Modeling Advective Contaminant Transport During Soil Vapor Extraction

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Abstract
A general semianalytical method for modeling the advective transport of a volatile organic compound (VOC) to a soil vapor extraction well has been developed. Assuming that the VOC is not present in the form of a nonaqueous phase liquid (NAPL), this technique is applicable to cases in which the VOC is partitioned in the unsaturated zone between the gas, aqueous, and solid phases. The VOC may have a one‐, two‐, or three‐dimensional initial distribution. The method may be applied to problems having a one‐ or two‐dimensional steady‐state gas flow field in which the gas streamfunction and gas travel time distributions are known. Examples are included to show the application of the method to radial and two‐ dimensional cylindrical gas flow fields with different VOC distributions and characteristics.