National Geological Screening for a GDF - London and the Thames Valley region
Our work shows that we may find a suitable geological setting for a GDF in most of this subregion.
Although rock cannot generally be seen at the surface in this subregion except in man-made excavations such as quarries and road cuttings, numerous deep boreholes and geophysical investigations give us an understanding of the rocks present and their distribution.
There are clay-rich rock layers under the whole subregion in which we may be able to site a GDF. There are also granites and similar strong rocks to the north of Milton Keynes, in which we may be able to site a GDF. These rocks have only been found in a handful of boreholes and we would need to do more work to find out whether these rocks have suitable properties and thicknesses in the depth range of interest for a GDF.
Even where individual clay-rich rock layers are found not to be thick enough to host a GDF they may support the siting of a GDF in deeper rocks as they could act as a barrier to groundwater flow from depth. This is important because movement of groundwater is one of the ways in which radioactive material could be carried back to the surface.
For further information, read the report below.
We have also produced a summary of the geological attributes of the London and the Thames Valley Region.