ABSTRACT
Urban stormwater runoff has been identified as a major contributor to the degradation of many urban streams and rivers. Organic and metallic toxicants are expected to be responsible for much of these detrimental effects, and have been found in urban storm-induced discharges during many previous studies. The first phase included the collection and analysis of about 150 urban stormwater runoff and combined sewer overflow (SCSO) samples from a variety of source areas and under different rain conditions. Overall, in the first phase of the project about 300 sample components were analyzed to determine toxicant concentrations in sheetflows and other SCSO. In the second project phase toxicants treatability evaluations of a variety of bench-scale treatment processes were conducted. The second phase included the intensive analyses of 12 samples. Most SCSO physical treatment device removal efficiencies significantly relate to solids particle size and/or settling velocity distributions.
