Pakenham East Branch Sewer Upgrade
Pakenham East Branch Sewer Upgrade
Pakenham East, Vic
Project Duration
Client
Project Value
The Zinfra-Jaydo-WSP (ZJW) Joint Venture was awarded by South East Water to plan, design and successfully deliver a 5.8km branch sewer and recycle water main in Pakenham East, engaging with landowners, various authorities and various asset owners to successfully deliver this project. It has been determined that Pakenham East will become a major growth area for the South East of Melbourne, projected to have approximately 7,000 residential properties alongside nonresidential developments such as schools, local businesses, a town centre, community facilities and various open spaces, thus the upgrade of the existing infrastructure.
The scope of works includes:
- Approximately 5.8km of branch sewer of 525mm and 600mm external diameter Glass Reinforcement Pipe (GRP) and 718mm external diameter GRP jacking pipe, ranging between 5-8m depth with multiple high-risk crossings
- OD 355mm PE Recycled Water Main and construction of the flow meter pit and non-return valve pit
- Additional work of potable water alongside Ryans Road in Pakenham East
- Management of PFAS contaminated soil
key challenges
- Getting the approval of the Cultural Heritage Management Plan which delays works being continued from Package 1 to Package 2 due to Cultural Heritage artefact identification which will affect panned
construction methodology - Strict conditions under the per and polyfluoroalkyl substances (PFAS) management plan
- Communication with LXRA, Victrack and Metro trains due to crossing an under construction train station in Pakenham
- Crossings under the BassGas pipeline and Dandenong to Morewell Gas Main
Value for money
To meet land requirements and large depths of shafts, SEW and ZJW reached a design and planning solution resulting in continuation of the project in a safe manner, including:
- Ground conditions, methodologies and environment testing were all part of the required assessments and GRP was proposed to reduce project cost and labour hours
- Use of HDD and micro tunnelling for road rail and crossings, saving time and project costs
- Polyfluoroalkyl substances (PFAS) management plan in place to manage contamination
- Global positioning systems used during construction to manage the works in a more advanced manner
