(11)

in Section 1.3.4, the fourth paragraph is replaced by the following: ‘Monitoring frequencies shall be adjusted, if necessary, to take account of the variability in parameters resulting from variation in both anthropogenic and natural conditions. The times at which monitoring is undertaken shall be selected so as to take account of the impact of seasonal variations in substance use or water levels on the monitoring results, and thus ensure that the results effectively reflect any changes in the water body caused by anthropogenic pressure and by climatic variation. As regards priority substances whose concentration is likely to peak over short periods as a result of seasonal fluctuations in their use, monitoring shall, during those peak periods, be carried out at intervals shorter than for other substances, where necessary, to ensure that adequate information is obtained on the concentration of those substances.’;

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Source: EUR-Lex (Cellar) · retrieved 2026-10-08 · Text as adopted (Official Journal); later amendments are not incorporated in this text.