Lednez Project
DTD Treatment Complete
The treatment of dioxin-contaminated soil and sediment from the former Lednez/Union Carbide site and Homebush Bay was completed in May 2010. A process known as directly-heated thermal desorption (DTD) was used to treat more than 80,000 tonnes of material. The DTD plant and associated infrastructure was moved to another remediation project in Botany a few weeks after treatment finished.
The backfilling of hundreds of thousands of tonnes of treated and untreated material will be ongoing until the end of 2010, when the Lednez Project is scheduled to conclude. The untreated soil and sediment contains low levels of dioxin and meets the land’s "reuse criteria" without requiring DTD treatment. It is being placed at depth on the site.
Thiess Services is implementing "best practice" odour controls throughout its backfilling works to minimise odorous impacts in the community as much as possible. Some soil and sediment that is being placed at depth contains volatile organic compounds which can create odour when the material is moved.
Allied Feeds Project
Completion Goal Achieved
The Allied Feeds project reached its treatment completion goal in July 2009. More than 185,000 tonnes of contaminated soil was thermally treated to reduce its dioxin level to less than one part per billion (1 ppb).
Thiess Services has dismantled the DTD plant that was used to treat the soil. The reinstatement of the site to the final ground levels required for its ongoing development was completed in August 2009.