A. Periodic measurements of flow rates, flow volumes, COD and suspended solids, for use in determining the annual industrial wastewater treatment surcharge, and such measurements of such other constituents believed necessary by the superintendent, shall be made by all industrial wastewater dischargers, unless specifically relieved of such obligation by the superintendent. All sampling, analysis and flow measurements of industrial wastewaters shall be performed by a state-certified independent laboratory, by a laboratory of an industrial discharger approved by the superintendent, or by personnel of the city. If performed by city personnel, an appropriate charge shall be paid by that discharger requesting the tests. Prior to submittal to the city of data developed in the laboratory of an industrial discharger, the results shall be verified by a responsible administrative official of the industrial discharger under the penalty of perjury.

B. All wastewater analysis shall be conducted in accordance with the appropriate procedure contained in Standard Methods. If no appropriate procedure is contained therein, the standard procedure of the industry or a procedure judged satisfactory by the superintendent shall be used to measure wastewater constituents. Any independent laboratory or discharger performing tests shall furnish any required data or information on the test methods or equipment used, if requested to do so by the superintendent.

C. All dischargers making periodic measurements shall furnish and install at the control manhole or other appropriate location a calibrated flume, weir, flow meter or similar device approved by the superintendent to measure the industrial wastewater flow rate and total volume. A flow-indicating, flow-recording and flow-totalizing register may be required by the superintendent.

D. The sampling, analysis and flow measurement procedures, equipment and results shall be subject at any time to inspection by the city. Sampling and flow-measurement facilities shall be such as to provide safe access to authorized personnel.

E. Those industrial wastewater dischargers required by the superintendent to make periodic measurements of industrial wastewater flows and constituents shall annually make the minimum number of such measurements required. The minimum requirement for such periodic measurements shall be at least one 24-hour measurement per year. Representative samples of the industrial wastewater 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. 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 order automatic flow-proportional sampling equipment and/or automatic analysis and recording equipment.

F. 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. 142 § 410, 1976)