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Project Update - Combined Sewage Storage Tunnel (CSST) - February 2019

 
Picture of the Ottawa River, showing Parliament in the background.
 

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 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 (NST) 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!
 
Picture showing a map of Ottawa and an orange line from Kent and Chamberlain north along Kent Street to behind the Supreme Court of Canada showing that the north-south tunnel has been completed.
Progress on the north-south tunnel (NST).
 

East-West Tunnel (EWT)

 
Tunneling of the East-West tunnel from Stanley Park to LeBreton Flats (Site 5 to Site 1) is underway, and progressing under Cumberland Street through the Lowertown area toward Sandy Hill. The tunnel boring machine (TBM) is several storeys below Cumberland Street in the vicinity of George Street.
 
Picture showing a map of Ottawa and an orange line from Stanley Park south to Rideau Street showing the east-west tunnel has been completed to that point and a green dotted line showing the entire alignment traveling south along Cumberland Street then heading West on Laurier and up to Slater Street and ending in LeBreton
Flats.
Progress on the east-west tunnel (EWT).
 
Picture of a concrete tunnel showing tracks on the bottom.
View inside the completed portion of the east-west tunnel (EWT).
 

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 (OCF).

Site 1 construction activities of interest:
  • Continued construction of the OCF walls.
  • Excavation of the shaft is complete and awaiting TBM arrival.
 
Picture of construction of a building showing large concrete walls.
Construction of the OCF walls.
 

Site 2: East-West Tunnel/North-South Tunnel Intersection – Kent and Slater Streets

 
Site 2 is where the two tunnels intersect. Preparations for construction of an underground access chamber at this location have begun.

Site 2 construction activities of interest:
  • The wild winter weather delayed mobilization a bit; however, traffic control measures are now in place.
  • Utility relocations (gas, water, lighting, etc.) are underway.
  • Continuing underground chamber construction preparations at the future intersection of the North-South Tunnel.

 
A construction site in the middle of a city street.
Installation of site fencing on Slater Street.
 

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

 
Construction of a new underground diversion chamber drop structure and odour control facility 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 construction of the underground chamber.
  • OCF exterior works complete and interior electrical, mechanical, and plumbing works continue.

 
Picture of construction at the bottom of a large rectangular shaped hole below ground.
View of chamber construction activity within the shaft.
 

Site 3B: Rideau Canal Regulator – Rideau Canal

 
Work has commenced on the existing Rideau Canal Regulator in order to ensure operational efficiency of the CSST.

Site 3B construction activities of interest:
  • Underground maintenance and modifications within the existing Rideau Canal Regulator are underway.
 
A picture showing orange fencing being put up on one side of a pathway, under a concrete bridge.
Installation of fencing at the Rideau Canal Regulator.
 

Site 3CR: Wilbrod Shaft – Cumberland Street at Wilbrod Street

 
Construction of an underground access chamber and Odour Control Facility (OCF) is underway at this location.

Site 3CR construction activities of interest:

  • Site signage and traffic control remain in place.
  • Day-time excavation of the shaft underway, using a large drill with an auger attachment.
 
A picture showing a large piece of construction machinery drilling into the ground.
Shaft excavation using large drill on Cumberland Street.
 

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

 
Construction continues in New Edinburgh's Stanley Park, where the tunnel boring machine has started its east-west journey, and at the intersection of Queen Victoria Street and River Lane (to connect to existing overflow sewer infrastructure).

Site 5 construction activities of interest:
  • Tunneling support operations on the surface, at 5A (the main site).
  • Construction of the Interceptor Outfall Sewer chamber is underway, including installation of rebar and concrete.
  • Additional rock removal in preparation for installation of concrete pipe within diversion sewer between shafts, at 5B and 5C (the intersection of Queen Victoria and River Lane).
 
A picture showing a cylindrical pipe running across the bottom of a large cylindrical shaft.
View inside the Interceptor Outfall Sewer shaft.
 

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

 
Site 6 was the exit point for the tunnel boring machine 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:
  • Continued installation of rebar and concrete for the NST overflow chamber.
 
A picture showing large construction machinery and a concrete structure being assembled.
Construction of the NST overflow chamber. 
 

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:
  • Excavation of the deepest shaft using drilled auger method is complete.
  • Earth excavation at the second shaft is underway.

 
A picture of excavation of a rectangular shaft below the surface and piece of construction equipment.
Excavation of a second shaft, using an excavator.
 

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:
  • Continuing underground chamber construction preparation preparation (in the North-South Tunnel).
  • Sheet pile installation (for shoring support system) is complete.
  • Earth excavation at the second shaft is underway.
 
A picture showing a large piece of construction equipment removing dirt from inside a rectangular fence.
Excavation of a second shaft, using an excavator.
 

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:
  • Work continues within the North-South Tunnel, with access through the main shaft at Site 10.
  • Preparatory works in advance of chamber construction at site10A.
 

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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