Redcliffe Community Zone

Works update

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:

August September October November
  • Pour 1 - Thursday 16 (complete) 
  • Pour 2 - Friday 31 (complete)
  • Pour 3 - Thursday 13 (complete)
  • Pour 4 - Friday 28 (complete)
  • Pour 5 - Tuesday 2
  • Pour 6 - Thursday 11
  • Pour 7 - Monday 22
  • Pour 8 - Thursday 1
  • Pour 9 -  Monday 12

 

 

 

 

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

 What are PFAS?
Perfluoroalkyl and polyfluoroalkyl substances (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.

There are more than 3000 types of PFAS. The best known compounds are perfluorooctane sulfonate (PFOS), perfluorooctanoic acid (PFOA) and perfluorohexane sulfonate (PFHxS).
 Do PFAS have adverse health effects?
The Western Australian Department of Health has advised the PTA that the PFAS levels found within the Redcliffe Station construction site and its immediate surrounds do not pose a health risk to members of the public.

According to the Australian Government Department of Health, there is currently no consistent evidence that exposure to PFAS causes adverse human health effects. Fact sheets and further information on the affects of PFAS on human health are available on the Western Australian Department of Health website and the Australian Government Department of Health website.
 Why were environmental investigations carried out?
Environmental investigations commissioned by the PTA commenced in 2015 around the Forrestfield-Airport Link project area.  The investigations involved testing of soil, sediment, groundwater and surface water.

The objective of these environmental investigations was to understand the environmental quality of the soil and water which requires management during construction.

This information obtained has been used to identify appropriate construction methods and to ensure that suitable environmental management measures are implemented during construction.
 Is the PFAS detected in Redcliffe groundwater caused by the project?
The presence of PFAS has not been caused by the Forrestfield-Airport Link project. The PTA has not investigated the cause of the PFAS in the groundwater in Redcliffe as the objective of the environmental investigations was to understand the environmental quality of the soil and water which requires management during construction of the project.
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Redcliffe Community Group

Engagement with local businesses and residents remains a focus for the project team. To help ensure we remain aware of local issues, the project team has established community advisory groups for each of the project's community zones.

At these meetings, members are presented with design information and details of project progress, and asked to provide feedback, guidance and local knowledge during site establishment and early construction works; this is inclusive of the egress shaft construction works near the First St/Brearley Ave intersection.

Redcliffe Station

Redcliffe Station will be an underground station similar to Elizabeth Quay Station. The railway in this location will be fully underground, running inside the tunnel.

The station will benefit the community and surrounding catchment area by providing a bus/train interchange and car park with 500 bays, and allow for a 15-minute journey to the Perth CBD by rail. The station will also service future business and residential developments.

To find out more, view the Redcliffe Station fact sheet.

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View a map of how we expect the area surrounding the station to look post-construction.

The project team is working closely with local government to ensure the new station compliments their vision for the future of the local area. For more information about local planning visit the City of Belmont's website

 Where can I get more information?
For further information about PFAS investigation in WA, please visit DWER’s PFAS webpage or call the Contaminated Sites Information Line 1300 762 982.

For further health information please visit Healthy WA’s PFAS webpage or call DoH's Environmental Health Directorate on 08 9388 4999. Alternatively, the Australian Government Department of Health has established a PFAS webpage and hotline 1800 941 180.

 What is dewatering?

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 Redcliffe Station site to allow for the construction of the underground structure which forms the station. To find out more, view the Redcliffe Station dewatering fact sheet

 Where does the groundwater which is removed go?
The groundwater which is removed from inside the walls of Redcliffe Station will be pumped back into the ground immediately outside of the walls through a series of pipes and reinjection bores. The dewatering system has been designed to be what is referred to as a closed-loop system.

Six purpose built bores will be used to remove groundwater from within the station box. Groundwater will then be returned to the aquifer from which it was removed immediately outside of the station box. Eight bores will be installed to return the groundwater which will be removed during dewatering works back to the aquifer.
 What is the dewatering footprint?
Localised reinjection of water within the closed-loop system at Redcliffe Station is anticipated to temporarily increase the groundwater level immediately outside of the station walls by approximately 50cm, and approximately 10cm at a distance of 300m from the construction site.
 Is the project treating the groundwater to remove PFAS?
There is no requirement to treat the groundwater to remove PFAS provided it is reinjected back into the ground in the same area it was removed from. This approach is consistent with DWER’s interim guideline on the assessment and management of PFAS and has been endorsed by the project’s accredited Contaminated Sites Auditor.
 Will my groundwater bore be affected by dewatering for Redcliffe Station?
The closed-loop system limits groundwater level changes outside of the station box, as well as the potential for adverse environmental impacts and movement of neighbouring structures, by limiting the extent of dewatering to inside the walls.

As the dewatering is occurring during the summer and autumn months when groundwater levels are naturally at their lowest, adverse impacts resulting from dewatering activities are not anticipated.
 Will the groundwater be tested during construction?
Testing and monitoring of groundwater levels and quality from a network of sixteen monitoring wells is already underway. This will continue during dewatering and for a period of six months after the completion of dewatering. 

Monitoring wells are checked daily by our environmental specialists to ensure that the dewatering activities are not having a significant impact on the local groundwater table.

Water monitoring is undertaken to ensure there is no deterioration in water quality as a result of the dewatering activities and that the groundwater level is not altered to levels which have the potential to result in adverse impacts to surrounding infrastructure and the environment.

Groundwater levels are monitored against baseline (pre-construction) conditions, and flow meters are fitted to dewatering bores to ensure that the volume of groundwater which is abstracted is in accordance with our licence limits.
 Will the PTA test my bore for PFAS?
The PTA will not conduct testing on private water bores. During dewatering, groundwater will be managed within a closed-loop dewatering system, which minimises the potential for adverse environmental impacts and movement of any contaminants present in groundwater. This will see groundwater removed from within the walls of the underground station and pumped back into the same aquifer immediately outside of the walls.


The network of 16 monitoring wells which will be monitored prior to, during and following the completion of dewatering activities is adequate to assess potential impacts to surrounding infrastructure or the environment which may occur as a result of the dewatering activities.


Information about testing your private bore can be found on DWER's contaminated sites fact sheet

Mid-2018

when the TBMs arrive at Redcliffe Station

500

The number of parking bays at Redcliffe Station

15 minutes

The rail journey from Redcliffe Station to the CBD

10 minute

service during peak operations

4,100

daily trips from Redcliffe Station by 2021

1-zone

fare to the CBD

6

the number of bus bays at Redcliffe Station