1964_WATER_POLLUTION_CONTROL_(GENERAL)_REGULATIONS — Page 6

D6

CAP. 358]

Water Pollution Control (General) Regulations

[1988 Ed.

[Subsidiary]

(b) the total quantity of a component of an exempt discharge or deposit-

(i) in the case of industrial premises in which determinands are measured, by reference to the mean values for suspended solids, 5 day biochemical oxygen demand, chemical oxygen demand, oil and grease and heavy metals together with the quantities of raw materials notified in Form I in respect of that discharge or deposit;

(ii) in the case of industrial premises in which determinands are not measured, by reference to the quantities of raw materials notified in Form 1 in respect of that discharge or deposit;

(iii) in the case of a domestic sewage treatment plant, by reference to the mean values for 5 day biochemical oxygen demand and suspended solids notified in Form 2 in respect of that discharge or deposit;

(c) the rate per hour, per day or per month at which an exempt discharge or deposit is made or any component thereof is discharged or deposited, as the total quantity of the discharge, deposit or component over that period (as calculated under paragraph (a) or (b)) divided by the number of hours, days or months, as the case may be, in that period;

(d) the maximum temperature of an exempt discharge or deposit-

(i) in the case of industrial premises in which the temperature of the discharge or deposit is measured, as the maximum temperature notified in Form I in respect of that discharge or deposit;

(ii) in the case of a domestic sewage treatment plant, as the maximum temperature notified in Form 2 in respect of that discharge or deposit.

(2) In this regulation, "process losses" means water lost in evaporation during an industrial process plus water lost in the production of a product at industrial premises as estimated by the notifier in Form 1.

Method of measuring increases in quantities and

rates of exempt discharges and deposits

4. (1) For the purpose of ascertaining whether the quantity, rate or temperature of an exempt discharge or deposit or of any component thereof over any period subsequent to the First Appointed Day exceeds the quantity, rate or temperature calculated by the Authority under regulation 3 in relation to a corresponding period prior to the First Appointed Day, the Authority shall—

(a) take samples of the discharge or deposit from an approved sampling point;

(b) take at an approved sampling point any measurements of the discharge or deposit which can be so taken;

(c) measure the total quantity and resulting flow rate of the discharge or deposit or of any component thereof over a period of not less than 1 hour;