Geophysical surveys have been a bit like buses for Ruddlesden geotechnical this year: last year, we did not see one at all; this last month, we have completed two!

At the right site with the appropriate technique, geophysics can be an extremely useful tool that provides data which might not be obtainable in other ways. Early engagement with the geophysical specialist allows them to determine, use and interpret which of their technique(s) would be most suitable.

On these two sites, different problems have been solved using different techniques. On one site, the locations and extent of subsurface man-made chambers have been determined using GPR prior to intrusive investigation. On the second site, the locations and extent of natural solution features identified during ground investigation have been confirmed using electro-magnetics.