(A) In addition to the base user charges and debt service charges applicable pursuant to §§ 51.157 and 51.158, users discharging pollutants to the wastewater treatment works of the village, whose average concentration, as defined in § 51.052, in one or more classifications exceeds in any month that concentration defined as normal in § 51.052 for the corresponding classification, shall be subject to surcharges calculated as follows:
(1) (a) Surcharges for each billing month during a calendar year shall be based upon the following values for that calendar year:
1. Estimated total operation and maintenance expenses pursuant to § 51.157(B)(1)(a): Cto;
2. Total debt service payments pursuant to § 51.158 (B)(1)(a): Ctd;
3. Estimated total pounds of BOD received at the plant: Bt; and
4. Estimated total pounds of suspended solids received at the plant: St.
(b) Data not available shall be established in the most practicable manner possible.
(2) Surcharge on user charges per pound of BOD in excess of normal equals:
Cto x 0.3
_________________
Bt
_________________
Bt
(3) Surcharge on user charges per pound of suspended solids in excess of normal equals:
Cto x 0.3
_________________
St
_________________
St
(4) Surcharge on debt service charges per pound of BOD in excess of normal equals:
Cto x 0.25
_________________
Bt
_________________
Bt
(5) Surcharge on debt service charges per pound of suspended solids in excess of normal equals:
Cto x 0.25
_________________
St
_________________
St
(6) Pounds of BOD per billing period subject to surcharge equals: (average concentration of BOD, calculated pursuant to § 51.050, in milligrams per liter minus 200 milligrams per liter) times volume of wastewater discharged from the user to the wastewater treatment works per billing period, in 1,000 gallons, times 0.00834. If average concentration of BOD is 200 milligrams per liter, or less, no surcharge for BOD shall apply.
(7) Pounds of suspended solids per billing period subject to surcharge equals: (average concentration of suspended solids, calculated pursuant to § 51.050, in milligrams per liter minus 240 milligrams per liter) times volume of wastewater discharged from the user to the wastewater treatment works per billing period, in 1,000 gallons, times 0.00834. If average concentration of suspended solids is 240 milligrams per liter, or less, no surcharge for suspended solids shall apply.
(8) Surcharge on user charges equals (pound of BOD calculated pursuant to division (A)(6) above) times (surcharge per pound calculated pursuant to division (A)(2) above); plus (pounds of suspended solids calculated pursuant to division (A)(7) above) times (surcharge per pound calculated pursuant to division (A)(5) above).
(9) Surcharge on debt service charges equals (pounds of BOD calculated pursuant to division (A)(6) above) times (surcharge per pound calculated pursuant to division (A)(4) above; plus pounds of suspended solids calculated pursuant to division (A)(7) above) times (surcharge per pound calculated pursuant to division (A)(3)) above).
(10) Formulas as contained in divisions (A)(2), (A)(3), (A)(4) and (A)(5) above shall be subject to adjustment as necessary, based upon annual audit of sewer revenue fund expenses.
(B) Surcharges may also be established for pollutants other than those provided for in this section which are permitted to be discharged to the wastewater treatment works by the village, after pretreatment, or without pretreatment.
(C) Surcharges levied pursuant to this section shall be billed quarterly or as otherwise established by the Village Council. The rates shall be as pursuant to § 51.161.
(Ord. 78-4, passed 2-13-1978; Ord. 92-20, passed 9-28-1992)