Apparatus for removing contaminants from a contaminated area
An apparatus for removing contaminants from a contaminated area (12) of the subsurface (1820) which comprises a riser pipe (44) extending downwardly from the surface and having an upper impermeable portion (46) and a lower perforated portion (48) a vacuum extraction pipe (30) situated inside of the riser pipe (44) and having an opening situated within the perforated portion an actuable packing (61) situated in a portion of the annular space between the vacuum extraction pipe (30) and the riser pipe (44) said portion having a vertical extension being significantly smaller than a vertical ext