Tiefenthaler et al. (2007) Tiefenthaler L. L., Stein E. D. & Schiff K. C. 2007. Watershed and land use-based sources of trace metals in urban storm water. Environmental Toxicology and Chemistry, Vol. 27, No 2, pp 277-287, 2008. Median EMC. Los Angeles River watershed. (2001-2005). Values from the present study.