GGIS No 2 – Dissolved methane monitoring for ground gas risk assessment

ABSTRACT

Ground gas monitoring data for risk assessment should ideally be obtained from monitoring wells installed in the unsaturated zone. Where groundwater is present in gas monitoring wells it may contain dissolved methane that can influence the measured gas concentrations in the well headspace. The source of the dissolved methane can be from a diverse range of sources including residual gas from historic landfill, groundwater in Alluvial soils or methane released because of shale gas production.

This paper provides information on the influence of dissolved methane on headspace gas concentration and shows how monitoring of dissolved methane can be used to help interpret ground gas monitoring results.

September 5, 2018

Steve Wilson

MSc BEng CEng MICE CEnv CSci CWEM MCIWEM FGS

Technical Director

    Sarah Haines

    Principal Engineer

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