Consultants

Continuous ground gas monitoring & risk assessment, former landfill

GGS provided monitoring and consultancy services for this complex site with variable gas concentrations and flow

GGS provided monitoring and consultancy services for this complex site with variable gas concentrations and flow

Client
Consultant
Location
Berkshire
Date
2015
Project description

The site, part of a wider landfilled area, was under consideration for development by the landowner. During site investigation in 2015, significant concentrations of landfill gas and variable flow rates were recorded. Owing to the complex nature of the site and project timescales, GGS was approached by the client to provide a robust assessment of the gas regime, to accurately update the CSM and support the remediation strategy.

GGS provided support at an early stage to develop an appropriate proposal and monitoring programme. The following scope of works was agreed to build lines of evidence:

  • Continuous ground gas monitoring (including flow);
  • Continuous groundwater level monitoring;
  • Periodic ground gas monitoring;
  • Purge and recovery tests;
  • Water sampling for dissolved gas and vapours;
  • Surface walkover survey and flux box testing.

GGS specialists attended site to undertake all monitoring works, which were completed within a 3-week period. During the monitoring period, falling atmospheric pressure events approaching ‘worst case’ conditions were captured.

Outcome

GGS presented the multiple lines of evidence within a detailed ground gas risk assessment report. The project was completed within budget and a shorter period of time; less than two months from the start of monitoring to issue of the interpretive report.

The client is now considering the report findings as part of the site development feasibility.

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At GGS we provide a range of specialist ground-gas services for our clients within a variety of industries. We undertake a range of ground-gas monitoring methods, factual and interpretive reporting and consultancy.