Abstract
A cement/bentonite wall was emplaced around the north-western part of the Drigg Low Level Waste Disposal Site in Cumbria during 1988 as a low permeability barrier to limit the flow of water into and out of the disposal trenches. It is therefore important to monitor the cut-off wall and assess its performance. A monitoring programme was established based around a test cell arrangement adjacent to the main wall. Preliminary results from these cells suggest that the wall has an in-situ bulk permeability of 10 −8 m/s compared to 10 −9 m/s from laboratory measurements of samples taken from the wall when it was emplaced. Measurement of water table levels around the test cells suggest that the wall and associated trench capping are reducing the water present in perched aquifers in the trench area. Sorption studies suggest that the cut-off wall may also retard the transport of some actinides and fission products.
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