Annacis Island Wastewater Treatment Plant

<div class="ExternalClassAD0470652FDA45E880EC9A49F99B9E28">The Annacis Island Wastewater Treatment Plant is our region’s largest wastewater treatment facility. It receives and treats wastewater from 14 Metro Vancouver municipalities and releases it safely into the Fraser River.Metro Vancouver is increasing the capacity of the current facility to meet the needs of our growing population and ensure it continues to protect public health and the environment.Planned improvements include:<ul><li>Increasing the size of the plant and its ability to treat more wastewater</li><li>Building a new outfall pipe to carry treated wastewater from the plant to the Fraser River</li><li>Repairing or replacing older parts of the existing plant</li><li>Making seismic improvements to reduce the impacts of an earthquake</li><li>Improving existing odour controls</li><li>Building a more reliable backup power source</li></ul>The Annacis Island Wastewater Treatment Plant improvements are happening in multiple phases over several years. A number of upgrades to the treatment plant are complete and in service. The remaining upgrades (listed above) are expected to be complete by the end of 2029. </div>

City of Delta on Annacis Island

Project

The Annacis Island Wastewater Treatment Plant, located in the City of Delta on Annacis Island		https://metrovancouver.org/services/liquid-waste/ConstructionImages/_t/AIWWTP-map_jpg.jpg	The Annacis Island Wastewater Treatment Plant, located in the City of Delta on Annacis Island
Annacis Island Wastewater Treatment Plant - New Outfall Pipe		https://metrovancouver.org/services/liquid-waste/ConstructionImages/_t/aiwwtp-outfall-pipe-map_jpg.jpg	Annacis Island Wastewater Treatment Plant - New Outfall Pipe

Project update

<div class="ExternalClassA121F43E00E44BA6843BBE7383F2F87D"> Upcoming In-river workTwo bulkheads were installed in the riser shaft to isolate the underground structure from the river to protect workers during tunnel construction. These bulkheads now need to be removed to form a connection between the treatment plant and the Fraser River.The bulkhead removal is expected to take place in August 2024. To complete this efficiently, crews will work 24 hours a day, seven days a week, for up to three weeks.Read the full update in our <a href="/services/liquid-waste/ConstructionDocuments/aiwwtp-new-outfall-newsletter-2023-07-17.pdf" target="_blank">July 2024 newsletter</a>. </div>

7/17/2024 7:00:00 AM

Plant improvements

To accommodate population growth, the Annacis Island Wastewater Treatment Plant is undergoing a major expansion to increase treatment capacity to serve 1.5 million people.

There are approximately 20 projects as part of the on-site improvements in various stages of design and construction. This phased expansion includes seismic upgrades, new odour control facilities, a three-story control systems and laboratory building, and a co-generation facility to make better use of green energy captured on site.

The development of a new digester and regional biosolids dryer is underway to enhance solids treatment and help turn the byproducts of wastewater treatment into a renewable alternative fuel for the region’s industries. Both are anticipated to be complete by 2033. The new outfall pipe construction continues and is expected to be in service by 2025.

Outfall

Treated wastewater from the Annacis Island Wastewater Treatment Plant is released into the Fraser River through an existing outfall pipe. A new outfall pipe and diffuser system is being installed, which will involve constructing an approximately 1-kilometre-long tunnel from the plant to the river.

The new outfall location and design will ensure that treated wastewater disperses over a broad area underwater to maximize dilution and minimize environmental impact. The new pipe is expected to meet regional growth needs for the next 100 years while ensuring greater seismic resilience and continuous, reliable, and safe management of the region’s wastewater. Construction began in 2019 and will be completed in 2025.

Outfall	Outfall	<div class="ExternalClassC303FE8D0A824A03AF963A14072A63A6"><p>The new outfall pipe will be excavated using a tunnel-boring machine. This machine will be launched from the entry shaft near the Annacis Island wastewater treatment plant and progress south to the river riser in the Fraser River.</p> <img src="/services/liquid-waste/ConstructionImages/Diffuser.jpg" alt="Diffuser" /> <p>The diffuser system will be made up of one long pipe just under the surface of the river bed that will run parallel to the shore. The diffuser system will release treated water through multiple valves attached to the pipe.</p> <img src="/services/liquid-waste/ConstructionImages/DiffuserPipe1.jpg" alt="Diffuser pipe" /> <p>The image below shows the diffuser system that will be built in the river bed, parallel to the shore to avoid the river navigation channel.</p> <img src="/services/liquid-waste/ConstructionImages/DuckbillDiffuserSystem.jpg" alt="Duckbill Diffuser System" /></div>
Impacts and mitigation	Impacts and mitigation	<div class="ExternalClassA2A2E07234B847569BD9CC758176B976"><p>Most of the construction will occur within the plant's existing boundaries. </p><p>Activities associated with these improvements include:</p><ul><li>Building demolition</li><li>Delivering, excavating and removing soils and other materials</li><li>Additional truck traffic</li><li>Temporary vibrations near the work area </li><li>Noise</li></ul><p>All work will comply with the City of Delta’s noise bylaws or granted variances. Where practical, crews will attempt to reduce noise impacts. Generators may be required to run overnight. Diesel impact pile driving, if required, will be done only during the City of Delta’s regular construction hours.</p> <br></div>
Work hours	Work hours	<div class="ExternalClassFAE12614FA224754A1F93FB18EC0523E"><p>Most of the work will occur during the City of Delta’s regular construction hours: </p><ul><li>Monday to Friday: between 7:00 am and 7:00 pm </li><li>Saturdays: between 9:00 am to 5:00 pm </li></ul><p>Certain construction activities that will not have a significant impact on the surrounding communities will take place 24 hours a day, 7 days a week. Please note that river conditions and flow rates may impact the work schedule. All work will comply with the City of Delta and Vancouver Fraser Port Authority’s granted bylaw variance. </p><br></div>
Engagement	Engagement	<div class="ExternalClassFC5A854F8F024CC985452CDD698014DD"><p>Metro Vancouver is committed to minimizing the impacts of this project on the Annacis Island business community, river users, and First Nations.</p><p>As part of our commitment, Metro Vancouver will:</p><ul><li>Follow permitting and approvals process at the federal and provincial levels</li><li>Work with businesses, First Nations, and government agencies to identify potential project impacts and determine possible solutions</li><li>Develop and implement traffic management plans to ensure traffic flow and property access are not significantly interrupted</li><li>Ensure a number of mitigation measures are in place including environmental monitoring during construction</li><li>Develop and implement a river work plan to ensure construction does not significantly interfere with marine traffic and activities</li><li>Provide regular project updates via newsletters, web updates, and traffic advisories<br></li></ul><p>To review the permit application with the Vancouver Fraser Port Authority, <a href="https://www.portvancouver.com/permitting-and-reviews/per/project-and-environment-review-applicant/status-of-permit-applications/metro-vancouver-annacis-island-wastewater-treatment-plant-new-outfall-system/" target="_blank">click here</a>.</p></div>
Project materials	Project materials	<div class="ExternalClass86A46D2907A64CBA85FAA8460F4B4F41"><ul class="fa-ul"><li><span class="fa-li"><i class="fa-light fa-file"></i></span><a href="/services/liquid-waste/Documents/aiwwtp-new-outfall-fact-sheet.pdf" target="_blank">Fact Sheet - Annacis Island Wastewater Treatment Plant</a><br></li><li> <span class="fa-li"> <i class="fa-light fa-file"></i></span> <a href="/services/liquid-waste/Documents/ai-wwtp-upgrades-project-at-a-glance.pdf" target="_blank">Project at a Glance</a><br></li></ul><h3>Newsletters</h3><ul class="fa-ul"><li> <span class="fa-li"><i class="fa-light fa-file"></i></span> <a href="/services/liquid-waste/ConstructionDocuments/aiwwtp-new_outfall-newsletter-jul-2023.pdf" target="_blank">2023 - July 19 - Project Update</a> </li><li> <span class="fa-li"><i class="fa-light fa-file"></i></span> <a href="/services/liquid-waste/ConstructionDocuments/aiwwtp-new-outfall-newsletter-2023-07-17.pdf" target="_blank">2024 – July 17 – Upcoming In-River Work</a> </li></ul><h3>Other engagement materials<br></h3><ul class="fa-ul"><li> <span class="fa-li"> <i class="fa-light fa-file"></i></span> <a href="/services/liquid-waste/Documents/ai-wwtp-outfall-project-contractor-info-session-presentation.pdf" target="_blank">Engagement Phase 1 - 2017 - Contractor Information session presentatio</a>n<br></li><li> <span class="fa-li"> <i class="fa-light fa-file"></i></span> <a href="/services/liquid-waste/Documents/ai-wwtp-river-users-stakeholder-meeting-display-panels-2017-05-05.pdf" target="_blank">Engagement Phase 1 - 2017 - Marine users Information session panels</a><br></li><li> <span class="fa-li"> <i class="fa-light fa-file"></i></span> <a href="/services/liquid-waste/Documents/ai-wwtp-community-forum-panels-2018-11-17.pdf" target="_blank">Engagement Phase 2 - 2018 - Community forum panels</a></li><li> <span class="fa-li"> <i class="fa-light fa-file"></i></span> <a href="/services/liquid-waste/Documents/ai-wwtp-update-presentation-2020-02-06.pdf" target="_blank">Engagement Phase 3 - 2020 - Marine users information session presentation</a><br></li></ul></div>

Annacis Wastewater Treatment Plant with outfall	https://metrovancouver.org/services/liquid-waste/ConstructionImages/_t/aiwwtp-outfall-map_jpg.jpg	Annacis Wastewater Treatment Plant with outfall
Location of plant upgrades and outfall	https://metrovancouver.org/services/liquid-waste/ConstructionImages/_t/AIWWTP-new-outfall-pipe-project-map_jpg.jpg	Location of plant upgrades and outfall
Outfall tunnell route	https://metrovancouver.org/services/liquid-waste/ConstructionImages/_t/aiwwtp-outfall_tunnel_route-graphic_jpg.jpg	Outfall tunnell route

Outfall Diffuser Arm at Annacis Island Wastewater Treatment Plant	Outfall Diffuser Arm at Annacis Island Wastewater Treatment Plant		780911724
Annacis Island WWTP Outfall TBM	Annacis Island WWTP Outfall TBM		744770886

Completion in 2025	Completion in 2025	<div class="ExternalClassCAFB961C3BBC47008E3FE7DE05ED09A5"><p>Outfall </p></div>	1
Completion in 2029	Completion in 2029	<div class="ExternalClass43372E5A21D349F88DA4D0A65BBAC72F"><p>Overall plant improvements <br></p></div>	0
Completion in 2033	Completion in 2033	<div class="ExternalClass320C796F77AD490A85BCCB8884F9A83C"><p>Regional biosolids dryer <br></p></div>	0
Completion in 2033	Completion in 2033	<div class="ExternalClass1A54E7881D1D48F682DF0AA0F6527B43"><p>New digester <br></p></div>	0

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