Continuous Ground-Gas Monitoring

GGS applies continuous ground gas monitoring technologies to monitor former landfill sites, enabling accurate identification and quantification of the ground-gas hazards. GGS staff is trained in the use of GasClam® to monitor ground-gas concentrations at the frequency of change of the variable parameters that influence ground-gas generation and migration. By adjusting the frequency of monitoring in this way GGS are able to obtain continuous data sets of the changing gas regime. By carrying out continuous monitoring the true ground-gas regime can be identified, as well as identification of ground-gas driving mechanisms on site. GGS is experienced in understanding, analysing and interpreting high density ground-gas data sets. Improved knowledge of the ground-gas regime allows improved risk prediction, meaning remedial design solutions can be targeted more appropriately.

GGS uses additional tools to quantify the ground-gas risk from former landfill, including the GGS Purge & Recovery Test and GGS Concentration Duration Analysis.

 

GGS GasClam®s can be set to continuously monitor the following gas concentrations and environmental parameters:

EC5Q7455

  • Methane
  • Carbon dioxide
  • Oxygen
  • Carbon monoxide
  • Hydrogen sulphide
  • Total Volatile Organic Compounds
  • Atmospheric Pressure
  • Borehole Pressure
  • Temperature
  • Standing Water Level

 

Brownfield Development

Redevelopment of brownfield land is becoming increasingly common, providing a sustainable solution to the need for more residential housing and infrastructure. Due to the nature of brownfield land, ground-gas contamination may pose a risk to future developments. By using GasClam® instrumentation, GGS continuously monitors ground-gas concentrations and environmental parameters. Collection of high quality data over short periods allows shortening of prescribed monitoring periods. By understanding the actual ground-gas regime and identifying ground-gas drivers, GGS can target remedial measures appropriately, avoiding over-design and unnecessary mitigation costs.

The reduced uncertainty and increased confidence associated with GGS’s techniques are becoming increasingly requested by regulators throughout the UK.

GGS provides the following services to aid in brownfield redevelopment:

  • Efficient assimilation of existing site information through effective client liaison.
  • Authoritative historical research (Preliminary Risk Assessment) including walk-over survey and conceptual model.
  • Detailed monitoring plan for existing boreholes.
  • Detailed monitoring plan and installation of new or additional boreholes.
  • Presentation of factual data.
  • Enhanced data analysis including production of concentration duration curves, borehole recovery profile and hysteresis analysis.
  • Risk assessment for specified receptors.
  • Remedial design, contract management, completion monitoring and validation.

Part 2A

GGS has a unique understanding of the historical industrial legacy and landfill activities coupled with up to date knowledge of regulatory controls. This enables GGS to develop cost effective monitoring programmes tailored to the specific pollutant linkages present on a site.

Using GasClam® for continuous, in-borehole ground-gas monitoring GGS reduce uncertainty and provide correlations with environmental factors to identify drivers of the ground-gas regime. This leads to the development of high quality conceptual models and improved risk assessment.

GGS offers the following specific services to aid in Part 2A investigation:

  • Efficient assimilation of existing site information through effective client liaison.
  • Authoritative historical research (Preliminary Risk Assessment) including walk-over survey
  • Detailed monitoring plan of existing boreholes
  • Detailed monitoring plan and installation of new or additional boreholes.
  • Presentation of factual data
  • Enhanced data analysis including production of concentration duration curves, borehole recovery profile and hysteresis analysis
  • Risk assessment for specified receptors
  • Accurately targeted remedial design

Take a look at our gas monitoring data and service packages here.

Read about the real benefits Continuous Monitoring data here.