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SOIL-AIR PERMEABILITY MEASUREMENT WITH A TRANSIENT PRESSURE BUILDUP METHOD
Citation:
Cho*, J S. AND D. Ellett. SOIL-AIR PERMEABILITY MEASUREMENT WITH A TRANSIENT PRESSURE BUILDUP METHOD. Hazardous Waste and Hazardous Materials 12(4):365-371, (1995).
Impact/Purpose:
To observe soil-air permeabilities obtained from the transient pressure buildup method.
Description:
An analytical solution for transient pressure change in a single venting well was derived from mass conservation of air, Darcy's law of flow in porous media, and the ideal gas law equation of state. Slopes of plots of Pw2 against ln (t+Δt)/Δt similar to Homer's plot were used to estimate the permeability in the vicinity of the well. The idea was tested using equipment driven manually into subsurface soil to determine the soil-air permeability without an extensive investment of time and with minimal site disturbance. Tests were run at four locations in a tight clay formation. Soil-air permeabilities obtained from this method were found to be consistent and compatible with those of similar types of soil.
