air stripper assembly 98 the pump 78 exhausts to a vapor liquid separator 116 the vapor effluent of which is conducted to atmosphere or if appropriate to further processing through a pipe 118 the bulk of the liquid effluent from the vapor liquid separator 116 passes through a pipe 120 to a sump 122 where it joins the effluent of the pipe 106 the liquid output of the air stripper assembly 98 a fraction or all of the liquid effluent of the vapor liquid separator 116 may be drawn off through a line 124 to join the flow in the make up water line 112 servicing the liquid ring pump 78 a pump 126 controlled by a low level cut off switch 128 draws liquid from the sump 122 and propels it through a pipe 130 for further processing in the illustrated embodiment the liquid is passed in two stages through cannisters 132 and 134 containing granular activated carbon other contaminant removal steps or techniques may be used the treated water emerges through a pipe 136 and is of sufficient purity to allow its return to the soil or a sewer without further treatment as was mentioned above a major advantage of the application of two phase vacuum extraction in accordance with the present invention is that the rate of production of groundwater may be significantly increased over conventional single phase flow.