Stormwater runoff from urban areas, including industrial, transportation, commercial, residential and other urban land uses, contain concentrations of pollutants that could be of concern for recontamination of sediment remediation sites.
The potential for stormwater-based recontamination, either real or perceived, can limit the ability to attract interest in Brownfield redevelopment (along with the typical issues of liabilities for the initial remediation). As sediment clean-up targets become lower, urban runoff will become a more important source for many constituents, including heavy metals, dioxins, and other pollutants. Over the last several years, our understanding of the effectiveness of stormwater runoff controls has been significantly improved via the consideration of unit processes information in BMP selection and design, along with improved observational information on Stormwater Best Management Practice (BMP) performance. This paper presents information on the pollutant recontamination pathways and their types and characteristics in urban and industrial stormwater and how they could potentially contribute to sediment recontamination issues.