Bondi Ocean Outfall Sewer

The Bondi Ocean Outfall Sewer (BOOS) is over 900 metres in length and constructed in a rock tunnel and wet sand trench. It has deteriorated from a combination of normal aging, infiltration and sulphuric acid attack.

The outfall sewer has an oviform geometry with heights exceeding 2.5 metres in certain sections. The rehabilitation work will need to be carried out in – live flow conditions. Water Infrastructure Group will use its proprietary Panel Lok system with previously developed techniques to rehabilitate Sydney’s Western Branch Main Sewer and trial the application of Calcium Aluminate Cement for a 300 metre section of the work.

Northern Suburbs Ocean Outfall Sewer

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The Northern Suburbs Ocean Outfall Sewer (NSOOS) aqueducts, Gore Creek and Burns Bay, have a combined length of 245 metres. The aqueducts are constructed from concrete that has suffered significant internal deterioration from hydrogen sulphide gas. Water Infrastructure Group will use shotcrete applications and an epoxy coating to preserve the remaining concrete. The project also involves the construction of new access openings for the aqueducts and protective coating repairs to existing manholes and inlets.

Once again, work in the aqueducts will be conducted in live-flow conditions and will need to be carefully managed to minimise impacts on nearby residents recreational facilities.

An experienced team

Water Infrastructure Group will use its award-winning rehabilitation techniques and community liaison processes developed during the rehabilitation of Sydney’s Southern and Western Suburbs Ocean Outfall Sewer to complete these important projects.