Abstract: An bailer apparatus for collecting a sample from a body of fluid comprising an elongated hollow body receptacle having first and second ends and defining a chamber therebetween. A valve device is provided for permitting fluid to enter the chamber and be retained therein as a collected sample. At least a portion of the bailer is constructed from an inert, high density plastic material having a specific gravity greater than water, the overall specific gravity of the apparatus being greater than the specific gravity of the body of fluid to be sampled so as to cause the apparatus to sufficiently sink for sample collection.

Abstract: A device for selectively extracting fluid samples from a plurality of zones within an underground formation comprising an elongated tube including a wall having internal and external surfaces, the elongated tube having at least one spaced circumferential filter region disposed within the tube wall. The filter region is provided with a circumferential recess portion having an elongated wall extending within the tube external surface. A filter having internal and external surfaces is positioned within the filter region circumferential recess portion such that the elongated wall of the filter region is spaced from the filter internal surface to form a chamber therebetween. The inner surface of the tube has at least one passage opening to the chamber. The passage has a diameter substantially less than the length of the filter and the chamber. A sliding assembly is provided having a pair of sealing balloons and vacuum extraction apparatus.

Abstract: A locking cap for securing the open end of a well pipe to prevent contaminants from entering the well comprising a cap member adapted to be disposed over the open end of a well pipe casing to be locked, an outer flange downwardly extending from the cap member and integral therewith, the outer flange adapted to fit over the exterior surface of the well pipe casing to be locked, inner flange downwardly extending from the cap member and integral therewith, the inner flange adapted to fit about the interior surface of the well pipe casing to be locked, the inner flange including a series of parallel slots extending longitudinally inward from the end of the inner flange and towards the cap member to provide a series of radially expandable gripping fingers positioned along the perimeter of the well pipe casing interior surface, a cam disk positioned coaxially adjacent the inner flange, the cam disk being selectively movable against the fingers to radially expand each of the fingers into binding engagement against t

Abstract: A hoist for lifting and lowering an equipment in a well comprises base member; a belt for removably securing the base member to a vertical wall portion of the well casing; a boom with its first end being secured to the base member and its second end extending above the well casing; and a winch assembly operably associated with the boom for lowering and lifting the equipment in the well.

Abstract: An apparatus for driving a sampling pump disposed in a monitoring well comprises a structural support member including a container for pressurized gas; a platform having a top surface and supported by the structural member; an air compressor secured on the top surface and operably connected to the container; a venturi for generating a vacuum from the pressurized gas in the container; an engine for driving the air compressor; and a controller operably connected to the container, the generating means and the sampling pump for alternately directing compressed air and vacuum to the pump to thereby operate the pump.

Abstract: A lysimeter comprises a longitudinally extending circumferentially perforated duct having a vacuum application connection at one end thereof. A fluid permeable fabric is superposed over the duct perforations. A longitudinally extending circumferentially perforated shell extends about the duct and therewith defines a bounded volume therebetween. A granular filler substantially fills the bounded volume and the filler is sized so not to be drawn through the fluid permeable fabric so that a vacuum applied to the duct is transmitted through the shell.A ground protection system for a heap leaching site incorporating the lysimeter of the present invention is also disclosed as well as a method of assembling the lysimeter.

Abstract: An improved lysimeter is described for collecting soil water which is truly representative of the soil water contained in the soil at selected locations. The lysimeter contains a chamber and a filter section which is a rigid, porous fluoroplastic and through which moisture from the soil surrounding the lysimeter may pass into the chamber. The invention also includes a process for using the lysimeter to recover soil moisture in the lysimeter chamber.

Abstract: A lysimeter for collecting soil water which is truly representative of the soil water contained in the soil at selected locations. The lysimeter contains a chamber and a filter section which is a rigid, porous fluoroplastic and through which moisture from the soil surrounding the lysimeter may pass into the chamber. The invention includes the rigid porous thermoplastic resin, a process for making the resin and a process for using the lysimeter to recover soil moisture in the lysimeter chamber.