Frequently asked questions
1. What steps were taken to minimise harm to the environment?
The project interacted with the Puhinui Stream in seven locations, and steps were taken to protect the stream from sediment and pollutants, as well as physical damage to the embankments of the stream.
Sediment is made up of the soil particles that are washed into the stream and can block light and suffocate fish and other aquatic life.
The project team installed 'fish baffles' to culverts, to slow down the stream current and keep that section of the stream habitable for fish.
The completed motorway landscaping features extensive planting of native plants and trees; including pohutakawa, flax and totara to create a green corridor.
2. What was done to reduce the impact of construction in the area?
The impacts of dust and noise were minimised throughout the project area. Dust was minimised by maintaining haul roads for trucks and using water trucks to dampen loose dust in open areas. The project team also regularly monitored dust, noise and vibration around the site.
3. What about Hayman Park?
Hayman Park is an important green space in central Manukau which is partially crossed by the State Highway 20 Manukau Extension and Manukau Station Road, as well as the new Manukau Railway Station. The station was constructed in collaboration with Manukau City Council and KiwiRail as part of the project.
4. What about the rail link into the city centre?
As part of the project, enabling work was completed for the Manukau Rail Link to connect Manukau city centre with the North Island Main Trunk Line. This work was completed on behalf of Manukau City Council. The contractor Leighton Works also constructed the structure for the new Manukau Railway Station.
