Inadequate gas migration controls found at many landfills

Many of the landfill gas control systems installed in the 1980s are not working effectively, according to a study for the Department of the Environment (DoE). Hazardous levels of methane were found to be migrating off-site from about half of the sites studied, often because operators had failed to observe DoE guidelines.

The study was carried out for the DoE by Environmental Resources Ltd (ERL). It was the first official attempt to assess the effectiveness of different gas control systems since a series of gas migration incidents in the mid-1980s prompted the DoE to issue a Waste Management Paper (WMP) on landfill gas in 1989.

The first part of the study was a questionnaire survey of landfill operators. ERL received little response from private sector ope

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