(A)   The sewer service charges established in this code shall not prevent the assessment of additional charges to users who discharge extra strength waste or wastes of unusual character, or contractual agreements with users, as long as the following conditions are met.
      (1)   The user pays OM&R costs in proportion to the user’s proportionate contribution of wastewater flows and loadings to the treatment works and no user is charged at a rate less than that of domestic strength waste.
      (2)   The measurement of wastes are conducted according to the latest edition of Standard Methods for the Examination of Water and Wastewater in a manner acceptable to the city as provided for in this code.
   (B)   A study of unit costs of collection and treatment processes attributable to fixed service, flow BOD5, TSS, and other significant loadings shall be developed for determining the proportionate allocating of costs to fixed service, flows, and loadings for users discharging extra-strength wastes or wastes of unusual character.
(Prior Code Ch. 50, § 16)