By G. Thomas

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The £10 billion programme does not include the cost of remedial measures for much of the PAH, pesticide or lead problems. Table V: Summary of water supply investment 1990—2000. (November 1989 prices). 10 CONCLUSIONS The quality and monitoring of water supplies in England and Wales is now specified by water quality regulations, which incorporate the standards of the EC Drinking Water directive and some additional standards, and specify the frequency of sampling and analysis. Supplies are required to meet the majority of these standards for every sample examined.

The standards can then be used to derive consents for individual discharges, taking into account the dilution in the receiving water, but also the concentration of the substance already present in the receiving water from other sources. The EQO approach can deal with diffuse inputs and 46 WATER TREATMENT can be used to control multiple point sources. It also makes proper use of the receiving water capacity. The common uses of both fresh and saline waters have been defined (Mance 1984), taking into account the use-related directives adopted by the EC (eg the Abstraction to Drinking Water Directive (CEC 1975) and the Freshwater Fish Directive (CEC 1978), Table 1.

Table I: Additional standards for water for domestic purposes. 34 WATER TREATMENT Some of the descriptive standards in the EC directive have been excluded from the Water Quality Regulations. Dissolved oxygen is not considered meaningful for routine measurement and free carbon dioxide is not meaningful for water at the tap (Miller, 1990). The standard for hydrogen sulphide (“undetectable organoleptically” ) is considered to be included in the taste and odour parameters. These standards apply to water samples taken from taps in the distribution system, but the same microbiological standards are prescribed for water leaving treatment works and in service reservoirs.

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