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Project Update - Combined Sewage Storage Tunnel (CSST) - May 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 below Slater Street.
 
Picture showing a map of Ottawa and an orange line from Stanley Park W to Cumberland, then south along Cumberland before turning west on Waller/ Laurier, going through Confederation Park then down Slater Street, stopping just east of Elgin showing that the east-west tunnel has been completed to this point.
Progress on the east-west tunnel (EWT).
 
Picture showing circular markings similar to a bullseye on large rock face.
View in front of the tunnel boring machine, showing the pattern the cutters create as they grind away rock.
 

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:
  • Backfilling around the OCF exterior walls, and continued interior mechanical and electrical work.
  • Underground chamber formwork within the large shaft.
 
Picture of a large concrete building with construction machinery in front.
View of the OCF, before backfilling, from the access road.
 

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:
  • Rock drilling using a large drill with auger attachment.
  • Excavation of a cavern underground, at the future intersection of the tunnels, is complete and ready for concrete work.

 
Picture showing a large drill, drilling into the ground with construction fencing around the sides.
Rock drilling from the surface using a large drill with auger attachment.
 

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.
  • Landscaping around the OCF, including construction of sidewalks and stairs

 
Picture showing a large building with white and wood siding and grey roof.
Preparation for landscaping around the Odour Control Facility.
 

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:
  • Completed excavation of the shaft and shaft support works.
  • Preparation for installation of a vent shaft on the west side of Cumberland, within the right-of-way.
  • Work to temporarily re-instate the roadway to follow the installation of the vent shaft.
 
Picture showing a repaved construction area, with houses and orange fencing in the background.
Preparing to temporarily reinstate Cumberland Street.
 

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 concrete Interceptor Outfall Sewer chamber is underway, along with installation of a concrete pipe diversion sewer between the main shaft and shaft 5C (the intersection of Queen Victoria Street and River Lane).
  • Concrete and steel work underway for chamber construction within the shaft at 5C.
 
Picture showing underground construction work, with stacked steel beams and a wood platform on the top.
Chamber construction works within IOS 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 through the portal at Site 6.
  • Final works on the NST overflow chamber.
 
Picture showing a construction site containing a large concrete building and Ottawa River in the background.
Overview of Site 6 showing the NST overflow chamber.
 

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:
  • Continued rock breaking at the bottom of the 24-metre-deep shaft, to connect horizontally to the new tunnel below Kent Street.

 
Picture showing a piece of construction equipment working underground from within a cylindrical shaft.
Horizontal rock excavation at the bottom of the Site 8 shaft.
 

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 underground chamber construction from within the North-South Tunnel.
  • Preparation for construction of the second shaft and the OCF.
 

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:
  • Worker access to the NST through the main shaft at Site 10.
  • Preparatory works in advance of chamber construction at Site 10A.
 
Picture of piece of construction machinery breaking concrete floor at the bottom of a large cylindrical shaft underground.
Removal of the concrete slab at the bottom of the 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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