(A) In order that the rates and charges may be justly and equitably adjusted to the service rendered to industrial users, the city shall base its charges not only on volume, but also on the strength and character of industrial sewage and wastes it is required to treat and dispose of. The city shall require the owner or other industrial user to determine the strength and content of all sewage and wastes discharged, either directly or indirectly, into the sanitary sewage system, in such a manner and by such a method as the city may deem practicable in light of the conditions and attending circumstances of the case, in order to determine the proper charge. The owner or other industrial user shall furnish a central sampling point available to the city at all times.
(B) Normal sewage domestic waste strength should not exceed a biochemical oxygen demand of 300 milligrams per liter of fluid, suspended solids in excess of 250 milligrams per liter of fluid, and total ammonia nitrogen in excess of 30 milligrams per liter. Additional charges for treating industrial waste that is stronger than normal domestic waste shall be made on the following basis:
(1) Rate surcharge based upon BOD. There shall be an additional charge of $0.20 per pound of biochemical oxygen demand in excess of 300 milligrams per liter of fluid.
(2) Rite surcharge based upon suspended solids. There shall be an additional charge of $0.20 per pound of suspended solids in excess of 250 milligrams per liter of fluid.
(3) Rate surcharge based upon ammonia nitrogen (NH3N). There shall be an additional charge of $0.70 per pound of ammonia nitrogen (NH3N) received in excess of 30 milligrams per liter of fluid.
(4) Determination of strength by samplings and analysis. To determine the strength of the sewage and wastes, samplings and analysis shall be made from time to time, whenever it is deemed advisable by the city. After charges have been established, based upon the strength of sewage and wastes, the owner may request reconsideration of these charges by the city, by submitting analysis of composite samples of the sewage and wastes subject to the charges, certified by a registered engineer or qualified graduate chemist. The city may then adjust the charges to the ordinance rates required by the analysis, or may recheck the findings by additional samplings and analysis.
(5) Guidelines and procedures to follow in the determination. The determination of suspended solids, five-day biochemical oxygen demand and ammonia nitrogen (NH3N) contained in the waste shall be made in accordance with the latest copy of Standard Methods for the Examination of Water, Sewage and Industrial Wastes, as written by the American Public Health Association, the American Water Works Association, and the Water Pollution Control Federation, and in conformance with Guidelines Establishing Test Procedures for Analysis of Pollutants, CFR pt. 136, published in the Federal Register on October 16, 1973.
(`90 Code, § 13.12.100) (Ord. 690, passed - -; Am. Ord. 969, passed - -; Am. Ord. 93-28, passed--; Am. Ord. 95-18, passed - -; Am. Ord. 2004-18, passed 5-20-2004)