(A) In order that the rates and charges may be justly and equitably adjusted to the service rendered to users, the city shall base its charges not only on the volume, but also on the strength and character of the stronger-than-normal domestic sewage, and shall require the user to determine the strength and content of all sewage and wastes discharged, either directly or indirectly into the 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 user shall furnish a sampling point, as defined in the sewer use ordinance, available to the city at all times.
(B) Normal sewage domestic waste strength should not exceed a biochemical oxygen demand of 250 milligrams per liter of fluid or suspended solids in excess of 250milligrams per liter of fluid or phosphorous in excess of 4 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 $0.10 per pound of suspended solids for suspended solids received in excess of 250 milligrams per liter of fluid.
(2) Rate surcharge based upon B.O.D. There shall be an additional charge of $0.17 per pound of biochemical oxygen demand for B.O.D. received in excess of 250 milligrams per liter of fluid.
(3) Rate surcharge based upon phosphorous. There shall be an additional charge of $1.76 per pound of phosphorous received in excess of four (4) milligrams per liter of fluid up to 6.99 milligrams per liter of fluid. There shall be an additional charge of $10.11 per pound of phosphorous received in excess of 7 milligrams per liter of fluid.
(C) The determination of suspended solids, Phosphorus, and five-day biochemical oxygen demand contained in the waste shall be in accordance with the current edition 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 Environment Federation.
(Ord. 1589, passed - - ; Am. Ord. 64A-8-89, passed 8-28-89; Am. Ord. 17-07-20, passed 7-28-20)