A. An industrial wastewater pretreatment system or device may be required by the city engineer to treat industrial flows prior to discharge to the sewer when it is necessary to restrict or prevent the discharge to the sewer of certain waste constituents, to distribute more equally over a longer time period any peak discharges of industrial wastewaters or to accomplish any pretreatment result required by the city engineer. All pretreatment systems or devices shall be approved by the city engineer but such approval shall not absolve the industrial discharger of the responsibility for meeting any industrial effluent limitation required by the city including all applicable federal, state and local limitations and requirements. In special cases, the city engineer 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 city engineer to require engineering design shall have plans prepared and signed by an engineer of suitable discipline licensed in the state. In no case shall an industrial waste discharger be absolved of the responsibility of complying with applicable industrial waste discharge standards or requirements established by the state or local government or established by the federal government pursuant to Section 307 of the Clean Water Act, as amended or the federal pretreatment regulations promulgated pursuant to Section 307. This includes both existing standards or requirements and any standards or requirements which may be enacted or promulgated by the federal, state, or local government.

B. Normally a gravity separation interceptor, equalizing tank, neutralization chamber, control manhole or other monitoring facility, and a spill containment system, 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 or high pH flows, to facilitate inspection, flow measurement and sampling, and to prevent discharge to the sewer of quantities of toxic materials due to rupture of a tank or pipeline or other such accidental occurrences. Spill containment systems shall conform to requirements established by the city engineer and shall in no event be dependent upon electrical or other energy. No industrial waste discharger shall operate a spill containment system that allows incompatible liquids to mix thereby creating hazardous or toxic substances in the event of the failure of more than one container. 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. 4740 § 1, 2013; Ord. 3667 § 1, 1995)