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The Urban Waste Water Treatment Regulations (Northern Ireland) 1995

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4.  The treated waste water shall be assumed to conform to the relevant parameters if, for each relevant parameter considered individually, samples of the water show that it complies with the relevant parametric value in the following way—

(a)for the parameters specified in Table 1 and sub-paragraph (b) of regulation 5(7), a maximum number of samples which are allowed to fail the requirements, expressed in concentrations and/or percentage reductions in that Table and that sub-paragraph, is specified in Table 3;

(b)for the parameters of Table 1 expressed in concentrations, the failing samples taken under normal operating conditions must not deviate from the parametric values by more than 100%;

(c)for those parameters specified in Table 2 the annual mean of the samples for each parameter shall conform to the relevant parametric values.

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