To date, the upgrade of the S1 main sewer has involved replacing or modifying existing maintenance holes and relining sections of the pipe along Kingsford Smith Drive and Ann Street. Vital maintenance is now required along Breakfast Creek Road, Newstead to improve performance and ensure the stability of the network.
The sewer was relined in stages, using a polyethylene liner reinforced with steel ribs to renew the structural integrity and flow capacity of the pipeline.
Maintenance holes used to access the sewer are generally located on the edge of the road or in the median, in high traffic volume areas. In addition, flow levels in the sewer line are lower at night and gas levels are reduced.
To ensure the safety of workers and minimise traffic disruptions, work on the S1 sewer has to be done at night from Sunday to Thursday between 8pm and 5am.
Please note: Crews will endeavour to complete high noise activities as early as possible each night (subject to weather and site conditions).
Prior to relining, the sewer will be cleaned and inspected for up to four weeks. Relining of the S1 sewer line will be completed in non-consecutive segments, each lasting approximately four to six weeks (subject to weather and site conditions).
What can the community expect?
To ensure the safety of workers, the pipeline will need to be ventilated at various times and some odour may be detected when this occurs. The odour will be monitored and mitigated, to the extent possible, without compromising safety.
Depending on the location of the maintenance holes, at least one traffic lane will need to be closed at night between 8pm and 5am during relining. Traffic controllers will manage traffic flow and local access under an approved traffic guidance scheme. All lanes will reopen by 5am daily.
Relining also involves noise generating activities, including:
- water pressure cleaning powered by a compressor
- breaking bitumen around the maintenance hole using a jackhammer and removing concrete
- installation of a steel road plate each night to cover the works prior to reopening the road for daytime traffic
- installation of winding machinery including levelling the base of the hole if required
- spiral winding work, including the use of motorised air circulation fans for ventilation
- cement grouting powered by a compressor
- CCTV inspection and reinstatement of the maintenance hole and road at completion.
How will the impacts be managed?
The project team will minimise the impacts by:
- programming works at night between 8pm and 5am to minimise traffic impacts
- managing noise levels at source with sound barriers, where possible
- completing high noise activities as early as possible each evening, site conditions permitting
- housing some equipment in a container onsite to reduce noise, to the extent possible
- monitoring and mitigating odour, to the extent possible, without compromising safety
- reinforcing site protocols about noise mitigation e.g. minimising loud voices
- using compressors with in-built noise suppression
- reviewing work methods regularly to identify if additional measures can be implemented to further reduce impacts.
For information about the S1 trunk sewer relining project, you can:
- read the project fact sheet
- contact the project team on 3855 6742 during business hours or email email@example.com
- phone 13 23 64 after hours
We appreciate your patience and understanding during this essential work.