Metro Vancouver | Annacis Island Wastewater Treatment Plant New Outfall System

January 22, 2018

Project status
Permit amendment issued

On February 7, 2022, an amendment PER No. 17-093-03 was issued to Metro Vancouver. The amendment approved the request to allow for construction and physical activities outside of the hours stated in the revised Permit condition no. 32 of PER No. 17-093-02. The Annacis Island Wastewater Treatment Plant New Outfall System is located in Delta, British Columbia in federal waters managed by the Vancouver Fraser Port Authority.

About the amendment:
Construction outside of regular hours will allow for a continuous concrete pour of 48 hours and heavy lifting activities that require flexible hours to ensure work can be completed in a safe and timely manner. These works are not associated with tunnel advancement. In-water works are scheduled to take place 24 hours a day, 7 days a week for the following activities and dates:

    • continuation of cofferdam and river riser construction – March 1, 2022 to June 15, 2022
    • outfall arm construction – June 16, 2022 to March 31, 2023

Permit amendment issued

On March 22, 2021, the Vancouver Fraser Port Authority issued an authorization to Metro Vancouver for the continuation of construction and physical activities outside of standard construction hours (as set out in Permit condition No. 32). Construction work will be allowed 7 days a week, 24 hours a day, from April 15 to June 15, 2021. Metro Vancouver also has an existing authorization for construction outside of standard hours between June 16, 2021 to February 28, 2022.

On March 10, 2019, a project permit was issued to Metro Vancouver for the Annacis Island Wastewater Treatment Plant New Outfall System in Delta, British Columbia in federal waters managed by the Vancouver Fraser Port Authority.

The project was approved subject to 46 permit conditions which Metro Vancouver must meet to ensure the project does not result in significant adverse environmental effects.

For more information about the project and construction activities, please go to Metro Vancouver’s website.

About the project

Metro Vancouver proposes to construct a new outfall system in the Fraser River as part of upgrades to increase the secondary treatment capacity of the Annacis Island Wastewater Treatment Plant. The new outfall system will replace the existing outfall which was constructed in 1974 and does not provide the required capacity nor meet current design criteria with respect to seismic requirements and dilution requirements. The new outfall system has been designed with an increased capacity to serve current and future treatment plant upgrades, achieve required dilution ratios, and meet seismic criteria. Project components located on lands and waters administered by the port authority include a section of the outfall tunnel, the river riser, and the diffuser manifold.

Proposed project activities and components include:

  • Construction of a new outfall tunnel with an inside diameter of 4.2 m, utilizing a Tunnel Boring Machine (TBM);
    • The tunnel will extend from a shaft located on the upland to a river riser shaft located approximately 160 m south of the north bank of the Fraser River. The tunnel will be approximately 30 m below the ground surface on the upland and 15 m below the riverbed
  • Construction of a river riser, consisting of a vertical steel riser pipe and riser cap within a concrete support structure. The support structure consists of a concrete block, approximately 12 m by 19 m, founded on 24 concrete-filled steel piles with a diameter of 760 mm (30 inches);
  • Dredging to a depth of approximately 4.5 m below the riverbed to facilitate the installation of two diffuser manifolds, each approximately 130 m long and 2.5 m in diameter;
  • Placement of bedding material (sand and gravel) at the base of the trench, with subsequent installation of pre-assembled sections of the diffuser manifolds. Once the diffuser manifolds are installed, the trench will be backfilled with river sand and covered with armour rock;
  • Installation of concrete diffuser protective covers and flexible diffuser ports with check valves; and
  • Once the new outfall is commissioned, the existing outfall will be rehabilitated by installing new flexible valves on top of the existing 21 steel riser pipes to allow it to serve as an emergency influent bypass.

Construction is expected to take approximately 3 years.

Resources

March 2021 – Construction notification (PER No. 17-093): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2021 – Authorization letter (PER No. 17-093): Metro Vancouver AIWWTP New Outfall System [PDF]
May 2020 – Construction notification (PER No. 17-093): Metro Vancouver AIWWTP New Outfall System [PDF]
April 2020 – Amendment letter (PER No. 17-093-01): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2019 – Approved Project Permit (PER No. 17-093): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2019 – Project and Environmental Review Report: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Form: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Report: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix A Design Drawings: Metro Vancouver AIWWTP New Outfall System [PDF]

March 2018 – Project Permit Application Appendix B.1 Part A Geotechnical Data Report (Report): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.1 Part B Geotechnical Data Report (Appendix A, Boring Logs): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.1 Part C Geotechnical Data Report (Appendix A, CPT Logs): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.1 Part D Geotechnical Data Report (Appendix B): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.1 Part E Geotechnical Data Report (Appendix C): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.1 Part F Geotechnical Data Report (Appendix D): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.1 Part G Geotechnical Data Report (Appendix E): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.1 Part H Geotechnical Data Report (Appendix F): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.1 Part I Geotechnical Data Report (Appendix G, Primary Testing): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.1 Part J Geotechnical Data Report (Appendix G, Secondary Testing): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.1 Part K Geotechnical Data Report (Appendix H): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.2 Seismic Design Criteria: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.3 1D Ground Response Analysis: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix B.4 2D Ground Response Analysis: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix C.1 Overview of Fluvial Geomorphology: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix C.2 Hydraulic Process and Alterations Report: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix D Works Protocol: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix E.1 Traffic Impact Study: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix E.2 Traffic Management Guideline: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix F.1 Marine User Information Session: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix F.2 Navigation Impact Assessment: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix G.1 Fish Related Dredging Impacts and Mitigation: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix G.2 Sediment Characterization Report: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix H.1 Noise Assessment Screening Worksheet: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix H.2 Baseline Enviromental Noise Study: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix I Part A Outfall System Options Analysis (Report): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix J.1 Part A Geo-Environmental Assessment Report (Report): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix J.1 Part B Geo-Environmental Assessment Report (Appendices): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix J.2 Construction Environmental Management Plan: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix K.1 Stage 1 Enviromental Impact Study: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix K.2 Part A Stage 2 Environmental Impact Study Report: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Appendix K.2 Part B Stage 2 EIS Report Appendix A (Report with Attachments A to D): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Appendix K.2 Part C Stage 2 EIS Report Appendix A (Attachments E to J): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix K.2 Part D Stage 2 EIS Report (Appendix B to F): Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix L.1 Habitat Assessment: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix L.2 DFO Request for Review Application and Report: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix L.3 DFO Correspondence: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix L.4 DFO Request for Review Supplemental Report: Metro Vancouver AIWWTP New Outfall System [PDF]
March 2018 – Project Permit Application Appendix M Meeting with Delta Fire and Emergency Services: Metro Vancouver AIWWTP New Outfall System [PDF]

Contact information

For more information about Metro Vancouver’s proposed project, please go to their website or contact Ken Massé by email or phone at 778.452.2627.

For questions regarding the Project and Environmental Review of the project, or to get in touch with our team, please contact us by email or phone at 604.665.9047.