XN000022-1996-11-20 — Page 54

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(a)

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The criteria adopted by the EPD in selecting the location of a sampling point for taking wastewater samples for enforcement of the WPCO are that the sample taken must be from the wastewater which is discharged to the sewers or waters; the location of such sampling point is set out in the discharge licence issued under section 14 of the WPCO. In determining the location of such sampling point, the Department will take into account practical requirements such as accessibility, convenience and minimal interference in the activities of the discharger. Section 29 of the WPCO provides that the licencee may appeal within 21 days of the issue of a licence if he is not satisfied with the sampling points identified in the licence.

(b) While combining wastewater streams into one discharge is not prohibited for discharge to sewers or waters, dilution of the discharge to achieve compliance with licence conditions is prohibited by the Technical Memorandum under the WPCO. If dilution occurs due to combination of wastewater streams, the wastewater streams will be controlled separately under the Ordinance. If the premises produces a wide range of different types of wastewater, the decision to control the combined wastewater streams as a single discharge will be taken on a case by case basis taking into account the prohibition against dilution.