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Physical Processes Affecting Natural Depletion of Volatile Chemicals in Soil and Groundwater

Geosciences and Environmental Engineering Group, Environmental Science Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge TN 37831-6036

View larger version (23K): [in a new window]   Fig. 1. Ratio of dispersive flux associated with water table fluctuations to diffusive flux vs. soil depth for various parameter values.

View larger version (28K): [in a new window]   Fig. 2. Ratio of dispersive flux associated with barometric pumping to diffusive flux vs. soil depth for ßP/Potbp = 10-5 (top) or 10-3 (bottom).

View larger version (20K): [in a new window]   Fig. 3. Apparent first-order volatilization coefficients vs. groundwater depth for selected air permeability, air saturation, unsaturated zone water fluxes, and other parameters described in text.

View larger version (23K): [in a new window]   Fig. 4. Apparent first-order volatilization coefficients vs. groundwater depth as a function of saturated zone vertical dispersivity.

View larger version (19K): [in a new window]   Fig. 5. Soil NAPL depletion vs. time due to volatilization and leaching with different hydraulic fluxes for example problem.