(A) Basis For Wastewater Charges: The wastewater charge for the use of and for service supplied by the wastewater facilities of the city shall consist of a service charge, a capital improvement charge, a basic user charge for operation and maintenance plus replacement, and a surcharge, if applicable.

The service charge shall not be less than that computed by dividing the annual debt service costs, including minimum required depreciation and reserve accounts, by the total number of users. Through further divisions, the quarterly minimum required service charge can be computed.

The capital improvement charge shall be based on a quarterly charge to each customer of the system to apply toward future capital improvement projects.

The basic user charge shall be based on water usage as recorded by water meters and/or sewage meters for wastes having the following normal concentrations:

1. A five (5) day, twenty degree centigrade (20°C) biochemical oxygen demand (BOD) of two hundred milligrams per liter (200 mg/l).

2. A suspended solids (SS) content of two hundred fifty milligrams per liter (250 mg/l)

It shall consist of operation and maintenance costs plus replacement and shall not be less than that computed as follows:

1. Estimate the projected annual revenue required to operate and maintain the wastewater facilities, including replacement of selected equipment, for all work categories.

2. Proportion the estimated costs to wastewater facility categories by volume, suspended solids and BOD, if possible.

3. Estimate wastewater volume, pounds of SS and pounds of BOD to be treated.

4. Proportion the estimated costs to customer classes by volume, suspended solids and BOD.

5. Compute costs per one hundred (100) cubic feet for normal sewage strength.

6. Compute surcharge costs per one hundred (100) cubic feet per milligrams per liter in excess of normal sewage strength for BOD and SS.

A surcharge will be levied to all users whose waters exceed the normal concentrations for BOD (200 mg/l) and SS (250 mg/l). The surcharge will be based on water usage as recorded by water meters and/or sewage meters for all wastes which exceed the two hundred milligrams per liter (200 mg/l) and two hundred fifty milligrams per liter (250 mg/l) concentration for BOD and SS, respectively. Subsection (F) of this section specifies the procedure to compute a surcharge.

The service charge, the capital improvement charge, the basic user charge, and the surcharge are all computed as shown on the attached "Engineering Data" sheets, which are hereby made a part of this chapter.

The adequacy of the wastewater charges shall be reviewed annually by certified public accountants for the city in their annual audit report. The wastewater charges shall be revised periodically to reflect a change in service costs, in operation and maintenance costs, including replacement costs, or in administrative and reserve costs.

(B) Measurement Of Flow: The volume of flow used for computing basic user charges and surcharges shall be the metered water consumption read to the nearest whole cubic foot.

1. If the person discharging waters into the public sewers procures any part, or all, of his water from sources other than the city waterworks system, all or a part of which is discharged into the public sewers, the person shall install and maintain, at his expense, water meters of a type approved by the city for the purpose of determining the volume of water obtained from these other sources.

2. Devices for measuring the volume of waste discharged may be required by the city if these volumes cannot otherwise be determined from the metered water consumption records.

3. Metering devices for determining the volume of waste shall be installed, owned and maintained by the person. Following approval and installation, such meters may not be removed, unless service is canceled, without the consent of the city.

(C) Minimum User Charge: There shall be and there is hereby established a minimum user charge (including a service charge and a basic user charge) for the use of and for service supplied by the wastewater facilities of the city. A minimum user charge of twenty eight dollars fifty cents ($28.50) per quarter shall be applied to all users whose water consumption does not exceed five hundred (500) cubic feet per quarter. The minimum user charge consists of twenty three dollars seventy five cents ($23.75) for the service charge, three dollars ($3.00) for the capital improvement charge, and one dollar seventy five cents ($1.75) for operation, maintenance and replacement for the first five hundred (500) cubic feet. A basic user rate of thirty five cents ($0.35) per one hundred (100) cubic feet shall be applied to all users for water consumption over five hundred (500) cubic feet per quarter.

(D) Flat Rate Charge: All nonmetered residential users of the wastewater facilities shall pay a minimum flat rate charge consisting of twenty three dollars seventy five cents ($23.75) per quarter to cover the costs of the service charge, three dollars ($3.00) for the capital improvement charge, and the basic user charge of thirty five cents ($0.35) per one hundred (100) cubic feet. The flat rate charge will allow a maximum of two thousand five hundred (2,500) cubic feet per quarter; and is hereby established to be thirty five dollars fifty cents ($35.50) per quarter. In the event the twelve (12) month average use of the wastewater facilities is determined by the city to be in excess of two thousand five hundred (2,500) cubic feet per quarter, the city may require such flat rate user to install metering devices on the water supply or sewer main to measure the amount of service supplied.

(E) Surcharge Rate: The rates or surcharges for BOD and SS shall be as follows:

1. For BOD, a surcharge rate of $0.0754 per pound shall be applied for a waste strength in excess of two hundred milligrams per liter (200 mg/l).

2. For SS, a surcharge rate of $0.0430 per pound shall be applied for a waste strength in excess of two hundred fifty milligrams per liter (250 mg/l).

(F) Computing Of Surcharge: The concentration of wastes used for computing surcharges shall be established by waste sampling. Waste sampling shall be performed as often as may be deemed necessary by the city and shall be binding as a basis for surcharges. The surcharge shall be the sum of subsections (F)1 and (F)2 of this section computed as follows:

1. For BOD, multiply the surcharge rate by 8.34 (conversion factor for number of pounds per gallon) multiplied by .0007481 million gallons (100 cubic feet = 748.1 gallons). This number is then multiplied by the concentration amount above the allowable two hundred milligrams per liter (200 mg/l), multiplied by the number of one hundred (100) cubic foot units contributed for the day. This yields a surcharge per day for BOD (in cost per 100 cubic feet per milligrams per liter in excess).

2. For suspended solids, multiply the surcharge rate by 8.34 (conversion factor for number of pounds per gallons) multiplied by .0007481 million gallons (100 cubic feet = 748.1 gallons). This number is then multiplied by the concentration amount above the allowable two hundred fifty milligrams per liter (250 mg/l), multiplied by the number of one hundred (100) cubic foot units contributed for the day. This yields a surcharge per day for suspended solids (in cost per 100 cubic feet per milligrams per liter in excess).

(G) Computation Of Wastewater Charge: The wastewater charge shall be computed by the following formula:

W = SC + CIC + (V times BUR) + S

Where:

W | = | Amount of wastewater charged ($) per billing period |

SC | = | Service charge (subsection (A)) |

CIC | = | Capital improvement charge (subsection (A)) |

V | = | Wastewater volume for the billing period |

BUR | = | Basic user rate for operation, maintenance and replacement (subsection (C)) |

S | = | Amount of surcharge (subsections (E) and (F)) |

(Ord. 14/88, 3-20-1989)