Wheatstone Project

Mobile Dewatering

Project Owner: Chevron Australia

Contractor: Laing O’Rourke

Project Value: $500m

The Mobile Dewatering Group was contracted by Laing O’Rourke to complete dewatering and water treatment to allow for the construction of two liquefied natural gas (LNG) train facilities. 

Environmental requirements on this project were very specific, requiring an environmental presence onsite at all times due to fluctuating extracted water results.

The dewatering system installed consisted of deep sump and shallow spear systems. Extracted water was pH treated through a chemical dosing unit prior to being discharged to an infiltration pond located 1.5 kilometres away from the initial extraction points. 

Combating water quality issues, two 60,000 litre water storage tanks were utilised on site which provided four hours of additional storage capacity. This system design change provided  the time needed for the dosing chemicals to react and for the sediment produced from the dewatering effluent to settle. 

Aeration tanks, standby pumps, booster pumps and alarm systems all formed part of the dewatering design and  were manned by our water treatment technicians around the clock.

The stringent environmental and safety requirements were successfully adhered to allowing uninhibited progress for this multi-billion dollar LNG infrastructure project