Land Gas Assessment

gas-monitoring2Land gas can arise from a variety of sources, both natural and man-made. Landfill sites are undoubtedly the commonest man-made sources of land gas.  Landfill gas is a complex mixture of gases that changes over time as the landfill ‘matures’.

Perhaps the most common sources of land gas are naturally occurring sources in organic soils such as peat, coal, and fluvial or marine alluvium.  These typically generate methane and carbon dioxide but other gases, such as hydrogen sulphide can also be present.

A site might be affected by land gas from sources that could be present on site or in the vicinity.

Land gases are hazardous to man and the environment due to their toxicity, asphyxiant properties or flammability.  There have been a number of high profile cases where the presence of land gas has resulted in human deaths, and the destruction of property by explosion. For this reason, we believe land gas monitoring & assessment to be an important part of our overall environmental consultancy services.

Due to the hazards presented by land gas, there is a need to investigate sites that could be affected, to assess the risks and, if necessary, put in place remedial or protection measures to manage the risk.

Monitoring Land Gas

We provide a full site investigation and ground assessment service, from initial desk study through to intrusive ground investigation, installation of monitoring wells, gas monitoring and testing, and risk assessment.

Our site investigation teams are experienced in gas risk assessment for new developments and existing buildings, cross-boundary migration monitoring, and surface emission surveys of former landfill sites.

Get in touch

If you have any questions about our services or would like to discuss how we could help you, please get in touch using our contact form below. Please provide as much information as possible about the nature of your enquiry, particularly the purpose of the investigation, the site address and postcode.

Any existing or proposed site plans are useful and can be attached beneath the message box. Please provide a contact address, email and telephone number. We will get in touch as soon as possible.


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Southern Testing are continuing to work through the Coronavirus (COVID-19) emergency, including carrying out site work where it is safe to do so.

The Government have given express support to the Construction sector and have issued specific guidance for working on site. The Construction Leadership Council have also issued guidance.

We have revised our travelling and working practices to ensure that our staff are protected, and to meet the particular requirements of the guidance as well as our own risk assessments. The guidance and our working practices are under constant review.

Most site investigation work can be undertaken safely under the current restrictions.

We are committed to helping all our clients, old and new, during this difficult time. Should you have any site investigation requirements, or wish to discuss a particular project, please do not hesitate to contact us.