Ground Gas Monitoring
In-situ ground gas monitoring is undertaken to determine the level of ground gas protection measures required.
Borehole installations are monitored with an infra-red landfill gas analyser for methane, carbon dioxide and oxygen levels, and sometimes hydrogen sulphide and carbon monoxide. Gas flow rates, atmospheric pressure and other environmental conditions are also recorded.
Volatile organic compounds (VOCs) can also be monitored with a photo ionisation detector (PID).
Gas Monitoring for Residential Development in Cornwall
Ruddlesden geotechnical have been undertaking ground gas monitoring to provide data for a ground gas assessmentfor the proposed residential development of land near Newquay, Cornwall.
The Phase 1 Preliminary Contamination Assessment and mining risk assessmentidentified that an Elvan Dyke (coarse-grained igneous intrusion) had previously been quarried within the centre of the proposed development site and that the quarry had subsequently been used as a landfill site and infilled with domestic refuse.
As part of the contaminated land assessment, ground gas monitoring wells were installed within windowless sample boreholes, to facilitate the long-term ground gas monitoring.
Ruddlesden geotechnical use an infra-red gas analyser to monitor levels of carbon dioxide, methane, oxygen, carbon monoxide, hydrogen sulphide and gas flow.