(A) (1) Users of the wastewater treatment works shall be identified as belonging to one of the following user classes:
(a) Residential;
(b) Commercial;
(c) Governmental;
(d) Institutional; or
(e) Industrial.
(2) The allocation of users to these categories for the purpose of assessing user charges and debt service charges shall be the responsibility of the City Clerk. Allocation of users to user classes shall be based on the substantive intent of the definitions of these classes contained herein.
(B) Each user shall pay operation, maintenance, and replacement costs in proportion to the user’s proportionate contribution of wastewater flows and loadings to the treatment plant, with the minimum rate for loadings of BOD and TSS being the rate established for concentrations of 125 mg/l BOD and 150 mg/l TSS (such as, normal domestic strength wastewater). Those industrial users discharging segregated normal domestic strength wastewater only can be classified as commercial users for the purpose of rate determination.
(C) The charges assessed residential users and those users of other classes discharging normal domestic strength wastewater shall be established proportionately according to billable wastewater volume. Billable wastewater volume shall be calculated as follows:
(1) Residential users: Billable wastewater volume for residential users shall be calculated on 100% of the metered wastewater usage throughout the year;
(2) Non-residential users: The billable wastewater volume of non-residential users will be calculated on 100% of the metered wastewater usage throughout the year or calculated on the basis of wastewater flow meters. The city may, at its discretion, require non-residential users to install such additional water meters or wastewater flow meters as may be necessary to determine billable wastewater volume.
(Ord. 7, 4th Series, eff. 1-1-1988; Ord. 22, 5th Series, eff. 11-26-1992)
(D) User charges for normal domestic users shall be determined as follows:
(1) Calculation of unit cost for treatment of normal domestic strength wastewater:
Uomr = Comr
Tbwv
Tbwv
Where Uomr = Unit cost for operation, maintenance and replacement in $/kgal.
Comr = Total annual OM & R costs.
Tbwv = Total annual billable wastewater volume in kgal.
(2) Calculation of user charge:
Uc = Uomr x bwv
Where: Uc = User charge
Uomr = Unit cost for operation, maintenance and replacement in $/kgal.
bwv = Billable wastewater volume of a particular user in kgal.
(E) Local construction costs of the wastewater treatment facility will be recovered through a debt service charge calculated using usage and connection charges as follows:
(1) Calculation of debt service unit cost for wastewater volume:
Uds = Cds
Tbwv
Tbwv
Where Uds = Unit cost for debt service in $/kgal.
*Cds = Cost of annual debt service assigned for wastewater volume.
Tbwv = Total annual billable wastewater volume in Kgal.
* City may reduce the cost of annual debt service through the use of other city funds at its discretion.
(2) Calculation of debt service billable connection cost:
UD = CDC
TC
TC
Where: UD = Unit billable connection cost for debt service
*CDC = Costs of annual debt service assigned for connections
Tc = Total number of billable connections
* City may reduce the cost of annual debt service through the use of other city funds at its discretion.
(3) Calculation of Debt Service Charge:
Dc = Uds x bw = UD x U
Where: Dc = Debt service charge
Uds = Unit cost for debt service in $/kgal
UD = Unit billable connection cost for debt service
U = Number of billable connections for particular user
bwv = Billable wastewater volume of a particular user in kgal.
(F) The sewer service charge for a particular connection shall be determined as follows:
SSC = Uc + Dc
Where: SSC = Sewer Service Charge
Uc = User charge
Dc = Debt service charge
(G) An additional fee will be charged for wastewater collection system maintenance or replacement of necessary collection system lines. This charge will be added to the SSC and determined annually by the Council.
(H) The sewer service charges established in this subchapter shall not prevent the assessment of additional charges to users who discharge wastes with concentrations greater than normal domestic strength or wastes of unusual character or contractual agreements with such users, as long as the following conditions are met:
(1) The user pays operation, maintenance, and replacement costs in proportion to the user’s proportionate contribution of wastewater flows and loadings to the treatment plant, and no user is charged at a rate less than that of normal domestic strength wastewater;
(2) The measurements of such 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 §§ 54.01 et seq.
(I) A study of unit costs of collection and treatment processes attributable to flow, BOD, TSS and other significant loadings may be developed for determining the proportionate allocation of costs to flows and loadings for users discharging wastes of greater than normal domestic strength or wastes of unusual character.
(J) Monthly user rates for connections to the city’s municipal sanitary sewer system shall be as set forth in the Fee Schedule Ordinance adopted by reference in § 36.01 of this code.
(1998 Code, § 3.26, Subd. 3) (Ord. 7, 4th Series, eff. 1-1-1988; Ord. 139, 5th Series, passed 5-17-2005)