Melbourne Water is completing upgrade works to the Gardiners Creek main (GCM) sewer, which transfers sewage flows from Melbourne’s inner eastern suburbs to the South Yarra Main (SYM) and ultimately Western Treatment Plant.
The original sections of the GCM were constructed in 1916. It has been extended progressively over time as the population has expanded towards the east.
Asset inspections, undertaken with CCTV in May 2018 and July 2019, identified sections of the sewer in poor condition. Rehabilitation work is required to reduce the risk of asset failure whilst maintaining the required service level.
Why this is important
Upgrading the sewer is an important initiative for the residents of the inner eastern suburbs. It will ensure the sewer continues to provide the community with a secure and reliable sewerage service for decades to come.
This project is part of Melbourne Water's four-year sewer relining and maintenance hole rehabilitation program to upgrade 15 kilometres of ageing sewers across Melbourne. The upgrade will extend the life of the Gardiners Creek Main sewer for at least another 50 years.
What’s happening and when
Melbourne Water will be rehabilitating approximately 2.7km of the GCM. Commencing from Burke Road exit (outbound) of the Monash Freeway to Warragul Road Ashburton.
The rehabilitation of the sewer will involve:
- constructing temporary and permanent access tracks to maintenance holes
- cleaning and relining the sewer by inserting a new plastic sleeve into the existing pipe
- filling the gap between the existing pipe and new sewer liner with cement (grouting)
- rehabilitating ageing and damaged maintenance holes.
We will ensure no impacts or interruptions to your water or sewerage services throughout the upgrade works. To do this, we will install temporary above-ground sewer bypass pipelines to allow local services to keep operating at all times.
Early works will commence in November 2021. Relining works will begin in early 2022 and take about ten months to complete.
Works will be staged, and we will notify residents and businesses before starting and after completing each stage.
Investigations and cleaning: November 2021
Before any relining works can commence, the sewer needs to be cleaned and scanned to assess its condition.
Maintenance hole preparation: February 2022
Removal of ladders and landings from within maintenance holes
Bypass setup: April-August 2022
Set up bypass systems set up in Holmesglen Reserve (April 2022), Great Valley Road (May 2022), Howard Dawson Reserve (June 2022) and Glenburn Bend Park (July 2022)
Relining: April-October 2022
This stage will involve relining the sewer using the selected technique, either UV CIPP or spiral-wound SRP.
Bypass pack down: May-September 2022
Pack down bypass systems set up in Holmesglen Reserve (May 2022), Great Valley Road (June 2022), Howard Dawson Reserve (July 2022) and Glenburn Bend Park (September 2022)
Maintenance hole rehabilitation: October 2022
Reinstate ladders and landings in maintenance holes
Reinstatement: November 2022
We will reinstate road and concrete/sealed surfaces to their pre-existing condition or better.
What to expect
Prior to and during construction, we'll provide information in several ways:
- door knocking directly impacted businesses and residents
- bulletins/newsletters in the surrounding area
- social media
- web page updates
As a guide, we have listed several potential impacts that you may notice during construction.
- Night works are required for most relining works when sewage flows and traffic flows are at their lowest. This makes it the safest time for crews to be working in the busier streets and reduces the impact on the wider traffic network.
- Noise: During work hours, there will be noise from motor vehicles, machinery and generators. Some noise is expected as part of the night works. We will do as much as possible to reduce these impacts, including setting up sound matting around generators and site barriers.
- Odour: Some odour is expected when carrying out the works due to harmless gases escaping maintenance holes when opened. We aim to minimise and localise this as much as possible.
- Traffic, parking, cyclists and pedestrians: There will be temporary changes to traffic conditions, including lane closures, road closures, parking restrictions and alternative driveway access for some properties. Minor detours may be required for pedestrians and cyclists along sections of the Gardiners Creek Trail. We encourage you to be careful around work areas and observe new signs.
- Working hours: Working hours are as follows:
- Night works: 9 pm to 7 am, Sunday to Thursday
- Day works: 7 am to 6 pm, Monday to Friday
- Weekend hours: 9 am to 3 pm Saturdays (if required)
- Some extended work hours may be needed to complete critical work processes. Affected residents and businesses will be informed of this beforehand.
Respecting the heritage and environment: There is no vegetation removal expected. In some cases, we may need to undertake trimming or alterations where trees are located close to the area of works. We will be working closely with Stonnington City Council, Boroondara City Council and Monash City Council.
Utilising 'trenchless' technology
To upgrade the sewer, we will use a trenchless technology technique called ‘relining’. This technology allows us to reline the inside of the existing sewer with new plastic sleeving without having to dig it up, which has a number of benefits, including:
- significantly reducing the impacts to the important cultural and environmental values of the landscape, we are working in
- ensuring that disruptions and inconveniences at street level are kept to a minimum, and residents and businesses don’t have to worry about open trenches on their doorsteps
- allowing upgrade works to be completed more quickly and efficiently compared to traditional trenching methods
- ensuring the structural integrity of the sewer is maintained for decades to come.
Access tracks to maintenance holes
Some maintenance holes are located in steep and difficult terrain; these can be up to 40 metres deep (equivalent to the height of a 15-storey building).
Access tracks for construction vehicles and machinery need to be created to safely and efficiently get to the maintenance holes to complete the works. This may require earthworks in some areas due to the landscape. Some access tracks will remain in place to enable ongoing maintenance activities to be performed safely into the future.
All temporary access tracks will be reinstated and planted over with grasses.
Respecting local heritage and the environment
There is no vegetation removal expected. In some cases, we may need to undertake trimming or alterations where trees are located close to the area of works. We will be working closely with Stonnington City Council, Boroondara City Council and Monash City Council.
Reinstatement of affected areas
After the works are completed, we focussed on reinstating areas affected by our work activities, including re-grassing and re-planting in the local region to rehabilitate disturbed areas. This will be undertaken in accordance with revegetation and reinstatement plans approved by Council and Parks Victoria.
If you would like more information about the Gardiners Creek main sewer project, please contact us on: