What about vibrations?

Vibrations are not as high as most people would expect.  We have worked within 50 feet of existing buildings, and withing 15 feet of underground utilities without causing damage.  A much bigger concern in most cases is public perception, because you can feel the vibration long before its strong enough to cause damage.  IT is often very important to document conditions of surrounding buildings before dynamic compaction, and to monitor vibrations throughout the construction process.