Chapter 20: A Comparison of Three Geophysical Methods for Characterizing Air Flow from an Air Sparging Well
David L. Alumbaugh, Douglas P. Simon, Craig H. Benson, 2005. "A Comparison of Three Geophysical Methods for Characterizing Air Flow from an Air Sparging Well", Near-Surface Geophysics, Dwain K. Butler
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In-situ air sparging (IAS) is a remediation technique that uses air to remove volatile and degradable contaminants from soil and groundwater. Air is injected below the water table, and then travels upward toward the surface due to buoyant pressures. Volatile contaminants are removed as they partition into the flowing air. Air also dissolves into the groundwater, which increases the oxygen content thereby stimulating aerobic biodegradation. The injected air generally forms a plume that passes through the soil in a series of channels.
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Near-surface geophysics uses the investigational methods of geophysics to study the nature of the very outermost part of the earth’s crust. Man interacts with this part of the earth’s crust: he walks on it; he drills and excavates into it; he constructs structures on and in it; he utilizes its water and mineral resources; and his wastes are stored on and in it and seep into it. The very outermost part of the Earth’s crust is extremely dynamic-in both technical (physical properties) and nontechnical (political, social, legal) terms-which leads to both technical and nontechnical challenges that are much different than the challenges faced by “traditional” applications of geophysics for regional geologic mapping and for oil and gas exploration (see Chapter 2).