As one of Canada’s oldest cities, Toronto is constantly working towards rehabilitating or replacing its aging infrastructure assets. As such, Toronto Water initiated the Trunk Sanitary Sewer Program in 2009 with the intent of providing a comprehensive inspection and condition assessment of this major waste water management infrastructure. The diameter of the sewer varies from 525 mm to 1200 mm with a section of 675 mm and 1200 mm pipe built with cement blocks. An inspection of the sewer revealed several issues over 1 km, including significant infiltration, calcium build-up, cracked and broken pipes. Furthermore, some sections of the cement block pipe were starting to fail, namely those running under an existing CN rail line, and others in the Toronto and Region Conservation Authority (TRCA) regulated areas. CIMA+ undertook the design of rehabilitation solutions to ensure an additional 50 years of design life for the 40th Street Sanitary Trunk Sewer (STS) through the application of trenchless technologies, including cured in place pipes and maintenance hole rehabilitation. This project won the 2018 Public Works Project of the Year – Structures Award from the Ontario Public Works Association (OPWA).