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A geo-referenced environmental fate model was developed for analyzing unsteady-state dispersion and distribution of chemicals in multimedia environmental systems. In this model, chemical transport processes in various environmental media were incorporated in a GIS-based framework, to support spatial characterization and time-dependent parameter estimation at watershed scale. A set of equations were established to formulate the inter-media mass transport processes across environmental compartments. The transport and reaction coefficients were estimated by theoretical and empirical methods adopted from the literature. Spatial and temporal variations of input parameters were provided to accurately represent the chemical fate in environment. Information obtained from the newly developed model, including chemical mass distribution in various media and inter-media mass fluxes, was anticipated useful in exposure and risk analyses. The applicability of this model was illustrated in this paper for the dynamic distribution of trichloroethylene (TCE) in the Connecticut River Basin. The level of predictive multimedia analysis represented in the model application yields very reasonable agreement with reported measurements or simulation results from well-validated models.