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 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 user to determine the strength and content of all sewage and wastes discharged, either directly or indirectly into the sanitary sewage system, in the manner, by the method and at times as the city may deem practicable in light of the conditions and attending circumstances of the case, in order to determine the proper change. The 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 200 mg/l of fluid, suspended solids in excess of 200 mg/l of fluid, or phosphorus in excess of 15 mg/l 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 $0.22 per pound of suspended solids for suspended solids received in excess of 200 mg/l of fluid.
(2) Rate surcharge based upon BOD. There shall be an additional charge of $0.17 per pound of biochemical oxygen demand for BOD received in excess of 200 mg/l of fluid.
(3) Rate surcharge based upon phosphorus. There shall be an additional charge of $3.02 per pound of phosphorus received in excess of 15 mg/l of fluid.
(B) The determination of suspended solids, biochemical oxygen demand and phosphorus contained in the waste shall be in accordance with the latest copy of Standard Methods for the Elimination 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 accordance with “Guidelines Establishing Test Procedures for Analysis of Pollutants,” 40 CFR part 136.
(Ord. 579, passed 5-27-08; Am. Ord. 653, passed 6-23-14)