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Project Update - Combined Sewage Storage Tunnel (CSST) - August 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 for the combined sewage storage tunnel (CSST) is now more than 90 per cent complete, and east-west tunneling is expected to be finished this fall.
 
Picture showing a map of Ottawa and an orange line from Stanley Park West to Cumberland, then south along Cumberland before turning west on Waller/ Laurier, going through Confederation Park then down Slater Street, stopping between Bay and Bronson showing that the east-west tunnel has been completed to this point.
Progress on the east-west tunnel (EWT).
 
Picture showing pieces of rock in large pile inside of a rectangular bin.
A picture showing a rectangular bin full of small pieces
of rock being removed from a large cylindrical shaft using a crane.
Removal of excavated material from within the 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. This location includes 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 exterior finishes and interior mechanical and electrical works at the odour control facility.
  • Completed preparation of large shaft for TBM arrival and removal, upon completion of the EWT.
 
A picture showing a small concrete building being built beside a gravel path.
Roof installation works on the odour control facility.
 

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

 
Site 2 is where the two tunnels intersect, and will include an underground access point.

Site 2 construction activities of interest:
  • Completed shotcreting inside the excavated shaft.
  • Commenced partial sidewalk reinstatement works on Slater Street.

 
A picture looking down into a large underground cylindrical concrete shaft.
Shotcreting operations within the shaft.
 

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

 
Excess flows from the existing Rideau Canal Interceptor will be diverted to the EWT at this location, which requires construction of a new underground diversion chamber drop structure and odour control facility.

Site 3A construction activities of interest:
  • Continued construction of the underground chamber, at the bottom of the shaft.
  • Continued landscaping works around the OCF.

 
A picture looking down into a large rectangular underground concrete shaft, with concrete being pumped into the bottom portion.
Backfilling operations within the lower chamber of the 3a shaft.
 

Site 3B: Rideau Canal Regulator – Rideau Canal

 
Work is necessary on the existing Rideau Canal Regulator at this location in order to ensure operational efficiency of the CSST.

Site 3B construction activities of interest:
  • The CSST contractor has demobilized, but is expected to return for a few days later this fall to complete work.
 

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

 
This site requires construction of an underground access chamber.

Site 3CR construction activities of interest:
  • The CSST contractor has demobilized but will return in September 2019 to continue construction of the underground chamber at this location.
 

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

 
Site 5 in New Edinburgh's Stanley Park is where the tunnel boring machine started its east-west journey, and work includes an underground connection to existing overflow sewer infrastructure at the intersection of Queen Victoria Street and River Lane.

Site 5 construction activities of interest:
  • Tunneling support operations continue on the surface, at 5A (the main site in Stanley Park).
  • Construction of the maintenance shaft at 5B is complete.
  • Chamber construction continues at shaft 5C.
 
A picture looking down into a large rectangular underground shaft showing a concrete pipe going across the middle and a series of metal rods along the top.
Chamber construction works within the 5c shaft.
 

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

 
Site 6 was the first 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, requiring an underground connection and an improved sewer outfall.

Site 6 construction activities of interest:
  • Worker access to the NST and NST/EWT intersection continues through the portal at Site 6.
  • Backfilling around the site is ongoing.
 
A picture looking at a construction site with a large rock pile to the left, yellow loader carrying rock in the background, and the Ottawa River and buildings beyond that.
Backfilling works beside the Ottawa River Pathway.
 

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

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

Site 8 construction activities of interest:
  • Completed rock breaking at the bottom of the 24-metre-deep shaft, to connect horizontally to the new tunnel below Kent Street.
  • Preparation for installation of precast concrete piping within the horizontal excavation.

 
A picture take from within a newly excavated underground tunnel, showing dirt on it’s interior, a string of lights along each side, and an opening in the distance.
View inside the horizontal deaeration chamber looking towards the NST connection.
 

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

 
Work at the corner of Catherine and Kent Street includes construction of two underground chambers to convey flows from the existing sewer on Catherine Street to the new CSST, as well as an odour control facility.

Site 9 construction activities of interest:
  • Continued works at the second shaft location to connect to existing infrastructure.
  • Commenced construction on the odour control facility including masonry, roofing and exterior finishes.
 
A picture showing a concrete building being constructed, with steel and wood scaffolding erected around it.
Masonry and roofing works on the odour control facility.
 

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:
  • Continued chamber construction works, including completion of base slab and commencement of wall concrete works.
  • Continued access to the NST from this location.
 
A picture looking into a large cylindrical concrete shaft showing a wood base at the bottom and stairs from the surface down to the bottom.
Chamber formwork installation within the site 10 shaft.
 

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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