oa Below-liner geophysical monitoring at a landfill site in the UK

The UK's first electrical monitoring system to be permanently installed below the geomembrane liner of a landfill site has now been operational for two years. The system, developed jointly by Aspinwall and Company, the University of Birmingham and Campus Geophysical Instruments, is installed at a site operated by Cleanaway Ltd and consists of a basic 20 m grid of electrodes emplaced below a 0.3 m layer of Bentonite enriched sand (BES), underlying a 2.5 mm thick HDPE geomembrane liner. Similar systems have been developed and used in the United States (e.g. Van et. aL, 1991), and elsewhere in Europe (e.g. Frangos, 1994).