Dynamic compaction is normally performed over a grid pattern to allow a consistent amount of energy to be applied to the underlying soils while at the same time looking for areas of differing ground response. Differing ground response normally shows itself in the form of different crater depths; observing this in real-time allows for adjustments to the program in the field as the work is taking place. The grid spacing, number of drops per impact point, drop height, and total number of passes depend on the amount of energy necessary to address the site-specific conditions. After each pass, the craters are leveled and compacted to allow for subsequent high-energy applications.
The tamper used in the dynamic compaction process is usually 5 or 6 feet in diameter, but can have widely varying contact pressures; the type of weight used on each job is tailored to the specific in situ soil conditions.