Lower Thames Crossing – Ground Surveys continue

Highways England (HE) is currently undertaking a series of surveys at locations throughout North Kent and Essex to help improve their proposals and support the Development Consent Order application.

As well as continuing with ground investigations, archaeological trial trenching and utility trial trenching, HE will now also be carrying out nail surveys which involves installing small survey nails along and near to the proposed route.

What are they doing?

Ground investigations

This mainly consists of drilling boreholes with a rig through soils up to depths of 60m, to identify the geology, obtain samples, and carry out tests.

Archaeological trial trenching

HE are digging shallow trenches with mechanical excavators to assess the archaeological features of a site. The trenches are approximately 30 metres long and 2 metres wide.

Utility trial trenching

HE are digging small trenches either by hand-digging or with the use of a vacuum excavator, before scanning for existing belowground utilities.

Survey nails

HE are installing survey nails to identify the geographic coordinates of the proposed route and associated works. They are small in size and designed to ensure that they are not a trip hazard.

Where will the investigations take place?

The borehole and trench locations are mainly on private farmland along or near to the proposed route.

For some of the utilities surveys, the works can also include public roads. The survey nails will be installed on private land and public pathways or roads.

When will the work take place?

This phase of surveys will continue until early 2021. Most of the work will take place Monday to Friday, between 8am and 6pm with the possibility of some weekends. HE will continue to write to nearby residents in advance to let the know what is happening and when.


For further information visit the Highways England Communities page here:

Lower Thames Crossing - Community Pages


Higham Parish Council