INSEA (Incineration at SEA) is a screening tool to estimate the maximum allowable concentration of wastes that can be incinerated at sea without exceeding standards for marine aquatic life. The relationship between the water quality standards and the maximum allowable concentrations in the incinerator feed are defined by the processes considered by the model. A consistent bias toward conservatism in the model is required to compensate for the present inability to reliably predict many of the processes that may occur in the atmosphere and ocean, or to measure the parameters that could be used to define these processes. The model considers the primary atmospheric and oceanic processes that are responsible for dispersing the incinerator emissions into the environment. These processes are dispersion and transport of the contaminant plume in the atmosphere and dispersion and advection of the contaminant in the ocean.