Patent ID: 6261029
Filing Date: 2001-07-17
Classification: B09C,E21B

Abstract:
A method for remedying contamination of a subsurface region by a non-aqueous phase liquid (DNAPL) that is denser than water, the subsurface region having a resident aqueous phase and a DNAPL phase, the method comprising the steps of:(a) introducing a dense solution layer (DSL) that has a density greater than the density of the DNAPL phase beneath the subsurface region contaminated with the DNAPL phase;(b) dewatering downwardly to the top of the dense solution layer (DSL) so as to create an unsaturated porous medium above the dense solution layer (DSL) and to downwardly mobilize the DNAPL phase to the top of the dense solution layer (DSL); and(c) collecting the DNAPL phase from the top of the dense solution layer (DSL) and thereby substantially remedying contamination of the subsurface region.