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Homebush Bay Remediation

Client: Thiess
Capabilities: Piling, Sheet Piling
Region: Sydney (New South Wales)
Completed: January 2010

The remediation of the disused Union Carbide and Allied feeds sites at Homebush Bay in Sydney involved the removal and treatment of dioxins and other hazardous contaminants from the factory site and in the adjacent waterway. The excavated material was treated using directly heated thermal desorption, a high temperature heating process which chemically converts the organic contaminants to carbon dioxide and water.

Waterway Constructions designed and constructed a 730 metres long sheet pile wall to allow excavation of the contaminated soils. The design of the wall was optimised by the incorporation of a rock bund to provide support to the wall in lieu of using a more expensive conventional anchor system. The construction methodology included for the progressive placement and removal of the bund as the remediation works proceeded.

The project provides an excellent example of Waterway Constructions' innovative and practical design approach. The wall was designed using sophisticated finite element modelling which enabled the geometry of the rock bund surcharge to be accurately determined and thereby limit movements during dewatering, excavation and other site operations. The sheet piles were driven through the contaminated soil layers and two metres into the sandstone bedrock. The Waterway Constructions design and construction methodology resulted in a 40% cost savings compared with more conventional construction techniques.

Waterway Constructions also installed steel tube piles for the silt curtains in the bay to prevent movement of the contamination during excavation in the water.

Homebush Bay Remediation
Homebush Bay Remediation

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