Laboratory experiments were carried out in a closed cell to determine the effective diffusion coefficient of gaseous oxygen through a needle punched geosynthetic clay liner with a top geotextile carrier impregnated with bentonite. It was observed that the diffusion coefficient decreased with the increase of the degree of saturation. The effective diffusion coefficients were obtained by fitting the time oxygen concentration data to curves obtained from a finite layer contaminant transport computer program (POLLUTE®). These curves were verified by an empirical model and finite element programs (SEEPW®/CTRANW®). The analysis of the data obtained in the present investigation show that the empirical model and the theoretical solutions provided by the finite element method and the finite layer method, represent observations quite well.
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