§ 52.60 RATES AND CHARGES.

   Users of the City Sewer System shall be subject to the following rates effective October 1, 2017:

   (A)   Residential User Charges.

      (1)   Residential user charges shall be calculated from the following formula:

      Monthly user charge = Base rate + $2.26 (Average water consumption)

      Where:   Monthly user charge = the amount in dollars charged for basic residential sewer services.

      Base rate = $13.34

      Average monthly water consumption = the average monthly water consumption during the months of December, January and February measured in 1,000 gallon units.

      (2)   Whenever an average monthly water consumption has not yet been established, a minimum charge of $26.31 per month shall be used.

   (B)   Commercial User Charges.

      (1)   "COMMERCIAL USER" is hereby defined for the purposes of this section as anyone who uses water for purposes other than domestic use.

      (2)   Commercial user charges shall be calculated from the following formula:

      Monthly user charge = Base rate + $2.57 (Monthly water consumption)

      Where:   Monthly user charge = the amount in dollars charged for basic commercial sewer services.

            Base rate: $13.34

      Monthly water consumption = the monthly water consumption measured in 1,000 gallon units.

      (3)   Commercial user charges shall be calculated from the following: Any commercial user who uses water as an ingredient in the manufacturing process of a product shall not be required to pay a sewer charge based on the water so incorporated into the product. Any such industrial user shall be required to show proof, of the amount of water used as an ingredient in the manufacturing process. The city reserves the right to conduct such tests as it may deem necessary to determine the amount of wastewater placed into the sanitary sewer by such user.

   (C)   The industrial wastewater surcharge is a reimbursement for costs incurred by the city's wastewater treatment plant and sewer collection system from the treatment of pollutants in excess of normal domestic sewage discharged by industrial uses. Assessment of surcharges does not alleviate the industrial user of the responsibility to comply with pretreatment requirements. Consistent non-compliance by an industrial user will result in enforcement actions as defined by this section.

      (1)   Surcharges for excess Biochemical Oxygen Demand (BOD) and Total Suspended Solids (TSS) BOD and TSS surcharges shall be calculated as follows:

Formulas:   Surcharge for TSS = S x (S 1 - Sd) x 8.34 x F

      Surcharges for BOD = B x (B1 - Bd) x 8.34 x F

S   = unit cost of treating ($/lb)

S1    = TSS concentration in sample (mg/L)

B    = unit cost of treating BOD ($/lb)

B1    = BOD concentration sample (mg/L)

Bd    = BOD plant design criteria for normal domestic sewage

     = 200 mg/L (Base value from which the surcharge is calculated)

Sd    = TSS plant design criteria for normal domestic sewage

      = 200 mg/L (Base value from which the surcharge is calculated)

F    = Discharged flow measured in millions of gallons per day (MGD) or millions of gallons (MG)

8.34 = equivalent mass of one gallon of water measured in pounds (8.34 lbs/gal)

      (2)   Current Unit Cost of Treatment for TSS is $.10 per pound; and $.08 per pounds. These values are based on an annual flow of 478.15 million gallons, 1.533 million pounds BOD, 620 thousand pounds TSS, at an annual O&M cost of $365,885.00.

      (3)   Annual Adjustment of Unit Costs. The unit costs of treating TSS(S) and BOD(B) shall be adjusted annually to reflect increases or decreases in wastewater treatment costs based on the previous year's experience as presented in the annual Auditor's Report. In the event that major changes in the industrial base have taken place prior to the annual review, the city may adjust the Unit Cost Rates based on current operational data and expenditures.

         (a)   The Pretreatment Coordinator shall determine the Unit Cost of treatment of BOD and TSS based on the following criteria:

Total volume of treated wastewater for fiscal year

Total mass of BOD treated for fiscal year

Total mass of TSS treated for fiscal year

Total operation and maintenance expenditures for fiscal year based on auditor's report

         (b)   The following assumptions shall be used to determine the percentage of operation and maintenance costs associated with treatment of FLOW, BOD and TSS:

FLOW: 50% of O&M expenditures

BOD: 33% of O&M expenditures

TSS: 17% of O&M expenditures

         (c)   The following formulas shall be applied in determining the unit cost of treatment:

B - 33% C
B T

S - 17% C
S T

Where:

B   = Unit cost of treatment for BOD measured in dollars per pound ($/lb)

C   = Total O&M of BOD expenditures for fiscal year from auditor's report

B T   = Total mass of BOD during fiscal year measured in pounds (lbs)

S   = Unit cost of treatment for TSS measured in dollars per pound ($/lb)

S T = Total mass of TSS treated during fiscal year measured in pounds (lbs)

         (d)   The calculated Unit Cost Rate shall be rounded to the nearest whole cent. (Example: $0.0785 shall be rounded to $0.08)

         (e)   The Pretreatment Coordinator shall submit the unit cost rate adjustments to the city and unit cost rates shall become effective 30 days following approval by the city.

      (4)   Surcharges may be assessed on a daily basis providing the industrial user's wastewater discharge is measured by a totalizing flow meter. BOD and TSS surcharges may be assessed using the arithmetic monthly average of the daily concentrations for each pollutant respectively and the total flow discharged for the month.

   (D)   The Pretreatment Coordinator shall prepare surcharge assessments for all industrial users on a monthly basis and shall submit the assessment to the City Water Billing Department. The discharger shall pay monthly in accordance with practices existing for payment of sewer charges.

   (E)   The city reserves the right to assess surcharges for excess costs of treatment for other pollutants not specified in this section.

(Ord. 480, passed 8-19-91; Ord. 338A, passed 5-5-92; Am. Ord. 493, passed 8-17-92; Am. Ord. 511, passed 8-16-93; Am. Ord. 529, passed 11-21-94; Am. Ord. 530, passed 11-21-94; Am. Ord. 660, passed 8-18-03; Am. Ord. 696, passed 5-16-05; Am. Ord. 766, passed 8-17-09; Am. Ord. 801, passed 3-21-11; Am. Ord. 815, passed 9-19-11; Am. Ord. 828, passed 9-17-12; Am. Ord. 863, passed 9-15-14; Am. Ord. 881, passed 6-5-15; Am. Ord. 927, passed 9-18-17) Penalty, see § 52.99