# Surface Waters (Dangerous Substances) (Classification) Regulations (Northern Ireland) 1998, Paragraph 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 shall be satisfied in relation to the samples from each sampling point.
TABLE 9
(1)
(2)
Substance
Limit (in microgrammes per litre) (annual mean)
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
300
Bentazone
500
Benzene
30
Biphenyl
25
Chloronitrotoluenes
10
Demeton
0.5
Dimethoate
1
Linuron
2
Mecoprop
20
Naphthalene
5
Toluene
40
Triazaphos
0.005
Xylene
30

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Source: https://www.legislation.gov.uk/nisr/1998/397/schedule/7/paragraph/2 (the official version)
Page: https://openlegislation.uk/surface-waters-dangerous-substances-classification-regulations-northern-ireland-1998/schedule-7/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.