Abstract Detail

Ecology

Carleton, Jim [1], Donovan, Elizabeth [2], Garber, Kris [3], Farruggia, Frank Thomas [4], Jones, R. David [5], Kiernan, Brian [3], Odenkirchen, Ed [5], Peck, Chuck [5], Sankula, Sujatha [6], Young, Dirk [7].

Audrey III - EPA's Tier II Plant Exposure Estimation Tool.

The United States Environmental Protection Agency’s Office of Pesticide Programs Environmental Fate and Effects Division (EFED) is developing a replacement for the TerrPlant model, which is used to estimate pesticide exposures to plants inhabiting terrestrial and wetland habitats. Conceptually, this model considers pesticide transport via spray drift and runoff from treated areas into and onto adjacent non-target habitats. The new model, Audrey III, makes use of existing models currently employed for exposure estimate by EPA, including AgDRIFT, the Pesticide Root Zone Model (PRZM5), and the Variable Volume Water Model (VVWM). In Audrey III, the terrestrial exposure model is focuses on a conceptual Terrestrial Plant Exposure Zone (T-PEZ), whose width is determined by the distance from the edge of field traveled by overland sheet flow and whose depth is determined by the plant root zone. Within the T-PEZ, exposure is estimated separately for loading of pesticide entrained in runoff and sorbed to eroded sediment, and pesticide deposited directly onto foliage by spray drift. For areas outside of the T-PEZ, exposure is estimated for pesticide transported via spray drift only. A separate wetland conceptual model in Audrey III is based on a conceptual Wetland Plant Exposure Zone (W-PEZ), the dimensions of which will be determined using analyses conducted as part of the National Wetland Condition Assessment. Similar to the T-PEZ, concentrations will be estimated based on loadings from from runoff, eroded sediment, and spray drift; however, the W-PEZ will be modeled as two completely mixed compartments (variable volume water column and benthos) linked together via mass-transfer. The aquatic exposure model is also based on pesticide loading from runoff, erosion, and spray drift to a relevant aquatic plant habitat.

1 - U.S. Environmental Protection Agency, Environmental Fate and Effects Division, Office of Pesticide Programs, 7507P, Washington, DC, 20460
2 - U.S. Environmental Protection Agency, Environmental Fate and Effects Division, Office of Pesticide Programs, Washington, DC, 20460
3 - U.S. Environmental Protection Agency, Environmental Fate and Effects Division, Office of Pesticide Programs, 1200 Pennsylvania Avenue, N.W., Washington, DC, 20460
4 - U.S. Environmental Protection Agency, Environmental Fate and Effects Division, Office of Pesticide Programs, 1200 Pennsylvania Avenue, N.W., Washington, DC, 20460, United States
5 - U.S. Environmental Protection Agency, Environmental Fate and Effects Division, Office of Pesticide Programs, 1200 Pennsylvania Avenue, N.W., Washington, VA, 20460
6 - U.S. Environmental Protection Agency, Environmental Fate and Effects Division, Office of Pesticide Programs, 1200 Pennsylvania Avenue, N.W. Mail Code 7101M, Washington, VA, 20460
7 - U.S. Environmental Protection Agency, Environmental Fate and Effects Division, Office of Pesticide Programs, 1200 Pennsylvania Avenue, N.W. Mail Code 7101M, Washington, DC, 20460

Keywords:
Pesticides
Ecotoxicology
Spray Drift
Plant Commmunties
Wetlands
Exposure Model.

Presentation Type: Poster
Session: P, Ecology Section Posters
Location: Exhibit Hall/Savannah International Trade and Convention Center
Date: Monday, August 1st, 2016
Time: 5:30 PM This poster will be presented at 6:15 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PEC002
Abstract ID:59
Candidate for Awards:None