Preliminary Site InvestigationFurther information on the investigation process can be found at the investigation process page.
The first stage of the investigation, the Preliminary Site Investigation (PSI), has been completed.
Detailed Site Investigation
The Detailed Site Investigation (DSI) has been completed. The DSI involved sampling of soil, sediment, surface water, groundwater, fish, crustaceans, fruit and vegetables. A detailed report has been published and is available on the publications page. Given the tropical climate of the Northern Territory, additional water, soil, plant and animal sampling and analysis will occur during the first quarter of 2018 to predict how PFAS moves in the environment throughout the seasons. The results will be reported in a Supplementary DSI Report to be released in mid-2018.
Human Health Risk Assessment & Ecological Risk Assessment
In response to the DSI findings, Defence commenced a Human Health Risk Assessment (HHRA) and Ecological Risk Assessment (ERA) to evaluate potential PFAS exposure pathways to people, plants and animals and inform potential actions to reduce PFAS exposure.
In January 2018 Defence published an Interim HHRA to provide the Katherine community with preliminary advice on potential exposure risks. In June 2018 Defence completed the final HHRA. The Interim and Final HHRA can be viewed on the publications page. The Ecological Risk Assessment is due to be published in mid 2018.