The original SOFEA model was first described in 2005 in addressing the need to model chemical concentrations in ambient air in basins spanning several California (CA) townships and assess long-term human inhalation exposures and potential human health risks associated with the soil fumigant 1,3-dichloropropene (1,3-D). Originally a pre- and post-processor for the ISCST3 air dispersion model, SOFEA was updated in 2016 to incorporate the AMS/EPA Regulatory Model (AERMOD). SOFEA allows users to probabilistically generate input files using over 20 discrete and continuous probability distributions for input parameters, and provides graphical tools for analyzing weather data, creating flux profiles, importing source geometry from GIS data, generating receptors using computational geometry methods, and high-performance post-processing of results using the netCDF scientific data format incorporated directly into AERMOD. In a collaborative effort between Corteva Agriscience and Exponent, Inc. SOFEA was upgraded to modern software engineering standards, and a new graphical interface was developed with C++ and Qt to provide users an Integrated Development Environment-like (IDE) experience in creating new simulation projects. Summary statistics, moving averages and quantiles can be calculated efficiently over millions of data points, comprising hourly concentrations over several years and thousands of receptors. A Beta version of the model is currently being tested and evaluated and is the basis for this talk. SOFEA will be made publicly available online via Exponent, Inc. in mid-2019 for use with other volatile or semi-volatile chemicals.

Development of the soil fumigant exposure assessment (SOFEA) model

2019 Fall National Meeting

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