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A well tested simulation model was used to evaluate the exceedance of the threshold value at different time aggregation levels, ranging from one day till 30 yr.
Coastal segments could be considered impaired if a ChlRS- a assessment was identified as a statistically significant exceedance of the criteria value for either the medians or 75th percentiles.
Of all physico-chemical parameters, turbidity and nitrite showed the highest exceedance of the threshold values set by ISIRI, followed by phosphate and ammonium.
A first conclusion from the radioactive mapping activity of Tauw [19, 20] should have been that with a more than 100-fold exceedance of the upper threshold value for dioxin at 20 ng TEQ/kg, a sufficient initial suspicion was given for undertaking further actions.
Exceedances of the RAC value occurred mainly in small to medium surface waters in Switzerland (Fig. 2).
Fig. 1 Exceedances of the RAC value as percentage of all measurements and measurements in FLOZ 1 3 per pesticide.
Due to the classification system of surface waters in Switzerland, it became obvious that exceedances of the RAC value occurred in small to medium surface waters.
Analysis of the Swiss monitoring data shows that exceedances of the RAC value were determined when MECmax was used for comparison.
The exceedance probability of the limiting value depends on the type of probability distribution and the variation coefficient V.
If the annual extremes follow the Gumbel distribution, the annual exceedance probability of the limiting value is about 1/1000 for V = 0.5 and 1/500 for V = 1.
The exceedance of these screening values indicates the need for additional assessment and for continued monitoring and control, together with evaluation of possible interim and long-term remediation options.
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