TfL have conducted a series of ground investigation works as part of the preparation for the proposed Northern line extension. This involved the drilling down through bore holes to take soil samples. The information found through this exercise will help in planning the construction work.

The samples taken in Lambeth were all taken on land owned by Lambeth Council and we are now making the full report on these samples public.

Please note this information is very technical. The contractor who will be constructing the extension will compile a report which will clearly summarise these findings, how they will inform design proposals and what mitigating measures are proposed.

This report will be presented to the Northern line extension Community Liaison Groups in early 2015 and made available on TfL’s website.