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have a temperature exceeding l04EF (40EC), or having heat in amounts which will inhibit biological activity in the wastewater treatment works resulting in interference therein; (f) Any noxious or malodorous liquids, gases or solids which either singly or by interaction with other wastes are capable of creating a public nuisance or hazard to life, or are sufficient to prevent entry into the sewers for their maintenance and repair; and/or (g) Any wastewater with objectionable color not removed in the treatment process, such as, but not limited to, dye wastes and vegetable tanning solutions. (4) Metro sewer standards. All discharges must be in accordance with the Metro Sewer Board Booklet "Sewage and Waste Control Rules and Regulations for Metro Disposal System." (5) Dilution. It is unlawful for any user to increase the use of process water or, in any manner, attempt to dilute a discharge as a partial or complete substitute for adequate treatment to achieve compliance with the limitations contained in this division (C), or contained in the National Categorical Pretreatment Standards or any state requirements. (6) Special provisions relating to unusual wastes. If any waters or wastes are discharged or are proposed to be discharged to the public sewers which contain substances or possess the characteristics enumerated in this division (C), and/or which in the judgment of the city, may have a deleterious effect upon the wastewater facilities, or which otherwise create a hazard to life or constitute a public nuisance, the city may: (a) Reject the wastes; (b) Require pretreatment to an acceptable condition for discharge to the public sewers, pursuant to ~ 307(b) ofthe Act and all addendums thereof; (c) Require control over the quantities and rates of discharge; (d) Require protection from slug or accidental discharges; and/or ( e) Require payment to cover the added costs of handling, treating and disposing of wastes not covered by existing taxes or sewer service charges. (7) Grease, oil and sand interceptors. Grease, oil and sand interceptors shall be provided when, in the opinion of the city, they are necessary for the proper handling of liquid wastes containing floatable grease in excessive amounts, any flammable wastes, sand or other harmful ingredients; except that the interceptors shall not be required for private living quarters or dwelling units. All interceptors shall be of the type to be readily and easily accessible for cleaning and inspection.