Mardi, New South Wales


Central Coast Council



  • Pipelines


2019 – 2021

Contract value

$25 – 50 million 


Mardi to Warnervale Pipeline

Fast facts

1,320 m

Horizontal Directional Drilling (HDD)

8.9 km

750mm HDPE pipe

160 m

thrust boring crossing


Central Coast Council awarded the Mardi to Warnervale pipeline project to joint venture (JV) partners Spiecapag Australia and Seymour Whyte (VINCI specialist infrastructure and engineering companies in Australia).

The project involves the construction of 8.9 km of a nominal 750 mm diameter pipeline from the Mardi Water Treatment Plant to Sparks Road in Warnervale. The route crosses road reserves, council land, private land and sensitive environmental areas; and therefore trenchless technologies will be used for five critical crossings:

  • Trenching under the Newcastle oil and gas mains at two locations
  • Horizontal Directional Drilling (HDD) crossing (720 m) of Wyong River and Porters Creek
  • Horizontal Directional Drilling (HDD) crossing (600 m) of Coastal State Environment Planning Policy (SEPP) wetland
  • Thrust boring crossing (60 m) of Deep Creek
  • Thrust boring crossing (100 m) under the M1 Motorway

Further scope includes clearing and grubbing, access track construction, embankment earthworks, valve house construction, valve station construction, treatment of acid sulphate soils, fencing, rehabilitation works and pipe welding, testing and commissioning.

“It’s a great opportunity to demonstrate how the capability and strength of the VINCI Construction group can deliver value for local communities. We look forward to building a collaborative approach with the Central Coast Council.”

John Walsh, Managing Director, Spiecapag 

Project gallery

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