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Non-Destructive Subsurface Inspection

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>From: "Kirk Pysher" <KDPysher(--nospam--at)>
>Subject: Non-Destructive Subsurface Inspection

>I am interested to find out if there is an inexpensive solution for
>finding subsurface voids (sinkholes) via ultrasound etc.  If so can
>it be used directly on the surface of the soil and also through a
>concrete slab.  If anyone has any experience with this type of NDT
>please let me know.

The technique you need is called Ground Penetrating Radar.  It is a
nondestructive technique for locating subsurface voids, using
radar, as the name implies.  You can contact Geophysical Survey
Systems, inc. of North Salem, New Hampshire for more information.

Brian Kehoe