Belmont Community Zone
Between July and November 2017, 68 diaphragm walls reaching 20m below ground were built to form the vertical walls of the underground structure. The walls of the underground station are now complete and the six month dewatering program is scheduled to start in February 2018.
Dewatering involves temporary and localised lowering of the groundwater level, by pumping from purpose built bores, to allow deep excavations to occur without the work site refilling with water. This process will be undertaken at the Belmont Station site to enable construction of the underground structure which forms the station. To find out more, view the Belmont Station dewatering fact sheet.
Through routine environmental investigations for the construction of Belmont Station, the Public Transport Authority (PTA) has discovered perfluoroalkyl and polyfluoroalkyl substances (PFAS) in the groundwater. PFAS are manufactured compounds that have been used in certain types of firefighting foams and a range of consumer products, including non-stick cookware, fabric treatments, furniture and carpet stain protection, and food packaging since the 1950s. Environmental contamination by PFAS is an emerging challenge worldwide, and in WA is starting to be reported at various sites.
The WA Department of Health (DoH) has advised that the PFAS levels found within the Belmont Station construction site and its immediate surrounds do not pose a health risk to members of the public.
PTA has reported the results from the project’s environmental testing to the Department of Water and Environmental Regulation (DWER), the state regulatory agency. The presence of PFAS at the site has not been caused by the Forrestfield-Airport Link project and during the dewatering process, a strict management and monitoring regime will be in place to ensure PFAS is not spread.
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