The Victorian Government is sort of trapped in between the contractual dispute mess between Transurban and Spanish & Chinese contractors over who would pay for the disposal of the contaminated soil from the West Gate tunnel.

At least to be able to prevent the similar future problems, The Victorian Government has come up with new new regulations for the management and disposal of tunnel boring machine (TBM) spoil to protect human health and the environment.

The new regulations released by Environmental Protection Authority Victoria (EPA Victoria) says:

The occupier of a site wishing to receive TBM must:

• construct an appropriate containment and management system
• manage the spoil appropriately so that its risks are controlled, including leachate capture and dust control

demonstrate how soil, groundwater, surface water and air quality will be protected.

The new regulations will be in effect as of July 1, 2021.

https://www.epa.vic.gov.au/about-epa/laws