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Abstract: Construction of Contract 2 for the twinning of the West Trunk sewer tunnel for the Region of Peel in the City of Mississauga consists of approximately 3,800m (12,500ft) of 3.0m (10ft) diameter trunk sanitary sewer. The new sewer is being constructed by tunneling using two EPB machines and installing precast concrete segments as the final liner. Two significant innovations are included in the...