Abstract
A multimedia equilibrium model was developed to assess the distribution and environmental concentrations using availableGeographical Information Systems (GIS) databases on the Passaic River Watershed in New Jersey. This assessment was conducted in seven compartments (air, water, sediment, surface soil, terrestrial vegetation, root zone soil and vadose zone soil) and eighteen sub-compartments of the watershed. A spatial resolution is introduced by modeling the watershed as a series of inter-connected sub-watersheds. The watershed representation presents several benefits including a consistent data set since the New Jersey Department of Environmental Protection (NJDEP) regulated facilities and environmental monitoring stations are distributed based on the watershed. The fugacity model developed herein was validated using the peer-reviewed ChemCAN model. Its application to the watershed provided important insights into the fate of contaminants, and better decisions for controlling releases. Furthermore, the inclusion of spatial resolution improved on the results of steady state and equilibrium multimedia model by several orders of magnitude.
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