The wastewater service charge for the use of and for service supplied by the wastewater facilities of the city shall consist of a basic user charge for operation and maintenance plus replacement, applicable surcharges, and local capital cost charge composed of a debt service charge and a capital improvement charge.
(A) Basis For Wastewater Service Charges: The debt service charge is computed by apportioning the annual debt service on a cost per one thousand (1,000) gallon basis.
The capital improvement charge is levied on all users to provide for capital improvements, extensions or reconstruction of the sewage treatment works. The capital improvement is computed by apportioning the annual amount to be accrued as a cost per one thousand (1,000) gallons.
The basic user charge shall be based on water usage as recorded by water meters for wastes having the following normal domestic concentrations:
1. A five (5) day twenty degree centigrade (20°C) biochemical oxygen demand (BOD of 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 be computed as follows:
1. Estimate wastewater volume, pounds of SS and pounds of BOD to be treated.
2. Estimate the projected annual revenue required to operate and maintain the wastewater facilities including a replacement fund for the year, for all works categories.
3. Proportion the estimated operation, maintenance and replacement costs to each user class by volume, suspended solids and BOD.
4. Proportion the estimated operation, maintenance and replacement (OM&R) costs to wastewater facility categories by volume, suspended solids and BOD.
5. Compute costs per one thousand (1,000) gallons for normal sewage strength.
6. Compute surcharge costs per pound per one thousand (1,000) gallons in excess of normal sewage strength for BOD and SS.
A surcharge will be levied to all users whose waters exceed the normal domestic concentrations of BOD (200 mg/l) and SS (250 mg/l). The surcharge will be based on water usage as recorded by water 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 (C) of this section specifies the procedure to compute a surcharge.
The adequacy of the wastewater service charge shall be reviewed, not less often than annually, by certified public accountants for the city in their annual audit report. The wastewater service charge shall be revised periodically to reflect a change in local capital costs or a change in operation and maintenance costs including replacement costs.
The users of wastewater treatment services will be notified annually, in conjunction with a regular bill, of the rate and that portion of the user charges which are attributable to the wastewater treatment operation, maintenance and replacement.
(B) Surcharge Rate: The rates of surcharges for BOD5 and SS shall be as follows:
Per pound of BOD | $0.14 |
Per pound of SS | 0.12 |
(C) Computation Of Surcharge: The concentration of wastes used for computing surcharges shall be established by waste sampling. Waste sampling shall be performed as often as may be deemed necessary by the city and shall be binding as a basis for surcharges.
(D) Computation Of Wastewater Service Charge: The wastewater service charge shall be computed by the following formula:
CW = CC + CD + CM + (Vu - X) CU + CS
Where: | |||
CW | = | Amount of waste service charge ($) per billing period. | |
CD | = | Debt service charge. | |
CC | = | Capital improvement charge. | |
CM | = | Minimum charge for operation, maintenance and replacement. | |
Vu | = | Wastewater volume for the billing period. | |
X | = | Allowable consumption in gallons for the minimum charge. | |
CU | = | Basic user rate for operation, maintenance and replacement. | |
CS | = | Amount of surcharge. | |
(Ord. 688, 2-20-1989)