Chemical contaminant reactions and assessment of soil cleanup levels for protection of groundwater |
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| Authors: | D M Kargbo |
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| Institution: | (1) U S Environmental Protection Agency, 841 Chestnut Bldg.(3HW13), 19107 Philadelphia, Pennsylvania, USA |
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| Abstract: | About 70 percent of hazardous waste sites listed in the National Priority List (NPL) have some groundwater contamination that may require remediation. Such remediation is inadequate if the unsaturated soils above will continue to act as a source of groundwater contamination. Consequently, for most of these sites, it becomes necessary to determine what the cleanup levels for contaminants in soils should be so that subsequent contribution of contaminants from these soils to groundwater would not exceed groundwater protection levels. Representation of the dynamics of interactions between contaminants and soils is very complex, requiring among others, a thorough understanding of the chemical processes that influence the behavior of the contaminant once it enters the subsurface. Because of such complexities, environmental professionals frequently utilize methods with very simple assumptions that tend to err on the conservative side. While the public may feel protected, the needless spending of dollars could be avoided if attempts are made to incorporate, where possible, such complexities in the modeling efforts so that the system is represented as accurately as possible. |
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| Keywords: | Non equilibrium Cosolvation Ionization Redox |
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