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(A) The city establishes a sewer service charge system whereby all revenue collected from users of the wastewater treatment facilities will be used to affect all expenditures incurred for annual operation, maintenance, and replacement and for debt service on capital expenditure incurred in constructing the wastewater treatment works.
(B) Each user shall pay its proportionate share of operation, maintenance, and replacement costs of the treatment works, based on the users proportionate contribution to the total wastewater loading from all users.
(C) Each user shall pay debt service charges to retire local capital costs as determined by the City Council.
(D) Sewer service rates and charges to users of the wastewater treatment facility shall be determined and fixed in the sewer service charge system developed according to the provisions of this subchapter. The sewer service charge system developed with the assistance of the consulting engineer shall be adopted by resolution upon enactment of this subchapter, shall be published in the local newspaper, and shall be effective upon publication. Subsequent changes in the sewer service rates and charges shall be adopted by Council resolution and shall be published in the local newspaper.
(E) Revenues collected for sewer service shall be deposited in a separate fund known as the Sewer Service Fund. Income from revenues collected will be expended to offset the cost of operation, maintenance, and equipment replacement for the facility and to retire the debt for capital expenditure.
(F) Sewer service charges and the Sewer Service Fund will be administrated in accordance with the provisions of § 51.129.
(Ord. 150, passed 7-26-90)
(A) (1) Users of the city wastewater treatment works shall be identified as belonging to one of the following user classes:
(a) Residential;
(b) Commercial;
(c) Institutional/Governmental; or
(d) 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 Manager. Allocation of users to user classes shall be based on the substantive intent of the definitions of these classes contained herein.
(B) (1) 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 250 mg/l BOD and 300 mg/l TSS (for example, normal domestic strength wastewater) as defined in § 51.121.
(2) Those industrial users discharging segregated normal domestic strength wastewater only can be classified as commercial users for the purpose of rate determination.
(Ord. 150, passed 7-26-90)
(A) Annual base rate. The base rate shall include the following items:
(1) Determine the annual OM&R budget.
(2) Allocate total annual OM&R costs to flow, BOD, and TSS proportionately, according to the costs of collection and treatment of flow, BOD, and TSS.
(3) Proportion the flow costs between infiltration/inflow and billable volume. OM&R costs for infiltration and inflow shall be divided equally among all users of the system.
(4) The OM&R costs for administrative and billing shall be divided equally among all users of the system.
Where: Br = Base Rate recovery of costs from infiltration/inflow and administrative services.
(5) The City Council may at their discretion add a sinking fund cost for collection system replacement.
(B) Debt service charge. Debt retirement costs shall be allocated to all users. Two options for the debt service charge are presented in Appendix B.
(C) Calculation of unit costs for treatment of flow, BOD, and TSS. For purposes of determining the proportionate charges, unit costs for treatment of flow, BOD, and TSS shall be determined and fixed annually in the sewer service charge system according to the following procedure. Divide the OM&R costs attributable to billable flow, BOD, and TSS respectively by the total annual billable volume and loadings of flow, BOD, and TSS to arrive at unit costs.
(1) For purposes of determining charges, the following definitions of unit costs shall apply:
Uf = Unit cost for treatment of billable flow in $/CCF.
Ubod = Unit cost for treatment of BOD in $/lb.
Utss = Unit cost for treatment of TSS In $/lb.
(CCF = 100 cubic feet = 748 gallons.)
(2) Unit costs are provided in Appendix A of the sewer service charge system developed with the assistance of the consulting engineer. Subsequent calculations of unit costs shall be according to the substantive intent of this SSCS.
(Ord. 150, passed 7-26-90)
(A) Calculating billable flows and loading.
(1) Measurement of wastewater volume. 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:
(a) Residential users. Billable wastewater volume for residential users shall be calculated on the basis of metered water usage. The wastewater will be billed monthly based off of actual water usage for the months of November through April. May through October the wastewater shall be calculated by an average water usage from the prior November through April months. The city may require residential users to install water meters for the purpose of determining billable wastewater volume.
(b) Nonresidential users.
1. The billable wastewater volume of nonresidential users may be determined in the same manner as for residential users, except that if the city determines that there are significant seasonal variations in the metered water usage of nonresidential users resulting in a proportionate increase (or decrease) in wastewater volume, then billable wastewater volume shall be:
a. Calculated on the basis of quarterly metered water usage as recorded throughout the year, or
b. Calculated on the basis of wastewater flow meters.
2. The city may, at its discretion, require nonresidential users to install such additional water meters or wastewater flow meters as may be necessary to determine billable wastewater volume.
(2) Determination of loadings from metered water usage. The billable amounts of BOD and TSS will be calculated from the volume of metered water usage, as determined above, where the billable quantities will be those attributable to wastewater at a concentration of 250 mg/l BOD and 300 mg/l TSS (normal domestic strength wastewater).
(B) Determination of sewer service charges for normal domestic strength users. User charges for normal domestic strength users shall be determined as follows:
(1) Calculation of unit costs for treatment of normal domestic strength wastewater:
Un = Uf + [(Ubod)(1.560)] + [(Utss)(1.871)]
Where: Un = Unit cost of operation, maintenance, and replacement to treat normal domestic strength, in $/CCf.
Uf = Unit cost for treatment of billable flow in $/CCF.
Ubod = Unit cost for treatment of BOD in $/lb.
Utss = Unit cost for treatment of TSS in $/lb.
1.560 = Lbs. of BOD in 1 CCF of normal domestic strength wastewater.
1.871 = Lbs. of TSS in 1 CCF of normal domestic strength wastewater.
(2) Calculation of sewer service charge for normal domestic strength wastewater:
SSC = Br + DSC + (Un x Bwv)
Where: SSC = Sewer service charge
Br = Base rate
DSC = Debt service charge
Un = Unit cost for operation, maintenance, and replacement to treat normal domestic strength, in $/CCF.
Bwv = Billable wastewater volume of the particular user in CCF.
(Ord. 150, passed 7-26-90; Am. Ord. 386, passed 1-11-16)
(A) Calculating billable flows and loadings.
(1) Calculation of billable flows. The billable amount of flow will be calculated from the volume of metered water usage, or at the discretion of the city, from the measurement of effluent flow at user’s point of discharge. Measurements shall be according to a regular program prescribed by the city.
(2) Calculation of billable loadings.
(a) The billable amounts of BOD and TSS will be calculated by the measurement of these wastes according to a program prescribed by the city in keeping with the latest edition of “Standard Methods for the Examination of Water and Wastewater” and in accordance with this chapter.
(b) To insure compliance with § 51.122, the following procedures shall be followed in determining average loadings per billing period for industrial users:
1. When a particular reading indicates concentrations greater than or equal to normal domestic strength, the actual reading shall be entered into the average for billing purposes.
2. When a particular reading indicates concentrations less than normal domestic strength, normal domestic strength shall be entered into the average for billing purposes.
(B) Determination of sewer service charge for greater than normal domestic strength users.
SSC = Br + DSC + [Un x Bwv] + [Ubod x k x Bwv(Cbod-Nbod)]
+ [Utss x k x Bwv(Ctss-Ntss)]
SSC = Sewer service charge
Br = Base rate
DSC = Debt service charge
Un = Unit cost for the treatment of normal domestic strength wastewater.
Bwv = Billable wastewater volume of the particular user, in CCF.
Ubod = Unit cost for treatment of BOD in $/lb.
k = .00624 (conversion factor)
Cbod = Users concentration of BOD, in mg/l.
Nbod = 250 mg/l [Concentration of BOD in normal domestic strength wastes]
Utss = Unit cost for treatment of TSS in $/lb.
Ctss = User concentration of TSS, in mg/l.
Ntss = 300 mg/l [Concentration of TSS in normal domestic strength wastes]
(Ord. 150, passed 7-26-90)
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