Rammed Aggregate Columns, which we install under the trade name Terrapiers, can also be an excellent solution when ground improvement is needed.  However, Terrapiers commonly cost 2 to 10 times the cost of dynamic compaction, and we would never advise the more costly option unless it was necessary.  As the only contractor who uses both methods, we are uniquely qualified to assist your design team in determining the most appropriate ground improvement solution for your project.