(A) The basic user charge for the combined system shall be based on water usage as recorded by water meters and/or sewage meters for wastes. The basic user charge shall be used for wastewater having normal concentrations as determined by the North Shore Sanitary District.
(B) The basic user charge shall consist of operation and maintenance costs, plus replacement, and shall be computed as follows:
(1) Estimate the projected annual revenue required to operate and maintain the wastewater facilities, including a replacement fund for the year, for all works categories.
(2) Establish the proportion of estimated costs to wastewater facility categories by volume, suspended solids, and BOD, if possible.
(3) Estimate wastewater volume, pounds of suspended solids, and pounds of BOD to be treated.
(4) Establish the proportion of estimated costs to non-industrial and industrial users by volume, suspended solids, and BOD.
(5) Compute costs per 1,000 gallons for normal sewage strength.
(6) Compute surcharge costs per 1,000 gallons per mg/1 in excess of normal sewage
strength for BOD and suspended solids.
('79 Code, § 1103) (Ord. 1983-O-5, passed 4-19-83)