Talis has been working with the City of Bayswater to deliver a detailed site investigation for the Gibbney Reserve playing field situated in Maylands, WA.
Numerous historical landfills are situated in close proximity 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 sanity, demolition and putrescible waste until the in the early 1960’s. Following its closure, capping material and turf was 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 engaged Talis to undertake a detailed site investigation (DSI/Phase II) targeting potential risks associated with the shallow soil capping, impacts to groundwater and the potential generation of landfill gas.
In order to ascertain the desired outcome for the City, Talis conducted the following range of investigations:
- Initial desktop review;
- Liaison with the Department of Environment Regulation (DER);
- 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 DER 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 in accordance with CIRIA C665-Assessing 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.