In addition to the base user charges applicable pursuant to Section 1045.02, users discharging pollutants to the wastewater treatment works of the City, whose average concentration, as defined in Section 1045.05, in one or more classifications, exceeds in any quarter that concentration defined as normal in Section 1045.05(a) 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:
(1) Estimated total operation, maintenance and replacement expenses (C-1);
(2) Estimated total pound of BOD received at the plant (B-1);
(3) Estimated total pounds of suspended solids received at the plant (S-1). Data not available shall be estimated in the most practical manner possible and shall be subject to periodic but not less than an annual audit;
(4) Other revenue and expense factors deemed pertinent by the Superintendent may be included in the user charge calculation.
(b) Surcharge or user charges per pound of BOD in excess of normal as defined in Section 1045.05(a) equals:
(C-1) x (.26)
B-1
(c) Surcharge on user charges per pound of suspended solids in excess of normal as defined in Section 1045.05(a) equals:
(C-1) x (.32)
S-1
(d) Pounds of BOD per billing period subject to surcharge equals: (Average concentration of BOD, calculated pursuant to Section 1045.05, in milligrams per liter minus 220 milligrams per liter) times the volume of wastewater discharged from the user to the wastewater treatment works per billing period, in 1,000 gallons times 0.00834. If the average concentration of BOD is 220 milligrams per liter, or less, no surcharge for BOD shall apply.
(e) Pounds of suspended solids per billing period subject to surcharge equals: (Average concentration of suspended solids, calculated pursuant to Section 1045.05, in milligrams per liter minus 240 milligrams per liter) times the volume of wastewater discharged from the user to the wastewater treatment works per billing period, in 1,000 gallons times 0.00834. If the average concentration of suspended solids is 240 milligrams per liter, or less, no surcharge for suspended solids shall apply.
(f) Surcharge on user charges equals pounds of BOD calculated pursuant to division (d) hereof, times surcharge per pound calculated pursuant to division (b) hereof, plus pounds of suspended solids calculated pursuant to division (e) hereof, times surcharge per pound calculated pursuant to division (c) hereof.
(g) Formulas as contained in divisions (b) and (c) hereof shall be subject to adjustment as necessary based upon an annual audit of Sewer Revenue Fund expenses.
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 City, after pretreatment, or without pretreatment.
Surcharges levied pursuant to this section shall be billed monthly or as otherwise established by the City. The sanitary sewer charges have been established by the City and are included in Section 1045.08.
(Ord. 09-119. Passed 11-17-09.)