Patent attributes
A method and system for removing non-aqueous phase liquids (NAPL) from geologic media below the surface of the ground, employing a flexible liner disposed down a borehole. A flexible carrier liner has an absorbent outer cover composed of a NAPL-absorbent outer layer and a NAPL-absorbent inner layer, both preferably hydrophobic. The liner with outer cover is placed down the borehole, preferably but not necessarily by eversion. Liner placement presses the absorbent outer layer against the borehole wall. NAPL in the groundwater adjacent the outer layer is absorbed into the outer layer and then wicked into the inner layer. The liner and outer cover can then be extracted from the borehole to remove from the subsurface the NAPL absorbed in the cover's absorbent layers. If portions of the liner are transparent, a down-hole camera may be deployed to monitor the degree of NAPL absorption in the absorbent inner layer.
