Monte Carlo / Sensitivity Analysis / Multidisciplinary / Great Lakes Region / Model validation / Case Study / Surface Water / Partition Coefficient / Spatial Distribution / Organic carbon / Chemical Properties / Environmental Pollutants / Monte Carlo Method / Hexachlorobenzene / Case Study / Surface Water / Partition Coefficient / Spatial Distribution / Organic carbon / Chemical Properties / Environmental Pollutants / Monte Carlo Method / Hexachlorobenzene