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Remedial Investigation and Baseline Risk Assessment Report for the Inaccessible Soil Operable Unit at the St. Louis Downtown Site 5.0 CONTAMINANT FATE AND TRANSPORT



The mobility and persistence of a contaminant in the environment are significant in determining the environmental fate and transport of that contaminant. Contaminant fate and transport are also dependent on the chemical and physical characteristics of the site and environmental medium in which the contaminant resides. Examples of chemical characteristics of the site/medium include pH of the soil and water, organic content of soil, oxidation-reduction potential (ORP), and the presence of inorganics (e.g., carbonates, sulfates, iron). Examples of physical characteristics include geological and hydrological parameters (e.g. hydraulic conductivity, porosity, and hydraulic gradients), temperature, the presence of surface water bodies, buildings, ground cover, etc. Additionally, the presence or absence of oxygen and microbial organisms in the environmental medium could determine the persistence of certain contaminants, particularly organic contaminants. Although the degree of impact is uncertain, because of the capacity of some contaminants to move from one medium to another or to become degraded by one or more biotic and/or abiotic processes, the analysis of contaminant fate and transport can be used to assess the potential rate of migration and fate of contaminants. Analysis of contaminant fate and transport provides information that can be used to suppor

Year: 2013
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