Albion Sanitary Trunk Sewer Rehabilitation Study

The Albion Sanitary Trunk Sewer (STS) is a 3 kilometre long, 750 mm diameter, trunk sewer that was constructed in 1960s.  The Albion STS runs adjacent to the Humber STS through the Humber River Valley and the two sewers cross one another at a number of locations (see study area map).

In 2015, the City of Toronto completed the Albion Sanitary Trunk Sewer Rehabilitation Municipal Class EA study, which recommended solutions to address corrosion problems and low flow conditions in the Albion STS and to provide for long-term sanitary servicing needs in the study area.   The preferred solutions included:

• Abandonment of a few sections of the Albion STS that are inaccessible and/or cannot be maintained due to low flow conditions.
• Rehabilitation of a few sections of the Albion STS that will remain in operation due to local sanitary sewer connections.
• Abandonment of a few sections of the Albion STS by diverting sanitary flows to the adjacent Humber STS by constructing new interconnections and maintenance holes between the two sanitary trunk sewers

The review of the 2015 EA study was completed to address comments from the Toronto and Region Conservation Authority on the project that were received after the 2015 EA study’s completion.  Based on the review and re-evaluation of options, the Project File Update report recommends modifications to the project as follows:

• Area B in the Study Area – Construction of a new sewer as per Option 1 in the Project File Update Report instead of tunnelling under the Humber River.
• Area E in the Study Area – Construction of a new sewer instead of rehabilitating the Albion STS from Manholes 11 to 13A and Manholes 14 to 15.