Abstract: An excavation apparatus includes a tank partitioned into two isolated chambers. One of the chambers is adapted to hold fresh water and communicates with a flexible wand to be carried by operating personnel. The other chamber is adapted to hold excavated material and communicates with a flexible hose also to be carried by operating personnel. A single, positive displacement vacuum pump driven by a motor is selectively connectable to one or both chambers through a series of valves and hoses. Depending on the valve positions, either the intake or exhaust port of the vacuum pump is in communication with one or both the chambers. The vacuum pump can therefore by used to fill the front chamber with fresh water as well as to pressurize the front chamber so that the water held therein can be discharged through the wand under pressure sufficient to dislodge earth at the excavation site. The vacuum pump can then be used to draw the dislodged earth and discharged water into the other chamber.