One of the major sewer trunk lines in Edmonton, Alberta, Canada. SA1A was a segment of the SESS (2,150m). It started at Ellerslie Road and Parsons Road and connected to a new 2.34m ID tunnel at 91 Street and 9th Avenue.
The City of Edmonton tendered 1,300m of the SESS to SCGCC. The SA1A sewer trunk used ID 2,200mm concrete pipes requiring trenchless construction in three stretches. Two sections where the sewer line had to build underneath existing gas utilities and a third section which included micro-tunnelling 262m underneath the Anthony Henday Drive ring road.