A person discharging wastes into the city wastewater system with a daily total in excess of 750 pounds or more of either BOD or suspended solids shall, at the option of the City Engineer, be required within six months after notification, to construct and maintain approved automatic flow measurements, sampling, and sample storage facilities for all waste entering the wastewater system. These facilities shall, when required by the City Engineer, be used to obtain flow, BOD, FOG and suspended solids data for use as a basis for industrial wastewater service charges.