Keswick Water Pollution Control Plant required expan- sion in 2013 to handle the increased demands from population growth in the Greater Toronto Area. The plant expansion included construction of a new efflu- ent outfall into Lake Simcoe. A microtunnel boring ma- chine excavated a major section of the outfall sewer. Jet grouting was employed to pre-treat the very soft clay below an existing 750 mm sanitary sewer prior to the microtunnel bori

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