1. Subject to paragraph 2, the criteria for the classification DS5 are that—
(a)the annual mean concentration of each substance listed in column (1) of Table 6 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)subject to paragraph 3, the concentration of each substance listed in column (1) of Table 7 in each sample so taken does not exceed the relevant limit shown in column (2) of that Table.