The award was for the technically challenging structural rehabilitation and lining of two heritage-listed aqueducts at Burns Bay Oval, Riverview and Gore Creek Reserve, Greenwich in Sydney.

The aqueducts are part of the Northern Suburbs Ocean Outfall Sewer (NSOOS), which is the largest wastewater system in Sydney, serving 25 per cent of the city’s population. Parts of the system are heritage-listed, including the Burns Bay and Gore Creek aqueducts. NSOOS is one of the oldest sewer interceptors in Australia, constructed between 1920 and 1930.

The $A4.5 million construct contract for SewerFix Wet Weather Alliance involved working in live sewage flow on a heritage-listed structure in a high-density residential area. This critical rehabilitation project has restored the structural integrity and hydraulic capacity of these two NSOOS aqueducts. This was achieved by reinstating the internal reinforced concrete surface to its original design profile and lining it with a corrosion-resistant epoxy lining.

Several innovative solutions were implemented during the NSOOS project, including custom platforms designed to provide safe surfaces conditions in live flow and a two-part epoxy mortar coating system that WIG has refined to be an extremely efficient, reliable and safe option for sewer rehabilitation. The productivity levels on this project had not previously been achieved in Australia.

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In their 17th year, the Earth Awards are very prestigious awards in civil infrastructure. The awards are presented for outstanding work in construction and environmental excellence that reflects development and use of the best technologies and practices by Australian civil contractors.