ESTIMATION OF THE AIR PERMEABILITY COEFFICIENT AND THE RADIUS OF VACUUM INFLUENCE FOR CONTAMINATED SOIL AND GROUNDWATER REMEDIATION

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The air permeability coefficient and the radius of vacuum influence are important parameters in the design of soil vapor extraction systems for removing volatile organic chemicals, but procedures for obtaining these parameters have not yet been established. We developed procedures using previously derived analytical equations for the relationship between air discharge rates from an extraction well and the air pressure head generated in the neighborhood of the extraction well in soil with a uniform degree of water saturation in order to obtain these parameters in soil with varying degrees of water saturation. We verified that these procedures could be used to obtain these parameters by using air permeability test data from five sites. In addition, we demonstrated that these procedures could also be applied to gravel soil with fast air flow.