Construction

Rosehill Recycled Water Scheme

Construction of the Rosehill Recycled Water Scheme commenced in June 2009 at the Fairfield plant site (Corner of North St and East Pde, Fairfield) with remediation of the site and to relocate of an existing stormwater and sewer main. Construction of the water recycling plant commenced in November 2009 with the recycled water main network and reservoirs commenced in January 2010.

A number of construction techniques were utilised including

• open trenching
• pipe bursting
• horizontal directional drilling
• case boring

The recycled water main was primarily installed in roadways and parks

Trenches for the main were dug using an excavator. After the installation of the pipe, the trench was back filled and the surface restored in accordance with council and RTA guidelines.

Along Woodville Road the recycled water main was constructed by the pipe bursting method. This method consists of pulling a new pipeline through an existing gas pipeline. The existing pipe is burst open and the new pipe is pulled through. This involves digging small pits at intervals along the road to access the isolated gas main. Pipe bursting removes the need to dig long open trenches and minimises disturbance to the road surface. Pipe bursting reduces traffic delays associated with construction works and reduces the amount of materials to restore the road.

To cross under rivers and creeks Jemena used horizontal directional drilling so that the main was constructed without disturbing the watercourse.

Horizontal directional drilling was used to cross under

• Prospect Creek at Fairfield Park
• Duck River between Deniehy Street and Shirley Street Granville
• Duck Creek at Elizabeth St Granville

Case boring was used to install mains crossing smaller water courses, existing services, rail crossings and some major roads including Parramatta Road Granville.