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 the volume, but also on strength and character of its stronger-than-normal domestic sewage and wastes which it is required to treat and dispose of. The city shall require the industrial user to determine the strength and content of all sewage and wastes discharged, either directly or indirectly in to the sanitary sewage system, in such manner and by such method as the city may deem practicable in the light of the conditions and attending circumstances of the case, in order to determine the proper charge. The industrial user shall furnish a central sampling point available to the city at all times.
(A) Normal sewage domestic waste strength should not exceed a biochemical oxygen demand of 220 milligrams per liter of fluid, suspended solids in excess of 230 milligrams per liter of fluid, phosphorus in excess of 10 milligrams per liter of fluid, and ammonia in excess of 18 milligrams per liter of fluid. Additional charges for treating stronger-than-normal domestic waste shall be made on the following basis:
(1) Rate Surcharge Based Upon Suspended Solids. There shall be an additional charge of $.19 per pound for suspended solids received in excess of 230 milligrams per liter of fluid.
(2) Rate Surcharge Based Upon BOD. There shall be an additional charge of $.20 per pound of biochemical oxygen demand for BOD received in excess of 220 milligrams per liter of fluid.
(3) Rate Surcharge Based Upon Phosphorus. There shall be an additional charge of $.72 per pound for phosphorus received in excess of 10 milligrams per liter of fluid.
(4) Rate Surcharge Based Upon Ammonia. There shall be an additional charge of $.71 per pound of ammonia received in excess of 18 milligrams per liter of fluid.
(B) The determination of Suspended Solids and a Five-day Biochemical Oxygen Demand contained in the waste shall be 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, the Water Pollution Control Federation, and in conformance with “Guidelines Establishing Test Procedures for Analysis of Pollutants,” Regulation CFR Part 136, published in the Federal Register on October 16, 1973.
(Ord. 98-7, passed 3-2-98)