Hobsons Bay Main Duplication Project

The Hobsons Bay Main Duplication Project, commissioned by Melbourne Water and constructed by John Holland Group (JHG), was a 670m long sewer tunnelling project constructed underneath the Yarra River between Port Melbourne and Spotswood. The complete project has allowed Melbourne Water to double the capacity of this sewer main which transports approximately 30% of Melbourne’s wastewater.

John Holland Group engaged the Carbon Reduction Institute (CRI) to undertake a cradle to gate lifecycle assessment of the Hobsons Bay Main Yarra Crossing Duplication Project. The assessed lifecycle was bounded from raw material extraction through to completion of construction activities.

CRI’s Life Cycle Assessment (LCA) methodology followed and complied with the series of international standards for LCA: ISO 14040 and ISO 14044. A third-party verification of this LCA was conducted by Blue Environment, confirming compliance with both standards.

John Holland Group have purchased sufficient carbon credits accredited under the Verified Carbon Standard to offset the emissions caused by the assessed lifecycle of the project. The carbon credit retirements can be found at the following links:

https://registry.verra.org/myModule/rpt/myrpt.asp?r=206&h=237133

https://registry.verra.org/myModule/rpt/myrpt.asp?r=206&h=207554

https://registry.verra.org/app/projectDetail/VCS/2052

The Hobsons Bay Main Yarra Crossing Duplication Project has been certified as a Carbon Neutral Project under the NoCO2 Program. This certification signifies that the Project has been delivered carbon neutral as-built.

Image credits: Melbourne Water