Adelaide, South Australia
McMahon Services Australia
The Australian Bragg Centre (formerly SAHMRI2) Proton Therapy Unit (PTU) Development was a high-profile development project that involved remediation of a former train control centre on North Terrace, Adelaide, South Australia. There were a number of novel and unique approaches used by Ennovo to enable project success and reduce many of the inherent technical and financial risks associated with the project.
The site is an area of long standing historical contamination in close proximity to the Torrens River and surrounded by established commercial buildings. There were around 27 stakeholders involved in the project with a very high level of scrutiny.
The project was undertaken in two distinct stages, 1) investigation and assessment and 2) remediation. The investigation phase used a number of novel approaches that enabled the remediation contractor to provide a fixed lump sum for the remediation of the site, as well as to provide Interim Audit Advice from the site Auditor. This was critical in relation to providing financial certainty for the project.
Ennovo used an Optical Interface Probe (OIP) and Membrane Interface Hydraulic Profiling (MiHPT) probe to provide rapid and extensive semi quantitative data to then inform the targeted standard assessment process. This data was then collated to generate a 3D model of the main contaminant plume present on the site. This allowed a relatively high level of certainty for the contractor to provide a remediation cost estimate, as well as providing the Auditor with a clear understanding of the extent of contamination on the site.
Such was the success of the investigation process the project proceeded to full development, starting with remediation of the site. Ennovo assumed a remediation supervision and environmental validation and overview role during all site works. In addition, Ennovo developed a treatment process for the contaminated soil using an enhanced bioremediation treatment process, utilising a novel reagent Bio 3642 after extensive laboratory-scale development.
The main disciplines undertaken included the following:
- Drilling works and monitoring well installation
- Optical Interface Probe (OIP) investigation
- Membrane Interface Hydraulic Profiling (MiHPT) probe investigation
- Soil, groundwater and vapour field investigations
- Development of a 3D contaminant plume model
- Compilation of a PSI, DSI, CSM, SRP and CEMP
- Human Health Risk Assessment (HRRA)
- Odour modelling and odour enclosure design input
- Contaminant Fate and Transport Modelling
- Soil Vapour Barrier System Concept Design
- Laboratory-scale treatment trial of contaminated soils
- On-site supervision during remediation works including odour and environmental parameter monitoring
- Full-scale contaminated soil treatment using an enhanced bioremediation process and reagent Bio 3642
- Site Remediation Validation Report
The site has a number of unique aspects that presented both technical and financial challenges. Through the use of continuous monitoring equipment, a robust LFG risk assessment was achieved which in turn informed the design basis of the gas mitigation system.
The main disciplines undertaken included the following:
- Continuous and spot gas monitoring
- Surface gas emission assessment
- Services investigation and field investigations
- Drilling works and monitoring well installation
- Development of a Conceptual Site Model (CSM)
- Landfill Gas (LFG) Risk Assessment
- Odour modelling
- Design of a LFG mitigation system
