Patents Assigned to ETG Environmental, Inc.-MWR Division
  • Method of recovering subsurface contaminants
    Patent number: 5342147
    Abstract: A method of recovering contaminants entrained in subsurface soils which includes establishing a plurality of vacuum withdrawal wells and a plurality of air injection wells adjacent to a contaminated zone of earth. The method includes operating the wells in this fashion for a predetermined time, then reversing the air flow through one or more of the wells to effect contaminant removal in previously untreated nodes in the well field.
    Type: Grant
    Filed: September 24, 1993
    Date of Patent: August 30, 1994
    Assignee: ETG Environmental, Inc.-MWR Division
    Inventors: Frederick C. Payne, Galen L. Kilmer