Construction

The construction of the proposed Victorian Renewable Energy Terminal will require landside and marine works

Key construction activities

The landside works would include:

  • The clearance of the Old Tyabb Reclamation Area (OTRA) site
  • Establishment of site offices, warehouse and car parks
  • Ground improvement works
  • Installation of services
  • Laying of pavement

The marine works would include:

  • Dredging and scour protection
  • Reclamation
  • Construction of the Quay Wall (the retaining structure)

Construction phases

The construction of the Terminal can be divided into four main phases with activities occurring concurrently over an estimated 3 years, as follows:

  • Mobilisation
  • Landside works (on the OTRA site)
  • Dredging and reclamation
  • Marine and Quay Wall construction

Reclamation

The reclamation process would operate in parallel with the marine and quay wall construction operations and the dredging program.

The reclamation process will include the following key steps:

  1. Installation of silt curtain
  2. Construction of perimeter bunds
  3. Installation of rock revetment on the outer face of perimeter bunds
  4. Dredge campaign(s)
  5. Excavation of mudflats (where required)
  6. Installation of Controlled Modulus Columns (CMCs) in the reclaimed area
  7. Installation of gravel pavement and drainage system

At the commencement of the construction phase, fill materials would be brought to the OTRA site via trucks for surcharging purposes (the total volume of this material is dependent on the final levels required due to drainage and finished levels).

Surcharge material would be spread across the site and left in place for up to 12 months to ensure consolidation of the existing site.

Dredging

Dredging is required to ensure there is sufficient water depth for safe navigation.

Over time, sediment such as sand, silt and debris can accumulate in these areas, making the water too shallow for large ships to enter and dock safely.

For the Victorian Renewable Energy Terminal, the approaching channel depth needs to be deepened to account for the draft of vessels transporting offshore wind components and to account for tidal changes.

Dredging is required at the following locations:

  • Adjacent to the quay (berth pocket) – This would allow for deepening of the berth pocket to allow vessels to moor at all states of tide. A layer of scour protection rock would be installed to prevent seabed disturbance caused by vessel propellers and bow and stern thrusters
  • Approach channel and turning basin – To widen and deepen these areas so that the vessels can pass safely. This would consist of localised dredging (in specific areas) to ensure that a navigable water depth is maintained within the channel.  

There are two quay wall options under consideration which require different dredging programs. For both options, the dredging methodology would remain the same.

Image: A backhoe dredge vessel placing dredged material into a hopper barge.