Talis was contracted by the City of Bayswater to deliver a detailed site investigation for the Gibbney Sporting Reserve situated in Maylands, Perth.
Numerous historical landfill sites are situated close to the Swan River, generally within areas formerly utilised for extractive industries and market gardens. Gibbney Reserve is located on a former landfill which accepted demolition and putrescible waste until the early 1960s. Following the Reserve’s closure, both capping material and turf were placed over the waste mass. To ensure the continuing suitability of the reserve for public use, the City conducted a preliminary site investigation (PSI/Phase I) which highlighted a potential risk to site users and the surrounding environment and recommended further, more detailed, investigations. The City then engaged Talis Consultants to undertake a detailed site investigation (DSI/Phase II), targeting potential risks associated with the shallow soil capping, impacts to groundwater & the possible generation of landfill gas.
As part of our work, our team conducted the following range of investigations:
- Initial desktop review;
- Liaison with the Department of Water and Environment Regulation (DWER);
- Intrusive soil investigation;
- Groundwater and landfill gas well installation;
- Groundwater and landfill gas monitoring;
- Landfill gas ‘spike probing’;
- Creation of conceptual site model and detailed risk assessment; and
- Detailed contaminated site report.
Talis conducted all investigations in accordance with the DWER Assessment and Management of Contaminated Sites- Guidelines (2014), and the National Environmental Protection (Assessment of Site Contamination) Measures 1999 (Amended 2013). The assessment of landfill gas was undertaken per CIRIA C665 (Assessment of Risks Posed by Hazardous Ground Gases to Buildings).
Through our work and detailed risk assessment, Talis was able to establish a low risk to potential site users and the surrounding environment while proving the generation of landfill gas had ceased and that the site was ultimately suitable for its current use.