Investigation of landfill gases accumulated in underground (soil/subsoil) nearest municipal waste disposals

The purpose of the present paper is to show investigation results performed to identify
the landfill gases accumulated in underground (soil/subsoil) in 2 locations (case studies) situated
nearest municipal waste disposals. The investigation is focused in situ measurements with a portable
gas analyser for landfill gases (methane, oxygen, carbon monoxide, carbon dioxide and hydrogen
sulfide). For investigations was applied an intrusive method, respectively a manual drilling with
a hand auger equipment and the boreholes were equipped with polypropylene (PP) airtight pipes
provided with the gas tap. Drilling within 2-m depth permitted to describe a local lithology and to
identify the peculiarity aspects. To obtain more information about possibility of landfill gases to
migrate and accumulate ‘off site’ the main sources, the permeability tests was performed in laboratory. The characterization of the landfill gases accumulated in boreholes was performed in multiple
campaigns in order to obtain results in different weather conditions (temperature, pressure, precipitations) to establish a temporal evolution of these emissions. The investigations results will be applied
in the methodology of risk assessment in areas located in the vicinity of sources of landfill gases in
the framework of future developments.