Abstract: A subterranean pump of compact design can be inserted into boreholes commonly used for exploratory drill holes to observe subterranean contaminants. The pump operates at the water-oil interface so as to draw off contaminating oil while avoiding the unnecessary pumping of water which would deplete the capacity of the pump. Preferably, the subterranean pump is a jet pump (ejector or educator) which operates on fluids pumped back down-hole by an above ground auxiliary pump. The down-hole pump is maintained at the water-oil interface by floats or other sensors which detect the water-oil interface and operate an electrical hoist or other lifting device to raise and lower the pump in the borehole.

Abstract: A thermal barrier is provided that includes a pair of sheets made of a material such as suitable plastic, and wherein the pair of sheets interfit to form a hollow panel. Compressible cellular foam material is mounted on the outer edges of the panel. Ambient air is adapted to be removed from the interior of the panel, and dry air or inert gas is adapted to be introduced into the hollow panel. Angle clips are provided for helping to maintain the barrier in its proper assembled position.