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- 29 For risk assessment purposes some simulation days after the maximum soil concentration
are highlighted due to regular comparisons with eco-toxicity data. ESCAPE considers two
different lists of dates as summarised in Table 1. The times listed in this table are also the
base for all time weighted average concentrations calculated by ESCAPE (see the next
chapter). It is possible to change the lists by modifying the file “ESCAPE.ini”.
Table 1: Series of special times used by ESCAPE to calculate PECact and PECTWA
EU-regulation
BBA-regulation (Germany)
1d
30 d
2d
60 d
4d
90 d
7d
120 d
14 d
150 d
21 d
180 d
28 d
210 d
42 d
240 d
50 d
300 d
100 d
330 d
360 d
3.4.3. Time weighted average (TWA) concentrations
In addition to maximum soil concentrations also time weighted average concentrations
(PECTWA) are important endpoints for comparisons with results of eco-toxicity. ESCAPE uses
two different lists for the duration of time weighted average concentrations (see Table 1).
These type of concentrations are calculated based on a moving time frame assuring that
always the worst case PECTWA is found for a given time duration.
Generally, all time weighted average concentrations are calculated by ESCAPE within a twosteps-procedure:
In the first step the integral of actual soil concentrations (cumulative concentrations) for
parent compounds and metabolites is calculated according to equation (23).