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EUSES

Release module

Is it still possible to fill in the Elocal values?
Yes, it is still possible. However, in certain scenarios you may need to select the value for some parameters (to better define the scenario) before the Elocal field in the output tab becomes editable. For example, after selecting the scenario (1) Human hygiene, you still need to select a value for ‘use tonnage or consumption-based approach’ in order for the fields “local emission to wastewater” and “local emission to air” to become editable. Note also that in EUSES 2.2.0, default emission scenarios are provided which may be used to cover new uses.
Are direct releases calculated for the tonnage based scenarios?
The calculation of direct releases is only implemented for the consumption based approach. You can find more details on the 'Practical guide: How to use EUSES 2.2.0' (available on the EUSES webpage https://echa.europa.eu/support/dossier-submission-tools/euses ).
Where can I find the equations implemented in the release module in EUSES 2.2.0?
The calculations are implemented according to the respective ESD and agreements published in the TAB. However, for most of the product types you can find the equations in the Excel files published on the ECHA ESD webpage https://echa.europa.eu/en/guidance-documents/guidance-on-biocides-legislation/emission-scenario-documents . For PT 11 you can find the equations in the EUSES 2.1 model calculations III available through the EUSES webpage https://echa.europa.eu/support/dossier-submission-tools/euses.
SimpleTreat

Is SimpleTreat 4.0 implemented with the adaptations as discussed in the TAB?
The standalone version of SimpleTreat 4 is implemented in EUSES 2.2.0. For instance, the option between Municipal STP and Industrial STP was introduced because it is a functionality of the standalone version of SimpleTreat 4. However, the default operation mode of the STP was set to "Municipal", which is the default value for the environmental risk assessment of biocides. All the default values agreed for biocides and included in the TAB were implemented as default values in SimpleTreat 4 in EUSES. You find these default values described in the TAB v2.0, ENV 9 (Technical Agreements for Biocides - link on the webpage https://echa.europa.eu/en/guidance-documents/guidance-on-biocides-legislation/emission-scenario-documents).
Can I use SimpleTreat 3.1 for the environmental risk assessment of biocides?

There are two scenarios where using SimpleTreat 3.1 is no longer adequate:

1)  You must use SimpleTreat 4.0 for active substance CARs submitted to ECHA (and consecutive product authorisation after approval of the active substance) after July 2017 (more precisely after 25 July 2017, i.e. six months after the decision at WG-I-2017).

2) For product authorisation you must use SimpleTreat 4.0 for applications submitted after January 2019 (more precisely after 25 January 2019, i.e. two years after the WG decision) (see also the TAB v2.0, ENV 9 - link on the webpage https://echa.europa.eu/en/guidance-documents/guidance-on-biocides-legislation/emission-scenario-documents).

I come to different results for the STP output when using SimpleTreat 4.0 standalone compared to the version implemented in EUSES.
Small differences in the results may be due to the temperature conversion from Kelvin to Celsius. In EUSES 2.2.0 the temperature conversion makes use of the more precise value of 273.15 K instead of the value 273 K used in SimpleTreat 4.0 standalone.
Specific product types

In PT 8 scenarios, which equations are implemented for the calculation of the concentrations in soil after degradation?
The Excel file (see link in answer above) includes both the time weighted concentrations and the concentrations over each assessment period. In EUSES 2.2.0 the concentrations after removal are calculated at the end of the assessment periods (not time weighted concentrations).
Should I use the previous version of EUSES to calculate the releases from the use of insecticides and disinfectants used in stables?
The previous versions of EUSES should not be used for the calculation of PT3 and PT 18. Excel files to calculate the emissions from PT 18 and PT 3 scenarios not included in EUSES will be published on ECHA ESD page by the end of 2019. Until then, please use the equations provided in the ESD to estimate the emissions. The implementation of PT 18 stables and manure scenarios in previous EUSES is no longer up to date.
In the case of PT 18 products, often the product is sold in a concentrated formulation which needs to be diluted before its use. Which value do I need to enter in EUSES: the amount of concentrated product or the amount of product after its dilution?
You need to enter the quantity of commercial product, that is, before dilution.
Are the city scenario and the storm water scenario (direct emissions to surface water in urban areas) implemented in EUSES?
Yes, they are.  You can find more details on the direct releases to surface water via the rainwater sewer in PT 6, 7, 8, 9, 10 and 14 in the Section 5.2.2 of the 'Practical guide: How to use EUSES 2.2.0' (available on the EUSES webpage https://echa.europa.eu/support/dossier-submission-tools/euses).
In case of the PT 10 scenario, house in the countryside, how can I assess the emissions if I do not have leaching data?
When no leaching data is available it should be assumed 100 % leaching (of the applied amount) for TIME 3; 75 % for TIME 2; and 50 % for TIME 1. We assume the conclusions for PT 8, from the document “Summary: Conclusions of the 2nd EU Leaching Workshop on Wood Preservatives ENV 104,” can be applied to PT 10.
Substance properties

Do I still need to set the value of the Henry's Law constant?
You can provide experimental values together with the temperature at which it was measured. Otherwise EUSES will use the Henry's law constant at 25 °C which is automatically calculated. In this respect nothing has changed compared to the previous version of EUSES.
Why can't I use the vapour pressure and the water solubility values which I determined at a temperature different from 20/25 °C?
Those fields were removed since the equations implemented in EUSES to calculate VP / water solubility at 25 °C from a measured VP (at a given temperature) were only applicable within a narrow temperature range. On the other hand, the water solubility is usually determined at 20 °C and the VP is usually determined at 20 °C for volatile substances as well.
Can I use the measured DT50 values to overwrite the degradation rate constant or the total rate constant?
Output or default values can always be overwritten in EUSES; this also applies to degradation rates. Measured DT 50 values can be used to overwrite the degradation rate constant.
Under what circumstances would a DT50 affect the PEC water?
It affects the PEC in water only in cases of direct release (e.g. in PT 8 bridge over pond scenario).
Technical questions on EUSES

Will EUSES 2.2.0 be updated in case of changes to ESDs and TAB?
EUSES 2.2.0 reflects the agreements on exposure assessment in effect at the beginning of 2019. Any change to exposure scenarios will be included in a new ECHA tool which will merge CHESAR and EUSES and which will be developed over the coming years. Until the new tool is available, if different default values are agreed on, you need to overwrite them in EUSES. We will also update the Excel files on the ECHA ESD webpage in case of major changes in the scenarios (ECHA ESD webpage https://echa.europa.eu/en/guidance-documents/guidance-on-biocides-legislation/emission-scenario-documents).
Can I import a file from the previous version of EUSES?
Only a very limited part of the information will be imported into EUSES 2.2.0. You can find more details in Section 3.2 of the 'Practical guide: How to use EUSES 2.2.0' (available on the EUSES webpage https://echa.europa.eu/support/dossier-submission-tools/euses)

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