the cliff behind the Supreme Court of Canada.  
Tunnel boring machine at site 6, showing exit portal and support rails.
Tunnel boring machine at site 6, showing exit portal and support rails.

Site 10: Chamberlain Shaft (Kent/Chamberlain Streets)

Site 10 was the launch shaft for the north-south tunneling operation and, ultimately this shaft will house a chamber which will allow operations staff and equipment to access the tunnel.
 
Site 10 construction activities of interest:
  • Geotechnical monitoring continues.
  • Surface works to support tunneling operations are complete. Equipment being disassembled and transported from site.
  • Work to construct the chamber will begin upon completion of tunneling demobilization, anticipated late Fall 2018. 

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

Site 6 was exit point for the TBM and the northern end of the North-South Tunnel. Potential overflows from the Kent Street Sewer will be diverted to the NST and monitored here. An underground connection and an improved sewer outfall will also be constructed at this location.
 
Site 6 construction activities of interest:
  • Geotechnical monitoring continues.
  • Continued construction of the box culvert to the Ottawa River.
  • Roof installation on the Kent Street Outfall Chamber. 
View overlooking construction site towards the Ottawa River.
View overlooking construction site towards the Ottawa River.  
Side view of TBM moving through the exit portal.
Side view of TBM moving through the exit portal.  

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:
  • Tunnel boring machine (TBM) delivery is complete, with maintenance works ongoing at the surface within the main site (5A/5B).
  • Work continues at the bottom of the 5A shaft to prepare to insert the TBM and begin tunneling.
  • Excavation for the Interceptor Outfall Sewer (existing pipe that directs flow) connection chamber is ongoing.
  • At 5C (the intersection of Queen Victoria and River Lane), tunneling of a diversion sewer to direct flow to the new CSST is underway. 
Cradle for TBM within the starter tunnel at the bottom of the 5A shaft.
Cradle for TBM within the starter tunnel at the bottom of the 5A shaft.
View inside the tail tunnel at the bottom of the 5A shaft showing concrete slab, installed to support tunneling operations.
View inside the tail tunnel at the bottom of the 5A shaft showing concrete slab, installed to support tunneling operations.

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 support and shotcrete application within the shaft at 3A.
  • Continued exterior cladding and interior electrical, mechanical, and plumbing works at the odour control facility (OCF).  
Layout of above ground operations, showing equipment around the 3A shaft, used to support excavation in the shaft.

Layout of above ground operations, showing equipment around the 3A shaft, used to support excavation in the shaft.
Installation of insulation at odour control facility.
Installation of insulation at odour control facility.

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

Work on McLeod Street, near Kent Street, is underway to complete the McLeod relief sewer, and construct underground chambers to convey flows to the NST.

 Site 8 construction activities of interest:
  • Completed rock drilling to support air shaft construction.
  • Utility relocations ongoing, including temporary water servicing. 
Rock drilling operations to construct the air shaft at Site 8.

Rock drilling operations to construct the air shaft at Site 8. 

Site 9: Catherine Street Drop – Catherine Street at Kent Street

Work at the corner of Catherine and Kent Street, will include construction of two underground chambers to convey flows from the existing sewer on Catherine Street to the new CSST. An odour control facility will also be constructed at this location.
 
Site 9 construction activities of interest:
  • Advance work to install a duct for communications infrastructure along Kent Street between Chamberlain and Catherine Streets was completed.
  • Construction activity on site began August 1, with signage and site fencing installation, as well as environmental controls.
  • Pre-excavation grouting (injecting concrete into the rock to help seal against groundwater) is underway. 
Construction signage and fencing at Site 9.
Construction signage and fencing at Site 9. 

Site 1: West End Shaft – LeBreton Flats

Site 1 is the western end of the East-West Tunnel (EWT) and the tunnel boring machine’s final exit point. Ultimately, Site 1 will house a flow diversion chamber, an access point for operations staff and large equipment, and an odour control facility. 
 
Site 1 construction activities of interest:
  • Work completed in advance included shaft excavation and connections to existing sewer infrastructure.
  • Construction activity commenced August 7, with site preparations, signage and site fencing installation, as well as environmental controls to begin construction of the odour control facility (OCF). 

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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