Dioxins and furans urban runoff

Urban runoff samples were collected in a 1-year period in the Santa Monica Bay watershed during both dry and storm periods and analyzed for polychlori nated dioxins, polychlorinated furans, and polychlorinated naphthalenes. Tr ace concentrations were found in nearly all of the samples collected. Durin g storms polychlorinated dioxin and polychlorinated furan concentrations pe aked. The congener and isomer profiles resemble profiles found in lake sedi ments and rainwater more than they resemble profiles found in urban sources such as dioxins from incinerators or dioxins in contaminated commercial pr oducts. Runoff from open land use had lower concentrations than runoff from developed land uses.