regulation 3(4)
1. Subject to paragraph 2, the criteria for the classification DS4 are that—
(a)the annual mean concentration of each substance listed in column (1) of Table 4 in samples taken from the sampling point for the waters in question in accordance with regulation 4 does not exceed the relevant limit shown in column (2) of that Table; and
(b)the concentration of each substance listed in column (1) of Table 5 in each sample so taken does not exceed the relevant limit shown in column (2) of that Table.
2. Where samples are taken in accordance with regulation 4 from more than one sampling point in relation to the waters in question, the criterion in paragraph 1(a) shall be satisfied in relation to the samples from each sampling point.
| (1) | (2) |
|---|---|
| Substance | Limit (in microgrammes per litre) (annual mean) |
| Arsenic | 50 |
| Atrazine and Simazine | 2 (for the two substances in total) |
| Azinphos-methyl | 0.01 |
| Dichlorvos | 0.001 |
| Endosulphan | 0.003 |
| Fenitrothion | 0.01 |
| Malathion | 0.01 |
| Trifluralin | 0.1 |
| (1) | (2) |
|---|---|
| Substance | Limit (in microgrammes per litre) |
| Triphenyltin and its derivatives | 0.02 |
| Tributyltin | 0.02 |