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House of Assembly - Fifty-Fifth Parliament, First Session (55-1)
2025-06-05 Daily Xml
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Parliamentary Committees

Public Works Committee: Port Adelaide Grand Trunkway Rising Main Replacement

Ms HOOD (Adelaide) (11:56): I move:

That the 139th report of the committee, entitled Port Adelaide Grand Trunkway Rising Main Replacement, be noted.

The existing Port Adelaide Grand Trunkway rising main was constructed in 1975 and allows wastewater to be pumped from an industrial precinct into SA Water's wastewater network. It is a four-kilometre asbestos cement pipeline that begins at a pump station near the Cargill malt plant located between Ocean Steamers Road and Grand Trunkway in Port Adelaide. Wastewater collected at this pump station is transferred to the main sewer system in Wingfield via the pipeline in question, which over time has deteriorated, resulting in five breaks in the last four years, leading to uncontrolled wastewater discharges.

SA Water, hereon referred to as 'the agency', has investigated several options to address the ageing pipeline, considering risks, technical elements and financial concerns. Options assessed included:

replacement of the full length of pipe without additional mitigations, which would leave it exposed to sudden operational pressure changes and gas build-up;

replacement of some sections of the pipe, as well as the installation of additional ancillary infrastructure, which would require further capital intervention in the future as the unreplaced sections of pipe would continue to degrade; or

replacement of the full length of pipe, as well as the installation of ancillary infrastructure, which would mitigate all risks and ensure the longest operating life without further future capital intervention.

Ultimately, SA Water decided that replacing the full length of pipe, with additional ancillary infrastructure, was the only feasible solution as it addresses all identified risks, improves and renews the pipeline's performance and prevents future gas build-up. The scope of works includes a new 4,000-metre sewer rising main, new infrastructure to minimise surge effects during operation, a new water seal to prevent gas build-up and a new manhole at the end of the pipeline.

The project is expected to cost approximately $6 million, and the agency states there will be no ongoing operational costs incurred by the works. Construction is anticipated to commence in the third quarter of this year, with the expectation to be practically complete in early 2027. The project is included within the delivery of SA Water's wastewater major framework program, and procurement has been conducted in accordance with SA Water's policy and procedures, conforming to all applicable Treasury and government policies.

The agency uses procurement frameworks to enable the sequential award of work, incentivising suppliers to perform well to ensure continuity of work, and states this delivers significant efficiency benefits through collaboration, innovation, consistency, planning and programming. In June last year, SA Water extended major framework partner agreements for the suite of its system-based programs. Option analysis and concept design was completed by SA Water engineering and the award of the design and construct package shall be in accordance with SA Water's delegation of financial and procurement authority and applicable Treasury and government policies.

The project is being managed in accordance with SA Water's corporate project management methodology by a project manager from the agency's capital planning and delivery group. The project manager is responsible for the development and delivery of the overall project, including seeking the necessary approvals and management of the selected contractor.

SA Water utilises a business management policy and framework to identify risks, determine related impacts and develop mitigation strategies, and the agency has identified potential delays arising from the pipeline's depth in some areas which may require more complex repairs. Design and construction risk evaluation will continue over the course of the project.

Debate adjourned.

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