In order that the rates and charges may be justly and equitably adjusted to the service rendered to the industrial users, the city shall base its charges not only on the volume, but also on strength and character of the 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 into 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 three hundred forty-four milligrams per liter of fluid, suspended solids in excess of two hundred forty-eight milligrams per liter of fluid, phosphorus in excess of eleven milligrams per liter of fluid or NH ₃-N in excess of twenty-seven 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 $.076 per pound for suspended solids received in excess of two hundred forty-eight milligrams per liter of fluid.

    2.    Rate Surcharge Based Upon BOD. There shall be an additional charge of $.063 per pound of biochemical oxygen demand for BOD received in excess of three hundred forty-four milligrams per liter of fluid.

    3.    Rate Surcharge Based Upon Phosphorus. There shall be an additional charge of $.726 per pound of phosphorus received in excess of eleven milligrams per liter of fluid.

    4.    Rate Surcharge Based Upon NH ₃-N. There shall be an additional charge of $.233 per pound of NH₃-N received in excess of twenty-seven milligrams per liter of fluid.

    5.    Special Rate Zone. Those single-family domestic users that receive sanitary sewer service by the city and reside outside the limits of the city and within the property described as the Royalview Subdivision Sections I and II as recorded in Plat Book "F" page 96 and Plat Book "K" page 59 respectively shall be subject to an interim service charge of twenty-four dollars per household per month.

    B.    The determination of suspended solids and 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. 98-25 § 3, 1998; Ord. 92-24 § 3, 1992; prior code § 26-100)