GasClam® - the original continuous monitoring instrument

GasClam® is designed to fit inside a standard ground-gas monitoring well and continuously monitor both ground-gases and environmental parameters that influence those gases.

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GasClam® is designed to fit inside a standard ground-gas monitoring well and continuously monitor both ground-gases and environmental parameters that influence those gases.

Get in touch
GasClam® Development

Simon Talbot, the founder and managing director of GGS, was previously the Director of the GMGU; a local authority technical support unit based at the University of Manchester. In this role Simon carried out teaching, training and research activities on contaminated land issues with a particular focus on the monitoring and risk assessment of ground-gas contamination. In 2002 the GMGU was running a series of ground-gas training events for local authority regulators and Simon invited Dr Stephen Boult from the University of Manchester as a guest lecturer to discuss gas sensor technology.

Steve’s research interests in environmental systems and high frequency monitoring and Simon’s interest in ground-gas led to discussions on the limitations of conventional ground-gas monitoring and the start of collaboration in developing continuous ground-gas monitoring techniques. Steve, through his university technology transfer spin-off company, Salamander, developed prototype field equipment that was trialled and tested by Simon’s team on a range of sites. Initially, the equipment comprised sensors installed in a standard monitoring well linked to a data logger located in an adjacent weather-proof box. Although the equipment was bulky and cumbersome to use, the quality of the data was such that Salamander, with additional advice from Simon on practical aspects, embarked on a design project over the next four years to develop the equipment to fit inside a standard borehole and the prototype GasClam® was created.


In 2006 Steve and Simon put together a consortium bid for DTI Technology Programme funding for a project to devise and validate an improved risk prediction methodology using the GasClam®. Dr. Peter Morris was appointed as the post-doctoral researcher for the two year project. In 2007, Salamander won the Innovative Technology (Environmental Technologies) prize at the Northwest Business Environment Awards. The success of the DTI project resulted in GasClam® being brought to market and the establishment of Ground-Gas Solutions Ltd.


Why Regulators like it


Conventional ground-gas monitoring data is at best a tabulated collection of snap-shots in time. As such it is susceptible to huge degrees of error with the worst case either not captured at all or poorly characterised. To compensate for this regulators will usually require extended periods of ‘spot monitoring’ and highly conservative protection measures that are based on generic risk assessment tools and standardised characteristic situations.

In comparison, continuous ground-gas data provides the full range of ground-gas behaviours for a given monitoring period. Nothing is hidden and the worst case situation is clearly identified.

The GGS DataPack™ reproduces all the continuous data in a visually accessible format that clearly and unambiguously identifies the gas regime and the factors affecting it. For the regulator who is used to receiving lengthy contaminated land reports with all the detail buried in tens of pages of small print tables, the graphical presentation in the GGS DataPack™ is a breath of fresh air.

Consequently, in a few moments, the regulator can grasp the key issues, be convinced by compelling lines of evidence and accept the recommendations.

Regulators GasClam


GasClam®, buy or hire?


GasClam® is a beautifully designed piece of equipment. It is designed to fit inside a standard ground-gas monitoring well and continuously monitor both the ground-gases and the environmental parameters that influence those gases. However, it is the GasClam® data and the confidence that can be placed on its interpretation that is valuable.

Ground-gas monitoring contracts usually include three or more boreholes. If you wish to buy GasClam® you will require at least three units to be able to provide a comprehensive service that will satisfy regulators. If the money is not available for that scale of capital investment, the hire option may appear attractive. However, by hiring the equipment you will be liable for the replacement costs if the equipment is damaged or stolen. In addition, you will be responsible for the necessary servicing, to replace batteries, water-stripping filters and seals. Depending on the site conditions, gas moisture and ambient temperature, this may be needed as frequently as every two weeks. The servicing involves removing the top and lower sections of the instrument and this should be carried out by suitably trained staff to ensure ‘O’ rings are not damaged and connections are gas tight.

Using Ground-Gas Solutions Ltd gives you the following benefits:

  • GGS has the largest fleet of GasClam®s in the UK. It can rapidly deploy multiple units to a site at cost effective rates.
  • GGS’s equipment is insured while on client’s sites. This means that there are no hidden costs or liabilities.
  • By specialising in continuous ground-gas monitoring and risk assessment, GGS has developed the GGS DataPack™, the industry standard in factual continuous ground-gas data presentation. This unique report format provides regulators and consultancies with all the data in a clear and concise form that removes ambiguity and enhances understanding of the ground-gas processes and risks associated with a particular site.
  • GGS’ staff have over 8 years experience in continuous monitoring and understand the most cost effective deployment patterns, such as zoning or  transects to provide the information you need.
  • As experienced consultants, backed by full professional indemnity insurance, GGS will de-risk complex ground-gas investigation and risk assessments and, where required, provide appropriate remedial designs you can have confidence in.


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The following pages include news articles, videos, guidance notes and white papers on a range of ground gas related topics which we hope you will find of interest. Please browse through but if you can’t find something on your particular issue of interest, we’d be very pleased to hear from you so we can put that right.