No discharge of the following materials shall be made into the sanitary sewers beyond the limits or conditions hereafter stipulated, or to be established by the Director of Public Works. No discharge may be made of petroleum oil, non-biodegradable cutting oil, or products of mineral oil origin in amounts that will cause interference or pass-through. These materials shall be limited on analysis to the concentration set by the wastewater discharge permit. Where oils or greases, including those of animal and vegetable origin, are of the nature that they will solidify at temperatures of normal sewage and it is probable that they will collect in the sewer lines and contribute to clogging or, if non-petroleum oils and greases, can overload skimming and grease handling equipment or interfere with the treatment process, restrictions on discharge concentrations may be required. “Garbage” means solid waste:from domestic and commercial preparation, cooking, and dispensing of food; and from the handling, storage, and sale of food products. No discharge may be made of any garbage that has not been properly comminuted or shredded, as determined by the Director of Public Works. “pH” means the logarithm of the reciprocal of the hydrogen ion concentration of a solution. It indicates the intensity of acidity and alkalinity on a scale running from 0 to 14. A pH of 7.0 represents neutrality, values above 7.0 alkalinity, and below 7.0 acidity. No discharge may be made of acids or alkalies:having pH values, upon dilution in the immediate public sewer, lower than 6.0 or higher than 12.0; or which would in any way attack or corrode sewers or waste treatment equipment. At no time shall the pH measured at the point of discharge be less than 5.0. Where concrete sewers without special protection are involved, a more neutral discharge may be required. No discharge may be made of any wastewater containing toxic pollutants in sufficient quantity which, either alone or by interaction with other pollutants:injure or interfere with any wastewater treatment process; constitute a hazard to humans or animals; create a toxic effect in the receiving waters of the system; or cause the system to violate:its national pollutant discharge elimination system permit or the state disposal system permit or both; or the receiving water quality standards. No discharge may be made of any substance which may:cause the treatment plant’s effluent or any other product of the treatment plant to be unsuitable for reclamation and reuse; or interfere with reclamation process where the system is pursuing a reuse and reclamation program. No discharge may be made of concentrated dye waste or other wastes high in color which are sufficiently strong to affect the color of the treatment plant effluent. No discharge may be made of any wastes requiring an excessive quantity of chlorine or other chemical compound used for disinfection purposes or for neutralizing said wastes. No discharge may be made of any excessive amounts of :deionized water; steam condensate; distilled water; or single pass cooling water. “Excess amounts” will be determined by the hydraulic loading on the sewer and POTW and the ability of each to handle the discharge. No discharge may be made of any trucked or hauled pollutants, except at discharge points designated by the POTW. City Code, 1976/83, art. 25, §1(i), (r), §6(a)(3) Ord. 75-914 Ord. 84-129 Ord. 91-775