(a) Nothing contained in this chapter shall be deemed to prohibit a special agreement or arrangement between the City and an industrial concern whereby an industrial waste of unusual strength or character may be accepted by the City for treatment, subject to payment therefor by the industrial concern.
(b) Where the strength of sewage from an industrial, commercial or institutional establishment exceeds 250 parts per million, by weight, of BOD, or 250 parts per million, by weight, of suspended solids, or has a chlorine demand greater than 5 parts per million, by weight, an ammonia-nitrogen content greater than 40 parts per million, by weight, or a total phosphorous content greater that 4.5 parts per million, by weight, and where such wastes are permitted to be discharged to the sewer system by the Superintendent, an added charge, as provided for in subsection (c) hereof, shall be made against such establishment according to the strength of such wastes, which wastes shall in no event exceed 862 parts per million, by weight, of BOD, or 1,000 parts per million, by weight, of suspended solids, or have a chlorine demand greater than 15 parts per million, by weight, an ammonia-nitrogen content greater than 60 parts per million, by weight, a pH content less than 5.0 S.U. or greater than 11.0 S.U., or a phosphorous content greater than 5.8 parts per million, by weight. No industrial, commercial or institutional waste which exceeds the limits set forth in the preceding sentence shall be discharged. The strength of such wastes shall be determined by composite samples taken over a sufficient period of time to ensure a representative sample. The cost of sampling and testing shall be borne by the establishment, whether owner or lessee.
(c) In the event that the upper limits for BOD, suspended solids, ammonia-nitrogen or phosphorous, as specified in subsection (b) hereof, are exceeded, the City shall require that such sewage be treated by the establishment responsible therefor before being emptied into the sewer, or the right to empty such sewage shall be denied, if necessary to protect the system or any part thereof. Further, an additional charge in the form of a surcharge shall be made over and above the regular rates for those loading in excess of the specific pollutant limits set forth in subsection (b) hereof. The surcharge shall be calculated annually, based upon a percentage of the annual costs of operation and maintenance, including administration, attributable to treating a substance in excess of that of domestic sewage, which costs shall be divided by the influent pounds per day of the BOD, suspended solids, ammonia-nitrogen and phosphorous. The surcharge shall be set on an annual basis by Council resolution.
(Ord. 656. Passed 9-15-97; Ord. 829. Passed 11-9-09; Ord. 835. Passed 5-10-10.)