There are a number of tissue concentration benchmarks included. Many of these are specific to a taxonomic group (avian, mammalian) or to a particular tissue. Sources included provide summary values potentially of use in screening. Measured or modeled site tissue concentrations are compared to these benchmarks to determine whether further investigations into potential risks to aquatic organisms or piscivorous wildlife are warranted. Two other good sources of tissue residue effects were not included because they do not condense reported studies into a recommended value for each chemical: Jarvinen, A.W., and G.T. Ankley. 1999. Linkage of effects to tissue residues: development of a comprehensive database for aquatic organisms exposed to inorganic and organic chemicals, Pensacola FL: Society of Environmental Toxicology and Chemistry (SETAC). 364 pp. and U.S. Army Corps of Engineers/ U.S. Environmental Protection Agency Environmental Residue-Effects Database (ERED). http://www.wes.army.mil/el/ered/index.html