Volatilization of organic chemicals from contaminated soils to the atmosphere and subsequent inhalation represents a potentially significant human exposure pathway. EMSOFT (Exposure Model for Soil-Organic Fate and Transport) is a screening model that may be used to assess the potential for such exposure to occur and quantify the mass flux of contaminants to the atmosphere over time. Mass fluxes can then be input to an atmospheric dispersion model to calculate exposure concentrations. Ingestion of contaminated soil and dermal contact also are potentially important exposure pathways requiring a soil contaminant concentration or estimate to ascertain possible risk. This model also can be used by risk assessors and exposure modelers to calculate chemical concentrations in surficial soil layers over time for assessment of these exposures. This model, based on the theory and studies of Jury et al. (1983, 1990), addresses situations in which contaminated soils are located at the surface and buried beneath a clean soil cover. Through a series of menus the user is prompted for several input choices to select a calculation method, chemical data, soil properties, and layer properties. The various calculation methods include Time-Averaged Flux, Flux vs. Time, Time- and Depth-Averaged Soil Concentration, Depth-Averaged Soil Concentration vs. Time and Soil Concentration vs. Depth. The user also has the option to determine cover layer thickness, layer (depth) thickness, and the time period for averaging flux and soil concentration. Input variables and their effect on model output are discussed. Several simplifying assumptions have been made to develop the model which include a steady porewater flux, homogeneous soil properties, and that chemicals are present in dissolved form and at low concentrations.