SESOIL

Unsaturated Soil Zone Transport and Fate Model SESOIL is a one-dimensional vertical transport model for the unsaturated (vadose) zone that simulates contaminant transport based on diffusion, adsorption, volatilization, biodegradation, cation exchange and hydrolysis. SESOIL is an acronym for the Seasonal Soil compartment model. It contains three sub-models that simultaneously simulate contaminant transport, soil water movement and soil erosion. It is the vadose zone model by which all other vadose zone models are judged. What sets SESOIL apart is its ability to simulate seasonal climatic variations and varying soil properties with depth. Mr. Robert Schneiker of ESCI, LLC modified SESOIL to run to 999 years and to simulate the migration of PFAS. Establish Site-Specific Cleanup Objectives SESOIL can be used to simulate the fate of residual contaminant levels in soil to establish site-specific cleanup objectives protective of groundwater quality. It can also simulate time-dependent releases from underground storage tanks, landfills, and agricultural practices. SEVIEW links SESOIL to the AT123D groundwater model.

History

SESOIL was developed for the US Environmental Protection Agency in 1981 by Bonazountas and Wagner, at Arthur D. Little, Inc. Since then SESOIL has been updated several times. SESOIL was modified extensively by David Hetrick at Oak Ridge National Laboratory to enhance its capabilities. SESOIL was modified in 1997 by Michael Barden then at the Wisconsin Department of Natural Resources to correct for a mass balance error. This mass balance error was discovered using SEVIEW. In 1997, Mr. Robert Schneiker of ESCI, LLC modified SESOIL to run to 999 years.