Sec. 26-97. Wastewater treatment rates.
(a) Each user shall pay for the services provided by the city based on his, her or its use of the treatment works as determined by a water meter acceptable to the city.
(b) For industrial and commercial contributors, user charges shall be based on water used during the current billing period. If a commercial or industrial contributor has a consumptive use of water, or in some other manner uses water which is not returned to the waste water collection system, the user charge for that contributor may be based on a waste water meter(s) or separate water meter(s) installed and maintained at the contributor's expense, and in a manner acceptable to the city.
(c) Buildings housing four (4) or more apartments and trailer courts shall be billed as commercial users.
(d) For residential contributors, bimonthly user charges will be based on usage during the months of December and January, or January and February. The usage for each bimonthly billing cycle shall be adjusted to 1/6 of a year by the following formula: the current usage divided by the number of days between meter readings times three hundred sixty-five (365) divided by six (6). If a residential contributor has not established a December and January, or January and February usage, his or her bimonthly user charge shall be the average adjusted charge of all other residential contributors. If a residential contributor’s usage falls below his or her base usage in any period, his or her sewer charge will be based on actual adjusted sewer usage for that period; however, in no event shall the rate be less than the minimum sewer charge as set forth in subsection (e) below. The foregoing sewer charge calculation shall be in effect for any and all sewer charges generated on or after January 31, 1998.
(e) The minimum charge for residential and commercial sanitary sewer rates per bimonthly period shall be as set forth in Section 2-5 of this Code. In addition, each contributor shall pay a user charge rate as set forth in Section 2-5 of this Code.
(f) For those contributors who discharge wastewater of strength greater than normal domestic sewage, a normal user charge and surcharge will be collected.
Normal user charges shall be as set forth in Section 2-5 of this Code.
At the approximate end of each month, a computation shall be made to determine the surcharge for each property discharging industrial wastes or other high strength wastewater, using the following formula:
SC = [Rp x (Pi-Pn) + Rs x (Si-Sn) + Rn x (Ni-Nn) + Rx x (Xi-Xn)] x 8.34 x V
SC = Surcharge in $
Rp = Unit BOD cost of treating normal sewage in $/lb.
Pi = BOD or .6 x COD in the industrial waste in mg/l.
Pn = BOD or .6 x COD in normal sewage in mg/l.
Rs = Unit suspended solids cost of treating normal sewage in $/lb.
Si = Suspended solids in the industrial waste in mg/l.
Sn = Suspended solids in normal sewage in mg/l.
Rn = Unit Kjeldhal nitrogen (TKN) cost of treating normal sewage in $/lb.
Ni = TKN in the industrial waste in mg/l.
Nn = TKN in normal sewage in mg/l.
Rx = Unit cost of treating any additional pollutants in the industrial waste in $/lb.
Xi = Substance requiring additional treatment in the industrial waste in mg/l.
Xn = Substance requiring additional treatment in the normal sewage in mg/l.
8.34 = lb/million gallons (mg/l).
V = Wastewater volume in millions of gallons.
It has been calculated that the following values will apply:
Rp = As set forth in Section 2-5 of this Code.
Pn = 300 mg/l.
Rs = As set forth in Section 2-5 of this Code.
Sn = 300 mg/l.
Rn = As set forth in Section 2-5 of this Code.
Nn = 40 mg/l
(g) Any user which discharges any toxic pollutants which cause an increase in the cost of managing the effluent or the sludge from the city's treatment works, or any user which discharges any substance which singly or by interaction with other substances causes identifiable increases in the cost of operation, maintenance or replacement of the treatment works, shall pay for such increased costs. The charge to each such user shall be as determined by the responsible plant operating personnel and approved by the city council.
(h) The user charge rates established in this article apply to all users, regardless of their location, of the city's treatment works.
(i) Any user of the city's liquid waste dump station for the disposal of special wastes shall be subject to a minimum handling fee as set forth in Section 2-5 of this Code. Each mud pit load is subject to a minimum fee plus transfer station tipping fees as set forth in Section 2-5 of this Code..
Source: Ord. No. 3014, § 5, 10-5-81; Ord. No. 3148, § 1, 6-20-83; Ord. No. 3587, § 2, 9-6-88; Ord. No. 3756, § 1, 12-10-90; Ord. No. 3767, § 1, 1-7-91; Ord. No. 4037, § 1, 7-18-94; Ord. No. 4103, §§ 1, 2, 8-21-95; Ord. No. 4140, §§ 1, 2, 2-5-96; Ord. No. 4193, §§ 1, 2, 9-16-96; Ord. No. 4293, §§ 1, 2, 9-7-97; Ord. No. 4306, § 3, 9-15-97; Ord. No. 4428, §§ 1, 2, 9-7-99; Ord. No. 4824, §§ 1, 2, 9-19-05; Ord. No. 4906, § 1, 10-03-06; Ord. No. 5035, § 1, 10-6-08; Ord. No. 5091, § 1, 9-14-09; Ord. No. 5127, § 1, 8-16-10; Ord. No. 5135, § 17, 9-7-10