Rules for unusually strong industrial waste in sewers

(a) The County may accept into its public sewer system, an industrial waste of unusual volume, strength or character under a special agreement or arrangement between the County and the industrial concern, subject to payment of appropriate charges agreeable to both parties. The contributing person shall pay a proportionate share of the construction costs or sewer service charge based on the ratio of population equivalent to normal design population. (b) Where sewers, pumping stations, force main or outfall are to be provided, the population equivalent of the wastes shall be computed on the basis of the volume of the industrial wastes. Where primary treatment facilities are to be provided the population equivalent of the wastes shall be computed on the basis of the suspended solids of the industrial wastes. Where secondary treatment facilities are to be provided, the population equivalent of the wastes shall be related to the suspended solids as above or to the biochemical oxygen demand of the industrial wastes, whichever is greater. (c) Fats and greases shall not be discharged to the sewer system if their concentration and physical dispersion results in separation and adherence to sewer structures and appurtenances. If there is evidence of adherence of such materials to said structures, or if such materials cause blockage in the sewer system, then the wastewater carrying such materials must be effectively pretreated by a process or device to effect removal from the flow before its discharge to the sewer system. (d) Where preliminary treatment is deemed necessary by the director to render any water or wastes acceptable for discharge into the public sewage works, suitable preliminary treatment facilities shall be provided by the owner and maintained continuously in satisfactory and effective operation at his expense. In the maintaining of those interceptors, the owner shall be responsible for the proper removal and disposal by appropriate means of the captured materials and shall maintain records of the dates, amounts, and means of disposal which are subject to review by the director. Grease, oil, sand and dirt interceptors, screening devices, facilities for pH adjustment, and other necessary preliminary treatment facilities shall be of a type and capacity as approved by the director. (e) When the standards of the director for requiring pretreatment are less stringent than those promulgated by the U.S. Environmental Protection Agency, the standards of the U.S. Environmental Protection Agency will be those used for waste flows being discharged into wastewater treatment facilities.