Patent Number: 
Section: claims

1. A containment system for controlling the migration of fluid from a contaminate source comprising:a containment grid comprising a plurality of cooling channels, said grid defining a plurality of regions between adjacent cooling channels;an aggregate comprising frozen water and soil, said aggregate in thermal communication with the plurality of cooling channels and occupying the regions between adjacent cooling channels;wherein said containment grid is adapted to form a partial envelope around the contaminate source beneath the ground surface;a variable water permeable region in the containment grid; anda sensor for determining contamination;wherein the plurality of cooling channels form an hour glass shape, the hour glass shape defined by concentric circles with increasing diameters and increasing height above the variable water permeable region and concentric circles with increasing diameters and increasing vertical distance below the variable water permeable region. 2. The containment system of claim 1, further comprising:a plurality of valves on the respective cooling channels;said plurality of valves are operable to control the flow of cooling media in the respective cooling channels;wherein the area of the variable water permeable region is a function of operation of the valves.