(A) The city shall determine each user’s average daily volume of wastewater, which has been 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 each user’s volume contribution percentage. The amount used as the total average daily volume of wastewater shall exclude infiltration and inflow. The city shall determine each user’s average daily poundage of five-day 20°C biochemical oxygen demand (BOD) which has been 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 each user’s BOD contribution percentage.
(B) The city shall determine each user’s average suspended solids (SS) poundage which has been discharged to the wastewater system which shall then be divided by the average daily poundage of all suspended solids discharged to the wastewater system, to determine the user’s suspended solids contribution percentage. Each user’s volume contribution percentage, BOD contribution percentage and suspended solids contribution percentage shall be multiplied by the annual operation and maintenance costs for wastewater treatment of the total volume flow, of the total five-day 20°C BOD and of the suspended solids, respectively.
(Prior Code, § 18-188) (Ord. 512, passed 9-20-1982)