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(A) No person, unless authorized, shall uncover, make any connection with, or opening into, use, alter, or disturb any sanitary or storm sewer within the city or any part of the city wastewater facilities.
(B) No sanitary or storm sewer shall be constructed in the city (except house or building service sewers) except by the city or by others in accordance with plans and specifications approved by a professional engineer. No such sewers shall be constructed or considered to be part of the public sewer system unless accepted by the city.
(C) The size, slope, alignment, material of construction, methods to be used in excavation, placing of pipe, jointing, testing, backfilling, and other work connected with the construction of sewers shall conform to the requirements of the city.
(Ord. 141, passed 11-6-89) Penalty, see § 10.99
SEWER SERVICE CHARGE SYSTEM
The purpose of this subchapter is to provide for sewer service charges to recover costs associated with:
(A) Operation, maintenance, and replacement to ensure effective functioning of the city’s wastewater treatment system.
(B) Local capital costs incurred in the construction of the city’s wastewater treatment system.
(Ord. 150, passed 7-26-90)
For the purpose of this chapter, 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 (including 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.
COMMERCIAL WASTEWATERS. Domestic wastewater emanating from a place of business 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 said facilities.
NORMAL DOMESTIC STRENGTH WASTEWATER. Wastewater that is primarily produced by residential users, with BOD5 concentrations not greater than 250 mg/l and suspended solids concentrations not greater than 300 mg/l in accordance with § 51.064(A) regulating the use of public sewers for the city.
EXTRA STRENGTH WASTE. Wastewater having a BOD and/or TSS greater than domestic waste as defined in this section and not otherwise classified as an incompatible waste.
GOVERNMENTAL USER. Users which are units, agencies, or instrumentalities of federal, state, or local governments 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. INDUSTRIAL USERS or INDUSTRIES are:
(1) (a) Entitles that discharges 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.
Division A. Agriculture, Forestry, and Fishing
Division B. Mining
Division D. Manufacturing
Division E. Transportation, Communications, Electric, Gas, and Sanitary Sewers
Division I. Services
(b) For the purpose of this definition, domestic waste shall be considered to have the following characteristics.
BOD5 less than 250 mg/l
Suspended Solids less than 300 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, 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.
INFILTRATION/INFLOW (I/I). The total quantity of water from both infiltration and inflow.
INFILTRATION. Water entering the sewage system (including building drains and pipes) from the ground through such means as defective pipes, pipe joints, connections, and manhole walls.
INFLOW. Water other than wastewater that enters a sewer system (including building drains) from sources such as, but not limited to roof leaders, cellar drains, yard and area drains, foundation drains, drains from springs and swampy areas, manhole covers, cross-connection from storm sewers, catch basins, surface runoff, street wash waters, or drainage.
INSTITUTIONAL USER. Users other than commercial, governmental, industrial, or residential users, discharging primarily normal domestic strength wastewater (for example, nonprofit organizations).
OPERATION AND MAINTENANCE. Activities required to provide for the dependable and economical functioning of the treatment works throughout the useful life of the treatment works and at the level of performance for which the treatment works were constructed. OPERATION AND MAINTENANCE includes replacement.
OPERATION, MAINTENANCE, AND REPLACEMENT (OM&R) 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 useful life of the treatment works to maintain the capacity and performance for which such 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 of 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 nonfilterable residue.
TOXIC POLLUTANT. The concentration of any pollutant or combination of pollutants as defined in standards issued pursuant to Section 307(a) of the Clean Water 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, commercial, governmental, institutional, and industrial establishments which are connected to the public sewer collection system.
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.
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, and 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 the ultimate disposal of residues resulting from such treatment.
(Ord. 150, passed 7-26-90)
(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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