A tiered-assessment scheme for the exposure assessment of aquatic organisms in Dutch surface waters: Upwards and sideways spraying

Research output: Book/ReportReportProfessional

Abstract

n this report, we propose a tiered approach for the exposure assessment of aquatic organisms in Dutch surface waters. The tiered approach has been developed for upwards and sideways spraying techniques. The tiered approach consists of three tiers and a pre-assessment tier. In anticipation of the acceptance of the repaired FOCUS surface water scenarios in the risk assessment of active substances by the EU, the (repaired) FOCUS surface water scenario (FOCUS SW D3) is used in Tier-1. Currently, a decision on the temporal percentile to be used in the risk assessment still needs to be taken by the European Commission. Once this decision is taken and the software tools are accepted, we expect that the repaired FOCUS surface water scenarios will be adopted for use in the EU risk assessment. The concentrations calculated for the selected scenario (FOCUS SW D3) can then be used in the Dutch procedure. To guarantee consistency of the tiered approach, an assessment factor of 1.2 is proposed for Tier-1 simulations when performing an exposure assessment for surface water adjacent to large fruit crops. For avenue trees and for small fruit, an assessment factor is not necessary. The tiered approach proposed in this report is only valid for surface water concentrations and for spray applications.
Original languageEnglish
Place of PublicationWageningen
PublisherWageningen Environmental Research
Number of pages45
ISBN (Electronic)9789464470086
DOIs
Publication statusPublished - 2021

Publication series

NameReport / Wageningen Environmental Research
No.3125
ISSN (Print)1566-7197

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