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These Regulations prescribe the system of classifying the quality of inland waters, coastal waters and relevant territorial waters (as defined in section 103(1)(c) of the Water Act 1989) according to the presence in them of concentrations of the dangerous substances listed in the Schedules to the Regulations.
With two exceptions, the classifications DS1 (in relation to inland waters) and DS2 (in relation to coastal waters and relevant territorial waters) reflect the quality objectives specified in Annex II to Council Directive 82/176/EEC (OJ No. L81, 27.3.82, p.29) (mercury and its compounds), Annex II to Council Directive 83/513/EEC(OJ No. L291, 24.10.83, p.1) (cadmium and its compounds), Annex II to Council Directive 84/156/EEC (OJ No. L74, 17.3.84, p.49) (mercury and its compounds), Annex II to Council Directive 84/491/EEC (OJ No. L274, 17.10.84, p.11) (hexachlorocyclohexane), Annex II to Council Directive 86/280/EEC (OJ No. L181, 4.7.86, p.16) (carbon tetrachloride, DDT and pentachlorophenol) and Council Directive 88/347/EEC (OJ No. L158, 25.6.88, p.35) which amends the 1986 Directive by adding quality objectives for aldrin, dieldrin, endrin and isodrin, hexachlorobenzene, hexachlorobutadiene and chloroform. The exceptions relate to the quality objectives for concentrations of cadmium and mercury in classification DS2. The Directive specifies an annual mean of not more than 5 and 0·5 microgrammes per litre for cadmium and mercury respectively in esturial waters but the classification DS2 (which applies to estuarial waters) specifies a more stringent annual mean of not more than 2·5 and 0·3 microgrammes per litre.
The classifications are relevant for the purposes of setting water quality objectives for inland waters, coastal waters and relevant territorial waters under section 105 of the Water Act 1989. Regulation 4 modifies that section for the purpose of complying with Community obligations arising by virtue of Council Directive 76/464/EEC by relieving the Secretary of State of the requirements to give at least three months' notice before establishing initial water quality objectives giving effect to that and other Directives relating to discharges of dangerous substances, and to consider representations or objections to his proposals to establish those objectives.
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