Cootamundra SPS Rising Main Replacement

Trazlbat delivered the construction, testing, commissioning, and handover of approximately 2.37 kilometres of DN450 PE100 PN16 sewer rising main. The works were completed using a combination of open trench installation and trenchless construction methods to navigate road crossings, constrained corridors, and sensitive service areas, forming a critical upgrade to the local sewerage network.

The project included live connections to existing sewer infrastructure, installation of key control and monitoring assets, and full integration into the existing wastewater system. Works were carried out in accordance with relevant standards and in close coordination with stakeholders to ensure safe and reliable commissioning.

Scope of Works

• Construction of approximately 2.37 km of DN450 PE100 PN16 sewer rising main.
• Open trench installation of HDPE rising main in road reserve and non-trafficable areas.
• Trenchless underboring beneath major road crossings and constrained sections.
• Installation of air valves, scour valves, tees, thrust restraints, and concrete anchor blocks.
• Construction of a new flow meter pit.
• Live connection works at:
  • Betts Street Sewer Pump Station (SPS)
  • Cootamundra Sewage Treatment Plant inlet works
• Hydrostatic pressure testing, compaction testing, and full system commissioning.
• Preparation of Work-As-Executed (WAE) drawings and post-construction survey.
• Site reinstatement of all disturbed areas following completion of works.

Project Challenges

• Managing live cut-over connections to existing sewer infrastructure while maintaining system continuity.
• Working in close proximity to a Transport for NSW main road and coordinating traffic management requirements.
• Executing trenchless installations in constrained and high-risk crossing locations.
• Maintaining safe construction practices during live wastewater network tie-ins.
• Coordinating works around operational sewer assets and ensuring uninterrupted service to customers.
• Managing geotechnical and alignment constraints across both trench and trenchless sections