West Vaughn Sewage Tunnel — Ontario, Canada

The Regional Municipality of York (Region) is located within the Greater Toronto area in Ontario, Canada. The Region intends to implement regional sewage servicing in the City of Vaughan, particularly in the west Vaughan area. The objectives of the West Vaughan Sewage Servicing Project are to accommodate future growth servicing demands and provide sustainable wastewater servicing.

Our Role In The West Vaughn Sewage Tunnel Project

We are providing detailed design services for a new sewer main and pumping station upgrade to provide additional capacity for future development in Vaughan.

The work includes the construction of the Tunnel Phase 1 trunk sewer and related shafts. The sewer will be approximately 11 km long with a 3.0 m internal diameter. The sewer conveyance tunnel in the City of Vaughan, Ontario, Canada, will run primarily along Highways 27 and 7 and terminate at the York Region Humber Sewage Pumping Station off Steeles Avenue. The shafts and tunnel will convey sanitary flow from connections at Huntington Road and other local connections to the upgraded Humber Sewage Pumping Station.

The sewer alignment is divided into three segments (South, Central, and West), where tunnel boring machines (TBMs) will be used for excavation, with an internal diameter of 3.0 m and precast concrete segments for tunnel liners.

Notable Services

• Provision of standby emergency power, odour control facilities; and dully automated operations, control, and monitoring integrated with Region-wide SCADA.
• Developed a master chart that captured all permits required on the project, providing a single reference for tracking agency contacts and compiled permit requirements and applications that simplified the control of the permits and approvals process.
• Careful review of as-built records facilitated development of design strategies to incorporate new work with existing facilities thereby saving money on construction and operation.

Tunnel Launch Infrastructure: Scope and Handover

The Tunnel Phase 1 work contract will be preceded by the Humber Sewage Pumping Station advanced contract (Contract A), where a new pump station will be built and commissioned. Construction of the launch shaft (7L) will be part of Contract A’s scope, which will be handed over to the tunnel contractor to be used as the launching point for the South segment drive. The tunnel contractor is to supply two TBMs to execute the 3.0 m tunnel (internal diameter) and the 250 mm thickness precast concrete segments (PCTL) necessary for tunnel lining.