Sewer service users shall be billed on the basis of the following schedule:

    1.a. Charges to domestic-commercial and industrial-commercial users shall be established on the basis of individual water usage, as determined through water meter readings, with charges calculated at a constant commodity rate in addition to the fixed costs for meter reading and billing, and for meter maintenance costs of city-owned water meters.

    b. Minimum charges for each size of meter employed shall be continued as the initial charge to each domestic-commercial user, to cover the fixed costs referred to above, and with the allowable water usage under such minimum bills to be the same as provided for under minimum bills for the sale of water, but with the charge for such usage calculated at the constant commodity rate established for domestic-commercial water usage.

    c. the sewer use charge for residential users billed quarterly shall be the same for each of the four quarters of the calendar year, and shall be determined by quarterly water usage as shown by water meter readings taken in January, February or March of each calendar year, and that the sewer use charge for residential contributors billed monthly be the same for each month of the calendar year, and shall be determined  by the average monthly water usage as shown by water meter readings taken in January, February and March of each calendar year.

    d. The city will review water usage and billings, for either quarterly or monthly billed users; in cases where water usage as shown by meter readings is less than the established winter quarter consumption, the actual consumption will be used in calculating sewer charges for that billing period only.

    2.a. Charges to major industrial users for the delivery systems and treatment shall be established on the basis of applicable costs of operation, maintenance, and replacements of the delivery systems and the waste water treatment plant.  Charges for the collection system shall be established on the basis of 60% of applicable costs of operation, maintenance, and replacement of the collection systems.  Monthly flow units shall be calculated from readings of individual industrial owned flow meters.

    b. Monthly loadings of BOD, solids and grease are calculated from laboratory analyses of individual composited wastewater samples applied to flows during the month. Individual industry charges shall be based upon actual usage.  Discharges over a weekend shall be measured on Monday and charged for actual sewage discharged at the rates established herein.

    c. Grease loadings in excess of one hundred mg/1 are also calculated and are billed for at the same rate as for solids.

    d. In addition, industrial users shall also be charged the costs of billing, sample collection and sample testing.  Charges shall include, but not be limited to, the actual cost of travel, labor, chemicals, equipment replacement and other charges resulting from the sampling and testing of the wastes of the industry.

    e. All major industrial users shall enter into a service contract with the city for maintenance of metering and sampling stations.  The city shall service and maintain the metering and sampling stations on an actual cost basis with all charges to be billed directly to the industry for all labor and materials required to insure the proper operation of the stations.  Provisions shall also be incorporated for securing the stations and limiting access to city and other authorized industrial personnel only.

    3. Charges to industrial users contributing as much as ten percent of the treatment works design loadings in terms of flow, five-day BOD, or solids loadings, shall be established by a negotiated contract with the individual industry.  Rates shall include all charges assessed against major industrial users and shall be at least equal to the ordinance rates in effect at the time of the contract.

    4. Charges to the outside municipalities for wastewater flow have been established through individually negotiated contracts.  Under these contracts, the charges are calculated on the same basis as is employed for Sioux City domestic-commercial, industrial-commercial, and major industrial users, for operation and maintenance of the delivery system and treatment facilities, including replacements, and billing charges for the number of bills rendered as taken from the Sioux City trial rate schedule, and for capital charges.  In addition, there shall be added a seven-percent service charge, applied to the costs for treatment facilities only, to offset the costs for other departmental services provided, but not billed to the treatment works, including administrative, engineering and public safety services, etc.  (Ord. 90/T-8973; 89/T-7415; S-43358, 1981; S-39109, 1979).