Residual petroleum products in the unsaturated zone represent a long-term source of soil and groundwater contamination. Using mathematical modeling, downward movement of dissolved petroleum products with infiltrating flow from the unsaturated zone consisting of loam and sand into groundwater was assessed at three contaminated sites by the series of modeling experiments. The results of modeling confirmed that even over hundreds of years residual kerosene will not be completely removed from the unsaturated zone, and kerosene concentrations in groundwater will exceed a maximum permissible level.

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