A. Should measurements or other investigations reveal that the industrial discharger is discharging a flow rate or a quantity of flow showing chemical oxygen demand or suspended solids significantly in excess of that stated on the industrial wastewater permit or significantly in excess of the quantities reported to the city by the discharger and upon which the industrial wastewater treatment surcharge is based, the discharger shall apply for an amended industrial wastewater discharge permit and shall be assessed for all delinquent charges together with the penalty and interest provided for in Section 13.12.350. Before these charges shall be assessed, at least two additional twenty-four-hour samples and flow measurements shall be obtained, at least once per hour over the twenty-four-hour period, properly refrigerated, composited according to measured flow rates during the twenty-four hours and analyzed for the specified wastewater constituents, with all costs of sampling and analysis to be paid for by the discharger. Industrial plants with large fluctuations in quantity or quality of wastewater may be required to provide continuous sampling and analysis for every working day. When required by the superintendent, dischargers shall install and maintain in proper working order automatic flow-proportional, sampling equipment and/or automatic analysis and recording equipment.

B. For the purpose of establishing a correct treatment surcharge, the data obtained in these samplings, along with any other relevant information obtained by the city or presented by the discharger found in violation shall, in the absence of other evidence, be presumed to have been discharging at the determined parameter values over the preceding three years or subsequent to the previous city verification of quantity parameters, whichever period is shorter.

C. Measurements to verify the quantities of waste flows and waste constituents reported by industrial dischargers will be conducted on a random basis by personnel of the city. (Ord. 88-23 § 2, 1988; Ord. 142 § 411, 1976)