(A) The city, or its Utility Manager, shall determine for each user or user class the average daily volume of wastewater discharged to the wastewater system, which shall then be divided by the average daily volume of all wastewater discharged to the wastewater system to determine such user’s volume contribution percentage. The amount used as the total average daily volume of wastewater shall exclude infiltration and inflow. The city, or its Utility Manager, shall determine for each user or user class the average daily poundage of five-day 20°C biochemical oxygen demand (BOD) discharged to the wastewater system which shall then be divided by the average daily poundage of all five-day BOD discharged to the wastewater system to determine such user’s BOD contribution percentage.
(B) The city, or its Utility Manager, shall determine for each user or user class the average daily total suspended solids (TSS) poundage discharged to the wastewater system, which shall then be divided by the average daily poundage of all TSS discharged to the wastewater system, to determine such user’s TSS contribution percentage. The volume contribution percentage, BOD contribution percentage and TSS contribution percentage for each user or user class shall be multiplied by the annual operation and maintenance costs for wastewater treatment of the total volume flow, total five-day 20°C BOD and total TSS, respectively.
(Ord. 209, passed - -)