Abstract: A system is installed in the subsurface to control the hydraulic gradient between the area within a containment system and the area outside the containment system, and provides an easy-to-maintain treatment system. Preferably, the treatment system includes a sufficiently sized conduit between the inside-area and the outside-area that is accessible via a manhole. This conduit can be filled with remedial material or other treatment equipment, the manhole-sized access providing a relatively easy means of providing, maintaining, and replacing this material and equipment. Because the conduit is appropriately sized, hydraulic pressures on either side of the open conduit can be expected to be substantially equal, thereby reducing the potential of leakage of contaminants caused by hydrostatic pressure. Gates and screens are provided on either side of the conduit, to facilitate flow control, with manhole accessways to facilitate maintenance of these gates and screens.

Abstract: A column mount is provided which is particularly useful in a machine tool capable of being assembled to perform either horizontal or vertical machining operations. The mount includes an adjustably movable support member for reciprocating a tool bit head assembly over a given length along a column, the column extending vertically from the machining tool when performing vertical machining operations. The mount operates to allow the head assembly support member to be adjustably reciprocated from a selected starting position on the column above a workpiece, and enables the support member to be readily moved along the column to the desired position.