Surface Waters (Dangerous Substances) (Classification) Regulations (Northern Ireland) 1998

regulation 3(6)

SCHEDULE 6 Criteria for Classification DS6

1.  Subject to paragraph 2, the criteria for the classification DS6 are that—

(a) the annual mean concentration of each substance listed in column (1) of Table 8 in samples taken from the sampling point for the waters in question in accordance with regulation 4 does not exceed the relevant concentration specified in column (2) of that Table; and

(b) the concentration of mevinphos in each sample so taken does not exceed 0.02 microgrammes per litre.

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.

TABLE 8

(1)	(2)
Substance	Annual mean concentration in microgrammes per litre
4-Chloro-3-methyl-phenol	40
2-Chlorophenol	50
2,4-Dichlorophenol	20
2,4-D (ester)	1
(non-ester)	40
1,1,1-Trichloroethane	100
1,1,2-Trichloroethane	400
Bentazone	500
Benzene	30
Biphenyl	25
Chloronitrotoluenes	10
Demeton	0.5
Dimethoate	1
Linuron	2
Mecoprop	20
Naphthalene	10
Omethoate	0.01
Toluene	50
Triazaphos	0.005
Xylene	30