The City of Toronto has completed a Municipal Class Environmental Assessment (EA) Study to address problems and opportunities with the Dufferin Sanitary Trunk Sewer (STS) in the Dufferin Street and Finch Avenue West Area. The objective of the study is to provide recommendations for the possibility for rehabilitation and/or relocation within the study area.

Following consultation with City Divisions and the public, the following are the study’s key findings, accepted by the city:

  • Bring the Dufferin STS into a state of good repair
  • Re-align the Dufferin STS out of the G. Ross Lord Reservoir, along Finch Ave. W., between Dufferin Street and Don River West Branch
  • Abandon the existing Dufferin STS and the West Don STS beneath the G. Ross Lord Reservoir, which will be out of service after re-alignment of the Dufferin STS
  • Rehabilitate the existing Dufferin STS south of Finch Ave. W.

The study was carried out following the requirements for Schedule B projects under the Municipal Class EA process. A Project File Report was placed on public record for a 30 day review period starting April 26, 2018 and ending May 28, 2018. The 30 day review period is now complete.

Dufferin Sanitary Trunk Sewer Environmental Assessment Study Area Map
Dufferin Sanitary Trunk Sewer Environmental Assessment Study Area Map

Built in the early 1960s, the Dufferin STS is part of the City’s Don Sanitary Trunk Sewer Collection System. Sections of the Dufferin STS in the Dufferin Street and Finch Avenue West area are located under the G. Ross Lord Reservoir, which was built in 1973 to reduce the risk of flooding to downstream communities.

As a result of the Dufferin STS’ deterioration over the years and its alignment under the reservoir, there is a significant amount of infiltration and inflow of stormwater into the trunk sewer and there are trunk sewer sections and manholes that are inaccessible for maintenance, which poses operational challenges.

Notice of Study Commencement – Issued Nov. 24, 2016

Notice of Public Information Event – Issued Nov. 17, 2017

Please join us at a Public Drop-in Event for the Dufferin Sanitary Trunk Sewer (STS) System Improvements Municipal Class EA Study. You will learn about the study’s problems and opportunities, the options considered, and the recommended system improvements for the Dufferin STS within the study area (see study area map).

The drop-in format of the event will provide you with an opportunity to view display boards, speak with study team members, and provide feedback on the evaluation of options and the recommended system improvements, which include rehabilitation works and the possibility for realignment of Dufferin STS sections. Details are as follows:

Thursday, December 7, 2017 from 6 p.m. to 8 p.m.
Herbert H. Carnegie Centennial Centre
580 Finch Ave. W.
Toronto, ON M9M 3A3

Notice of Study Completion – Issued April 26, 2018 

A Public Drop-in Event for the Dufferin Sanitary Trunk Sewer (STS) System Improvements Municipal Class EA Study was held on December 7, 2017.

The public was given the opportunity to learn about the study’s problems and opportunities, the options considered, and the recommended system improvements for the Dufferin STS within the study area.This EA study / PIE does not address basement flooding.

Below are the Display Boards and other materials from the event:

To request assistance reading the above files, please email or contact Khatija Sahib at 416-392-2962 / Khatija.Sahib@toronto.ca.

The study was carried out following the requirements for Schedule B projects under the Municipal Class EA process. A Project File Report was placed on public record for a 30 day review period starting April 26, 2018 and ending May 28, 2018. 

The 30 day review period is now complete.

To request assistance reading the Project File Report below, please email or contact Khatija Sahib at 416-392-2962 / Khatija.Sahib@toronto.ca.

What is a Class Environmental Assessment?

Ontario’s Environmental Assessment (EA) program promotes good environmental planning by determining and managing the potential effects of a project prior to implementation.

The EA program ensures that public concerns are heard. EA balances economic, social, cultural and natural environmental needs so that projects benefit Ontario.

This study is being carried out according to the Municipal Class Environmental Assessment process. This is an approved approach to satisfying requirements of the Environmental Assessment Act specifically tailored to municipal infrastructure. The process includes identifying the problem or opportunity to be addressed, developing and evaluating a range of alternative solutions, providing opportunities for public input and identifying a preferred solution.