b'PROJECT PROFILEAlong the way, Donnie broke up 10.5ASHBRIDGES BAY TREATMENTthe Don River and Central Waterfront kilometres of shale bedrock approximatelyPLANT (ABTP) OUTFALL Tunnel System, and provide Toronto50 metres underground using a rotatingThe ABTP outfall is a new tunnelledwith additional capacity to handle cutter head to create the tunnel that runsoutfall that will convey and dispersepopulation growth.parallel to the Don River, the City reports,treated effluent from the Ashbridges adding the machine also erected pre-castBay Treatment Plant into Lake Ontario.As of October 2022, the design portion concrete segments to line the new tunnel.Running 3.5 kilometres with a of the new integrated pumping station As of October 2022, North Construction1-km diffuser, the facility will replacewas approximately 90 per cent complete Constructors had completed 80 per centthe ABTPs existing outfall, originallyoverall, with construction nearlyof Stage One of the tunnel in partnershipconstructed in 1947. It will provide the70 per cent complete.with consultant Black & Veatch Canada. plant with greater capacity and enableit to operate under high-designHatch and AECOM are leading theflow conditions.NEW UV (ULTRAVIOLET) development of the second tunnel, theDISINFECTION WASTEWATER Inner Harbour Tunnel, which is expectedA mix of onshore and offshore work isTREATMENT SYSTEMto be completed in 2024. The third isbeing done to install the new outfall. TheThis phase of the DRCW will see a new the Taylor-Massey Creek Tunnel, led byformer includes the construction of ansystem developed to replace the Citys consultant Tetra Tech, which will enter the85-metre-deep shaft measuring existing chlorine disinfection system. It design stage in 2023. 14 metres in diameter, as well as tunnelwill use next-gen UV lamp technology to drilling to connect the outfall to theprovide a more effective, chemical-free When complete, this phase of the DRCWtreatment plant and the restoration ofdisinfection process and incorporate will be comprised of a 22-km systemthe areas impacted by construction.sodium hypochlorite disinfection and with three integrated tunnels, 12 storageOffshore work in Lake Ontario includesdechlorination for excessive flows to shafts, 27 sewer connection points andadditional tunnelling, the construction ofthe plant caused by extreme storms. As seven storage tanks. 50 riser pipes connecting the tunnel withof October 2022, the Ashbridges Bay the lake, and the construction of diffuserTreatment Plant UV Disinfection project ASHBRIDGES BAY ports to disperse treated effluent inLANDFORM PROJECTthe lake.was approximately 80 per cent complete.SITE PREP FOR A HIGH-RATEConstruction on the ABTP hit aDIGGING INTREATMENT FACILITYThis component of the DRCW is a jointsignificant milestone recently withIt will be some time before work finishes initiative between Toronto and Regionthe installation of port protectionon the DRCW, and even more before Conservation Authority (TRCA) and themaintenance holes at all 50 risersthe full ambitions of Torontos WWFMP City of Toronto. It will provide erosion andlocated along the lakebed between are realized. While the team has faced sediment control in Ashbridges Bay and15 to 20 metres under Lake Ontario. Atseveral challenges that have become the new Ashbridges Bay Treatment Plantthe last update, the outfall was nearly typical on any contemporary construction property for the construction of a future75 per cent complete. project (e.g., pricing inflation, labour, combined-sewer overflow (CSO) high-rateconstruction logistics, etc.), itstreatment (HRT) facility.NEW INTEGRATED current stakeholders have risen toPUMPING SYSTEMthe challenges. The $96-million initiative is being carriedA new integrated pumping station is out in partnership with Shoreplanbeing developed on the property southIts been a very successful project from Engineering and, at last check, wasof Lake Shore Boulevard East, whereour standpoint, reports Di Gironimo. halfway to completion. The TRCAit will replace the two older pumping is tracking the transformation at:stations located north of the Boulevard.Weve had excellent performance, https://trca.ca/conservation/green- Once online, it will convey raw sewageprofessionalism and cooperation infrastructure/ashbridges-bay-erosion- from underground sewers into the ABTP,between our contractors and staff, which sediment-control-project/ receive and pump additional flows fromhas kept this project moving.BUILDERSDIGEST Quarter 4 202221'