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For the purpose of this subchapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
ADMINISTRATION. Those fixed costs attributable to administration of the wastewater treatment works (for example, billing and associated bookkeeping and accounting costs).
BIOCHEMICAL OXYGEN DEMAND or BOD5. The quantity of oxygen utilized in the biochemical oxidation of organic matter under standard laboratory procedure in five days at 20°C, expressed in milligrams per liter.
COMMERCIAL USER. Any place of business which discharges sanitary waste as distinct from industrial wastewater.
DEBT SERVICE CHARGE. A charge levied on users of wastewater treatment facilities for the cost of repaying money bonded to construct the facilities.
EXTRA STRENGTH WASTE. Wastewater having a BOD5 and/or TSS greater than domestic waste and not otherwise classified as an incompatible waste.
GOVERNMENTAL USER. Users which are units, agencies or instrumentalities of federal, state or local government discharging normal domestic strength wastewater.
INCOMPATIBLE WASTE. Waste that either singly or by interaction with other wastes interferes with any waste treatment process, constitutes a hazard to humans or animals, creates a public nuisance or creates any hazard in the receiving waters of the wastewater treatment works.
INDUSTRIAL USERS or INDUSTRIES.
(1) (a) Entitles that discharge into a publicly owned wastewater treatment works, liquid wastes resulting from the processes employed in industrial or manufacturing processes, or from the development of any natural resources. These are identified in the Standard Industrial Classification Manual, 1972, Office of Management and Budget, as amended and supplemental under one of the following divisions:
1. Division A - Agriculture, Forestry and Fishing;
2. Division B - Mining;
3. Division D - Manufacturing;
4. Division E - Transportation, Communications, Electric, Gas and Sanitary Sewers; and
5. Division I - Services.
(b) For the purpose of this definition, domestic waste shall be considered to have the following characteristics:
BOD
5 | Less than 222 mg/l |
Suspended solids | Less than 260 mg/l |
(2) Any nongovernmental user of a publicly owned treatment works which discharges wastewater to the treatment works which contains toxic pollutants or poisonous solids, liquids or gases in sufficient quantity either singly or by interaction with other wastes, to contaminate the sludge of any municipal systems, or to injure or to interfere with any sewage treatment process, or which constitutes a hazard to humans or animals, creates a public nuisance or creates any hazard in or has an adverse effect on the waters receiving any discharge from the treatment works.
INDUSTRIAL WASTEWATER. The liquid processing wastes from an industrial manufacturing process, trade or business including but not limited to all Standard Industrial Classification Manual Divisions A, B, D, E and I manufacturers as distinct from domestic wastewater.
INSTITUTIONAL USER. Users other than commercial, governmental, industrial or residential users, discharging primarily normal domestic strength wastewater (such as, non-profit organizations).
NORMAL DOMESTIC STRENGTH WASTEWATER. Wastewater that is primarily produced by residential users with BOD5 concentrations not greater than 222 mg/l and suspended solids concentrations not greater than 260 mg/l.
OPERATION AND MAINTENANCE. Activities required to provide for the dependable and economical functioning of the treatment works, throughout the design or useful life, whichever is longer of the treatment works, and at the level of performance for which the treatment works were constructed. OPERATION AND MAINTENANCE includes replacement.
OPERATION AND MAINTENANCE COSTS. Expenditures for operation and maintenance, including replacement.
PUBLIC WASTEWATER COLLECTION SYSTEM. A system of sanitary sewers owned, maintained, operated and controlled by the city.
REPLACEMENT. Obtaining and installing of equipment, accessories or appurtenances which are necessary during the design life or useful life, whichever is longer, of the treatment works to maintain the capacity and performance for which the works were designed and constructed.
REPLACEMENT COSTS. Expenditures for replacement.
RESIDENTIAL USER. A user of the treatment facilities whose premises or building is used primarily as a residence for one or more persons, including dwelling units such as detached and semi-detached housing, apartments and mobile homes; and which discharges primarily normal domestic strength sanitary wastes.
SANITARY SEWER. A sewer intended to carry only liquid and water carried wastes from residences, commercial buildings, industrial plants and institutions, together with minor quantities of ground, storm and surface waters which are not admitted intentionally.
SEWER SERVICE CHARGE. The aggregate of all charges, including charges for operation, maintenance, replacement, debt service and other sewer related charges that are billed periodically to users to the city’s wastewater treatment facilities.
SEWER SERVICE FUND. A fund into which income from sewer service charges is deposited along with other income, including taxes intended to retire debt incurred through capital expenditure for wastewater treatment. Expenditure of the SEWER SERVICE FUND will be for operation, maintenance and replacement costs and to retire debt incurred through capital expenditure for wastewater treatment.
SLUG. Any discharge of water or wastewater which in concentration of any given constituent or in quantity of flow exceeds for any period of duration longer than 15 minutes more than five times the average 24-hour concentration or flows during normal operation and shall adversely affect the collection system and/or performance of the wastewater treatment works.
STANDARD INDUSTRIAL CLASSIFICATION MANUAL. Office of Management and Budget, 1972.
SUSPENDED SOLIDS (SS) or TOTAL SUSPENDED SOLIDS (TSS). The total suspended matter that either floats on the surface or is in suspension in water, wastewater or other liquids, and is removable by laboratory filtering as prescribed in Standard Methods for the Examination of Water and Wastewater, latest edition, and referred to as non-filterable residue.
TOXIC POLLUTANT. The concentration of any pollutant or combination of pollutants as defined in standards issued pursuant to § 307(a) of the Act, which upon exposure to or assimilation into any organism will cause adverse effects.
USER CHARGE. A charge levied on users of a treatment works for the user’s proportionate share of the cost of operation and maintenance, including replacement.
USERS. Those residential, nonresidential and industrial establishments which are connected to the public sewer collection system.
WASTEWATER TREATMENT WORKS or TREATMENT WORKS. An arrangement of any devices, facilities, structures, equipment or processes owned or used by the city for the purpose of the transmission, storage, treatment, recycling and reclamation of municipal sewage, domestic sewage or industrial wastewater, or structures necessary to recycle or reuse water including interceptor sewers, outfall sewers, collection sewers, pumping, power and other equipment and their appurtenances; extensions, improvements, remodeling, additions and alterations thereof; elements essential to provide a reliable recycled water supply such as standby treatment units and clear well facilities; and any works including land which is an integral part of the treatment process or is used for ultimate disposal of residues resulting from the treatment.
WASTEWATER. The spent water of a community, also referred to as SEWAGE. From the standpoint of source, it may be a combination of the liquid and water-carried wastes from residences, commercial buildings, industrial plants and institutions together with any ground water, surface water and storm water that may be present.
(Ord. 407, passed 12-26-1989)
(A) The city hereby 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 a “sewer service charge system” developed according to the provisions of this chapter. The sewer service charge system developed with the assistance of Bolton & Menk, Inc. shall be adopted by resolution upon enactment of this chapter, shall be published in the local newspaper and shall be effective upon publication. Subsequent changes in 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 provision of § 53.143.
(Ord. 407, passed 12-26-1989)
DETERMINATION OF SEWER SERVICE CHARGES
(A) Users of the city wastewater treatment works shall be identified as belonging to one of the following user classes:
(1) Residential;
(2) Commercial;
(3) Governmental;
(4) Institutional; and
(5) Industrial.
(B) 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.
(Ord. 407, passed 12-26-1989)
(A) 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 222 mg/l BOD and 260 mg/l TSS (for example, normal domestic strength wastewater).
(B) Those industrial users discharging segregated normal domestic strength wastewater only, can be classified as commercial users for the purpose of rate determination.
(Ord. 407, passed 12-26-1989)
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.
(1) Billable wastewater volume for residential users shall be calculated on the basis of metered water usage. The monthly billable wastewater volume shall be equal to monthly metered water usage.
(2) 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 will be determined in same manner as for residential users.
(2) The city may, at its discretion, require nonresidential users to install additional water meters or wastewater flow meters as may be necessary to determine billable wastewater volume.
(C) Industrial users. The billable wastewater volume of industrial users will be determined on 100% of the metered water usage as recorded throughout the year or calculated on the basis of wastewater flow meter. In addition, the billable wastewater loading above normal domestic wastewater strength (222 mg/l BOD and 260 mg/l TSS) will be determined by testing the concentrations of BOD and TSS being discharged from the industries.
(Ord. 407, passed 12-26-1989)
(A) User charges for normal domestic users shall be determined as follows.
(1) Calculation of unit cost for treatment of normal domestic strength wastewater.
Un = Uf + [.001 x 8.34 x Nbod x Ubod] + [.001 x 8.34 x Ntss x Utss]
Where:
Un = Unit cost for operation, maintenance and replacement to treat normal domestic strength in $/kgal
Uf = Unit cost for treatment of flow in $/kgal
Uf = [Total annual OM&R costs attributable to flow]
[Total annual billable flow in kgal]
Nbod = Normal domestic strength BOD concentration
Ubod = Unit cost for treatment of BOD in $/lb
Ubod = [Total annual OM&R costs attributable to BOD]
[Total annual billable BOD in lbs]
NTss = Normal domestic strength of TSS concentration
UTss = Unit cost for treatment of TSS in $/lb
UTss = [Total annual OM&R costs attributable to TSS]
[Total annual billable TSS in lbs]
(2) Calculation of user charge.
Uc = Un x bwv
Where:
Uc = User charge
Un = Unit cost for operation, maintenance and replacement to treat normal domestic strength in $/1,000 gal
bwv = Billable wastewater volume of a particular user in 1,000 gal
(B) User charges for users discharging wastes with concentrations greater than normal domestic strength.
(1) Calculating billable flows and loadings.
(a) 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.
(b) Calculation of billable loadings.
1. 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.
2. To ensure compliance with § 53.122(B), the following procedures shall be followed in determining average loadings per billing period for industrial users.
A. 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.
B. When a particular reading indicates concentrations less than normal domestic strength, normal domestic strength shall be entered into the average for billing purposes.
(2) Determination of user charge for greater than normal domestic strength users.
(a) Calculation of unit costs for treatment of flow, BOD and TSS. For purposes of determining proportionate surcharges, 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:
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; and
3. Divide the OM&R attributable to flow, BOD and TSS respectively, by the total annual billable volume and loadings of flow, BOD and TSS to arrive at unit costs.
(b) Calculation of user charges for treatment of wastewaters with concentrations exceeding that of normal domestic strength wastewater.
Uc = [Un x bwv] + [Ubod x K x bwv (Cbod-Nbod)] + [Utss x K x bwv (Ctss-Ntss)]
Un = Unit cost for the treatment of normal domestic strength wastewater
bwv = Billable wastewater volume of a particular user in kgal
Ubod = Unit cost for treatment of BOD in $/lb K = .00834
Cbod = Users concentration of BOD in mg/l
Nbod = 222 mg/l [concentration of BOD in normal domestic strength wastes]
Utss = Unit cost for treatment of TSS in $/lb
Ctss = Users concentration of TSS in mg/l
Ntss = 260 mg/l [concentration of TSS in normal domestic strength wastes]
(Ord. 407, passed 12-26-1989)
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