Vapor extraction is often used to remove volatile organic chemicals from unsaturated soils. Air inlet wells, which are left open to atmospheric pressure, are commonly installed around the extraction well to accelerate the removal of volatile contaminants. We employ the method of images in radial coordinates and the principle of superposition to develop an analytical solution for calculating the amount of air drawn in by inlet wells evenly spaced around an extraction well. Field tests of proposed vapor extraction systems can be compared with this solution to help evaluate whether gas flow will permeate the entire soil or will be concentrated in localized channels. ¿American Geophysical Union 1994