It is very simple process using high-pressure water set between 2000 psi and 5000 psi depending on the task, the high pressure is dispensed thru a spray gun blasting the soil into a slurry. This slurry is then removed from the trench or hole by a vacuum hose that is either 100mm or 150mm in diameter and transferred to a storage tank on the Vacuum Truck for disposal to an approved waste disposal facility. Terms and Conditions