Ocean Grove Sewer Rising Main Renewal

Renewal of critical sewer infrastructure through staged pipeline replacement and temporary bypass systems to maintain essential services across Barwon Heads.

Scope

Keystone Civil was engaged by Barwon Water to deliver the renewal of approximately 1.6 kilometres of the Ocean Grove Sewer Rising Main through Barwon Heads. The project involved replacing ageing sewer infrastructure while maintaining uninterrupted wastewater services to the surrounding community.

The works included the removal and replacement of approximately 500 metres of DN600 and 1,100 metres of DN675 glass-reinforced plastic (GRP) pipeline using a lift-and-relay construction methodology. To maintain sewer flows during construction, Keystone installed temporary above-ground HDPE bypass pipelines, including OD630 and OD800 mains and a secondary OD355 connection to the existing network.

Construction was divided into three main stages to manage the complexities of working within an established township and along heavily trafficked roads. Works included major sewer shutdowns, temporary bypass connections, trench excavation, pipe installation and reinstatement of road pavements and surrounding areas. Night works were undertaken along key sections of the alignment to reduce traffic congestion and minimise disruption to local residents and businesses.

The project also incorporated design reviews and adjustments to improve the long-term functionality and maintainability of the renewed infrastructure. Keystone worked closely with Barwon Water's operations team to coordinate shutdowns, manage changes to the construction program and ensure the safe delivery of works within a live sewer network.

Project Delivery

Delivery required detailed staging, careful traffic management and close coordination with Barwon Water, local residents and other stakeholders. Keystone adopted construction methodologies designed to reduce the duration of road closures and maintain access wherever practical, including targeted night works and accelerated programming. Environmental initiatives included recycling asphalt, concrete and HDPE offcuts, repurposing excavated sand and using approximately 1,000 tonnes of recycled crushed concrete for the site compound. Early design collaboration, supplier quality inspections and proactive community engagement supported the efficient delivery of this critical infrastructure renewal.

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