Alkimos Seawater Desalination Plant Investigations

Following more than 18 months of feasibility investigations, supported by stakeholder and community engagement, the Water Corporation has referred two desalination plant proposals to the Federal Department of Environment and Energy (EPBC Act) and the Western Australian Environmental Protection Authority for assessment.

The proposals: Alkimos Seawater Desalination Plant and Perth Seawater Desalination Plant 2 (in Kwinana), are part of long term planning to secure Perth’s water supply, with current planning indicating a new water source may be needed for Perth within the next 5-10 years.

To learn more about the proposals and stay updated as assessments progress, including period of public comment, visit: https://yoursay.watercorporation.com.au/future-perth-desalination-plants.

Completion of offshore investigations

Water Corporation has completed its Alkimos offshore investigations and will now demobilise the marine jack-up barge from the Alkimos area.

The Corporation thanks the Alkimos community and marine stakeholders for their patience during the work, which is being considered as part of feasibility investigations for a seawater desalination plant at Alkimos.

The barge will commence its journey to Henderson when conditions are favourable, depending on conditions this could take upwards of 3 weeks.

Wastewater Treatment Plant Ocean Outfall maintenance

In coming weeks the Corporation will complete maintenance work on the Alkimos Wastewater Treatment Plant ocean outfall.

The work is planned for completion over 2-3 days, pending weather conditions and will involve divers and a vessel being positioned above the pipeline. Flags and required signage will be in place to advise other vessels to the work.

Operation of the wastewater treatment plant will not be interrupted during the work.

For more information phone 9420 3488 or email community.engagement@watercorporation.com.au.

As part of our long term planning to secure Perth’s water supply, we are nearing the completion of feasibility investigations, and will soon seek environmental approvals, for a seawater desalination plant at Alkimos.

Thank you to the hundreds of people who attended community events in 2018 or provided feedback online. We value your input, it has allowed us to address community interests and concerns in our planning.

The Alkimos Seawater Desalination Plant is one of a number of options being investigated to secure Perth’s water supply for the future, which also includes investigating a second seawater desalination plant in Kwinana. While we may not need a new water source for five to ten years, communicating with you along the way is important to us.

You can find out more about our investigations and share your feedback with us by completing a short survey. By completing the feedback survey and registering your details with us, you can stay informed as the project progresses.

Residents and visitors to Alkimos Beach may notice a large offshore drilling barge as it mobilises to the area on November 12 .

The barge will drill small core sample holes to collect information on the seafloor and geology beneath the sea bed. This information is important to selecting the most appropriate location of and construction method of offshore parts of the potential plant.

The barge is expected to be in the area off the Alkimos coast until late December. Work will be completed seven days a week (weather depending).

Vessels are advised to maintain a safe distance of no less than 25 metres from the drilling rig. A marine exclusion zone will be in place during the work. A map of the work area and further information is available here.

Access to Alkimos Beach for fishing, swimming or recreating will not be impacted. A seismic survey of the area is planned to be complete by mid-November.

A marine exclusion zone will remain off the coast off Alkimos until the end of October while seismic surveys are completed.

The work, which started in late September, has involved specialised vessels transiting the area to collect information about the seabed, which is being collected as part of investigations underway in relation to a possible future Alkimos seawater desalination plant.

Weather delays have affected the completion of the work.

Once the survey is complete, a core sample drilling program will begin. A large offshore drilling rig might be seen from the coastline. This work is planned to take about five weeks from early / mid-November. An exclusion zone will be in place for the area surrounding the rig, delineated by four yellow buoys.

Water Corporation appreciates the patience of the community, including boaters and fishers, while we complete the work.

A temporary marine exclusion zone will be in place off the Alkimos coast from 17 September, 2018 for up to three months while we complete a seismic survey and core sample drilling as part of our feasibility investigations.

The surveys will help us understand the subsea geology and where and how the intake and outfall pipelines for the potential future seawater desalination plant may be located and installed.

The seismic survey, which will be completed by a specially equipped vessel, will be completed first, followed by the core sample drilling, which will be completed using a jack up barge. Once the seismic survey is complete the temporary exclusion zone will be limited to within 25m of the rig and be identified by buoys equipped with flashing yellow lights.

Recreational fishers and boaters are reminded to please stay clear of the exclusion zone and ensure all fishing equipment is removed by 16 September to prevent it being damaged. Beach access will not be affected by the work and the rig may be visible from the shoreline.

For more information, coordinates and a map of the exclusion zone please click here.

We will be joining Lendlease and other government departments and agencies at the Alkimos Information Showcase event on Sunday, August 19 from 11am to 2pm. Come visit the Water Corporation stall to learn about our plans for Alkimos or for some great waterwise information and tips.

Possible future Alkimos Seawater Desalination Plant Project Update June 2018

Public comment opens: offshore investigations

We are planning on completing a seismic survey and core sample drilling to help us understand the offshore geology and where and how the intake and outfall pipelines for the potential plant may be located and installed. During this work, which will involve vessels with specialised equipment and a jack up barge, marine exclusion zones will be in place to ensure the safety of workers and the community.

We have submitted for the environmental approvals necessary for this work. As part of this approval a public comment period is open until 5 July, 2018. To find out more about this work you can read an information sheet here. To read our approvals documentation or to submit a public comment visit http://epbcnotices.environment.gov.au/invitations/ (Reference: 2018/8224)

Meet the Team: Community conversations at the Sprout Hub

Members of the investigations team will be at the Sprout Hub café (at Bristlebird Park Providence Drive & Sanderling Street, Alkimos) for informal conversations and a chance to learn more about the feasibility studies.

Our next sessions will be Thursday, June 28 from 9.30am to 11.30am and Tuesday, July 10 from 1.30pm to 3.30pm You can also call us anytime by contacting Community Engagement Senior Advisor Tarryn Truscott via email to community.engagement@watercorporation.com.au or phoning 9420 3488.

In the News

The investigations recently featured in this news article: Public feedback sought on potential Alkimos desalination plant (Source: North Coast Times, 25/5/2018).