Occurrence patterns tiers

Overview

Table 73 Tier overview for module Occurrence patterns.
Name EC 2018 Tier 1 EC 2018 Tier 2

Apply occurrence pattern percentages

false

true

Substance conversion method

UseMostToxic

DrawRandom

Retain all allocated substances after active substance allocation

true

true

Account for substance authorisations in substance conversions

false

true

Use extrapolation rules

true

true

Threshold for extrapolation

10

10

Restrict extrapolations to equal MRLs

true

true

Restrict extrapolations to authorised uses

true

true

Impute water concentrations

true

true

Water concentration value (µg/kg)

0.1

0.05

Restrict water imputation to the five most toxic substances

true

true

Restrict water imputation to authorised uses

false

false

Scale up use frequency to 100%

true

Restrict use percentage up-scaling to authorised uses

true

EC 2018 Tier 1

Table 74 Tier definition for EC 2018 Tier 1.
Name Setting From input tier In module
Apply occurrence pattern percentages false
Substance conversion method UseMostToxic EC 2018 Tier 1 Concentrations
Retain all allocated substances after active substance allocation true EC 2018 Tier 1 Concentrations
Account for substance authorisations in substance conversions false EC 2018 Tier 1 Concentrations
Use extrapolation rules true EC 2018 Tier 1 Concentrations
Threshold for extrapolation 10 EC 2018 Tier 1 Concentrations
Restrict extrapolations to equal MRLs true EC 2018 Tier 1 Concentrations
Restrict extrapolations to authorised uses true EC 2018 Tier 1 Concentrations
Impute water concentrations true EC 2018 Tier 1 Concentrations
Water concentration value (µg/kg) 0.1 EC 2018 Tier 1 Concentrations
Restrict water imputation to the five most toxic substances true EC 2018 Tier 1 Concentrations
Restrict water imputation to authorised uses false EC 2018 Tier 1 Concentrations

EC 2018 Tier 2

Table 75 Tier definition for EC 2018 Tier 2.
Name Setting From input tier In module
Apply occurrence pattern percentages true
Scale up use frequency to 100% true
Restrict use percentage up-scaling to authorised uses true
Substance conversion method DrawRandom EC 2018 Tier 2 Concentrations
Retain all allocated substances after active substance allocation true EC 2018 Tier 2 Concentrations
Account for substance authorisations in substance conversions true EC 2018 Tier 2 Concentrations
Use extrapolation rules true EC 2018 Tier 2 Concentrations
Threshold for extrapolation 10 EC 2018 Tier 2 Concentrations
Restrict extrapolations to equal MRLs true EC 2018 Tier 2 Concentrations
Restrict extrapolations to authorised uses true EC 2018 Tier 2 Concentrations
Impute water concentrations true EC 2018 Tier 2 Concentrations
Water concentration value (µg/kg) 0.05 EC 2018 Tier 2 Concentrations
Restrict water imputation to the five most toxic substances true EC 2018 Tier 2 Concentrations
Restrict water imputation to authorised uses false EC 2018 Tier 2 Concentrations