I think cougar have this covered, one of the advantages of using 'proven' technology over 4o years. Can't say this unfortunately about CXY's fellow UCG players..
"The (ergo) εUCG process is designed and tested to prevent or minimize the other, more traditional environmental impacts on air, soil and water (including surface streams and groundwater). The process is conducted in such a way that gasification pressure in the gasifier is always slightly less than the hydrostatic pressure of fluid in the coal seam and surrounding strata. This creates a pressure gradient directed towards the gasifier. As a result, no flow from the gasifier into the surroundings is allowed, thereby preventing both the loss of valuable product and contamination of the underground environment. The thorough characterization of existing aquifers in the vicinity of the underground gasifier and careful monitoring of the hydrostatic pressure in the aquifers during operations, form an integral part of the εUCG groundwater protection strategy."
Exgo Exergy
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