(Our) project consisted of 3,600 lineal feet of 12” sewer install down an existing roadway with an average depth of 20 vertical feet. The reason behind the compactor wheel is because the vertical walls of the trench couldn’t withstand the vibration used by standard compaction equipment without causing cave ins and loosing additional roadway.  By using the compactor wheel we are able to safely compact the narrow ditch and help minimize the footprint of the project.