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1L - Exposure Modelling (WEP/77) Use of GIS-ROUT for Regional, National Exposure and Risk Assessment and Eco-epidemiology. Dyer, Scott 1, Homer, Michael1, White-Hull, Charlotte1, Wang, Xinhao2, 1 The Procter & Gamble Company, Cincinnati, Ohio, USA2 University of Cincinnati, Cincinnati, Ohio, USA ABSTRACT- GIS-ROUT is a regional and national scale watershed model that predicts river concentrations of down the drain consumer product ingredients and conventional pollutants for perennially flowing streams in the coterminous USA. The model uses several large USEPA databases, including: the Clean Water Needs Survey, SDWIS (Safe Drinking Water Information System), and the Reach File 1 (RF1). Each of the databases, model and output are managed via a geographic information system (GIS). Per capita use of ingredients from consumer products can be loaded via national, watershed and market regions where upon wastewater treatment plant influent, effluent and resulting instream concentrations are predicted. Coupling GIS-ROUT outputs with single species sensitivity distributions provides a measure of potential risk by river segment. Via additivity principles a multi-substance potentially affected fraction (ms-PAF) for aquatic taxa can be predicted. Hence, GIS-ROUT provides a basis for developing and exploring scenarios for single chemicals and complex mixtures emanating from municipal wastewater treatment plants. Retrospective modeling (e.g., former consumer purchase and use patterns) are essential for evaluating the validity of ecotoxicological models, particularly when model outputs are compared to field collections of habitat and biological communities (eco-epidemiology). Key words: watershed, water quality, exposure, consumer product |
