Water: Pressure Sewer Construction

Zinfra employee and ute

Client: South East Water
Location: Mornington Peninsula, Victoria

When South East Water needed infrastructure service providers to deliver the Peninsula Early Connection Option (ECO) sewerage reticulation project, they awarded Zinfra the large Portsea Package “A”. 

The South East Water initiative aims to take existing septic systems out of service and upgrade to a pressure sewerage system. On the southern Mornington Peninsula between Rye and Portsea, more than 16,000 properties currently rely on a septic tank to manage household sewage. With existing septic tank systems often unable to contain household wastewater, poorly maintained septic tanks can pose a risk to public health and the environment.

To address this issue, South East Water is rolling out one of the largest accelerated pressure sewer construction projects in Australian history. With this comes an Early Connection Option (ECO), enabling customers to connect to the new sewerage system earlier than scheduled - in some cases, up to 16 years earlier.

Zinfra’s scope of work involves the horizontal directional drilling, installation and testing of approximately 80km of 50-250mm poly pipe and associated ancillaries.  These ancillaries include:
• Man holes
• Valves
• Vents
• Flushing points
• Connections to the existing “live” sewer, and
• Dosing units, which are part of the valve and allow for chemical addition to control odour.

The work is taking place in five catchment areas: Portsea, Sorrento (A, B and C) and St Andrews. 

The work will be performed on verges, nature strips and along residential streets, so traffic management and community stakeholder management is an important aspect of the project.  A positive experience for the residents is important to encourage them to opt for ECO and realise the benefits of the new, environmentally sound, sewerage system. 

Zinfra is self-performing this work using their own equipment and resources for a large proportion of the project. 

Commencing on 18 November 2013, the large scale project is required to be completed by mid-May 2015.