# 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(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

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Source: https://www.legislation.gov.uk/nisr/1998/397/schedule/6/paragraph/2 (the official version)
Page: https://openlegislation.uk/surface-waters-dangerous-substances-classification-regulations-northern-ireland-1998/schedule-6/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.