A. An industrial wastewater pretreatment system or device may be required by the superintendent to treat industrial flows prior to discharge to the sewer of certain waste constituents, to distribute more equally over a longer period any peak discharges of industrial wastewaters or to accomplish any pretreatment result required by the superintendent. All pretreatment systems or devices shall be approved by the superintendent, but such approval shall not absolve the industrial discharger of the responsibility of meeting any industrial effluent limitation required by the city. In special cases, the superintendent may require construction of sewer lines by the discharger to convey certain industrial wastes to a specific city trunk sewer. All pretreatment systems judged by the superintendent to require engineering design shall have plans prepared and signed by an engineer of suitable discipline licensed by the state of California.

B. Normally, a gravity-separation interceptor, equalizing tank, neutralization chamber and control manhole will be required, respectively, to remove prohibited settleable and floatable solids, to equalize, wastewater streams varying greatly in quantity and/or quality, to neutralize low-pH or high-pH flows and to facilitate inspection, flow measurement and sampling. Floor drains from commercial or manufacturing buildings, warehouses or multi-use structures shall not discharge directly to the sewer, but shall first discharge to a gravity-separation interceptor. (Ord. 142 § 408, 1976)