Project: Landfill Rehabilitation
Site: Former Sand Quarry
Location: New South Wales
Year Completed: 2017
Landfill Gas Risk Assessment, Landfill Gas Mitigation Design
EPG was engaged to undertake a detailed quantitative landfill gas risk assessment for a large master-planned residential precinct. The land proposed for redevelopment was formerly quarried for sand until the mid- 1980s before being backfilled with demolition and construction waste.
As the risk assessor, EPG worked with the site investigation consultant and Auditor to develop advanced landfill gas investigation techniques (seldom used in this field) to increase data confidence and ultimately meet the client’s objective; increase land value and avoidance of expensive landfill gas mitigation requirements (where justifiable).
A comprehensive and robust assessment of the data and information was completed in accordance with NSW EPA and international guidelines. A tiered approach to the assessment was followed whereby initial screening was followed by a complete detailed quantitative risk assessment, including site-specific modelling of gas flow from the ground under various influences such as tidal variations in groundwater levels.