Guidance

Pennines and adjacent areas - Subregion 4

National Geological Screening for a GDF - Pennines region

Details

Pennines, subregion 4

Our work shows that we may find a suitable geological setting for a GDF in most of this subregion.

Rock cannot generally be seen at the surface in this subregion, except in man-made excavations such as quarries or road cuttings. However, numerous deep deep boreholes and geophysical investigations give us an understanding of the rocks present and their distribution.

There are various types of gaps in our understanding of geology and we deal with these gaps in a number of ways.

There are clay-rich rock layers, in which we may be able to site a GDF, under most of the sub-region. There are also layers of rock salt between Southport and Lancaster and off the coast of much of the sub-region, in which we may be able to site a facility. We would need to do more work to find out whether these rocks have suitable properties and thicknesses.

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.

Some of the subregion has been mined for coal to depths below 100m, around Warrington and west of Ellesmere Port and there are also known oil and gas resources off the coast from Southport, east of Blackpool and near Warrington. In these areas the mining and drilling is likely to have affected the way in which water moves through the rock. Also possible exploration in the future in these areas means that it is more likely that future generations may disturb a facility.

Much of the onshore and parts of this subregion off the coast have Petroleum Exploration & Development Licences to allow companies to explore for oil and gas. This exploration is currently at an early stage and it is not known whether oil or gas in these licence areas will be exploited. RWM will continue to monitor how this exploration programme progresses.

Parts of this area, off the coast around Liverpool, are Coal Authority Licence Areas allowing companies to explore for coal. It is not known whether coal in these licence areas will be exploited. RWM will also continue to monitor how this exploration programme progresses.

Parts of the subregion which are mined for rock salt, such as around Fleetwood, would also need to be taken into account in the siting of a GDF, although the nature of mining in evaporites does not affect the movement of groundwater in the surrounding rocks in the same way as other mining.

For further information, read the report below.

Pennines and adjacent areas - Subregion 4

This file may not be suitable for users of assistive technology. Request an accessible format.

If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email rwmfeedback@nda.gov.uk. Please tell us what format you need. It will help us if you say what assistive technology you use.

We have produced a summary of the geological attributes of the Pennines and adjacent areas Region.

Go to National Geological Screening for a GDF

Go to geological disposal homepage

Published 19 December 2018