The Williamtown Expert Panel, led by the NSW Chief Scientist and Engineer Professor Mary O’Kane AC, has made some changes to the Williamtown precautionary advice and the investigation area. This follows a review of the Defence’s final Human Health Risk Assessment (HHRA) report.
The NSW Environment Protection Authority has established a Management Area which comprises of three zones. The Management Area and Investigation Area do not overlap completely. The Management Area is smaller in some areas and larger in other areas including Fullerton Cove and additional streets in Salt Ash.
Further information on the expanded management area is available at the NSW EPA website.
Further information on blood testing, the epidemiological study and mental health and councelling services is available at the Department of Health website.
More information about the investigation stages is available on the investigation process page.
The PFAS Management Area Plan informs the activities Defence will undertake to manage, monitor and reduce potential risks of PFAS exposure on, and around, the Base.
This stage built on the findings of the 2016 Preliminary Ecological Risk Assessment. The report outlines PFAS exposure risks for plants and animals in the Investigation Area.
This stage built on previous Human Health Risk Assessments by using newly adopted Health Based Guidance Values from the Department of Health and considering new sampling and survey data.
This stage refined the 2016 Environmental Site Assessment by addressing data gaps and uncertainties regarding the extent of contamination in some areas. The assessment outlined the location of PFAS in the Investigation Area and how it is moving.
This addendum to the 2016 Human Health Risk Assessment considered a new Tolerable Daily Intake released by Food Standards Australia New Zealand for certain PFAS.
The purpose of the 2016 Preliminary Ecological Risk Assessment was to identify potential exposure-risks to plants and animals within the Investigation Area, for further assessment in a comprehensive Ecological Risk Assessment.
The purpose of the 2016 Human Health Risk Assessment was to evaluate potential exposure-risks to people, within the Investigation Area.
Similar to a Detailed Site Investigation, the 2016 Environmental Site Assessment involved sampling of soil, sediment, surface water and groundwater, to better understand how PFAS moves through the environment.
These stages involved a review of the historical use of firefighting foams on-base to identify potential sources of PFAS contamination.