Answers to common questions about Walleys Quarry

How is landfill gas managed at the site?

Gas is generated when plants, food and other living waste starts to decompose in a landfill. The composition and production of landfill gas varies according to the type and age of the waste.  

The principal components are carbon dioxide and methane, which are odourless, however, other gases present at low concentrations such as hydrogen sulphide are odorous.  

The permit requires the operator to monitor both the composition of landfill gas being produced and to monitor boreholes around the perimeter of the landfill to ensure gas is not escaping.  

Gas is collected from a series of wells and used to fuel a gas engine. The facility has a high temperature flare which is operated if the engines are not available - for example during servicing.