Abstract: The apparatus is a chamber within a ground excavation filled with porous material, with multiple angled well shafts projecting outward and down from the chamber. A pump located within the chamber pumps ground water from the several well shafts to a collector above ground, while a second pump in a sump adjacent to the chamber collects and removes contaminants which flow toward the sump because of the cone of depression formed by the several angled wells removing ground water. The angled well shafts located below the sealed chamber yield a much larger cone of depression than a single well, and use many fewer pumps than would multiple isolated vertical wells. Another advantage is that the system can operate without significant structures above ground, so that the apparatus is particularly well suited for decontaminating locations such as rail yards and other high traffic locations.

Abstract: The apparatus is a pumping system for multiple wells which uses a single circulating pump and two or more venturi jet pumps, at least one jet pump for each well. The circulating pump furnishes feed water to the several jet pumps, with the vacuum line of each jet pump installed into a different well. Automatic level control within the well is furnished because when the liquid level falls, the jet pump vacuum line within the low level well draws air, and there is no effect on the pumping action of the jet pumps of other wells. Thus, if the level of liquid in a well drops, that pump simply pumps air and will resume pumping the liquid when the liquid once again covers the well pipe intake.