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                 THETFORD VOIDS.


 In January 2005 a vehicle found itself perched over a large void in the road.

After removal of this vehicle an even larger void was exposed under the road (ref. Ground Engineering—February 2005.)


The void cut off access for any of the residents vehicles whilst repairwork on the road proceeded and some were unable to move their vehicles out of the cul-de-sac.


A Ground Probing Radar survey was undertaken using deep and shallow scanning antennas and which recorded a grid pattern of profile lines. Adjoining roads were surveyed for up to 100m from the collapse.


The integrity of the subsurface within the adjacent area was confirmed by the survey and this strengthened the view that water leakage had been the cause of the collapse.


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