Holts Hill pH Dosing Improvement Project

Location: Mt Crosby, Queensland

Sector: Water

Client: GHD

Asset Owner: SEQ Water

Service: Development

Value: $12.8 million

Scope

The pH Improvement project included; installation of a new chemical delivery truck unloading area and spill containment facility, installation of new sodium hydroxide bulk storage tanks, installation of two sets of new duty / standby sodium hydroxide dosing pumps at Camerons Hill 1 & 2, duty and standby double-contained sodium hydroxide dosing lines from the Camerons Hill 1 & 2 dosing pumps to a new a dosing point, replacement of the redundant CH1 main free chlorine analyser with a free chlorine analyser with pH compensation and a new analyser at each Camerons Hill 1 & 2 sampling skids, removal of the existing anhydrous ammonia bullet

+ Infravisory’s Role

As the Quantity Surveying and Estimating consultant, Infravisory provided GHD with a Class 3 and Class 1 P80 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 conducting works within Holts Hill Water Treatment Plant whilst operational, which is a critical asset responsible for supplying clean drinking water to Ipswich and Brisbane. 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 time frame could be achieved.

Andy’s team was able to unpack a complex brownfield project and provide an efficient, well thought out and documented Class 1 estimate and schedule. He was able to effectively work with and communicate the overall project outcomes with both GHD and Seqwater. This was my first experience working with Andy, and I look forward to continuing this relationship on future projects.

Ben Armstrong

Senior Water Engineer - Water Process and Systems, GHD