(A) In addition to the regular sewage service charge, each nonresidential user discharging wastes into the community sewer shall be subject to a surcharge which is based on:
(1) The BOD and SS content of the wastes if the wastes have a concentration higher than 250 milligrams per liter of BOD or 250 milligrams per liter of SS;
(2) Concentrations of oil and grease greater than 25 milligrams per liter;
(3) Concentrations of ammonia greater than 15 milligrams per liter;
(4) Concentrations of pH less than 6.0 or greater than 9.0; or
(5) Concentrations of metals as set forth in § 52.055(D)(4) of this chapter.
(B) The discharged sewage will be sampled during each sewage bill period for a minimum one-day period, or 24 continuous hours, by means of composite samples. An extended sampling period of up to one week, or seven continuous days, or a reduction may be requested to enable the gathering of a sample representative of a business’s sewage. The extension or reduction of the period beyond the initial one-day period may be requested by either the sewer user involved or the Agency. If an extended period is requested, then the parameter values used to calculate the surcharge will be the arithmetical average of the individual values.
(1) In the event that a business or industry has multiple discharges, each discharge shall be determined by actual measurement or by means of process usage. If significant process changes are made to affect the quality of any discharge, resampling may be requested by either the sewer user involved or the Agency.
(2) The sewage sample shall be measured for the parameters set forth in division (A) above. These tests shall be made in accordance with the Standard Methods and Methods for Chemical Analysis.
(C) The excess pounds of each parameter set forth in division (A) above will be computed by multiplying the hundreds of cubic feet of metered flow during the billing period by the factor 0.006238, with 100 cubic feet of water weighing 623.8 pounds, and then multiplying the difference between the concentration measured in milligrams per liter of said parameter in the customer’s sewage and the allowed concentrations set out in § 52.055(D) of this chapter, resulting in pounds of each by the appropriate rate surcharge.
(Ord. 972, passed 2-14-1978; Ord. 2004-16, passed 1-5-2005; Ord. 2020-02, passed 6-1-2020)