CRL was engaged by Downer to deliver refurbishment works at two sewerage treatment plants in Wagga Wagga — Narrung STP and Kooringal STP. The project formed part of Downer’s contractual requirement to return both facilities to Wagga Wagga City Council with a minimum residual service life of 15+ years.

Structures Treated:

• Chlorine Contact Tanks (CCTs) and inlets (~12 years old)
• Narrung Clarifier (~40 years old)
• Filter Gallery (leaking joints)
• Aeration Tank (external cracking)

‍

Scope of Works:

• Crack and joint injection
• Concrete breakout and structural repair
• Joint sealing and repair
• Application of protective coatings

‍

Project Delivery:

• Confined Space Work:
  • Required continuous gas and oxygen monitoring.
  • Work stoppage occurred when CO2 spiked to 37%, triggering alarms and requiring evacuation.
• ‍External Conditions:
• Weather delays and power outages impacted scheduling.
• Strict adherence to safety and environmental controls ensured zero incidents

Project Delivery & Outcomes:

CRL delivered a complete structural repair and protective works package, including:

·       Crack Injection Works:

o   Sealed leaking cracks and joints in tanks and galleries.

o   Restored water-tightness and extended service life.

·       Concrete Breakout & Repair:

o   Removed and replaced deteriorated or cracked concrete in the Clarifier and Aeration Tank.

·       Joint Repair & Sealing:

o   Addressed joint leaks in the Filter Gallery and CCTs, restoring structural integrity.

·       Protective Coatings:

Applied to high-risk areas to provide long-term protection against environmental and chemical exposure.