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The Surface Waters (Dangerous Substances) (Classification) (Scotland) Regulations 1998

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3.  In relation to dichlorvos used as a treatment for sea-lice infestation, compliance with the relevant limit in column (2) of Table 4 shall be determined by reference only to samples taken as nearly as maybe after 24 hours have elapsed since it was so used.

TABLE 3

(1)(2)
Dangerous substanceLimit (in microgrammes per litre) (annual mean)
Arsenic25
Atrazine and Simazine2 (for the 2 substances in total)
Azinphos-methyl0.01
Dichlorvos0.04
Endosulphan0.003
Fenitrothion0.01
Malathion0.02
Trifluralin0.1

TABLE 4

(1)(2)
Dangerous substanceLimit (in microgrammes per litre)
Dichlorvos0.6
Tributyltin0.002
Triphenyltin and its derivatives0.008

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