RPS undertook a Detailed Site Investigation (DSI) to evaluate contamination at HMAS Stirling, with initial phases of work including:
- A data gap analysis
- A Sampling and Analysis Quality Plan (SAQP)
- Detailed Site Investigation (DSI)
- Six-month groundwater monitoring program
- Preliminary Human Health and Ecological Risk Assessment
- Community consultation and subcontractor management in line with relevant legislative and policy compliance requirements.
Subsequent phases of work involved delivery of a contaminant fate and transport model and the completion of a Tier 2 Ecological Risk Assessment (ERA) including biota sampling, to determine risks to Garden Island’s ecology and the surrounding marine environment.
To meet tight timeframes for delivery, RPS employed multiple drilling and sample collection teams to operate across the Island concurrently. This reduced the amount of time required for each mobilisation and helped the project to remain on schedule.
Through detailed risk assessment and informed by the latest emerging contaminant science, our team was able to confirm that the use of PFAS on the Island had resulted in a very limited impact, presenting no risk to human health and very limited risk to local ecological communities.
Understanding that emerging contamination issues are of concern to communities but aren’t always well understood, our environmental and communication teams worked together with Defence to ensure complex investigation data could be presented to stakeholders in an accessible, easy-to-understand manner through presentations, walk-in events and one-on-one Q&A sessions.