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Underground Lunch and Learn: Planning and Design of the New Ashbridges Bay Treatment Plant Outfall for the City of Toronto
March 6 @ 12:00 pm - 1:00 pmFree, Lunch Provided
Planning and Design of the New Ashbridges Bay Treatment Plant Outfall for the City of Toronto
The Ashbridges Bay Treatment Plant (ABTP) Outfall project by the City of Toronto involves construction of a new tunneled outfall that will convey treated effluent (water) from the ABTP into Lake Ontario. This new outfall will be built to allow cessation of operations of the existing outfall which is reaching the end of its service life and has limited hydraulic capacity.
This presentation is on the planning and design of the project including discussions of challenges such as optimization of the risers, meeting regulatory requirements, addressing underground construction in rock known to exhibit time dependent behavior and riser construction in deep soft ground lakebed deposits overlying bedrock. Ashbridges Bay is a reclaimed lagoon east of the Don River with near- surface onshore materials consisting of landfill material deposited in the early part of the 20th century. The project area is underlain by the Upper Ordovician Georgian Bay Formation, a greenish to bluish grey non- calcareous shale.