Redcliffe Community Zone
With the completion of excavation and waterproofing works at Redcliffe Station, construction has begun on the station’s base slab. This involves installing steel reinforcement and pouring 5500 cubic metres of concrete.
Each of the nine pours required to construct the base slab takes around seven hours to complete. Concrete is continuously supplied by up to 14 concrete trucks. Each truck makes approximately eight trips over the course of the pour, delivering up to 650 cubic metres of concrete.
After an initial seven days of wet curing of each 1.5m deep section of the base slab, an additional 56 days are needed to complete the process.
The works that will occur over the next few months in association with concrete pouring are time-critical. For these and associated tasks, some out of hours works may be required as when a pour starts it must continue until finished. While every effort will be made to finish the pours by 7pm, there may be times when works must continue until 9pm.
All concrete pours are weather-dependent and as such the schedule for the pours is subject to change:
- Pour 1 - Thursday 16 (complete)
- Pour 2 - Friday 31 (complete)
- Pour 3 - Thursday 13 (complete)
- Pour 4 - Friday 28 (complete)
- Pour 5 - Tuesday 2 (complete)
- Pour 6 - Tuesday 23 (complete)
- Pour 7 - Friday 9 (complete)
- Pour 8 - Wednesday 21
- Pour 9 - Friday 30
The slab will then be prepared for the arrival of the tunnel boring machines (TBMs) later this summer. Works will include construction of columns and removal of temporary struts.
By the time the TBMs reach Redcliffe Station they will have constructed 1573 rings over 2517m since departing Airport Central Station.
Dewatering and environmental testing
Through routine environmental investigations for the construction of Redcliffe 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.
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 has been in place to ensure PFAS is not spread.
The six-month dewatering program began in February 2018, with the target level reached in March. Three of the six dewatering wells installed are currently in operation, with the water pumped into four reinjection bores outside the station box.
Water levels are closely monitored and have remained within 1m of the recorded groundwater levels for the area. Dewatering will be ongoing until late August.
To find out more, view the Redcliffe Station dewatering fact sheet.
Frequently Asked Questions