The present invention discloses a method and apparatus for extracting contaminants from the ground using a vacuum extraction process. Specifically the invention discloses a circuit that can control the flow of atmospheric air into a vacuum extraction well. By controlling the air flow into the well the air flow circuit serves to regulate the vacuum that is applied to sub-surface contaminants. This vacuum lifts the contaminated effluent from the ground so it can be subjected to further processing.
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