924.03 EXTRA-STRENGTH SURCHARGES.

   In addition to the base user charges applicable pursuant to Section 924.02, users discharging pollutants to the wastewater treatment works, whose average concentration, as defined in Section 923.01(10), in one or more classifications exceeds in any month that concentration defined as normal in Section 923.01(10), in the corresponding classification shall be subject to surcharges calculated as follows:

   (a)    Surcharges for each billing period during a calendar year shall be based upon the following values for that calendar year: the estimated total operation and maintenance expenses (Cto); the estimated total pounds of COD received at the plant (Ct); and the estimated total pounds of suspended solids received at the plant (St). Data not available shall be estimated in the most practical manner possible.

   (b)    Surcharge on user charges per pound of COD in excess of normal equals:

                   Cto        

                  Ct 3.3333

   (c)    Surcharge on user charges per pound of suspended solids in excess of normal equals:

                   Cto         

                  St x 3.3333

       (Ord. 1989-18. Passed 3-20-89.)

   (d)   Pounds of COD per billing period subject to surcharge equals: (Average concentration of COD, calculated pursuant to Chapter 923, in milligrams per liter minus normal sewage COD per liter) times the volume of wastewater discharged from the user to the wastewater treatment works per billing period, one gallon times 8.34. If the average concentration of COD is of normal sewage, or less, no surcharge for COD shall apply.

   (e)    Pounds of suspended solids per billing period subject to surcharge equals: (Average concentration of suspended solids, calculated pursuant to Chapter 923, in milligrams per liter minus normal sewage suspended solids per liter) times the volume of wastewater discharged from the user to the wastewater treatment works per billing period, in one gallon times 8.34. If the average concentration of suspended solids is of normal sewage, or less, no surcharge for suspended solids shall apply. (Ord. 1990-20. Passed 5-21-90.)

   (f)    Surcharge on user charges equals the pounds of COD calculated pursuant to Section 924.03(d) times surcharge per pound calculated pursuant to Section 924.03(b); plus pounds of suspended solids calculated pursuant to Section 924.03(e); times surcharge per pound calculated pursuant to Section 924.03(c).

   (g)    Formulas as contained in Section 924.03(b) and (c) shall be subject to adjustment as necessary based upon annual audit of sewer revenue fund expenses.

   The surcharge rates for COD and SS shall be as established in Exhibit A.

(Ord. 1989-18. Passed 3-20-89.)