Chapter 13.30


13.30.010    Industrial waste restrictions.

13.30.020    Industrial waste rate principles.

13.30.030    Establishing rates.

13.30.010 Industrial waste restrictions.

A. It is unlawful to discharge or permit the discharge of industrial wastes into a public sewer under city control into a sewer discharging into the city sewer system unless prior approval of the city is obtained.

B. If any industrial wastes are discharged or are proposed to be discharged to a public sewer, which, in the judgment of the city may have a deleterious effect upon the sewage works, processes, equipment, or receiving waters, or which otherwise create a hazard to life or create malodors, the city may:

1. Reject the waste;

2. Require preliminary treatment to an acceptable condition for discharge to the public sewer; and

3. Require regulation of the quantities and/or rates of discharge.

C. Special Agreements. No statement contained in this section shall be construed as prohibiting any special agreement or arrangement between the city and any person whereby an industrial waste of unusual strength or character may be admitted to the wastewater treatment works, either before or after preliminary treatment; provided, that there is no impairment of the functioning of the wastewater treatment works by reason of the admission of such wastes, and no extra costs are incurred by the city. (Ord. 830 § 1, 1975)

13.30.020 Industrial waste rate principles.

A. General. The Environmental Protection Agency, hereinafter called the EPA, awarded a grant to the city for 75 percent participation in the wastewater treatment plant construction for the city, which is now complete, and the city is required to enact a system of equitable user charges.

B. Statement of Rate.

1. The primary objective in setting industrial waste rates is to provide for equitable distribution of the cost of treatment services, based on the quantity and quality of effluent from system users. Three criteria, liquid flow (Q), biochemical oxygen demand (BOD), and suspended solids (SS), form the principal basis of design and resultant cost for treatment works. As such, these three criteria form a logical basis for development of a fair rate structure. The rate structure contains these components: Q, BOD, and SS.

2. The rates are based on the “average cost pricing” concept. All users shall pay at the same average unit cost of service. No credit for economy of scale, volume discount, or rate reductions based on community impact are included. It is intended that all scale economies shall accrue equally to all users.

C. Industrial Cost Recovery and User Charge System. The system for industrial cost recovery and user charge system shall be implemented and maintained by the city in accordance with this chapter and other ordinances governing the sewer use.

D. Operation and Maintenance Cost Principles. The operation and maintenance cost principles shall be as set forth on the CH2M HILL attachment entitled “Industrial Waste Rate Methods” October 1974, a copy of which is attached to the ordinance codified in this chapter.

E. Summary of Industrial Waste Methods.

1. The proposed rate methods for the industrial wastewater treatment consist of: (1) a fixed annual charge to the industry equal to a calculated percentage of the city’s share of amortized net project costs, for capital costs, and (2) a variable annual user charge to the industry, which is based on the actual loading at the treatment plant, and the actual cost of operation and maintenance.

2. The city-financed actual cost of operation and maintenance portion of the treatment plant’s capital is $76,425. The annual amortized cost of the city’s share of the plant is $7,214 when calculated at seven percent interest over a 20-year repayment period.

3. The charge to an industry would be by unit charges for flow (Q), biochemical oxygen demand (BOD), and suspended solids (SS). Based on the estimates described herein, the cost formula is:

Charge = $244.00 x Q = $0.154 x BOD = 0.014 x SS

4. The unit charges for Q, BOD, and SS are $244.00 per million gallons of Q, $0.154 per pound BOD, and $0.014 per pound SS, respectively. These unit charges will vary annually with actual flows, actual loads, and actual O and M costs. (Ord. 830 § 2, 1975)

13.30.030 Establishing rates.

The city council shall prescribe the industrial waste user rates in accordance with the principles stated in this chapter. (Ord. 830 § 3, 1975)