Soil injected fumigants are quite volatile which enhances their ability to diffuse through soil and control pests, but also results in the potential for evaporation from the soil and subsequent off-site movement via air dispersion. A stochastic/deterministic numerical system (SOil Fumigant Exposure Assessment system [SOFEA]) was developed using the US EPA air dispersion model ISCST3, field observed 1,3-D flux, and links to Geographic Information Systems (GIS). SOFEA was used retrospectively to simulate concentrations of 1,3-D in air for direct comparison with continuously monitored concentrations of 1,3-D at 9 locations within 9 contiguous high use townships in Merced County, CA. All 1,3-D applications, including field size, application rate, application depth, and exact field location in the 9 Merced townships have been tracked for a period of 14 months. The general approach to the model validation is described, including the georeferencing of 1,3-D application inputs and model output at specific receptor locations.

Validation of a regional air dispersion modeling system (SOFEA) with long-term continuous measurements of air concentrations of 1,3-dichloropropene

244th National Meeting (2012)

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