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Synthetic pyrethroid insecticides have generated public concerns due to their increasing use and potential effects on aquatic ecosystems. A modeling system was developed in this study for simulating the transport processes and associated sediment toxicity of pyrethroids at coupled field/watershed scales. The model was tested in the Orestimba Creek(More)
OVERVIEW A major goal of the California Department of Pesticide Regulation's (CDPR) Surface Water Protection Program (SWPP) is to characterize pesticide residues in surface water for both agricultural and urban areas of the state. This is done primarily through surface water monitoring to assess pesticide concentrations for high priority chemicals and their(More)
Pesticide runoff from impervious surfaces is a significant cause of aquatic contamination and ecologic toxicity in urban waterways. Effective mitigation requires better understanding and prediction of off-site transport processes. Presented here is a comprehensive study on pesticide washoff from concrete surfaces, including washoff tests, experimental data(More)
This paper presents a framework for cumulative risk characterization of human exposure to pesticides through multiple exposure pathways. This framework is illustrated through a case study of selected organophosphate (OP) pesticides in the northern San Joaquin Valley of California. Chemical concentrations in environmental media were simulated using a(More)
1 Disclaimers  The model evaluation is based on the latest version of the models at the time of this study (RICEWQ v1.73, PCPF v3.01, and PFAM v0.5) available at the time of study. All models, including executable files and/or source codes, were obtained from the model developers. The results of model evaluation in this study may not be appropriate for the(More)
Agricultural pollutant runoff is a major source of water contamination in California's Sacramento River watershed where 8500 km 2 of agricultural land influences water quality. The Soil and Water Assessment Tool (SWAT) hydrology, sediment, nitrate and pesticide transport components were assessed for the Sacramento River watershed. To represent flood(More)