Rising Main and GWTP Upgrade

Location: Toowong, Queensland

Sector: Water

Client: GHD

Asset Owner: Confidential

Service: Development

Value: Confidential

Scope

The project scope included installing a new 354m long OD140 PE100 SDR11 rising main across an old land fill, busy main road. 108m of a new DN140 PE100 PN16 gravity sewer main. Tie into existing discharge pipeline, tie into existing manhole and construction of new inspection chambers. New pump station retrofitted adjacent to the existing GWTP and tie into existing plant.  

+ Infravisory’s Role

As the Quantity Surveying and Estimating consultant, Infravisory provided GHD with a Class 1 pre-tender estimate, including developing a detailed:

  • Bill of Quantities for inclusion in   the tender documentation

  • Construction program

  • Constructability review

  • Risk analysis.

  • First Principle Estimate.

  • Basis of Estimate Report.

+ Challenges

The project presented a number of key challenges, particularly those associated with tying into an existing discharge pipeline and working within an existing Water Treatment Plant, whilst remaining operational. As a result, it was imperative that the works were sequenced in a way that minimizes disruption to the plant.

+ Value Add

Infravisory took the time to understand the project’s complexities and associated constructability challenges, resulting in the team exceeding client expectations and developing an accurate pre-tender estimate that supports the project objectives.

To achieve this, the team worked closely with the market to source quotes for key scope items and provided Seqwater with accurate lead time durations enabling the identification of critical scope items requiring early procurement.

Infravisory also developed a construction program based on a detailed constructability review and considerations to ensure the allocated timeframe could be achieved.

Andy was able to navigate a complex brownfield project with many organizational interfaces. He adapted quickly to an unfamiliar client and was able to provide sound advice and alternate solutions when problems arose. Andy’s flexible approach was key to the successful outcome of this project.

Ben Armstrong

Senior Water Engineer - Water Process and Systems, GHD